Underwriting Agreement dated June 2, 2011

Exhibit 1.1

ARCH COAL, INC.

Common Stock

UNDERWRITING AGREEMENT

June 2, 2011

Morgan Stanley & Co. LLC
PNC Capital Markets LLC
Merrill Lynch, Pierce, Fenner & Smith Incorporated
Citigroup Global Markets Inc.

Underwriting Agreement

June 2, 2011

Morgan Stanley & Co. LLC
PNC Capital Markets LLC
Merrill Lynch, Pierce, Fenner & Smith
                Incorporated
Citigroup Global Markets Inc.

  As Representatives of the Several Underwriters

c/o		Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036

Ladies and Gentlemen:

     Introductory. Arch Coal, Inc., a Delaware corporation (the “Company”), proposes to issue and sell to the several underwriters named in Schedule A (the “Underwriters”) an aggregate of 48,000,000 shares (the “Firm Shares”) of its Common Stock, par value $0.01 per share (the “Common Stock”). In addition, the Company has granted to the Underwriters an option to purchase up to an additional 7,200,000 shares (the “Optional Shares”) of Common Stock, as provided in Section 2. The Firm Shares and, if and to the extent such option is exercised, the Optional Shares are collectively called the “Shares”. Morgan Stanley & Co. LLC (“Morgan Stanley”), PNC Capital Markets LLC, Merrill Lynch, Pierce, Fenner & Smith Incorporated and Citigroup Global Markets Inc. have agreed to act as representatives of the several Underwriters (in such capacity, the “Representatives”) in connection with the offering and sale of the Shares.

     In connection with the consummation of the Transactions (as defined herein), the Company will acquire International Coal Group, Inc., a Delaware corporation (“ICG”) (the “Merger”). The Company and its subsidiaries (including ICG and its subsidiaries) following the consummation of the Merger are collectively referred to herein as the “Combined Company”. The Shares are being issued and sold as part of the financing necessary to effect the Merger. The Merger will be effected pursuant to an Agreement and Plan of Merger, dated as of May 2, 2011 (as amended, the “Merger Agreement”), by and among the Company, Atlas Acquisition Corp. ( “Merger Sub”) and ICG. Merger Sub commenced a cash tender offer (the “Tender Offer”) for any and all of ICG’s outstanding shares of common stock. For the purposes of this Agreement, the term “Transactions” is used in the same way as such term is used in the Disclosure Package (as defined below) and means, collectively, the offering of the Shares hereby, the Merger, the Tender Offer and the related transactions described in the Disclosure Package.

     To the extent there are no additional Underwriters listed on Schedule A other than you, the terms Representatives and Underwriters as used herein shall mean you, as Underwriters. The

terms Representatives and Underwriters shall mean either the singular or plural as the context requires.

     All references in this Agreement to financial statements and schedules and other information which is “contained,” “included” or “stated” (or other references of like import) in the Registration Statement (as defined below) , the Prospectus (as defined below) or the Preliminary Prospectus (as defined below) shall be deemed to mean and include all such financial statements and schedules and other information which is or is deemed to be incorporated by reference in the Registration Statement, the Prospectus or the Preliminary Prospectus, as the case may be, prior to the Applicable Time (as defined below); and all references in this Agreement to amendments or supplements to the Registration Statement, the Prospectus or the Preliminary Prospectus shall be deemed to include the filing of any document under the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder (collectively, the “Exchange Act”), which is or is deemed to be incorporated by reference in the Registration Statement, the Prospectus or the Preliminary Prospectus, as the case may be, after the Applicable Time.

     The Company hereby confirms its agreements with the Underwriters as follows:

     Section 1. Representations and Warranties of the Company. The Company hereby represents and warrants to, and covenants with, as of the Applicable Time and as of the Closing Date (in each case, a “Representation Date”), each Underwriter as follows:

     a) Compliance with Registration and Exchange Act Requirements. The Company has prepared and filed with the Securities and Exchange Commission (the “Commission”) a registration statement on Form S-3 (File No. 333-157880), and a post-effective amendment thereto (“Post-Effective Amendment No. 1”) which contains a base prospectus (the “Base Prospectus”), to be used in connection with the public offering and sale of the Shares. Such registration statement, as amended, including the financial statements, exhibits and schedules thereto, at each time of effectiveness under the Securities Act of 1933 and the rules and regulations promulgated thereunder (collectively, the “Securities Act”), including any required information deemed to be a part thereof at the time of effectiveness pursuant to Rule 430B under the Exchange Act, is called the “Registration Statement.” Any preliminary prospectus supplement to the Base Prospectus that describes the Shares and the offering thereof and is used prior to filing of the Final Prospectus is called, together with the Base Prospectus, a “preliminary prospectus.” The term “Prospectus” shall mean the final prospectus relating to the Shares that is first filed pursuant to Rule 424(b) after the date and time that this Agreement is executed and delivered by the parties hereto (the “Execution Time”). Any reference herein to the Registration Statement, any preliminary prospectus or the Prospectus shall be deemed to refer to and include the documents incorporated by reference therein pursuant to Item 12 of Form S-3 under the Securities Act; any reference to any amendment or supplement to any preliminary prospectus or the Prospectus shall be deemed to refer to and include any documents filed after the date of such preliminary prospectus or Prospectus, as the case may be, under the Exchange Act, and incorporated by reference in such preliminary prospectus or Prospectus, as the case may be; and any reference to any amendment to the Registration Statement shall be deemed to refer to and include any annual report of the Company filed pursuant to Section 13(a) or 15(d) of the

Exchange Act after the effective date of the Registration Statement that is incorporated by reference in the Registration Statement.

     At the respective times the Registration Statement and any post-effective amendments thereto (including the filing with the Commission of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2010 (the “Annual Report on Form 10-K”)) became effective and at each Representation Date, the Registration Statement and any amendments thereto (i) complied and will comply in all material respects with the requirements of the Securities Act, and (ii) did not and will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading. At the date of the Prospectus and at the Closing Date, neither the Prospectus nor any amendments or supplements thereto included or will include an untrue statement of a material fact or omitted or will omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. Notwithstanding the foregoing, the representations and warranties in this subsection shall not apply to statements in or omissions from the Registration Statement or any post-effective amendment or the Prospectus or any amendments or supplements thereto made in reliance upon and in conformity with information furnished to the Company in writing by any of the Underwriters through Morgan Stanley expressly for use therein, it being understood and agreed that the only such information furnished by any Underwriter through Morgan Stanley consists of the information described as such in Section 8 hereof.

     Each preliminary prospectus and the Prospectus when filed complied in all material respects with the Securities Act. Each of the Registration Statement and any post-effective amendment thereto, at each time of effectiveness and at the date hereof, complied and will comply in all material respects with the Securities Act and did not and will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary in order to make the statements therein not misleading. The Prospectus, as amended or supplemented, as of its date, at the date hereof, at the time of any filing pursuant to Rule 424(b) under the Securities Act, at the Closing Date (as defined herein) and at any Subsequent Closing Date (as defined herein), did not and will not contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. The representations and warranties set forth in the two immediately preceding sentences do not apply to statements in or omissions from the Registration Statement or any post-effective amendment thereto, or the Prospectus, or any amendments or supplements thereto, based upon and in conformity with information furnished to the Company in writing by any Underwriter through Morgan Stanley expressly for use therein, it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in Section 8 hereof. There is no contract or other document required to be described in the Prospectus or to be filed as an exhibit to the Registration Statement that has not been described or filed as required.

     b) Incorporated Documents. The documents incorporated or deemed to be incorporated by reference in the Registration Statement, the Preliminary Prospectus and the Prospectus (i) at the time they were or hereafter are filed with the Commission, complied or will comply in all material respects with the requirements of the Exchange Act and (ii) when read together with the other information in the Disclosure Package, at the Applicable Time, and when

read together with the other information in the Prospectus, at the date of the Prospectus and at the Closing Date, did not or will not include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

     c) Disclosure Package. The term “Disclosure Package” shall mean (i) the Base Prospectus, including any preliminary prospectus supplement, as amended or supplemented, (ii) the issuer free writing prospectuses as defined in Rule 433 under the Securities Act (each, an “Issuer Free Writing Prospectus”), if any, identified in Schedule C hereto, (iii) any other free writing prospectus that the parties hereto shall hereafter expressly agree in writing to treat as part of the Disclosure Package and (iv) a schedule indicating the number of Shares being sold and the price at which the Shares will be sold to the public. As of 7:30 p.m. (New York time) on the date of execution and delivery of this Agreement (the “Applicable Time”), the Disclosure Package did not contain any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. The preceding sentence does not apply to statements in or omissions from the Disclosure Package based upon and in conformity with written information furnished to the Company by any Underwriter through Morgan Stanley expressly for use therein, it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in Section 8 hereof.

     d) Company is a Well-Known Seasoned Issuer. (i) At the time of filing the Registration Statement, (ii) at the time of the most recent amendment thereto for the purposes of complying with Section 10(a)(3) of the Securities Act (whether such amendment was by post-effective amendment, incorporated report filed pursuant to Section 13 or 15(d) of the Exchange Act or form of prospectus), (iii) at the time the Company or any person acting on its behalf (within the meaning, for this clause only, of Rule 163(c) of the Securities Act) made any offer relating to the Shares in reliance on the exemption of Rule 163 of the Securities Act, and (iv) as of the Execution Time, the Company was and is a “well known seasoned issuer” as defined in Rule 405 of the Securities Act. The Registration Statement is an “automatic shelf registration statement,” as defined in Rule 405 of the Securities Act, that automatically became effective not more than three years prior to the Execution Time; the Company has not received from the Commission any notice pursuant to Rule 401(g)(2) of the Securities Act objecting to use of the automatic shelf registration statement form and the Company has not otherwise ceased to be eligible to use the automatic shelf registration form.

     e) Company is not an Ineligible Issuer. (i) At the earliest time after the filing of the Registration Statement when a bona fide offer (as used in Rule 164(h)(2) of the Securities Act) of the Shares is first made available by the Company or any other offering participant, and (ii) as of the Execution Time (with such date being used as the determination date for purposes of this clause (ii)), the Company was not and is not an Ineligible Issuer (as defined in Rule 405 of the Securities Act), without taking account of any determination by the Commission pursuant to Rule 405 of the Securities Act that it is not necessary that the Company be considered an Ineligible Issuer.

     f) Issuer Free Writing Prospectuses. Each Issuer Free Writing Prospectus, as of its issue date and at all subsequent times through the completion of the public offering and sale of

the Shares under this Agreement or until any earlier date that the Company notified or notifies Morgan Stanley as described in the next sentence, did not, does not and will not include any information that conflicted, conflicts or will conflict with the information contained in the Registration Statement, including any prospectus or prospectus supplement that is or becomes part of the Registration Statement. If at any time following issuance of an Issuer Free Writing Prospectus there occurred or occurs an event or development as a result of which such Issuer Free Writing Prospectus conflicted or would conflict with the information contained in the Registration Statement, the Preliminary Prospectus or the Prospectus, the Company has promptly notified or will promptly notify Morgan Stanley and has promptly amended or supplemented or will promptly amend or supplement, at its own expense, such Issuer Free Writing Prospectus to eliminate or correct such conflict. The foregoing two sentences do not apply to statements in or omissions from any Issuer Free Writing Prospectus based upon and in conformity with information furnished to the Company in writing by any Underwriter through Morgan Stanley specifically for use therein, it being understood and agreed that the only such information furnished by any Underwriter through Morgan Stanley consists of the information described as such in Section 8 hereof.

     g) Distribution of Offering Material By the Company. The Company has not distributed and will not distribute, prior to the later of the last Subsequent Closing Date (as defined below) and the completion of the Underwriters’ distribution of the Shares, any offering material in connection with the offering and sale of the Shares other than a preliminary prospectus, the Prospectus or any Issuer Free Writing Prospectus reviewed and consented to by Morgan Stanley or included in Schedule C hereto or the Registration Statement.

     h) The Underwriting Agreement. This Agreement has been duly authorized, executed and delivered by, and constitutes a valid and binding agreement of, the Company, enforceable against the Company in accordance with its terms, except as rights to indemnification hereunder may be limited by applicable law and except as the enforcement hereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors generally or by general equitable principles (regardless of whether enforcement is considered in a proceeding at law or in equity).

     i) Authorization of the Shares. The Shares to be purchased by the Underwriters from the Company have been duly authorized for issuance and sale pursuant to this Agreement and, when issued and delivered by the Company to the Underwriters pursuant to this Agreement on the Closing Date or any Subsequent Closing Date, will be validly issued, fully paid and nonassessable, and the issuance of such Shares will not be subject to any preemptive or similar rights.

     j) No Transfer Taxes. There are no transfer taxes or other similar fees or charges under federal law, the laws of any state, or any political subdivision thereof, or any other U.S. or non-U.S. governmental authority required to be paid in connection with the execution and delivery of this Agreement or the issuance by the Company or sale by the Company of the Shares.

     k) No Applicable Registration or Other Similar Rights. There are no persons with registration or other similar rights to have any equity or debt securities registered for sale under

the Registration Statement or included in the offering contemplated by this Agreement, except for such rights as have been duly waived.

     l) No Material Adverse Effect. Since the date as of which information is given in the Disclosure Package and the Prospectus, except as otherwise stated therein, (i) there has been no change having a material adverse effect in the condition, financial or otherwise, or in the earnings, properties, business or prospects of the Company and its subsidiaries, taken as a whole (an “Arch Coal Material Adverse Effect”), (ii) there have been no transactions entered into by the Company and its subsidiaries, other than those arising in the ordinary course of business, which are material with respect to the Company and its subsidiaries, taken as a whole, and (iii) except for regular quarterly dividends on the Company’s common stock, in amounts per share that are consistent with past practice, there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock. A change that would reasonably be expected to have a material adverse effect in the condition, financial or otherwise, or in the earnings, properties, business or prospects of the Combined Company and its subsidiaries, taken as a whole is referred to herein as a “Combined Company Material Adverse Effect”.

