CORPORATE RESOLUTION TO BORROW / GRANTCOLLATERAL

Exhibit 10.1

CORPORATE RESOLUTION TO BORROW / GRANT COLLATERAL

References in the shaded area are for Lender’s use only and do not limit the applicability
of this document to any particular loan or item.
Any item above containing “* * *” has been omitted due to text length limitations.

I, THE UNDERSIGNED, DO HEREBY CERTIFY THAT:

THE CORPORATION’S EXISTENCE.  The complete and correct name of the Corporation is TGC Industries, Inc. (“Corporation”). The Corporation is a corporation for profit which is, and at all times shall be, duly organized, validly existing, and in good standing under and by virtue of the laws of the State of Texas. The Corporation is duly authorized to transact business in all other states in which the Corporation is doing business, having obtained all necessary filings, governmental licenses and approvals for each state in which the Corporation is doing business. Specifically, the Corporation is, and at all times shall be, duly qualified as a foreign corporation in all states in which the failure to so qualify would have a material adverse effect on its business or financial condition. The Corporation has the full power and authority to own its properties and to transact the business in which it is presently engaged or presently proposes to engage. The Corporation maintains an office at 1304 Summit Avenue, Ste. 2, Plano, TX 75074. Unless the Corporation has designated otherwise in writing, the principal office is the office at which the Corporation keeps its books and records. The Corporation will notify Lender prior to any change in the location of The Corporation’s state of organization or any change in The Corporation’s name. The Corporation shall do all things necessary to preserve and to keep in full force and effect its existence, rights and privileges, and shall comply with all regulations, rules, ordinances, statutes, orders and decrees of any governmental or quasi-governmental authority or court applicable to the Corporation and The Corporation’s business activities.

RESOLUTIONS ADOPTED.  At a meeting of the Directors of the Corporation, or if the Corporation is a close corporation having no Board of Directors then at a meeting of the Corporation’s shareholders, duly called and held on                               , at which a quorum was present and voting, or by other duly authorized action in lieu of a meeting, the resolutions set forth in this Resolution were adopted.

OFFICER.  The following named person is an officer of TGC Industries, Inc.:

ACTIONS AUTHORIZED.  The authorized person listed above may enter into any agreements of any nature with Lender, and those agreements will bind the Corporation. Specifically, but without limitation, the authorized person is authorized, empowered, and directed to do the following for and on behalf of the Corporation:

Borrow Money.  To borrow, as a cosigner or otherwise, from time to time from Lender, on such terms as may be agreed upon between the Corporation and Lender, such sum or sums of money as in his or her judgment should be borrowed, without limitation.

Execute Notes.  To execute and deliver to Lender the promissory note or notes, or other evidence of the Corporation’s credit accommodations, on Lender’s forms, at such rates of interest and on such terms as may be agreed upon, evidencing the sums of money so borrowed or any of the Corporation’s indebtedness to Lender, and also to execute and deliver to Lender one or more renewals, extensions, modifications, refinancings, consolidations, or substitutions for one or more of the notes, any portion of the notes, or any other evidence of credit accommodations.

Grant Security.  To mortgage, pledge, transfer, endorse, hypothecate, or otherwise encumber and deliver to Lender any property now or hereafter belonging to the Corporation or in which the Corporation now or hereafter may have an interest, including without limitation all of the Corporation’s real property and all of the Corporation’s personal property (tangible or intangible), as security for the payment of any loans or credit accommodations so obtained, any promissory notes so executed (including any amendments to or modifications, renewals, and extensions of such promissory notes), or any other or further indebtedness of the Corporation to Lender at any time owing, however the same may be evidenced. Such property may be mortgaged, pledged, transferred, endorsed, hypothecated or encumbered at the time such loans are obtained or such indebtedness is incurred, or at any other time or times, and may be either in addition to or in lieu of any property theretofore mortgaged, pledged, transferred, endorsed, hypothecated or encumbered.

Execute Security Documents.  To execute and deliver to Lender the forms of mortgage, deed of trust, pledge agreement, hypothecation agreement, and other security agreements and financing statements which Lender may require and which shall evidence the terms and conditions under and pursuant to which such liens and encumbrances, or any of them, are given; and also to execute and deliver to Lender any other written instruments, any chattel paper, or any other collateral, of any kind or nature, which Lender may deem necessary or proper in connection with or pertaining to the giving of the liens and encumbrances.

Negotiate Items.  To draw, endorse, and discount with Lender all drafts, trade acceptances, promissory notes, or other evidences of indebtedness payable to or belonging to the Corporation or in which the Corporation may have an interest, and either to receive cash for the same or to cause such proceeds to be credited to the Corporation’s account with Lender, or to cause such other disposition of the proceeds derived therefrom as he or she may deem advisable.

