STUSCO Purchase Contract No.: LPS790268 Dated: May 1, 2006 Amendment No.: Resaca Exploitation, LP. Contract No.: October 19, 2006 Exhibit A RESACA Contact: Ms. Mary Frances Deibert STUSCO Contact: Terry Newman Phone: 713 ###-###-#### Phone: 432 ###-###-####

Exhibit 10.63

CONFIDENTIAL TREATMENT HAS BEEN REQUESTED BY RESACA EXPLOITATION, INC. FOR CERTAIN PORTIONS OF THIS DOCUMENT.  CONFIDENTIAL PORTIONS HAVE BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.  OMITTED PORTIONS ARE INDICATED IN THIS AGREEMENT WITH “*****”.

Ms. Deibert:

This Agreement is made between SHELL TRADING (US) COMPANY (STUSCO), “Buyer” and RESACA EXPLOITATION, LP. (RESACA), “Seller” whereby each party agrees to sell and deliver and each party agrees to purchase and receive crude oil or condensate under the terms and conditions set forth in Exhibit A and Conoco Inc.’s General Provisions, attached hereto and made a part hereof.

Please confirm by fax to ###-###-#### that the above accurately records the terms and conditions of our agreement. If a reply is not received within ten (10) business days it will constitute acceptance of the terms stated herein.

Exhibit A

RESACA’S Sale and Delivery is STUSCO:

QUALITY: West Texas Intermediate type crude oil and West Texas Sour type crude oil.

QUANTITY: Equal to production from the lease(s) listed on Attachment “I”, approximately 125 bpd.

DELIVERY: Title and custody shall transfer from RESACA to STUSCO at the lease into STUSCO’S designated transporters trucks.

PRICE: ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****

***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****

***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****(1)

PAYMENT: Due on or before the 20th of the month following the month of delivery

TERM: May 1, 2006 through May 31, 2006 and continuing month to month thereafter until the first of the month following either party’s thirty (30) days advance written notice of termination.

ASSIGNMENT: The Contract shall extend to and be binding upon the successors and assigns of the Parties, but neither this Contract nor any part, specifically including the right to receive payment, shall be assigned or transferred by either Party or by law without the prior written consent of the other Party, which shall not be unreasonably withheld, and any assignment or transfer made by either Party without the other Party’s written consent need not be recognized by and shall not be binding upon the other Party.

LIMITATION OF LIABILITY: Neither party shall be liable for indirect, special, or consequential damages.

(1) CONFIDENTIAL TREATMENT HAS BEEN REQUESTED BY RESACA EXPLOITATION, INC. FOR CERTAIN PORTIONS OF THIS DOCUMENT.  CONFIDENTIAL PORTIONS HAVE BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.  OMITTED PORTIONS ARE INDICATED IN THIS AGREEMENT WITH “*****”.

Dated: May 1, 2006

Amendment No.:

Resaca Exploitation, LP. Contract No.:

HAZARD COMMUNICATION: Seller shall provide its Material Safety Data Sheet (“MSDS”) to Buyer. Buyer acknowledges the hazards and risks in handling and using crude oil. Buyer shall read the MSDS and advise its employees, its affiliates and appropriate contractors who may purchase or come into contact with such crude oil, about the hazards of crude oil, as well as the precautionary procedures for handling said crude oil, which are set forth in such MSDS and any supplementary MSDS or written warning(s) which Seller may provide to Buyer from time to time. If seller fails to provide the MSDS, Buyer will provide MSDS annually to its relevant employees, affiliates, and appropriate contractors.

SPECIAL PROVISIONS: None

(2) CONFIDENTIAL TREATMENT HAS BEEN REQUESTED BY RESACA EXPLOITATION, INC. FOR CERTAIN PORTIONS OF THIS DOCUMENT.  CONFIDENTIAL PORTIONS HAVE BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.  OMITTED PORTIONS ARE INDICATED IN THIS AGREEMENT WITH “*****”.

1

Shell Trading (US) Company

Two Houston Center

909 Fannin Street

Houston, TX 77010-1014

Facsimile: (713) 246 8682

Please note that all contractual correspondence for this deal and all future deals between our companies must be directed to the following address. STUSCO will not be held responsible for delays resulting from correspondence sent to any other place.

As agreed between the respective traders at the time of negotiation. STUSCO is the documenting party and this Contract is the governing document and any contract or contract confirmation generated by the Counterparty shall be used solely for the purpose of confirming detail, e.g., price, term, quantity, quality, and time, place and method of delivery agreed to at the time of negotiation.

Confirming agreement between Terry Newman of Shell Trading (US) Company and Mary Frances Delbert of Resaca Operating Company., whereby we mutually agree to amend the referenced Contract as follows:

CONTRACT REF. NO. LPS790268 AMENDMENT 004

Effective AUGUST 1, 2009 PRICE CHANGE as listed on Attachment 1.

All other terms and conditions remain unchanged.

CONTRACTUAL CONTACT:

Please ensure that you quote our contract ref. LPS790268 in all correspondence.

Please confirm by fax to ###-###-#### that the foregoing is a full and accurate record of the agreement reached between us. If a reply is not received within TEN (10) business days it will constitute acceptance of the terms herein.

Regards,

Shell Trading (US) Company

PRICE CODE REFERENCE SHEET(3)

***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****

***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****

***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****

***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****

***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****

***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****

***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****

***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****

***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****

***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** *****(3)

(3) CONFIDENTIAL TREATMENT HAS BEEN REQUESTED BY RESACA EXPLOITATION, INC. FOR CERTAIN PORTIONS OF THIS DOCUMENT.  CONFIDENTIAL PORTIONS HAVE BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.  OMITTED PORTIONS ARE INDICATED IN THIS AGREEMENT WITH “*****”.

(4) CONFIDENTIAL TREATMENT HAS BEEN REQUESTED BY RESACA EXPLOITATION, INC. FOR CERTAIN PORTIONS OF THIS DOCUMENT.  CONFIDENTIAL PORTIONS HAVE BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.  OMITTED PORTIONS ARE INDICATED IN THIS AGREEMENT WITH “*****”.

PAYMENT TERMS

CI = BY STUSCO TO SELLER AFTER RECEIPT OF INV

DA = BY STUSCO TO SELLER

DB = BY STUSCO TO INDIVIDUAL INTEREST OWNERS

MX = BY STUSCO TO SELLER

TAX STATUS

A = STUSCO IS IST PURCHASER, STUSCO WILL COLLECT & REMIT

B = TO BE PAID BY SELLER

C = STUSCO WILL COLLECT AND REMIT APPLICABLE TAXES

D = TO BE PAID BY SELLER

E = PURCHASER REQUIRED TAXES ARE TO BE PAID BY STUSCO