     m) Independent Accountants of the Company. Ernst & Young LLP, which expressed its opinion with respect to the audited financial statements of the Company and its consolidated subsidiaries and delivered its reports with respect to the audited consolidated financial statements and schedules of the Company for the fiscal years ended 2008, 2009 and 2010 included or incorporated by reference in the Disclosure Package and the Prospectus, are independent public accountants with respect to the Company within the meaning of the Securities Act and the Exchange Act and are a registered public accounting firm with the Public Company Accounting Oversight Board.

     n) Independent Accountants of ICG. Deloitte & Touche LLP, which expressed its opinion with respect to the audited financial statements of ICG and its consolidated subsidiaries and delivered its reports with respect to the audited consolidated financial statements and schedules of the Company for the fiscal years ended 2008, 2009 and 2010 included or incorporated by reference in the Disclosure Package and the Prospectus, are independent public accountants with respect to ICG within the meaning of the Securities Act and the Exchange Act and are a registered public accounting firm with the Public Company Accounting Oversight Board.

     o) Preparation of the Financial Statements. (i) The consolidated historical financial statements, together with the related schedules and notes, of the Company and its consolidated subsidiaries included in the Disclosure Package and the Prospectus present fairly in all material respects, the consolidated financial position, results of operations and cash flows of the Company as of the dates and for the periods indicated, comply as to form with the applicable accounting requirements of the Securities Act and have been prepared in conformity with generally accepted accounting principles in the United States applied on a consistent basis throughout the periods involved (except as otherwise noted therein), (ii) the selected financial data set forth under the caption “Selected Historical Financial Data of Arch Coal” in the Disclosure Package and the Prospectus fairly present, on the basis stated in the Disclosure Package and the Prospectus, the information included therein, and (iii) the unaudited pro forma financial information and related

notes of the Company and its subsidiaries contained in the Disclosure Package and the Prospectus have been prepared in accordance with the Commission’s rules and guidance and have been properly presented on the bases described therein, and give effect to assumptions used in the preparation thereof, are on a reasonable basis and in good faith and the adjustments used therein are appropriate to give effect to the transactions and circumstances referred to therein. To the knowledge of the Company, ICG’s consolidated historical financial statements, together with the related notes, of ICG and its consolidated subsidiaries included in the Disclosure Package and the Prospectus present fairly in all material respects, the consolidated financial position, results of operations and cash flows of ICG as of the dates and for the periods indicated, comply as to form with the applicable accounting requirements of the Securities Act and have been prepared in conformity with generally accepted accounting principles in the United States applied on a consistent basis throughout the periods involved (except as otherwise noted therein).

     p) Incorporation and Good Standing of the Company. The Company has been duly incorporated and is validly existing as a corporation in good standing under the laws of the State of Delaware and has power and authority to own, lease and operate its properties and to conduct its business as described in the Disclosure Package and the Prospectus and to enter into and perform its obligations under, or as contemplated under, this Agreement. The Company is duly qualified as a foreign corporation to transact business and is in good standing or equivalent status in each other jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure to so qualify or be in good standing would not result in an Arch Coal Material Adverse Effect.

     q) Capitalization and Other Capital Stock Matters. The authorized and outstanding capitalization of the Company on an actual basis as of March 31, 2011 is as set forth in the column entitled “Actual” under the caption “Capitalization” in the Disclosure Package and the Prospectus (except for subsequent issuances, if any, pursuant to reservations, agreements or employee benefit plans referred to or incorporated by reference in the Disclosure Package and the Prospectus or pursuant to the exercise of convertible securities or options referred to or included in the Disclosure Package and the Prospectus). The Common Stock (including the Shares) conforms in all material respects to the description thereof contained in the Disclosure Package and the Prospectus. All of the issued and outstanding shares of Common Stock have been duly authorized and validly issued, are fully paid and nonassessable and have been issued in compliance with federal and state securities laws. None of the outstanding shares of Common Stock were issued in violation of any preemptive rights, rights of first refusal or other similar rights to subscribe for or purchase securities of the Company. There are no authorized or outstanding options, warrants, preemptive rights, rights of first refusal or other rights to purchase, or equity or debt securities convertible into or exchangeable or exercisable for, any capital stock of the Company or any of its subsidiaries other than those described in the Disclosure Package and the Prospectus. The description of the Company’s stock option, stock bonus and other stock plans or arrangements, and the options or other rights granted thereunder, set forth or incorporated by reference in the Disclosure Package and the Prospectus accurately and fairly present and summarize such plans, arrangements, options and rights.

     r) Coal Reserve Information of the Company. All information related to the coal reserves of the Company and its subsidiaries (including, without limitation, each of the Company’s (x) estimated assigned and unassigned recoverable coal reserves and (y) proven,

probable and total recoverable coal reserves, in the aggregate and by region and mining complex location) included in the Disclosure Package and the Prospectus (the “Coal Reserve Information”), (i) was and is accurate in all material respects, (ii) complies in all material respects with the requirements of the Securities Act and the requirements of the Exchange Act, as applicable, and (iii) when read together with the other information in the Disclosure Package and the Prospectus, did not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading. The Coal Reserve Information has been calculated in accordance with standard mining engineering procedures used in the coal industry and applicable government reporting requirements and applicable law. All assumptions used in the calculation of the Coal Reserve Information were and are reasonable.

     s) Coal Reserve Information of ICG. All information related to the coal reserves of ICG and its subsidiaries (including, without limitation, each of the ICG’s (x) estimated assigned and unassigned recoverable coal reserves and (y) proven, probable and total recoverable coal reserves, in the aggregate and by region and mining complex location) included in the Disclosure Package and the Prospectus (the “ICG Coal Reserve Information”), to the knowledge of the Company (i) was and is accurate in all material respects, (ii) complies in all material respects with the requirements of the Securities Act and the requirements of the Exchange Act, as applicable, and (iii) when read together with the other information in the Disclosure Package and the Prospectus, did not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading. The ICG Coal Reserve Information has, to the knowledge of the Company, been calculated in accordance with standard mining engineering procedures used in the coal industry and applicable government reporting requirements and applicable law. To the knowledge of the Company, all assumptions used in the calculation of the ICG Coal Reserve Information were and are reasonable.

     t) Subsidiaries of the Company and ICG. Each subsidiary of the Company, and, to the knowledge of the Company, ICG and each of ICG’s subsidiaries has been duly organized and is validly existing as a corporation, limited liability company or partnership, as applicable, in good standing under the laws of the jurisdiction of its formation, has power and authority to own, lease and operate its properties and to conduct its business as described in the Disclosure Package and the Prospectus and is duly qualified to transact business and is in good standing in each other jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure to so qualify or be in good standing would not result in an Arch Coal Material Adverse Effect in the case of the Company or a Combined Company Material Adverse Effect in the case of the Combined Company. Except as otherwise stated in the Disclosure Package and the Prospectus, all of the issued and outstanding capital stock or other ownership interests of each subsidiary of the Company has been duly authorized and validly issued, fully paid and non-assessable and is owned by the Company, directly or through subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance, claim or equity. Except as otherwise stated in the Disclosure Package and the Prospectus, none of the outstanding shares of capital stock of any subsidiary of the Company was issued in violation of preemptive or other similar rights of any securityholder of such subsidiary of the Company.

     u) Listing. The Shares have been approved for listing on the New York Stock Exchange (“NYSE”), subject only to official notice of issuance.

     v) Compliance with Reporting Requirements. The Company is subject to and in full compliance with the reporting requirements of Section 13 or Section 15(d) of the Exchange Act.

     w) Non-Contravention of Existing Instruments; No Further Authorizations or Approvals Required. None of the Company or any of its subsidiaries, or, to the knowledge of the Company, ICG or any of its subdisiaries, is in violation of its charter, by-laws or other organizational documents or in default in the performance or observance of any obligation, agreement, covenant or condition contained in any contract, indenture, mortgage, deed of trust, loan or credit agreement, note, lease or other agreement or instrument to which the Company or any of its subsidiaries or ICG or any of its subsidiaries, as applicable, is a party or by which it or any of them may be bound, or to which any of the assets, properties or operations of the Company or any of its subsidiaries or ICG or any of its subsidiaries, as applicable, is subject (collectively, “Agreements and Instruments”), except for such defaults that would not result in an Arch Coal Material Adverse Effect in the case of the Company, or a Combined Company Material Adverse Effect in the case of the Combined Company. The execution, delivery and performance of this Agreement or the Merger Agreement and any other agreement or instrument entered into or issued or to be entered into or issued by the Company in connection with the transactions contemplated hereby or thereby or in the Disclosure Package and the Prospectus and the consummation of the transactions contemplated herein and in the Disclosure Package and the Prospectus (including the issuance and sale of the Shares and the use of the proceeds from the sale of the Shares as described under the caption “Use of Proceeds” in the Disclosure Package and the Prospectus) and compliance by the Company with its obligations hereunder and thereunder have been duly authorized by all necessary corporate action and do not and will not, whether with or without the giving of notice or passage of time or both, conflict with or constitute a breach of, or default or any event or condition which gives the holder of any note, debenture or other evidence of indebtedness (or any person acting on such holder’s behalf) the right to require the repurchase, redemption or repayment of all or a portion of such indebtedness by the Company or any of its subsidiaries, except for such events or conditions contemplated as part of the transactions described under the caption “The Transactions” in the Disclosure Package and the Prospectus (each such event or condition, a “Repayment Event”) under, or result in the creation or imposition of any lien, charge or encumbrance upon any assets, properties or operations of the Company or any of its subsidiaries pursuant to, any Agreements and Instruments (except for such conflicts, breaches or defaults or liens, charges or encumbrances that would not result in an Arch Coal Material Adverse Effect in the case of the Company and in a Combined Company Material Adverse Effect in the case of the Combined Company), nor will such action result in any violation of the provisions of the charter, by-laws or other organizational documents of the Company or any of its subsidiaries or any applicable law, statute, rule, regulation, judgment, order, writ or decree of any government, government instrumentality or court, domestic or foreign, having jurisdiction over the Company or any of its subsidiaries or any of their assets, properties or operations.

     x) Absence of Arch Coal Labor Disputes. No labor dispute with the employees of the Company or any of its subsidiaries exists or, to the knowledge of the Company, is imminent, and the Company is not aware of any existing or imminent labor disturbance by the employees of

any of its or any subsidiary’s principal suppliers, manufacturers, customers or contractors, which, in either case, may reasonably be expected to result in an Arch Coal Material Adverse Effect.

     y) Absence of ICG Labor Disputes. To the knowledge of the Company, no labor dispute with the employees of ICG or any of its subsidiaries exists or, to the knowledge of the Company, is imminent, and the Company is not aware of any existing or imminent labor disturbance by the employees of any of ICG’s or any of ICG’s subsidiary’s principal suppliers, manufacturers, customers or contractors, which, in either case, may reasonably be expected to result in a Combined Company Material Adverse Effect.

     z) No Material Actions or Proceedings. Except as otherwise disclosed in the Disclosure Package and the Prospectus (including, without limitation in the notes to the ICG financials included and incorporated by reference), there is no action, suit, proceeding, inquiry or investigation before or brought by any court or governmental agency or body, domestic or foreign, now pending, or, to the knowledge of the Company, threatened, against or affecting the Company or any of its subsidiaries or ICG or its subsidiaries, which might reasonably be expected to result in an Arch Coal Material Adverse Effect in the case of the Company or a Combined Company Material Adverse Effect in the case of the Combined Company, or which might reasonably be expected to materially and adversely affect the assets, properties or operations thereof or the consummation of the transactions contemplated under the Disclosure Package and the Prospectus, this Agreement or the performance by the Company of its obligations hereunder and thereunder. The aggregate of all pending legal or governmental proceedings to which the Company or any of its subsidiaries and ICG and its subsidiaries is a party or of which any of their respective assets, properties or operations is subject which are not described in the Disclosure Package and the Prospectus, including ordinary routine litigation incidental to the business, could not reasonably be expected to result in an Arch Coal Material Adverse Effect in the case of Arch Coal or in a Combined Company Material Adverse Effect in the case of the Combined Company.

     aa) No Consents or Approvals, etc. Except as otherwise disclosed in the Disclosure Package and the Prospectus, no filing with, or authorization, approval, consent, license, order, registration, qualification or decree of, any court or governmental authority or agency, domestic or foreign, is necessary or required for the due authorization, execution and delivery by the Company of this Agreement in connection with the issuance of the Shares or for the performance by the Company of the transactions contemplated under the Disclosure Package and the Prospectus or this Agreement or the Merger Agreement, except such as have been already made, obtained or rendered, and such as will be obtained under the Securities Act and such as may be required by the Financial Industry Regulatory Authority (“FINRA”) and under blue sky laws of any jurisdiction in connection with the purchase and sale by the Underwriters in the manner contemplated herein and in the Disclosure Package and the Prospectus, as applicable, as of the Closing Date.