Further Acts.  In the case of lines of credit, to designate additional or alternate individuals as being authorized to request advances under such lines, and in all cases, to do and perform such other acts and things, to pay any and all fees and costs, and to execute and deliver such other documents and agreements as the officer may in his or her discretion deem reasonably necessary or proper in order to carry into effect the provisions of this Resolution.

ASSUMED BUSINESS NAMES.  The Corporation has filed or recorded all documents or filings required by law relating to all assumed business names used by the Corporation. Excluding the name of the Corporation, the following is a complete list of all assumed business names under which the Corporation does business: None.

NOTICES TO LENDER.  The Corporation will promptly notify Lender in writing at Lender’s address shown above (or such other addresses as Lender may designate from time to time) prior to any (A) change in the Corporation’s name; (B) change in the Corporation’s assumed business name(s); (C) change in the management of the Corporation; (D) change in the authorized signer(s); (E) change in the Corporation’s principal office address; (F) change in the Corporation’s state of organization; (G) conversion of the Corporation to a new or different type of business entity; or (H) change in any other aspect of the Corporation that directly or indirectly relates to any agreements between the Corporation and Lender. No change in the Corporation’s name or state of organization will take effect until after Lender has received notice.

CERTIFICATION CONCERNING OFFICERS AND RESOLUTIONS.  The officer named above is duly elected, appointed, or employed by or for the Corporation, as the case may be, and occupies the position set opposite his or her respective name. This Resolution now stands of record on the books of the Corporation, is in full force and effect, and has not been modified or revoked in any manner whatsoever.

NO CORPORATE SEAL.  The Corporation has no corporate seal, and therefore, no seal is affixed to this Resolution.

CONTINUING VALIDITY.  Any and all acts authorized pursuant to this Resolution and performed prior to the passage of this Resolution are hereby ratified and approved. This Resolution shall be continuing, shall remain in full force and effect and Lender may rely on it until written notice of its revocation shall have been delivered to Lender and receipt acknowledged by Lender in writing at Lender’s address shown above (or such addresses as Lender may designate from time to time). Any such notice shall not affect any of the Corporation’s agreements or commitments in effect at the time notice is given.

IN TESTIMONY WHEREOF, I have hereunto set my hand and attest that the signature set opposite the name listed above is his or her genuine signature.

I have read all the provisions of this Resolution, and I personally and on behalf of the Corporation certify that all statements and representations made in this Resolution are true and correct. This Corporate Resolution to Borrow / Grant Collateral is dated                                      .

NOTE: If the officer signing this Resolution is designated by the foregoing document as one of the officers authorized to act on the Corporation’s behalf, it is advisable to have this Resolution signed by at least one non-authorized officer of the Corporation.

2

PROMISSORY NOTE

References in the shaded area are for Lender’s use only and do not limit the applicability
of this document to any particular loan or item.

Any item above containing “* * *” has been omitted due to text length limitations.

PROMISE TO PAY.  TGC Industries, Inc. (“Borrower”) promises to pay to Sovereign Bank, N.A. (“Lender”), or order, in lawful money of the United States of America, the principal amount of Three Million Five Hundred Thousand & 00/100 Dollars ($3,500,000.00) or so much as may be outstanding, together with interest on the unpaid outstanding principal balance of each advance. Interest shall be calculated from the date of each advance until repayment of each advance or maturity, whichever occurs first.

CHOICE OF USURY CEILING AND INTEREST RATE.  The interest rate on this Note has been implemented under the “Quarterly Ceiling” as referred to in Section 303.006 of the Texas Finance Code. The terms, including the rate, or index, formula, or provision of law used to compute the rate on the Note, will be subject to revision as to current and future balances, from time to time by notice from Lender in compliance with Section 303.103 of the Texas Finance Code.

PAYMENT.  Borrower will pay this loan in one payment of all outstanding principal plus all accrued unpaid interest on September 16, 2006. In addition, Borrower will pay regular monthly payments of all accrued unpaid interest due as of each payment date, beginning October 16, 2005, with all subsequent interest payments to be due on the same day of each month after that. Unless otherwise agreed or required by applicable law, payments will be applied first to any accrued unpaid interest; and then to principal. The annual interest rate for this Note is computed on a 365/360 basis; that is, by applying the ratio of the annual interest rate over a year of 360 days, multiplied by the outstanding principal balance, multiplied by the actual number of days the principal balance is outstanding, unless such calculation would result in a usurious rate, in which case interest shall be calculated on a per diem basis of a year of 365 or 366 days, as the case may be. Borrower will pay Lender at Lender’s address shown above or at such other place as Lender may designate in writing. Notwithstanding any other provision of this Note, Lender will not charge interest on any undisbursed loan proceeds. No scheduled payment, whether of principal or interest or both, will be due unless sufficient loan funds have been disbursed by the scheduled payment date to justify the payment.