     bb) Intellectual Property Rights. The Company and its subsidiaries and, to the knowledge of the Company, ICG and its subsidiaries, own or possess, or can acquire on reasonable terms, adequate patents, patent rights, licenses, inventions, copyrights, know-how (including trade secrets and other unpatented and/or unpatentable proprietary or confidential information, systems or procedures), trademarks, service marks, trade names or other intellectual

property (collectively, “Intellectual Property”) necessary to carry on their respective businesses as currently conducted or as proposed to be conducted. Neither the Company nor any of its subsidiaries has received any notice or is otherwise aware of any infringement of or conflict with asserted rights of others with respect to any Intellectual Property or of any facts or circumstances which would render any Intellectual Property invalid or inadequate to protect the interest of the Company or any of its subsidiaries therein or, to the knowledge of the Company, ICG or its subsidiaries, and which infringement or conflict (if the subject of any unfavorable decision, ruling or finding) or invalidity or inadequacy, singly or in the aggregate, would result in an Arch Coal Material Adverse Effect in the case of the Company and a Combined Company Material Adverse Effect in the case of the Combined Company.

     cc) All Necessary Permits, etc. The Company and its subsidiaries possess such permits, licenses, approvals, consents and other authorizations (collectively, the “Arch Coal Governmental Licenses”) issued by the appropriate federal, state, local or foreign regulatory agencies or bodies necessary to conduct the business now operated by them. To the knowledge of the Company, ICG and its subsidiaries possess such permits, licenses, approvals, consents and other authorizations (collectively, the “ICG Governmental Licenses”) issued by the appropriate federal, state, local or foreign regulatory agencies or bodies necessary to conduct the business now operated by them. The Company and its subsidiaries are in compliance with the terms and conditions of all such Arch Governmental Licenses, except where the failure so to comply would not, singly or in the aggregate, result in an Arch Coal Material Adverse Effect. To the knowledge of the Company, ICG and its subsidiaries are in compliance with the terms and conditions of all such ICG Governmental Licenses, except where the failure so to comply would not, singly or in the aggregate, together with any failure contemplated in the immediately prior sentence, result in a Combined Company Material Adverse Effect. All of the Arch Coal Governmental Licenses and, to the knowledge of the Company, all of the ICG Governmental Licenses, are valid and in full force and effect, except where the invalidity of such Arch Coal Governmental Licenses and ICG Governmental Licenses or the failure of such Arch Coal Governmental Licenses and ICG Governmental Licenses to be in full force and effect would not result in an Arch Coal Material Adverse Effect in the case of the Company or a Combined Company Material Adverse Effect in the case of the Combined Company. Except as otherwise disclosed in the Disclosure Package and the Prospectus, neither the Company nor any of its subsidiaries nor, to the knowledge of the Company, ICG nor any of its subsidiaries, has received any notice of proceedings relating to the revocation or modification of any such Governmental Licenses which, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would result in an Arch Coal Material Adverse Effect in the case of the Company or in a Combined Company Material Adverse Effect in the case of the Combined Company.

     dd) Title to Properties of the Company. The Company and its subsidiaries have good and marketable title to all real property owned by the Company and its subsidiaries and good title to all other properties owned by them, in each case, free and clear of all mortgages, pledges, liens, security interests, claims, restrictions or encumbrances of any kind, except (i) as otherwise stated in the Disclosure Package and the Prospectus or (ii) those which do not in the aggregate, materially affect the value of such property and do not interfere with the use made and proposed to be made of such property by the Company or any of its subsidiaries. All of the leases and subleases material to the business of the Company and its subsidiaries, taken as a whole, and under which the Company or any of its subsidiaries holds properties described in the Disclosure

Package and the Prospectus, are in full force and effect, and neither the Company nor any of its subsidiaries has received any notice of any material claim of any sort that has been asserted by anyone adverse to the rights of the Company or any of its subsidiaries under any of the leases or subleases mentioned above, or affecting or questioning the rights of the Company or such subsidiary of the continued possession of the leased or subleased premises under any such lease or sublease.

     ee) Title to Properties of ICG. To the knowledge of the Company, ICG and its subsidiaries have good and marketable title to all real property owned by ICG and its subsidiaries and good title to all other properties owned by them, in each case, free and clear of all mortgages, pledges, liens, security interests, claims, restrictions or encumbrances of any kind, except (i) as otherwise stated in the Disclosure Package and the Prospectus or (ii) those which do not singly or in the aggregate, materially affect the value of such property and do not interfere with the use made and proposed to be made of such property by ICG or any of its subsidiaries. To knowledge of the Company, all of the leases and subleases material to the business of the ICG and its subsidiaries, taken as a whole, and under which ICG or any of its subsidiaries holds properties described in the Disclosure Package and the Prospectus, are in full force and effect, and, to the knowledge of the Company, neither ICG nor any of its subsidiaries has received any notice of any material claim of any sort that has been asserted by anyone adverse to the rights of the ICG or any of its subsidiaries under any of the leases or subleases mentioned above, or affecting or questioning the rights of the ICG or such subsidiary of the continued possession of the leased or subleased premises under any such lease or sublease.

     ff) Tax Law Compliance. (i) Each of the Company and its subsidiaries has filed all foreign, federal, state and local tax returns that are required to be filed or has requested extensions thereof except in any case in which the failure so to file would not have an Arch Coal Material Adverse Effect and except as set forth in or contemplated in the Disclosure Package and the Prospectus (exclusive of any amendment or supplement thereto) and has paid all taxes required to be paid by it and any other assessment, fine or penalty levied against it, to the extent that any of the foregoing is due and payable, except for any such assessment, fine or penalty that is currently being contested in good faith or as would not have an Arch Coal Material Adverse Effect and except as set forth in or contemplated in the Disclosure Package and the Prospectus (exclusive of any amendment or supplement thereto); and (ii) to the knowledge of the Company, each of ICG and its subsidiaries has filed all foreign, federal, state and local tax returns that are required to be filed or has requested extensions thereof except in any case in which the failure so to file would not have a Combined Company Material Adverse Effect and except as set forth in or contemplated in the Disclosure Package and the Prospectus (exclusive of any amendment or supplement thereto) and has paid all taxes required to be paid by it and any other assessment, fine or penalty levied against it, to the extent that any of the foregoing is due and payable, except for any such assessment, fine or penalty that is currently being contested in good faith or as would not have a Combined Company Material Adverse Effect and except as set forth in or contemplated in the Disclosure Package and the Prospectus (exclusive of any amendment or supplement thereto).

     gg) Company Not an “Investment Company”. The Company has been advised of the rules and requirements under the Investment Company Act of 1940, as amended (the “Investment Company Act,” which term, as used herein, includes the rules and regulations of

the Commission promulgated thereunder). The Company is not, and after receipt of payment for the Shares and the application of the net proceeds in the manner described under the caption “Use of Proceeds” in the Disclosure Package and the Prospectus will not be, an “investment company” within the meaning of the Investment Company Act and will conduct its business in a manner so that it will not become subject to the Investment Company Act.

     hh) Insurance of the Company. The Company and each of its subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as are prudent and customary in the businesses in which they are engaged; all policies of insurance and fidelity or surety bonds insuring the Company, or any of its subsidiaries or their respective businesses, assets, employees, officers and directors are in full force and effect; the Company and its subsidiaries are in compliance with the terms of such policies and instruments in all material respects; and there are no claims by the Company or any of its subsidiaries under any such policy or instrument as to which any insurance company is denying liability or defending under a reservation of rights clause; neither the Company nor any such subsidiary has been refused any insurance coverage sought or applied for; and neither the Company nor any such subsidiary has any reason to believe that it will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business at a cost that would not have an Arch Coal Material Adverse Effect, except as set forth in or contemplated in the Disclosure Package and the Prospectus (exclusive of any amendment or supplement thereto).

     ii) Insurance of ICG. To the knowledge of the Company, ICG and each of its subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as are prudent and customary in the businesses in which they are engaged; to the knowledge of the Company, all policies of insurance and fidelity or surety bonds insuring ICG, or any of its subsidiaries or their respective businesses, assets, employees, officers and directors are in full force and effect; to the knowledge of the Company, ICG and its subsidiaries are in compliance with the terms of such policies and instruments in all material respects; and to the knowledge of the Company, there are no claims by ICG or any of its subsidiaries under any such policy or instrument as to which any insurance company is denying liability or defending under a reservation of rights clause; to the knowledge of the Company, neither ICG nor any such subsidiary has been refused any insurance coverage sought or applied for; and, to the knowledge of the Company, neither ICG nor any such subsidiary has any reason to believe that it will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business at a cost that would not have a Combined Company Material Adverse Effect, except as set forth in or contemplated in the Disclosure Package and the Prospectus (exclusive of any amendment or supplement thereto).

     jj) No Price Stabilization or Manipulation. None of the Company or any of its subsidiaries has taken or will take, directly or indirectly, any action designed to or that might reasonably be expected to cause or result in stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Shares.

     kk) Compliance with Sarbanes-Oxley by the Company. The Company and its subsidiaries and their respective officers and directors are in compliance in all material respects

with the applicable provisions of the Sarbanes-Oxley Act of 2002 (the “Sarbanes-Oxley Act,” which term, as used herein, includes the rules and regulations of the Commission promulgated thereunder).

     ll) Compliance with Sarbanes-Oxley by ICG. To the knowledge of the Company. ICG and its subsidiaries and their respective officers and directors are in compliance in all material respects with the applicable provisions of the Sarbanes-Oxley Act.

     mm) Company’s Accounting System. The Company and its subsidiaries maintain a system of accounting controls that is in compliance in all material respects with the Sarbanes-Oxley Act and is sufficient to provide reasonable assurances that: (i) transactions are executed in accordance with management’s general or specific authorization; (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with generally accepted accounting principles as applied in the United States and to maintain accountability for assets; (iii) access to assets is permitted only in accordance with management’s general or specific authorization; and (iv) the recorded accountability for assets is compared with existing assets at reasonable intervals and appropriate action is taken with respect to any differences.

     nn) ICG’s Accounting System. To the knowledge of the Company, ICG and its subsidiaries maintain a system of accounting controls that is in compliance in all material respects with the Sarbanes-Oxley Act and is sufficient to provide reasonable assurances that: (i) transactions are executed in accordance with management’s general or specific authorization; (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with generally accepted accounting principles as applied in the United States and to maintain accountability for assets; (iii) access to assets is permitted only in accordance with management’s general or specific authorization; and (iv) the recorded accountability for assets is compared with existing assets at reasonable intervals and appropriate action is taken with respect to any differences.

     oo) The Company’s Disclosure Controls and Procedures. The Company has established and maintains disclosure controls and procedures (as such term is defined in Rules 13a-15 and 15d-14 under the Exchange Act); such disclosure controls and procedures are designed to ensure that material information relating to the Company and its subsidiaries is made known to the chief executive officer and chief financial officer of the Company by others within the Company or any of its subsidiaries, and such disclosure controls and procedures are reasonably effective to perform the functions for which they were established subject to the limitations of any such control system; the Company’s auditors and the Audit Committee of the Board of Directors of the Company have been advised of: (i) any significant deficiencies or material weaknesses in the design or operation of internal controls which could adversely affect the Company’s ability to record, process, summarize, and report financial data; and (ii) any fraud, whether or not material, that involves management or other employees who have a role in the Company’s internal controls; and since the date of the most recent evaluation of such disclosure controls and procedures, there have been no significant changes in internal controls or in other factors that could significantly and adversely affect internal controls, including any corrective actions with regard to significant deficiencies and material weaknesses.

     pp) ICG’s Disclosure Controls and Procedures. To the knowledge of the Company, ICG has established and maintains disclosure controls and procedures (as such term is defined in Rules 13a-15 and 15d-14 under the Exchange Act); to the knowledge of the Company, such disclosure controls and procedures are designed to ensure that material information relating to ICG and its subsidiaries is made known to the chief executive officer and chief financial officer of ICG by others within ICG or any of its subsidiaries, and such disclosure controls and procedures are reasonably effective to perform the functions for which they were established subject to the limitations of any such control system; to the knowledge of the Company, ICG’s auditors and the Audit Committee of the Board of Directors of ICG have been advised of: (i) any significant deficiencies or material weaknesses in the design or operation of internal controls which could adversely affect ICG’s ability to record, process, summarize, and report financial data; and (ii) any fraud, whether or not material, that involves management or other employees who have a role in ICG’s internal controls; and, to the knowledge of the Company, since the date of the most recent evaluation of such disclosure controls and procedures, there have been no significant changes in internal controls or in other factors that could significantly and adversely affect internal controls, including any corrective actions with regard to significant deficiencies and material weaknesses.

     qq) Compliance with Environmental Laws by the Company. Except as otherwise stated in the Disclosure Package and the Prospectus and except as would not, singly or in the aggregate, result in an Arch Coal Material Adverse Effect, (i) neither the Company nor any of its subsidiaries is in violation of any federal, state, local or foreign statute, law, rule, regulation, ordinance, code, policy or rule of common law or any judicial or administrative interpretation thereof including any judicial or administrative order, consent, decree or judgment, relating to pollution or protection of human health, the environment (including, without limitation, ambient air, surface water, groundwater, land surface or subsurface strata) or wildlife, including, without limitation, laws and regulations relating to the release or threatened release of chemicals, pollutants, contaminants, wastes, toxic substances, hazardous substances, petroleum or petroleum products (collectively, “Hazardous Materials”) or to the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of Hazardous Materials (collectively, “Environmental Laws”), (ii) neither the Company nor any of its subsidiaries fails to possess any permit, authorization or approval required under any applicable Environmental Laws or to be in compliance with their requirements, (iii) there are no pending or threatened administrative, regulatory or judicial actions, suits, demands, demand letters, claims, liens, notices of noncompliance or violations, investigations or proceedings relating to any Environmental Law against the Company or any of its subsidiaries and (iv) there are no events or circumstances that might reasonably be expected to form the basis of an order for clean-up or remediation, or an action, suit or proceeding by any private party or governmental body or agency, against or affecting the Company or any of its subsidiaries relating to Hazardous Materials or any Environmental Laws.

     rr) Compliance with Environmental Laws by ICG. To the knowledge of the Company, except as otherwise stated in the Disclosure Package and the Prospectus (including, without limitation in the notes to the ICG financials included and incorporated by reference) and except as would not, singly or in the aggregate, result in a Combined Company Material Adverse Effect, (i) neither ICG nor any of its subsidiaries is in violation of any Environmental Laws, (ii) neither ICG nor any of its subsidiaries fails to possess any permit, authorization or approval

required under any applicable Environmental Laws or to be in compliance with their requirements, (iii) there are no pending or threatened administrative, regulatory or judicial actions, suits, demands, demand letters, claims, liens, notices of noncompliance or violations, investigations or proceedings relating to any Environmental Law against ICG or any of its subsidiaries and (iv) there are no events or circumstances that might reasonably be expected to form the basis of an order for clean-up or remediation, or an action, suit or proceeding by any private party or governmental body or agency, against or affecting ICG or any of its subsidiaries relating to Hazardous Materials or any Environmental Laws.

     ss) Stamp Taxes. There are no stamp or other issuance or transfer taxes or duties or other similar fees or charges under federal law or the laws of any state, or any political subdivision thereof, required to be paid in connection with the execution and delivery of this Agreement or the issuance or sale by the Company of the Shares.

     tt) ERISA Compliance by the Company. Each of the Company and its subsidiaries has fulfilled its obligations, if any, under the minimum funding standards of Section 302 of the United States Employee Retirement Income Security Act of 1974, as amended (“ERISA”), and the regulations and published interpretations thereunder with respect to each “plan” (as defined in Section 3(3) of ERISA and such regulations and published interpretations) in which employees of the Company and its subsidiaries are eligible to participate and each such plan is in compliance in all material respects with the presently applicable provisions of ERISA and such regulations and published interpretations; the Company and its subsidiaries have not incurred any unpaid liability to the Pension Benefit Guaranty Corporation (other than for the payment of premiums in the ordinary course) or to any such plan under Title IV of ERISA.

     uu) ERISA Compliance by ICG. To the knowledge of the Company, each of ICG and its subsidiaries has fulfilled its obligations, if any, under the minimum funding standards of Section 302 of ERISA, and the regulations and published interpretations thereunder with respect to each “plan” (as defined in Section 3(3) of ERISA and such regulations and published interpretations) in which employees of ICG and its subsidiaries are eligible to participate and each such plan is in compliance in all material respects with the presently applicable provisions of ERISA and such regulations and published interpretations; ICG and its subsidiaries have not incurred any unpaid liability to the Pension Benefit Guaranty Corporation (other than for the payment of premiums in the ordinary course) or to any such plan under Title IV of ERISA.

     vv) Related Party Transactions of the Company. No relationship, direct or indirect, exists between or among any of the Company or any affiliate of the Company, on the one hand, and any director, officer, member, stockholder, customer or supplier of the Company or any affiliate of the Company, on the other hand, which is required by the Securities Act to be disclosed in the Disclosure Package and the Prospectus which is not so disclosed. There are no outstanding loans, advances (except advances for business expenses in the ordinary course of business) or guarantees of indebtedness by the Company or any affiliate of the Company to or for the benefit of any of the officers or directors of the Company or any affiliate of the Company or any of their respective family members.

     ww) Related Party Transactions of ICG. To the knowledge of the Company, except as otherwise disclosed in ICG’s Definitive Proxy Statement on Schedule 14A filed with the

Commision on April 15, 2011, no relationship, direct or indirect, exists between or among any of ICG or any affiliate of ICG, on the one hand, and any director, officer, member, stockholder, customer or supplier of ICG or any affiliate of ICG, on the other hand, which is required to be disclosed and is not so disclosed. To the knowledge of the Company, there are no outstanding loans, advances (except advances for business expenses in the ordinary course of business) or guarantees of indebtedness by ICG or any affiliate of ICG to or for the benefit of any of the officers or directors of ICG or any affiliate of ICH or any of their respective family members.

     xx) No Restrictions on Dividends. No subsidiary of the Company is currently prohibited, directly or indirectly, from paying any dividends to the Company, from making any other distribution on such subsidiary’s capital stock, from repaying to the Company, any loans or advances to such subsidiary from the Company, or from transferring any of such subsidiary’s property or assets to the Company, or any other subsidiary of the Company, except as described in or contemplated by the Disclosure Package and the Prospectus.

     yy) No Unlawful Contributions or Other Payments by the Company. Except as otherwise disclosed in the Disclosure Package and the Prospectus, neither the Company nor any of its subsidiaries nor, to the knowledge of the Company, any employee or agent of the Company or any subsidiary, has made any contribution or other payment to any official of, or candidate for, any federal, state or foreign office in violation of any law or of the character necessary to be disclosed in the Disclosure Package and the Prospectus in order to make the statements therein, in light of the circumstances in which they were made, not misleading.

     zz) No Unlawful Contributions or Other Payments by ICG. To the knowledge of the Company, except as otherwise disclosed in the Disclosure Package and the Prospectus, neither ICG nor any of its subsidiaries nor any employee or agent of ICG or any subsidiary, has made any contribution or other payment to any official of, or candidate for, any federal, state or foreign office in violation of any law or of the character necessary to be disclosed in the Disclosure Package and the Prospectus in order to make the statements therein, in light of the circumstances in which they were made, not misleading.

     aaa) No Conflict with Money Laundering Laws by the Company. The operations of the Company and its subsidiaries are and have been conducted at all times in compliance with applicable financial recordkeeping and reporting requirements of the Currency and Foreign Transactions Reporting Act of 1970, as amended, the money laundering statutes of all applicable jurisdictions, the rules and regulations thereunder and any related or similar rules, regulations or guidelines issued, administered or enforced by any governmental agency (collectively, the “Money Laundering Laws”) and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its subsidiaries with respect to the Money Laundering Laws is pending or, to the knowledge of the Company, threatened.

     bbb) No Conflict with Money Laundering Laws by ICG. To the knowledge of the Company, the operations of ICG and its subsidiaries are and have been conducted at all times in compliance with applicable financial recordkeeping and reporting requirements of the Money Laundering Laws and no action, suit or proceeding by or before any court or governmental

agency, authority or body or any arbitrator involving ICG or any of its subsidiaries with respect to the Money Laundering Laws is pending or, to the knowledge of the Company, threatened.

     ccc) No Conflict with OFAC Laws. Neither the Company nor any of its subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee or affiliate of the Company or any of its subsidiaries is currently subject to any U.S. sanctions administered by the Office of Foreign Assets Control of the U.S. Treasury Department (“OFAC”); and the Company will not directly or indirectly use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other person or entity, for the purpose of financing the activities of any person currently subject to any U.S. sanctions administered by OFAC.

     ddd) No Conflict with OFAC Laws by the Company. To the knowledge of the Company, neither ICG nor any of its subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee or affiliate of ICG or any of its subsidiaries is currently subject to any U.S. sanctions administered by OFAC; and ICG will not directly or indirectly use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other person or entity, for the purpose of financing the activities of any person currently subject to any U.S. sanctions administered by OFAC.

     eee) No Conflict with Foreign Corrupt Practices Act by the Company. Except as otherwise disclosed in the Disclosure Package and the Prospectus, neither the Company nor any of its subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee or other person associated with or acting on behalf of the Company or any of its subsidiaries has (i) used any corporate funds for any unlawful contribution, gift, entertainment or other unlawful expense relating to political activity; (ii) made any direct or indirect unlawful payment to any foreign or domestic government official or employee from corporate funds; (iii) violated or is in violation of any provision of the Foreign Corrupt Practices Act of 1977; or (iv) made any bribe, rebate, payoff, influence payment, kickback or other unlawful payment.

     fff) No Conflict with Foreign Corrupt Practices Act by ICG. To the knowledge of the Company, except as otherwise disclosed in the Disclosure Package and the Prospectus, neither ICG nor any of its subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee or other person associated with or acting on behalf of ICG or any of its subsidiaries has (i) used any corporate funds for any unlawful contribution, gift, entertainment or other unlawful expense relating to political activity; (ii) made any direct or indirect unlawful payment to any foreign or domestic government official or employee from corporate funds; (iii) violated or is in violation of any provision of the Foreign Corrupt Practices Act of 1977; or (iv) made any bribe, rebate, payoff, influence payment, kickback or other unlawful payment.

     ggg) Merger Agreement. The Merger Agreement has been duly and validly authorized, executed and delivered by the Company, and is a legal, valid and binding obligation of the Company, enforceable against the Company in accordance with its terms, except as the enforcement hereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors generally or by general equitable principles (regardless of whether enforcement is considered in a proceeding at law or in equity). The Company reasonably believes that the conditions to the Merger set forth in

the Merger Agreement will be satisfied, and that the Merger will be consummated on the terms, and as otherwise contemplated by, the Disclosure Package and the Prospectus.

     Any certificate signed by an officer of the Company and delivered to the Representatives or to counsel for the Underwriters shall be deemed to be a representation and warranty by the Company to each Underwriter as to the matters set forth therein.

     Section 2. Purchase, Sale and Delivery of the Shares.

          a) The Firm Shares. The Company agrees to issue and sell to the several Underwriters the Firm Shares upon the terms herein set forth. On the basis of the representations, warranties and agreements herein contained, and upon the terms but subject to the conditions herein set forth, the Underwriters agree, severally and not jointly, to purchase from the Company the respective number of Firm Shares set forth opposite their names on Schedule A. The purchase price per Firm Common Share to be paid by the several Underwriters to the Company shall be $26.055 per share.

          b) The Closing Date. Delivery of certificates for the Firm Shares to be purchased by the Underwriters and payment therefor shall be made at the offices of Shearman & Sterling LLP, 599 Lexington Avenue, New York, New York 10022-6069 (or such other place as may be agreed to by the Company and Morgan Stanley) at 9:00 a.m., New York City time, on June 8, 2011, or such other time and date as the Underwriters and the Company shall mutually agree (the time and date of such closing are called the “Closing Date”).

          c) The Optional Shares; the Subsequent Closing Date. In addition, on the basis of the representations, warranties and agreements herein contained, and upon the terms but subject to the conditions herein set forth, the Company hereby grants an option to the several Underwriters to purchase, severally and not jointly, up to an aggregate of 7,200,000 Optional Shares from the Company at the same price as the purchase price per share to be paid by the Underwriters for the Firm Shares. The option granted hereunder may be exercised at any time and from time to time upon notice by Morgan Stanley to the Company, which notice may be given at any time within 30 days from the date of this Agreement. Such notice shall set forth (i) the aggregate number of Optional Shares as to which the Underwriters are exercising the option, (ii) the names and denominations in which the certificates for the Optional Shares are to be registered and (iii) the time, date and place at which such certificates will be delivered (which time and date may be simultaneous with, but not earlier than, the Closing Date; and in such case the term “Closing Date” shall refer to the time and date of delivery of certificates for the Firm Shares and the Optional Shares). Each time and date of delivery, if subsequent to the Closing Date, is called a “Subsequent Closing Date” and shall be determined by Morgan Stanley and shall not be earlier than three nor later than five full business days after delivery of such notice of exercise. If any Optional Shares are to be purchased, each Underwriter agrees, severally and not jointly, to purchase the number of Optional Shares (subject to such adjustments to eliminate fractional shares as Morgan Stanley may determine) that bears the same proportion to the total number of Optional Shares to be purchased as the number of Firm Shares set forth on Schedule A opposite the name of such Underwriter bears to the total number of Firm Shares.

          d) Public Offering of the Shares. Morgan Stanley hereby advises the Company that the Underwriters intend to offer for sale to the public, as described in the Disclosure Package and the Prospectus, their respective portions of the Shares as soon after the Execution Time as Morgan Stanley, in its sole judgment, has determined is advisable and practicable.

          e) Payment for the Shares. Payment for the Shares shall be made at the Closing Date (and, if applicable, at any Subsequent Closing Date) by wire transfer of immediately available funds to the order of the Company.

     It is understood that the Representatives have been authorized, for their own account and the accounts of the several Underwriters, to accept delivery of and receipt for, and make payment of the purchase price for, the Firm Shares and any Optional Shares the Underwriters have agreed to purchase. Morgan Stanley, individually and not as a Representative of the Underwriters, may (but shall not be obligated to) make payment for any Shares to be purchased by any Underwriter whose funds shall not have been received by the Representatives by the Closing Date or any Subsequent Closing Date, as the case may be, for the account of such Underwriter, but any such payment shall not relieve such Underwriter from any of its obligations under this Agreement.

          f) Delivery of the Shares. Delivery of the Firm Shares and the Optional Shares shall be made through the facilities of The Depository Trust Company unless Morgan Stanley shall otherwise instruct. Time shall be of the essence, and delivery at the time and place specified in this Agreement is a further condition to the obligations of the Underwriters.

          g) Delivery of Prospectus to the Underwriters. Not later than 3:00 p.m. on the first business day in New York City following the date of this Agreement, the Company shall deliver, or cause to be delivered, copies of the Prospectus in such quantities and at such places as Morgan Stanley shall request.

     Section 3. Covenants of the Company.