VARIABLE INTEREST RATE.  The interest rate on this Note is subject to change from time to time based on changes in an independent index which is the Sovereign Bank, N.A. Prime Rate as determined, currently equal to Wall Street Journal Prime Rate as quoted in the Southwestern Addition of the Wall Street Journal (the “Index”). The index is not necessarily the lowest rate charged by Lender on its loans. If the index becomes unavailable during the term of this loan, Lender may designate a substitute index after notice to Borrower. Lender will tell Borrower the current index rate upon Borrower’s request. The interest rate change will not occur more often than each Day. Borrower understands that Lender may make loans based on other rates as well. The index currently is 6.500% per annum. The interest rate to be applied prior to maturity to the unpaid principal balance of this Note will be at a rate of 1.000 percentage point over the index, resulting in an initial rate of 7.500% per annum. NOTICE: Under no circumstances will the interest rate on this Note be more than the maximum rate allowed by applicable law. For purposes of this Note, the “maximum rate allowed by applicable law” means the greater of (A) the maximum rate of interest permitted under federal or other law applicable to the indebtedness evidenced by this Note, or (B) the “Quarterly Ceiling” as referred to in Section 303.006 of the Texas Finance Code.

PREPAYMENT.  Borrower may pay without penalty all or a portion of the amount owed earlier than it is due. Prepayment in full shall consist of payment of the remaining unpaid principal balance together with all accrued and unpaid interest and all other amounts, costs and expenses for which Borrower is responsible under this Note or any other agreement with Lender pertaining to this loan, and in no event will Borrower ever be required to pay any unearned interest. Early payments will not, unless agreed to by Lender in writing, relieve Borrower of Borrower’s obligation to continue to make payments of accrued unpaid interest. Rather, early payments will reduce the principal balance due. Borrower agrees not to send Lender payments marked “paid in full”, “without recourse”, or similar language. If Borrower sends such a payment, Lender may accept it without losing any of Lender’s rights under this Note, and Borrower will remain obligated to pay any further amount owed to Lender. All written communications concerning disputed amounts, including any check or other payment instrument that indicates that the payment constitutes “payment in full” of the amount owed or that is tendered with other conditions or limitations or as full satisfaction of a disputed amount must be mailed or delivered to: Sovereign Bank, N.A., 7301 North State Highway 161 Irving, TX 75039.

POST MATURITY RATE.  The Post Maturity Rate on this Note is the lesser of the maximum rate allowed by law or the variable interest rate in effect at the time of final maturity. Borrower will pay interest on all sums due after final maturity, whether by acceleration or otherwise, at that rate.

DEFAULT.  Each of the following shall constitute an event of default (“Event of Default”) under this Note:

Payment Default.  Borrower fails to make any payment when due under this Note.

Other Defaults.  Borrower fails to comply with or to perform any other term, obligation, covenant or condition contained in this Note or in any of the related documents or to comply with or to perform any term, obligation, covenant or condition contained in any other agreement between Lender and Borrower.

Default in Favor of Third Parties.  Borrower or any Grantor defaults under any loan, extension of credit, security agreement, purchase or sales agreement, or any other agreement, in favor of any other creditor or person that may materially affect any of Borrower’s property or Borrower’s ability to repay this Note or perform Borrower’s obligations under this Note or any of the related documents.

False Statements.  Any warranty, representation or statement made or furnished to Lender by Borrower or on Borrower’s behalf under this Note or the related documents is false or misleading in any material respect, either now or at the time made or furnished or becomes false or misleading at any time thereafter.

Insolvency.  The dissolution or termination of Borrower’s existence as a going business, the insolvency of Borrower, the appointment of a receiver for any part of Borrower’s property, any assignment for the benefit of creditors, any type of creditor workout, or the commencement of any proceeding under any bankruptcy or insolvency laws by or against Borrower.

Creditor or Forfeiture Proceedings.  Commencement of foreclosure or forfeiture proceedings, whether by judicial proceeding, self-help, repossession or any other method, by any creditor of Borrower or by any governmental agency against any collateral securing the loan. This includes a garnishment of any of Borrower’s accounts, including deposit accounts, with Lender. However, this Event of Default shall not apply if there is a good faith dispute by Borrower as to the validity or reasonableness of the claim which is the basis of the creditor or

forfeiture proceeding and if Borrower gives Lender written notice of the creditor or forfeiture proceeding and deposits with Lender monies or a surety bond for the creditor or forfeiture proceeding, in an amount determined by Lender, in its sole discretion, as being an adequate reserve or bond for the dispute.