     The Company covenants and agrees with each Underwriter as follows:

          a) Morgan Stanley’s Review of Proposed Amendments and Supplements. During the period beginning at the Applicable Time and ending on the later of the Closing Date or such date, as in the opinion of counsel for the Underwriters, the Prospectus is no longer required by law to be delivered in connection with sales by an Underwriter or dealer, including in circumstances where such requirement may be satisfied pursuant to Rule 172 (the “Prospectus Delivery Period”), prior to amending or supplementing the Registration Statement, the Disclosure Package or the Prospectus (including any amendment or supplement through incorporation by reference of any report filed under the Exchange Act), the Company shall furnish to Morgan Stanley for review a copy of each such proposed amendment or supplement, and the Company shall not file or use any such proposed amendment or supplement to which Morgan Stanley reasonably objects.

          b) Securities Act Compliance. After the date of this Agreement, the Company shall promptly advise Morgan Stanley in writing (i) when the Registration Statement, if not effective at the Execution Time, shall have become effective, (ii) of the receipt of any comments of, or

     requests for additional or supplemental information from, the Commission, (iii) of the time and date of any filing of any post-effective amendment to the Registration Statement or any amendment or supplement to any preliminary prospectus or the Prospectus, (iv) of the time and date that any post-effective amendment to the Registration Statement becomes effective and (v) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or of any order or notice preventing or suspending the use of the Registration Statement, any preliminary prospectus or the Prospectus, or of any proceedings to remove, suspend or terminate from listing or quotation the Common Stock from any securities exchange upon which it is listed for trading or included or designated for quotation, or of the threatening or initiation of any proceedings for any of such purposes. The Company shall use its best efforts to prevent the issuance of any such stop order or notice of prevention or suspension of such use. If the Commission shall enter any such stop order or issue any such notice at any time, the Company will use its best efforts to obtain the lifting or reversal of such order or notice at the earliest possible moment, or, subject to Section 3(a), will file an amendment to the Registration Statement or will file a new registration statement and use its best efforts to have such amendment or new registration statement declared effective as soon as practicable. Additionally, the Company agrees that it shall comply with the provisions of Rules 424(b) and 430B, as applicable, under the Securities Act, including with respect to the timely filing of documents thereunder, and will use its reasonable efforts to confirm that any filings made by the Company under such Rule 424(b) under the Securities Act were received in a timely manner by the Commission.

          c) Delivery of Registration Statements. The Company has furnished or will deliver to the Representatives and counsel for the Underwriters, without charge, as such Representatives or counsel for the Underwriters may reasonably request, signed copies of the Registration Statement as originally filed and of each amendment thereto (including exhibits filed therewith or incorporated by reference therein and documents incorporated or deemed to be incorporated by reference therein). The Registration Statement and each amendment thereto furnished to the Underwriters will be virtually identical to any electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

          d) Exchange Act Compliance. During the Prospectus Delivery Period, the Company will file all documents required to be filed with the Commission pursuant to Section 13, 14 or 15 of the Exchange Act in the manner and within the time periods required by the Exchange Act.

          e) Amendments and Supplements to the Registration Statement, Disclosure Package and Prospectus and Other Securities Act Matters. If, during the Prospectus Delivery Period, any event or development shall occur or condition exist as a result of which the Disclosure Package or the Prospectus as then amended or supplemented would include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein in the light of the circumstances under which they were made or then prevailing, as the case may be, not misleading, or if it shall be necessary to amend or supplement the Disclosure Package or the Prospectus, or to file under the Exchange Act any document incorporated by reference in the Disclosure Package or the Prospectus, in order to make the statements therein, in the light of the circumstances under which they were made or then prevailing, as the case may be, not misleading, or if in the opinion of Morgan Stanley it is otherwise necessary or advisable to amend or supplement the Registration Statement, the Disclosure Package or the Prospectus, or to

file under the Exchange Act any document incorporated by reference in the Disclosure Package or the Prospectus, or to file a new registration statement containing the Prospectus, in order to comply with law, including in connection with the delivery of the Prospectus, the Company agrees to (i) notify Morgan Stanley of any such event or condition and (ii) promptly prepare (subject to Sections 3(a) and 3(e) hereof), file with the Commission (and use its best efforts to have any amendment to the Registration Statement or any new registration statement to be declared effective) and furnish at its own expense to the Underwriters and to dealers, amendments or supplements to the Registration Statement, the Disclosure Package or the Prospectus, or any new registration statement, necessary in order to make the statements in the Disclosure Package or the Prospectus as so amended or supplemented, in the light of the circumstances under which they were made or then prevailing, as the case may be, not misleading or so that the Registration Statement, the Disclosure Package or the Prospectus, as amended or supplemented, will comply with law.

          f) Permitted Free Writing Prospectuses. The Company represents that it has not made, and agrees that, unless it obtains the prior written consent of Morgan Stanley, it will not make, any offer relating to the Shares that constitutes or would constitute an Issuer Free Writing Prospectus or that otherwise constitutes or would constitute a “free writing prospectus” (as defined in Rule 405 under the Securities Act) or a portion thereof required to be filed by the Company with the Commission or retained by the Company under Rule 433 under the Securities Act; provided that the prior written consent of Morgan Stanley hereto shall be deemed to have been given in respect of the Free Writing Prospectuses included in Schedule C hereto and any electronic road show. Any such free writing prospectus consented to by Morgan Stanley is hereinafter referred to as a “Permitted Free Writing Prospectus”. The Company agrees that (i) it has treated and will treat, as the case may be, each Permitted Free Writing Prospectus as an Issuer Free Writing Prospectus, and (ii) has complied and will comply, as the case may be, with the requirements of Rules 164 and 433 under the Securities Act applicable to any Permitted Free Writing Prospectus, including in respect of timely filing with the Commission, legending and record keeping.

          g) Copies of any Amendments and Supplements to the Prospectus. The Company agrees to furnish the Representatives, without charge, during the Prospectus Delivery Period, as many copies of each preliminary prospectus, the Prospectus and any amendments and supplements thereto (including any documents incorporated or deemed incorporated by reference therein) and the Disclosure Package as the Representatives may reasonably request.

          h) Copies of the Registration Statement. The Company will furnish to the Representatives and counsel for the Underwriters signed copies of the Registration Statement (including exhibits thereto).

          i) Blue Sky Compliance. The Company shall cooperate with the Representatives and counsel for the Underwriters to qualify or register (or to obtain exemptions from qualifying or registering) all or any part of the Shares for offer and sale under the securities laws of the several states of the United States, the provinces of Canada or any other jurisdictions designated by the Representatives, shall comply with such laws and shall continue such qualifications,

registrations and exemptions in effect so long as required for the distribution of the Shares. The Company shall not be required to qualify as a foreign corporation, as the case may be, or to take any action that would subject it to general service of process in any such jurisdiction where it is not presently qualified or where it would be subject to taxation as a foreign corporation, as the case may be. The Company will advise the Representatives promptly of the suspension of the qualification or registration of (or any such exemption relating to) the Shares for offering, sale or trading in any jurisdiction or any initiation or known threat of any proceeding for any such purpose, and in the event of the issuance of any order suspending such qualification, registration or exemption, the Company shall use its commercially reasonable efforts to obtain the withdrawal thereof at the earliest possible moment.

          j) Use of Proceeds. The Company shall apply the net proceeds from the sale of the Shares sold by it in the manner described under the caption “Use of Proceeds” in the Disclosure Package and the Prospectus.

          k) Transfer Agent. The Company shall engage and maintain, at its expense, a registrar and transfer agent for the Common Stock.

          l) Earning Statement. As soon as practicable, the Company will make generally available to its security holders and to the Representatives an earning statement (which need not be audited) covering the twelve-month period beginning after the date hereof that satisfies the provisions of Section 11(a) of the Securities Act and Rule 158 under the Securities Act.

          m) Periodic Reporting Obligations. During the Prospectus Delivery Period, the Company shall file, on a timely basis, with the Commission and the NYSE all reports and documents required to be filed under Section 13 or Section 15 of the Exchange Act.

          n) Listing. The Company will use its best efforts to list, subject to notice of issuance, the Shares on NYSE.

          o) Agreement Not to Offer or Sell Additional Shares. During the period commencing on the date hereof and ending on the 90^th day following the date of the Prospectus, the Company will not, without the prior written consent of Morgan Stanley (which consent may be withheld at the sole discretion of Morgan Stanley), directly or indirectly, sell, offer, contract or grant any option to sell, pledge, transfer or establish an open “put equivalent position” or liquidate or decrease a “call equivalent position” within the meaning of Rule 16a-1(h) under the Exchange Act, or otherwise dispose of or transfer (or enter into any transaction which is designed to, or might reasonably be expected to, result in the disposition of), or announce the offering of, or file any registration statement under the Securities Act in respect of, any shares of Common Stock, options or warrants to acquire shares of the Common Stock or securities exchangeable or exercisable for or convertible into shares of Common Stock (other than as contemplated by this Agreement with respect to the Shares); provided, however, that (i) the Company may issue shares of its Common Stock or options to purchase its Common Stock, or Common Stock upon exercise of options, pursuant to any stock option, stock bonus or other stock plan or arrangement described in the Prospectus, but only if the director or senior officer holders of such shares, options, or shares issued upon exercise of such options, agree in writing not to sell, offer, dispose of or otherwise transfer any such shares or options during such 90-day

period without the prior written consent of Morgan Stanley (which consent may be withheld at the sole discretion of Morgan Stanley) and (ii) the Company may issue up to 1,000,000 shares of its Common Stock in connection with the Company’s required pension contributions. Notwithstanding the foregoing, if (x) during the last 17 days of the 90-day restricted period the Company issues an earnings release or material news or a material event relating to the Company occurs, or (y) prior to the expiration of the 90-day restricted period, the Company announces that it will release earnings results during the 16-day period beginning on the last day of the 90-day period, the restrictions imposed in this clause shall continue to apply until the expiration of the 18-day period beginning on the date of the issuance of the earnings release or the occurrence of the material news or material event. The Company will provide the Representatives and any Underwriters and each individual subject to the restricted period pursuant to the lockup letters described in Section 5(h) with prior notice of any such announcement that gives rise to an extension of the restricted period.

          p) Registration Statement Renewal Deadline. If immediately prior to the third anniversary (the “Renewal Deadline”) of the initial effective date of the Registration Statement, any of the Shares remain unsold by the Underwriters, the Company will prior to the Renewal Deadline file, if it has not already done so and is eligible to do so, a new automatic shelf registration statement relating to the Shares, in a form satisfactory to the Representatives. If the Company is no longer eligible to file an automatic shelf registration statement, the Company will prior to the Renewal Deadline, if it has not already done so, file a new shelf registration statement relating to the Shares, in a form satisfactory to the Representatives, and will use its best efforts to cause such registration statement to be declared effective within 60 days after the Renewal Deadline. The Company will take all other action necessary or appropriate to permit the public offering and sale of the Shares to continue as contemplated in the expired registration statement relating to the Shares. References herein to the Registration Statement shall include such new automatic shelf registration statement or such new shelf registration statement, as the case may be.

          q) Notice of Inability to Use Automatic Shelf Registration Statement Form. If at any time during the Prospectus Delivery Period, the Company receives from the Commission a notice pursuant to Rule 401(g)(2) or otherwise ceases to be eligible to use the automatic shelf registration statement form, the Company will (i) promptly notify the Representatives, (ii) promptly file a new registration statement or post-effective amendment on the proper form relating to the Shares, in a form satisfactory to the Representatives, (iii) use its best efforts to cause such registration statement or post-effective amendment to be declared effective and (iv) promptly notify the Representatives of such effectiveness. The Company will take all other action necessary or appropriate to permit the public offering and sale of the Shares to continue as contemplated in the registration statement that was the subject of the Rule 401(g)(2) notice or for which the Company has otherwise become ineligible. References herein to the Registration Statement shall include such new registration statement or post-effective amendment, as the case may be.

          r) Filing Fees. The Company agrees to pay the required Commission filing fees relating to the Shares within the time required by and in accordance with Rule 456(b)(1) and 457(r) of the Securities Act.

          s) Compliance with Sarbanes-Oxley Act. The Company will comply with all applicable securities and other laws, rules and regulations, including, without limitation, the Sarbanes-Oxley Act, and use its best efforts to cause the Company’s directors and officers, in their capacities as such, to comply with such laws, rules and regulations, including, without limitation, the provisions of the Sarbanes-Oxley Act.

          t) Future Reports to Stockholders. The Company will furnish to its stockholders within the required timing of the NYSE and the Commission after the end of each fiscal year an annual report (including a balance sheet and statements of income, stockholders’ equity and cash flows of the Company and its consolidated subsidiaries certified by independent public accountants) and, as soon as practicable after the end of each of the first three quarters of each fiscal year (beginning with the fiscal quarter ending after the effective date of the Registration Statement), make available to its stockholders consolidated summary financial information of the Company and its subsidiaries for such quarter in reasonable detail.

          u) Future Reports to the Representatives. During the period of two years hereafter the Company will furnish to the Representatives at 1585 Broadway, New York, New York 10036 or make publicly available via the Commission’s Electronic Data Gathering, Analysis and Retrieval system (or any successor system) or the Company’s Internet website: (i) as soon as practicable after the end of each fiscal year, copies of the Annual Report of the Company containing the balance sheet of the Company as of the close of such fiscal year and statements of income, stockholders’ equity and cash flows for the year then ended and the opinion thereon of the Company’s independent public or certified public accountants; (ii) as soon as practicable after the filing thereof, copies of each proxy statement, Annual Report on Form 10-K, Quarterly Report on Form 10-Q, Current Report on Form 8-K or other report filed by the Company with the Commission, FINRA or any securities exchange; and (iii) as soon as available, copies of any report or communication of the Company mailed generally to holders of its capital stock.

          v) Investment Limitation. The Company shall not invest, or otherwise use the proceeds received by the Company from its sale of the Shares in such a manner as would require the Company or any of its subsidiaries to register as an investment company under the Investment Company Act.

          w) No Manipulation of Price. The Company will not take, directly or indirectly, any action designed to cause or result in, or that has constituted or might reasonably be expected to constitute, under the Exchange Act or otherwise, the stabilization or manipulation of the price of any securities of the Company to facilitate the sale or resale of the Shares.

          x) Existing Lock-Up Agreements. The Company will enforce all existing agreements between the Company and any of its security holders that prohibit the sale, transfer, assignment, pledge or hypothecation of any of the Company’s securities in connection with the offering contemplated by this Agreement. In addition, the Company will direct the transfer agent to place stop transfer restrictions upon any such securities of the Company that are bound by such existing “lock-up” agreements for the duration of the periods contemplated in such agreements.

          y) Merger Agreement. If, subsequent to the Closing Date for the Firm Shares but prior to expiration of the option to purchase Optional Shares provided in Section 2, the Merger

Agreement is terminated or amended, the Company shall notify the Representatives in accordance with Section 15 of this Agreement.

          The Representatives, on behalf of the several Underwriters, may, in their sole discretion, waive in writing the performance by the Company of any one or more of the foregoing covenants or extend the time for their performance.

           Section 4. Payment of Expenses. The Company agrees to pay all costs, fees and expenses incurred in connection with the performance of its obligations hereunder and in connection with the transactions contemplated hereby, including without limitation (i) all expenses incident to the issuance and delivery of the Shares (including all printing and engraving costs), (ii) all necessary issue, transfer and other stamp taxes in connection with the issuance and sale of the Shares to the Underwriters, (iii) all fees and expenses of the Company’s counsel, independent registered public accounting firm and other advisors, (iv) all costs and expenses incurred in connection with the preparation, printing, filing, shipping and distribution of the Registration Statement (including financial statements, exhibits, schedules, consents and certificates of experts), each Issuer Free Writing Prospectus, the Preliminary Prospectus and the Prospectus, and all amendments and supplements thereto, and this Agreement, (v) all filing fees, reasonable attorneys’ fees and expenses incurred by the Company or the Underwriters in connection with qualifying or registering (or obtaining exemptions from the qualification or registration of) all or any part of the Shares for offer and sale under the securities laws of the several states of the United States, the provinces of Canada or other jurisdictions designated by the Underwriters (including, without limitation, the cost of preparing, printing and mailing preliminary and final blue sky or legal investment memoranda and any related supplements to the Registration Statement, the Disclosure Package or the Prospectus), (vi) any filing fees incident to, and any reasonable fees and disbursements of counsel to the Underwriters in connection with, the review by FINRA, if any, of the terms of the sale of the Shares, (vii) all costs and expenses incident to listing the Shares on the NYSE, (viii) the cost of printing certificates representing the Shares, (ix) all fees and expenses (including reasonable fees and expenses of counsel) of the Company in connection with any transfer agent, registrar or depositary and with the approval of the Shares by the Depositary for “book-entry” transfer, and the performance by the Company of its other obligations under this Agreement, (x) the Company’s costs and expenses relating to investor presentations on any “road show” undertaken in connection with the marketing of the offering of the Securities, including, without limitation, expenses associated with the preparation or dissemination of any electronic road show, expenses associated with production of road show slides and graphics, fees and expenses of any consultants engaged in connection with the road show presentations with the prior approval of the Company, travel and lodging expenses of the representatives and officers of the Company and any such consultants, and the cost of any aircraft chartered in connection with the road show and (xi) all other fees, costs and expenses incurred in connection with the performance of its obligations hereunder for which provision is not otherwise made in this Section. Except as provided in this Section 4 and Sections 6, 8 and 9 hereof, the Underwriters shall pay their own expenses, including the fees and disbursements of their counsel.

          Section 5. Conditions of the Obligations of the Underwriters. The obligations of the several Underwriters to purchase and pay for the Shares as provided herein on the Closing Date

and, with respect to the Optional Shares, any Subsequent Closing Date, shall be subject to the accuracy of the representations and warranties on the part of the Company set forth in Section 1 hereof as of the date hereof, as of the Applicable Time, and as of the Closing Date and, with respect to the Optional Shares, as of any Subsequent Closing Date, as though then made and to the timely performance by the Company of its covenants and other obligations hereunder, and to each of the following additional conditions:

          a) Accountants’ Comfort Letter. On the date hereof, the Underwriters shall have received from Ernst & Young LLP, independent public or certified public accountants for the Company, a “comfort letter” dated the date hereof addressed to the Underwriters, in form and substance satisfactory to the Representatives, covering certain financial information in the Disclosure Package and other customary matters. In addition, on the Closing Date, and any Subsequent Closing Date, the Underwriters shall have received from such accountants, a “bring-down comfort letter” dated the Closing Date addressed to the Underwriters, in form and substance satisfactory to the Representatives, in the form of the “comfort letter” delivered on the date hereof, except that (i) it shall cover certain financial information in the Prospectus and any amendment or supplement thereto and (ii) procedures shall be brought down to a date no more than 5 days prior to such Closing Date.

          b) Accountants’ Comfort Letter. On the date hereof, the Underwriters shall have received from Deloitte & Touche LLP, independent public or certified public accountants for ICG, a “comfort letter” dated the date hereof addressed to the Underwriters, in form and substance satisfactory to the Representatives, covering certain financial information in the Disclosure Package and other customary matters. In addition, on the Closing Date, and any Subsequent Closing Date, the Underwriters shall have received from such accountants, a “bring-down comfort letter” dated the Closing Date addressed to the Underwriters, in form and substance satisfactory to the Representatives, in the form of the “comfort letter” delivered on the date hereof, except that (i) it shall cover certain financial information in the Prospectus and any amendment or supplement thereto and (ii) procedures shall be brought down to a date no more than 5 days prior to such Closing Date.

          c) Compliance with Registration Requirements; No Stop Order; No Objection from FINRA. No stop order suspending the effectiveness of the Registration Statement (which became effective upon its filing with the Commission) shall have been issued under the Securities Act and no proceedings for that purpose shall have been instituted or be pending or threatened by the Commission. For the period from and after effectiveness of this Agreement and prior to the Closing Date and, with respect to the Optional Shares, any Subsequent Closing Date:

(i) the Company shall have filed the Prospectus with the Commission (including the information required by Rule 430B under the Securities Act) in the manner and within the time period required by Rule 424(b) under the Securities Act; or the Company shall have filed a post-effective amendment to the Registration Statement containing the information required by such Rule 430B under the Securities Act, and such post-effective amendment shall have become effective;

(ii) all material required to be filed by the Company pursuant to Rule 433(d) under the Securities Act (if any) shall have been filed with the Commission within the applicable time periods prescribed for such filings under such Rule 433 under the Securities Act;

(iii) no stop order suspending the effectiveness of the Registration Statement, or any post-effective amendment to the Registration Statement, shall be in effect and no proceedings for such purpose shall have been instituted or threatened by the Commission, and the Company shall not have received from the Commission any notice pursuant to Rule 401(g)(2) of the Securities Act objecting to the use of the automatic shelf registration form; and

(iv) FINRA shall have raised no objection to the fairness and reasonableness of the underwriting terms and arrangements.

          d) No Material Adverse Effect or Ratings Agency Change. For the period from and after the date of this Agreement and prior to the Closing Date and, with respect to the Optional Shares, any Subsequent Closing Date:

(i) in the judgment of the Representatives there shall not have occurred any change having an Arch Coal Material Adverse Effect; and

(ii) there shall not have occurred any downgrading, nor shall any notice have been given of any intended or potential downgrading or of any review for a possible change that does not indicate the direction of the possible change, in the rating accorded the Company or any of its subsidiaries or any of their securities or indebtedness by any “nationally recognized statistical rating organization,” as such term is defined in Section 3(a)(62) of the Exchange Act.

          e) Opinion of Counsel for the Company. On the Closing Date and any Subsequent Closing Date, the Underwriters shall have received the favorable opinions of (i) Robert G. Jones, Senior Vice President — Law, General Counsel and Secretary of the Company, the form of which is attached as Exhibit A-1, and (ii) Simpson Thacher & Bartlett LLP, counsel for the Company, dated as of such Closing Date, the form of which is attached as Exhibit A-2.

          f) Opinion of Counsel for the Underwriters. On the Closing Date and any Subsequent Closing Date, the Representatives shall have received the favorable opinion of Shearman & Sterling LLP, counsel for the Underwriters, dated as of such Closing Date, with respect to such matters as may be reasonably requested by the Underwriters.

          g) Officers’ Certificate. On the Closing Date and any Subsequent Closing Date, the Representatives shall have received a written certificate executed by the Chairman of the Board and Chief Executive Officer or the President and Chief Operating Officer or the Senior Vice President and Chief Financial Officer of the Company, dated as of such Closing Date, to the effect set forth in Section 5(e)(ii) hereof, and further to the effect that:

     (i) for the period from and after the date of this Agreement and prior to the Closing Date or such Subsequent Closing Date, as the case may be, there has not occurred any change having an Arch Coal Material Adverse Effect;

     (ii) the Company has received no stop order suspending the effectiveness of the Registration Statement, and no proceedings for such purpose have been instituted or, to such person’s knowledge, threatened by the Commission;

     (iii) the Company has not received from the Commission any notice pursuant to Rule 401(g)(2) of the Securities Act objecting to use of the automatic shelf registration statement form;

     (iv) the representations, warranties and covenants of the Company set forth in Section 1 of this Agreement are true and correct with the same force and effect as though expressly made on and as of the Closing Date or such Subsequent Closing Date; and

     (v) the Company has complied with all the agreements hereunder and satisfied all the conditions on its part to be performed or satisfied hereunder at or prior to such Closing Date or such Subsequent Closing Date, as the case may be.

               h) Merger Agreement. At the Closing Date for the Firm Shares, the Merger Agreement shall not have been terminated by the Company.

               i) Listing of Shares. The Shares shall have been listed and admitted and authorized for trading on the NYSE, and satisfactory evidence of such actions shall have been provided to the Representatives.

               j) Additional Documents. On or before the Closing Date and any Subsequent Closing Date, the Representatives and counsel for the Underwriters shall have received such information, documents and opinions as they may reasonably require for the purposes of enabling them to pass upon the issuance and sale of the Shares as contemplated herein, or in order to evidence the accuracy of any of the representations and warranties, or the satisfaction of any of the conditions or agreements, herein contained.

               k) Lock-up Agreement for Certain Securityholders of the Company. On or prior to the date hereof, the Company shall have furnished to the Representatives an agreement in the form of Schedule B hereto from each of the executive officers and directors of the Company, and such agreement shall be in full force and effect on each of the Closing Date and any Subsequent Closing Date.

     If any condition specified in this Section 5 is not satisfied when and as required to be satisfied, this Agreement may be terminated by the Representatives by notice to the Company at any time on or prior to the Closing Date and, with respect to the Optional Shares, at any time prior to the applicable Subsequent Closing Date, which termination shall be without liability on the part of any party to any other party, except that Sections 4, 6, 8, 9, 14 and 18 shall at all times be effective and shall survive such termination.

     Section 6. Reimbursement of Underwriters’ Expenses. If this Agreement is terminated by the Representatives pursuant to Section 5 or Section 11, or if the sale to the Underwriters of the Shares on the Closing Date or any Subsequent Closing Date is not consummated because of any refusal, inability or failure on the part of the Company to perform any agreement herein or to comply with any provision hereof, the Company agrees to reimburse the Representatives and the other Underwriters, severally, upon demand for all out-of-pocket expenses that shall have been reasonably incurred by the Representatives and the Underwriters in connection with the proposed purchase and the offering and sale of the Shares, including, without limitation, reasonable fees and disbursements of counsel, printing expenses, travel expenses, postage, facsimile and telephone charges.

     Section 7. Effectiveness of this Agreement. This Agreement shall become effective upon the execution of this Agreement by the parties hereto.

     Section 8. Indemnification.

     (a) Indemnification of the Underwriters. The Company agrees to indemnify and hold harmless each Underwriter, its directors, officers, employees and affiliates, and each person, if any, who controls any Underwriter within the meaning of the Securities Act and the Exchange Act against any loss, claim, damage, liability or expense, as incurred, to which such Underwriter, director, officer, employee, affiliate or controlling person may become subject, under the Securities Act, the Exchange Act or other federal or state statutory law or regulation, or at common law or otherwise (including in settlement of any litigation, if such settlement is effected with written consent of the Company or without the written consent of the Company in accordance with Section 8(d)), insofar as such loss, claim, damage, liability or expense (or actions in respect thereof as contemplated below) arises out of or is based: (i) upon any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement (or any amendment or supplement thereto, including any information deemed to be a part thereof pursuant to Rule 430A, Rule 430B or Rule 430C under the Securities Act), or the omission or alleged omission therefrom of a material fact required to be stated therein or necessary in order to make the statements therein not misleading; or (ii) upon any untrue statement or alleged untrue statement of a material fact contained in any Issuer Free Writing Prospectus, the Preliminary Prospectus or the Prospectus (or any amendment or supplement thereto) or any “road show” (as defined in Rule 433 under the Securities Act) not constituting an Issuer Free Writing Prospectus (a “Non-IFWP Road Show”), or the omission or alleged omission therefrom of a material fact, in each case, necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; or; (iii) in whole or in part upon any inaccuracy in the representations and warranties of the Company contained herein; or (iv) in whole or in part upon any failure of the Company to perform its obligations hereunder or under law; or (v) upon any act or failure to act or any alleged act or failure to act by any Underwriter in connection with, or relating in any manner to, the offering contemplated hereby, and which is included as part of or referred to in any loss, claim, damage, liability or action arising out of or based upon any matter covered by clauses (i) or (ii) above, provided that the Company shall not be liable under this clause (v) to the extent that a court of competent jurisdiction shall have determined by a final judgment that such loss, claim, damage, liability or action resulted directly from any such acts or failures to act undertaken or omitted to be taken by such Underwriter through its gross negligence or willful misconduct; and to reimburse each Underwriter and each

such director, officer, employee, affiliate or controlling person for any and all expenses (including the fees and disbursements of counsel chosen by Morgan Stanley) as such expenses are reasonably incurred by such Underwriter or such director, officer, employee, affiliate or controlling person in connection with investigating, defending, settling, compromising or paying any such loss, claim, damage, liability, expense or action; provided, however, that the foregoing indemnity agreement shall not apply to any loss, claim, damage, liability or expense to the extent, but only to the extent, arising out of or based upon any untrue statement or alleged untrue statement or omission or alleged omission made in reliance upon and in conformity with information furnished to the Company in writing by any Underwriter through the Representatives expressly for use in the Registration Statement, any Issuer Free Writing Prospectus, the Preliminary Prospectus or the Prospectus (or any amendment or supplement thereto) or any Non-IFWP Road Show, it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in Section 8(b) hereof. The indemnity agreement set forth in this Section 8(a) shall be in addition to any liabilities that the Company may otherwise have.