Events Affecting Guarantor.  Any of the preceding events occurs with respect to any guarantor, endorser, surety, or accommodation party of any of the indebtedness or any guarantor, endorser, surety, or accommodation party dies or becomes incompetent, or revokes or disputes the validity of, or liability under, any guaranty of the indebtedness evidenced by this Note.

Change In Ownership.  Any change in ownership of twenty-five percent (25%) or more of the common stock of Borrower.

Adverse Change.  A material adverse change occurs in Borrower’s financial condition, or Lender believes the prospect of payment or performance of this Note is impaired.

Insecurity.  Lender in good faith believes itself insecure.

LENDER’S RIGHTS.  Upon default, Lender may declare the entire indebtedness, including the unpaid principal balance on this Note, all accrued unpaid interest, and all other amounts, costs and expenses for which Borrower is responsible under this Note or any other agreement with Lender pertaining to this loan, immediately due, without notice, and then Borrower will pay that amount.

ATTORNEYS’ FEES; EXPENSES.  Lender may hire an attorney to help collect this Note if Borrower does not pay, and Borrower will pay Lender’s reasonable attorneys’ fees. Borrower also will pay Lender all other amounts Lender actually incurs as court costs, lawful fees for filing, recording, releasing to any public office any instrument securing this Note; the reasonable cost actually expended for repossessing, storing, preparing for sale, and selling any security; and fees for noting a lien on or transferring a certificate of title to any motor vehicle offered as security for this Note, or premiums or identifiable charges received in connection with the sale of authorized insurance.

GOVERNING LAW.  This Note will be governed by federal law applicable to Lender and, to the extent not preempted by federal law, the laws of the State of Texas without regard to its conflicts of law provisions. This Note has been accepted by Lender in the State of Texas.

CHOICE OF VENUE.  If there is a lawsuit, and if the transaction evidenced by this Note occurred in Dallas County, Borrower agrees upon Lender’s request to submit to the jurisdiction of the courts of Dallas County, State of Texas.

DISHONORED CHECK CHARGE.  Borrower will pay a processing fee of $30.00 if any check given by Borrower to Lender as a payment on this loan is dishonored.

RIGHT OF SETOFF.  To the extent permitted by applicable law, Lender reserves a right of setoff in all Borrower’s accounts with Lender (whether checking, savings, or some other account). This includes all accounts Borrower holds jointly with someone else and all accounts Borrower may open in the future. However, this does not include any IRA or Keogh accounts, or any trust accounts for which setoff would be prohibited by law. Borrower authorizes Lender, to the extent permitted by applicable law, to charge or setoff all sums owing on the indebtedness against any and all such accounts.

COLLATERAL.  Borrower acknowledges this Note is secured by Assignment of Accounts Receivables and General Intangibles.

LINE OF CREDIT.  This Note evidences a revolving line of credit. Advances under this Note, as well as directions for payment from Borrower’s accounts, may be requested orally or in writing by Borrower or by an authorized person. Lender may, but need not, require that all oral requests be confirmed in writing. Borrower agrees to be liable for all sums either: (A) advanced in accordance with the instructions of an authorized person or (B) credited to any of Borrower’s accounts with Lender. The unpaid principal balance owing on this Note at any time may be evidenced by endorsements on this Note or by Lender’s internal records, including daily computer print-outs. Lender will have no obligation to advance funds under this Note if: (A) Borrower or any guarantor is in default under the terms of this Note or any agreement that Borrower or any guarantor has with Lender, including any agreement made in connection with the signing of this Note; (B) Borrower or any guarantor ceases doing business or is insolvent; (C) any guarantor seeks, claims or otherwise attempts to limit, modify or revoke such guarantor’s guarantee of this Note or any other loan with Lender; (D) Borrower has applied funds provided pursuant to this Note for purposes other than those authorized by Lender; or (E) Lender in good faith believes itself insecure.  This revolving line of credit shall not be subject to Ch. 346 of the Texas Finance Code.

RENEWAL AND EXTENSION.  This Note is given in renewal and extension and not in novation of the following described indebtedness:  The Promissory Note dated April 26, 2005 in the amount of Five Hundred Thousand & 00/100 ($500,000.00), from Borrower to Lender.

SUCCESSOR INTERESTS.  The terms of this Note shall be binding upon Borrower, and upon Borrower’s heirs, personal representatives, successors and assigns, and shall inure to the benefit of Lender and its successors and assigns.