     (b) Indemnification of the Company. Each Underwriter agrees, severally and not jointly, to indemnify and hold harmless the Company, its directors, each of its officers who signed the Registration Statement, each of its respective employees and each person, if any, who controls the Company within the meaning of the Securities Act or the Exchange Act, against any loss, claim, damage, liability or expense, as incurred, to which the Company or any such director, officer or employee or controlling person may become subject, under the Securities Act, the Exchange Act, or other federal or state statutory law or regulation, or at common law or otherwise (including in settlement of any litigation, if such settlement is effected with the written consent of such Underwriter or without the written consent of such Underwriter in accordance with Section 8(d)), insofar as such loss, claim, damage, liability or expense (or actions in respect thereof as contemplated below) arises out of or is based (i) upon any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, or any amendment thereto, or the omission or alleged omission therefrom of a material fact required to be stated therein or necessary to make the statements therein not misleading; or (ii) upon any untrue statement or alleged untrue statement of a material fact contained in any Issuer Free Writing Prospectus, the Preliminary Prospectus or the Prospectus (or any amendment or supplement thereto) or any Non-IFWP Road Show, or arises out of or is based upon the omission or alleged omission therefrom of a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in the Registration Statement, any Issuer Free Writing Prospectus, the Preliminary Prospectus or the Prospectus (or any amendment or supplement thereto) or any Non-IFWP Road Show, in reliance upon and in conformity with information in writing furnished to the Company by any Underwriter through the Representatives expressly for use therein; and to reimburse the Company and each such director (or manager, as the case may be), officer or employee or controlling person for any and all expenses (including the fees and disbursements of counsel chosen by the Company) as such expenses are reasonably incurred by the Company or such director, officer or employee or controlling person in connection with investigating, defending, settling, compromising or paying any such loss, claim, damage, liability, expense or action. The Company hereby acknowledges that the only information that the Underwriters have furnished to the Company through the Representatives expressly for use in the Registration

Statement, any Issuer Free Writing Prospectus, the Preliminary Prospectus or the Prospectus (or any amendment or supplement thereto) or any Non-IFWP Road Show are the last sentence on the front cover of the Preliminary Prospectus and the Prospectus with respect to the delivery of the Shares, the names of each Underwriter appearing on the front cover and in the table under the caption “Underwriting” in the Preliminary Prospectus and the Prospectus and the tenth paragraph under the caption “Underwriting” in the Preliminary Prospectus and the Prospectus. The indemnity agreement set forth in this Section 8(b) shall be in addition to any liabilities that each Underwriter may otherwise have.

     (c) Notifications and Other Indemnification Procedures. Promptly after receipt by an indemnified party under this Section 8 of notice of the commencement of any action, such indemnified party will, if a claim in respect thereof is to be made against an indemnifying party under this Section 8, notify the indemnifying party in writing of the commencement thereof, but the omission so to notify the indemnifying party will not relieve it from any liability which it may have to any indemnified party for contribution or otherwise under the indemnity agreement contained in this Section 8 other than to the extent it is prejudiced as a proximate result of such failure. In case any such action is brought against any indemnified party and such indemnified party seeks or intends to seek indemnity from an indemnifying party, the indemnifying party will be entitled to participate in and, to the extent that it shall elect, jointly with all other indemnifying parties similarly notified, by written notice delivered to the indemnified party promptly after receiving the aforesaid notice from such indemnified party, to assume the defense thereof with counsel reasonably satisfactory to such indemnified party; provided, however, if the defendants in any such action include both the indemnified party and the indemnifying party and the indemnified party shall have reasonably concluded that a conflict may arise between the positions of the indemnifying party and the indemnified party in conducting the defense of any such action or that there may be legal defenses available to it and/or other indemnified parties which are different from or additional to those available to the indemnifying party, the indemnified party or parties shall have the right to select separate counsel to assume such legal defenses and to otherwise participate in the defense of such action on behalf of such indemnified party or parties. Upon receipt of notice from the indemnifying party to such indemnified party of such indemnifying party’s election so to assume the defense of such action and approval by the indemnified party of counsel, the indemnifying party will not be liable to such indemnified party under this Section 8 for any legal or other expenses subsequently incurred by such indemnified party in connection with the defense thereof unless (i) the indemnified party shall have employed separate counsel in accordance with the proviso to the next preceding sentence (it being understood, however, that the indemnifying party shall not be liable for the expenses of more than one separate counsel (together with local counsel), approved by the indemnifying party (Morgan Stanley in the case of Sections 8(b) and 9 hereof), representing the indemnified parties who are parties to such action) or (ii) the indemnifying party shall not have employed counsel satisfactory to the indemnified party to represent the indemnified party within a reasonable time after notice of commencement of the action, in each of which cases the fees and expenses of counsel shall be at the expense of the indemnifying party.

     (d) Settlements. The indemnifying party under this Section 8 shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the indemnifying party agrees to indemnify the indemnified party against any loss, claim, damage, liability or expense by reason of such

settlement or judgment. Notwithstanding the foregoing sentence, if at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel as contemplated by this Section 8, the indemnifying party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 60 days after receipt by such indemnifying party of the aforesaid request and (ii) such indemnifying party shall not have reimbursed the indemnified party in accordance with such request or disputed in good faith the indemnified party’s entitlement to such reimbursement prior to the date of such settlement. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement, compromise or consent to the entry of judgment in any pending or threatened action, suit or proceeding in respect of which any indemnified party is or could have been a party and indemnity was or could have been sought hereunder by such indemnified party, unless such settlement, compromise or consent (i) includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such action, suit or proceeding and (ii) does not include any statements as to or any findings of fault, culpability or a failure to act by or on behalf of any indemnified party.

     Section 9. Contribution. If the indemnification provided for in Section 8 is for any reason held to be unavailable to or otherwise insufficient to hold harmless an indemnified party in respect of any losses, claims, damages, liabilities or expenses referred to therein, then each indemnifying party shall contribute to the aggregate amount paid or payable by such indemnified party, as incurred, as a result of any losses, claims, damages, liabilities or expenses referred to therein (i) in such proportion as is appropriate to reflect the relative benefits received by the Company, on the one hand, and the Underwriters, on the other hand, from the offering of the Shares pursuant to this Agreement or (ii) if the allocation provided by clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company, on the one hand, and the Underwriters, on the other hand, in connection with the statements or omissions or inaccuracies in the representations and warranties herein which resulted in such losses, claims, damages, liabilities or expenses, as well as any other relevant equitable considerations. The relative benefits received by the Company, on the one hand, and the Underwriters, on the other hand, in connection with the offering of the Shares pursuant to this Agreement shall be deemed to be in the same respective proportions as the total net proceeds from the offering of the Shares pursuant to this Agreement (before deducting expenses) received by the Company, and the total underwriting discount received by the Underwriters, in each case as set forth on the front cover page of the Prospectus bear to the aggregate initial public offering price of the Shares as set forth on such cover. The relative fault of the Company, on the one hand, and the Underwriters, on the other hand, shall be determined by reference to, among other things, whether any such untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact or any such inaccurate or alleged inaccurate representation or warranty relates to information supplied by the Company, on the one hand, or the Underwriters, on the other hand, and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission or inaccuracy.

          The amount paid or payable by a party as a result of the losses, claims, damages, liabilities and expenses referred to above shall be deemed to include, subject to the limitations set forth in Section 8(c), any legal or other fees or expenses reasonably incurred by such party in

connection with investigating or defending any action or claim. The provisions set forth in Section 8(c) with respect to notice of commencement of any action shall apply if a claim for contribution is to be made under this Section 9; provided, however, that no additional notice shall be required with respect to any action for which notice has been given under Section 8 hereof for purposes of indemnification.

          The Company and the Underwriters agree that it would not be just and equitable if contribution pursuant to this Section 9 were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation which does not take account of the equitable considerations referred to in this Section 9.

          Notwithstanding the provisions of this Section 9, no Underwriter shall be required to contribute any amount in excess of the discount received by such Underwriter in connection with the Shares underwritten by it and distributed by it. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters’ obligations to contribute pursuant to this Section 9 are several, and not joint, in proportion to their respective commitments as set forth opposite their names in Schedule A. For purposes of this Section 9, each director, officer and employee of an Underwriter and each person, if any, who controls an Underwriter within the meaning of the Securities Act and the Exchange Act shall have the same rights to contribution as such Underwriter, and each director of the Company, each officer of the Company who signed the Registration Statement, each employee of the Company, and each person, if any, who controls the Company within the meaning of the Securities Act and the Exchange Act shall have the same rights to contribution as the Company.

     Section 10. Default of One or More of the Several Underwriters. If, on the Closing Date or a Subsequent Closing Date, as the case may be, any one or more of the several Underwriters shall fail or refuse to purchase Shares that it or they have agreed to purchase hereunder on such date, and the aggregate number of Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase does not exceed 10% of the aggregate number of the Shares to be purchased on such date, the other Underwriters shall be obligated, severally, in the proportions that the number of Firm Shares set forth opposite their respective names on Schedule A bears to the aggregate number of Firm Shares set forth opposite the names of all such non-defaulting Underwriters, or in such other proportions as may be specified by Morgan Stanley with the consent of the non-defaulting Underwriters, to purchase the Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase on such date. If, on the Closing Date or a Subsequent Closing Date, as the case may be, any one or more of the Underwriters shall fail or refuse to purchase Shares and the aggregate number of Shares with respect to which such default occurs exceeds 10% of the aggregate number of Shares to be purchased on such date, and arrangements satisfactory to Morgan Stanley and the Company for the purchase of such Shares are not made within 48 hours after such default, this Agreement shall terminate without liability of any party to any other party except that the provisions of Sections 4, 6, 8, 9, 14 and 18 shall at all times be effective and shall survive such termination. In any such case either Morgan Stanley or the Company shall have the right to postpone the Closing Date or a Subsequent Closing Date, as the case may be, but in no event for longer than seven

days in order that the required changes, if any, to the Registration Statement and the Prospectus or any other documents or arrangements may be effected.

     As used in this Agreement, the term “Underwriter” shall be deemed to include any person substituted for a defaulting Underwriter under this Section 10. Any action taken under this Section 10 shall not relieve any defaulting Underwriter from liability in respect of any default of such Underwriter under this Agreement.

     Section 11. Termination of this Agreement. Prior to the Closing Date, this Agreement may be terminated by the Representatives by notice given to the Company if at any time (i) trading or quotation in any of the Company’s securities shall have been suspended or limited by the Commission or by the NYSE, or trading in securities generally on either the Nasdaq Stock Market or the NYSE shall have been suspended or limited, or minimum or maximum prices shall have been generally established on any of such quotation system or stock exchange by the Commission or FINRA; (ii) a general banking moratorium shall have been declared by any of federal, New York or Delaware authorities; (iii) there shall have occurred any outbreak or escalation of national or international hostilities or any crisis or calamity, or any change in the United States or international financial markets, or any substantial change or development involving a prospective substantial change in United States’ or international political, financial or economic conditions, as in the judgment of the Representatives is material and adverse and makes it impracticable or inadvisable to proceed with the offering, sale or delivery of the Shares in the manner and on the terms described in the Disclosure Package or the Prospectus or to enforce contracts for the sale of securities; (iv) in the judgment of the Representatives there shall have occurred any Arch Material Adverse Effect; (v) the Company shall have sustained a loss by strike, fire, flood, earthquake, accident or other calamity of such character as in the judgment of the Representatives may interfere materially with the conduct of the business and operations of the Company regardless of whether or not such loss shall have been insured; or (vi) there shall have occurred a material disruption in commercial banking or securities settlement or clearance services. Any termination pursuant to this Section 11 shall be without liability of any party to any other party except as provided in Sections 4 and 6 hereof, and provided further that Sections 4, 6, 8, 9, 14 and 18 shall survive such termination and remain in full force and effect.

     Section 12. No Fiduciary Duty. The Company acknowledges and agrees that: (i) the offer and sale of the Shares pursuant to this Agreement, including the determination of the public offering price of the Shares and any related discounts and commissions, is an arm’s-length commercial transaction between the Company, on the one hand, and the several Underwriters, on the other hand, and the Company is capable of evaluating and understanding and understand and accept the terms, risks and conditions of the transactions contemplated by this Agreement; (ii) in connection with each transaction contemplated hereby and the process leading to such transaction each Underwriter is and has been acting solely as a principal and is not the financial advisor, agent or fiduciary of the Company or its affiliates, stockholders, creditors or employees or any other party (other than Morgan Stanley & Co. Incorporated acting as a financial advisor in connection with the Merger); (iii) no Underwriter has assumed or will assume an advisory, agency or fiduciary responsibility in favor of the Company with respect to any of the transactions contemplated hereby or the process leading thereto (irrespective of whether such Underwriter has advised or is currently advising the Company on other matters) or any other obligation to the Company with respect to the offering contemplated hereby except the obligations expressly set

forth in this Agreement; (iv) the several Underwriters and their respective affiliates may be engaged in a broad range of transactions that involve interests that differ from those of the Company and that the several Underwriters have no obligation to disclose any of such interests by virtue of any advisory, agency or fiduciary relationship; and (v) the Underwriters have not provided any legal, accounting, regulatory or tax advice with respect to the offering contemplated hereby and the Company has consulted its own legal, accounting, regulatory and tax advisors to the extent it deemed appropriate.

     This Agreement supersedes all prior agreements and understandings (whether written or oral) between the Company and the several Underwriters, or any of them, with respect to the subject matter hereof. The Company hereby waives and releases, to the fullest extent permitted by law, any claims that the Company may have against the several Underwriters with respect to any breach or alleged breach of agency or fiduciary duty.

     Section 13. Research Analyst Independence. The Company acknowledges that the Underwriters’ research analysts and research departments are required to be independent from their respective investment banking divisions and are subject to certain regulations and internal policies, and that such Underwriters’ research analysts may hold views and make statements or investment recommendations and/or publish research reports with respect to the Company and/or the offering that differ from the views of their respective investment banking divisions. The Company hereby waives and releases, to the fullest extent permitted by law, any claims that the Company may have against the Underwriters with respect to any conflict of interest that may arise from the fact that the views expressed by their independent research analysts and research departments may be different from or inconsistent with the views or advise communicated to the Company by such Underwriters’ investment banking divisions. The Company acknowledges that each of the Underwriters is a full service securities firm and as such from time to time, subject to applicable securities laws, may effect transactions for its own account or the account of its customers and hold long or short positions in debt or equity securities of the companies that may be the subject of the transactions contemplated by this Agreement.

     Section 14. Representations and Indemnities to Survive Delivery. The respective indemnities, agreements, representations, warranties and other statements of the Company, its officers and the several Underwriters set forth in or made pursuant to this Agreement (i) will remain operative and in full force and effect, regardless of any investigation, or statement as to the results thereof, made by or on behalf of any Underwriter, the officers or employees of any Underwriter, or any person controlling any Underwriter, the Company, or any of the officers or employees of the Company, or any person controlling the Company, as the case may be, and (ii) will survive delivery of and payment for the Shares sold hereunder and any termination of this Agreement.

     Section 15. Notices. All communications hereunder shall be in writing and shall be mailed, hand delivered or telecopied and confirmed to the parties hereto as follows:

If to the Underwriters:

		Morgan Stanley & Co. LLC
		1585 Broadway

		New York, New York 10036
		Attention: Equity Syndicate Desk

     with a copy to:

		Shearman & Sterling LLP
		599 Lexington Avenue
		New York, New York 10022-6069
		Facsimile: (646)  ###-###-####
		Attention: Jason Lehner

     If to the Company:

		Arch Coal, Inc.
		One CityPlace Drive
		Suite 300
		St. Louis, Missouri 63141
		Facsimile: (314)  ###-###-####
		Attention: General Counsel

     with a copy to:

		Simpson Thacher & Bartlett LLP
		425 Lexington Avenue
		New York, New York 10017-3954
		Facsimile: (212)  ###-###-####
		Attention: Risë B. Norman

     Any party hereto may change the address or facsimile number for receipt of communications by giving written notice to the others.

     Section 16. Successors. This Agreement will inure to the benefit of and be binding upon the parties hereto, including any substitute Underwriters pursuant to Section 10 hereof, and to the benefit of the directors (or managers, as the case may be), officers, employees, agents and controlling persons referred to in Sections 8 and 9, and in each case their respective successors, and no other person will have any right or obligation hereunder. The term “successors” shall not include any purchaser of the Shares as such from any of the Underwriters merely by reason of such purchase.

     Section 17. Partial Unenforceability. The invalidity or unenforceability of any Section, paragraph or provision of this Agreement shall not affect the validity or enforceability of any other Section, paragraph or provision hereof. If any Section, paragraph or provision of this Agreement is for any reason determined to be invalid or unenforceable, there shall be deemed to be made such minor changes (and only such minor changes) as are necessary to make it valid and enforceable.

     Section 18. Governing Law Provisions. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF NEW YORK APPLICABLE TO AGREEMENTS MADE AND TO BE PERFORMED IN THAT STATE.

     (a) Consent to Jurisdiction. Any legal suit, action or proceeding arising out of or based upon this Agreement or the transactions contemplated hereby (“Related Proceedings”) may be instituted in the federal courts of the United States of America located in the City and County of New York or the courts of the State of New York in each case located in the City and County of New York (collectively, the “Specified Courts”), and each party irrevocably submits to the exclusive jurisdiction (except for suits, actions, or proceedings instituted in regard to the enforcement of a judgment of any Specified Court in a Related Proceeding a “Related Judgment”, as to which such jurisdiction is non-exclusive) of the Specified Courts in any Related Proceeding. Service of any process, summons, notice or document by mail to such party’s address set forth above shall be effective service of process for any Related Proceeding brought in any Specified Court. The parties irrevocably and unconditionally waive any objection to the laying of venue of any Specified Proceeding in the Specified Courts and irrevocably and unconditionally waive and agree not to plead or claim in any Specified Court that any Related Proceeding brought in any Specified Court has been brought in an inconvenient forum.

     Section 19. General Provisions. This Agreement constitutes the entire agreement of the parties to this Agreement and supersedes all prior written or oral and all contemporaneous oral agreements, understandings and negotiations with respect to the subject matter hereof. This Agreement may be executed in two or more counterparts, each one of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument. This Agreement may not be amended or modified unless in writing by all of the parties hereto, and no condition herein (express or implied) may be waived unless waived in writing by each party whom the condition is meant to benefit. The Section headings herein are for the convenience of the parties only and shall not affect the construction or interpretation of this Agreement.

     If the foregoing is in accordance with your understanding of our agreement, kindly sign and return to the Company the enclosed copies hereof, whereupon this instrument, along with all counterparts hereof, shall become a binding agreement in accordance with its terms.

		Very truly yours,
		Arch Coal, Inc.
		By:		/s/ John T. Drexler    Name: John T. Drexler
				Title: Senior Vice President and Chief Financial Officer

The foregoing Underwriting Agreement is hereby confirmed and accepted by the Representatives as of the date first above written.

Morgan Stanley & Co. LLC
PNC Capital Markets LLC
Merrill Lynch, Pierce, Fenner & Smith
                     Incorporated
Citigroup Global Markets Inc.

Acting as Representatives of the
several Underwriters named in
the attached Schedule A.

		By:		Morgan Stanley & Co. LLC
		By:		/s/ Evan Darnast    Name: Evan Darnast
				Title: Managing Director
		By:		PNC Capital Markets LLC
		By:		/s/ Robert W. Thomas    Name: Robert W. Thomas
				Title: Managing Director
		By:		Merrill Lynch, Pierce, Fenner & Smith
				Incorporated
		By:		/s/ Keith Hennessey    Name: Keith Hennessey
				Title: Managing Director
		By:		Citigroup Global Markets Inc.
		By:		/s/ Matthew J. Konnsy    Name: Matthew J. Konnsy
				Title: Vice President — Global Banking

SCHEDULE A

		Number of
		Firm Shares
		to be
Underwriters		Purchased
Morgan Stanley & Co. LLC			22,176,000
PNC Capital Markets LLC			9,504,000
Merrill Lynch, Pierce, Fenner & Smith Incorporated			3,360,000
Citigroup Global Markets Inc.			3,360,000
BMO Capital Markets Corp.			960,000
Credit Suisse Securities (USA) LLC			960,000
RBS Securities Inc.			960,000
Wells Fargo Securities, LLC			960,000
Mitsubishi UFJ Securities (USA), Inc.			720,000
Santander Investment Securities Inc.			816,000
Credit Agricole Securities (USA) Inc.			720,000
Natixis Bleichroeder LLC			720,000
Piper Jaffray & Co.			720,000
FBR Capital Markets & Co.			480,000
ING Financial Markets LLC			336,000
Stifel, Nicolaus & Company, Incorporated			288,000
BB&T Capital Markets, a division of Scott & Stringfellow, LLC			240,000
Howard Weil Incorporated			240,000
Macquarie Capital (USA) Inc.			240,000
Simmons & Company International			240,000
Total			48,000,000

SCHEDULE B

June [•], 2011

Morgan Stanley & Co. LLC
PNC Capital Markets LLC
Merrill Lynch, Pierce, Fenner & Smith
     Incorporated
Citigroup Global Markets Inc.

     As Representatives of the Underwriters

		c/o		Morgan Stanley & Co. LLC
				1585 Broadway
				New York, New York 10036

Re:       Arch Coal, Inc. (the “Company”)

Ladies and Gentlemen:

     The undersigned is an owner of record or beneficially of certain shares of Common Stock of the Company (“Common Stock”) or securities convertible into or exchangeable or exercisable for Common Stock. The Company proposes to carry out a public offering of Common Stock (the “Offering”) for which you will act as the representatives of the underwriters. The undersigned recognizes that the Offering will be of benefit to the undersigned and will benefit the Company. The undersigned acknowledges that you and the other underwriters are relying on the representations and agreements of the undersigned contained in this letter in carrying out the Offering and in entering into purchase arrangements with the Company with respect to the Offering.

     In consideration of the foregoing, the undersigned hereby agrees that the undersigned will not, (and will cause any spouse or immediate family member of the spouse or the undersigned living in the undersigned’s household not to), without the prior written consent of Morgan Stanley & Co. LLC (which consent may be withheld in their sole discretion), directly or indirectly, sell, offer, contract or grant any option to sell (including without limitation any short sale), pledge, transfer, establish an open “put equivalent position” or liquidate or decrease a “call equivalent position” within the meaning of Rule 16a-1(h) under the Securities Exchange Act of 1934, as amended, or otherwise dispose of or transfer (or enter into any transaction which is designed to, or might reasonably be expected to, result in the disposition of) including the filing (or participation in the filing of) of a registration statement with the Securities and Exchange Commission in respect of, any shares of Common Stock, options or warrants to acquire shares of Common Stock, or securities exchangeable or exercisable for or convertible into shares of Common Stock currently or hereafter owned either of record or beneficially (as defined in Rule 13d-3 under the Securities Exchange Act of 1934, as amended) by the undersigned (or such spouse or family member), or publicly announce an intention to do any of the foregoing, for a period

commencing on the date hereof and continuing through the close of trading on the date 90 days after the date of the Prospectus (the “Lock-Up Period”).

     If (i) the Company issues an earnings release or material news, or a material event relating to the Company occurs, during the last 17 days of the Lock-Up Period, or (ii) prior to the expiration of the Lock-Up Period, the Company announces that it will release earnings results during the 16-day period beginning on the last day of the Lock-Up Period, the restrictions imposed by this agreement shall continue to apply until the expiration of the 18-day period beginning on the date of the issuance of the earnings release or the occurrence of the material news or material event, unless Morgan Stanley & Co. LLC waives, in writing, such extension. The undersigned hereby acknowledges that the Company has agreed in the Underwriting Agreement to provide written notice of any event that would result in an extension of the Lock-Up Period pursuant to the previous paragraph to the undersigned (in accordance with Section 15 of the Underwriting Agreement) and agrees that any such notice properly delivered will be deemed to have given to, and received by, the undersigned. The undersigned hereby further agrees that, prior to engaging in any transaction or taking any other action that is subject to the terms of this agreement during the period from the date of this agreement to and including the 34th day following the expiration of the initial Lock-Up Period, it will give notice thereof to the Company and will not consummate such transaction or take any such action unless it has received written confirmation from the Company that the Lock-Up Period (as such may have been extended pursuant to the previous paragraph) has expired. The undersigned also agrees and consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of shares of Common Stock or securities convertible into or exchangeable or exercisable for Common Stock held by the undersigned except in compliance with the foregoing restrictions.

     Notwithstanding the foregoing, the undersigned may transfer shares of Common Stock (i) as a bona fide gift; (ii) by will or intestate succession upon the death of the undersigned; (iii) to any trust, family partnership or similar entity formed for estate planning purposes for the direct or indirect benefit of the undersigned; or (iv) to effect a cashless exercise of options to purchase Common Stock expiring during the Lock-Up Period; provided that in the case of any transfer pursuant to clauses (i), (ii) or (iii), (x) no public filing or announcement shall be required or made pursuant to such transfer, and (y) each transferee shall agree to be bound by the lock-up restrictions set forth herein.

     The undersigned agrees and consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of shares of Common Stock or securities convertible into or exchangeable or exercisable for Common Stock held by the undersigned except in compliance with the foregoing restrictions.

     This agreement is irrevocable and will be binding on the undersigned and the respective successors, heirs, personal representatives, and assigns of the undersigned.

     Printed Name of Holder

By:
		Signature
		Printed Name of Person Signing
		(and indicate capacity of person signing if signing
		as custodian, trustee, or on behalf of an entity)

Schedule C

Issuer Free Writing Prospectuses

     None