GENERAL PROVISIONS.  If any part of this Note cannot be enforced, this fact will not affect the rest of the Note. Borrower does not agree or intend to pay, and Lender does not agree or intend to contract for, charge, collect, take, reserve or receive (collectively referred to herein as “charge or collect”), any amount in the nature of interest or in the nature of a fee for this loan, which would in any way or event (including demand, prepayment, or acceleration) cause Lender to charge or collect more for this loan than the maximum Lender would be permitted to charge or collect by federal law or the law of the State of Texas (as applicable). Any such excess interest or unauthorized fee shall, instead of anything stated to the contrary, be applied first to reduce the principal balance of this loan, and when the principal has been paid in full, be refunded to Borrower. The right to accelerate maturity of sums due under this Note does not include the right to accelerate any interest which has not otherwise accrued on the date of such acceleration, and Lender does not intend to charge or collect any unearned interest in the event of acceleration. All sums paid or agreed to be paid to Lender for the use, forbearance or detention of sums due hereunder shall, to the extent permitted by applicable law, be amortized, prorated, allocated and spread throughout the full term of the loan evidenced by this Note until payment in full so that the rate or amount of interest on account of the loan evidenced hereby does not exceed the applicable usury ceiling. Lender may delay or forgo enforcing any of its rights or remedies under this Note without losing them. Borrower and any other person who signs, guarantees or endorses this Note, to the extent allowed by law, waive presentment, demand for payment, notice of dishonor, notice of intent to accelerate the maturity of this Note, and notice of acceleration of the maturity of this Note. Upon any change in the terms of this Note, and unless otherwise expressly stated in writing, no party who signs this Note, whether as maker, guarantor, accommodation maker or endorser, shall be released from liability. All such parties agree that Lender may renew or extend (repeatedly and for any length of time) this loan or release any party or guarantor or collateral; or impair, fail to realize upon or perfect Lender’s security interest in the collateral without the consent of or notice to anyone. All such parties also agree that Lender may modify this loan without the consent of or notice to anyone other than the party with whom the modification is made. The obligations under this Note are joint and several.

2

PRIOR TO SIGNING THIS NOTE, BORROWER READ AND UNDERSTOOD ALL THE PROVISIONS OF THIS NOTE, INCLUDING THE VARIABLE INTEREST RATE PROVISIONS. BORROWER AGREES TO THE TERMS OF THE NOTE.

BORROWER ACKNOWLEDGES RECEIPT OF A COMPLETED COPY OF THIS PROMISSORY NOTE.

BORROWER:

TGC INDUSTRIES, INC.

LENDER:

SOVEREIGN BANK, N.A.

3

NOTICE OF FINAL AGREEMENT

References in the shaded area are for Lender’s use only and do not limit the applicability
of this document to any particular loan or item.

Any item above containing “* * *” has been omitted due to text length limitations.

THE WRITTEN LOAN AGREEMENT REPRESENTS THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

As used in this Notice, the following terms have the following meanings:

Loan. The term “Loan” means the following described loan: B non-precomputed Variable Rate Nondisclosable Revolving Line of Credit Loan to a Corporation for $3,500,000.00 due on September 16, 2006. The reference rate (Sovereign Bank, N.A. Prime Rate as determined, currently equal to Wall Street Journal Prime Rate as quoted in the Southwestern Addition of the Wall Street Journal, currently 6,500%) is added to the margin of 1.000%, resulting in an initial rate of 7,500. This is a secured renewal of the following described indebtedness: The Promissory Note dated April 26, 2005 in the amount of Five Hundred Thousand & 00/100 ($500,000.00), from Borrower to Lender .

Loan Agreement. The term “Loan Agreement” means one or more promises, promissory notes, agreements, undertakings, security agreements, deeds of trust or other documents, or commitments, or any combination of those actions or documents, relating to the Loan, including without limitation the following:

LOAN DOCUMENTS

Parties.  The term “Parties” means Sovereign Bank, N.A. and any and all entities or Individuals who are obligated to repay the loan or have pledged property as security for the Loan, including without limitation the following:

This Notice of Final Agreement is given by Sovereign Bank, N.A. pursuant to Section 26.02 of the Texas Business and Commerce Code. Each Party who signs below, other than Sovereign Bank, N.A., acknowledges, represents, and warrants to Sovereign Bank, N.A. that it has received, read and understood this Notice of Final Agreement. This Notice is dated September 16, 2005.

BORROWER:

TGC INDUSTRIES, INC.

LENDER:

SOVEREIGN BANK, N.A.

[ILLEGIBLE]