PETROHAWK ENERGY CORPORATION 6.25% SENIOR NOTES DUE 2019 PURCHASE AGREEMENT

Exhibit 10.1

Execution Version

$600,000,000

PETROHAWK ENERGY CORPORATION

6.25% SENIOR NOTES DUE 2019

PURCHASE AGREEMENT

May 17, 2011

▇▇▇▇▇ FARGO SECURITIES, LLC

As Representative of the several

Initial Purchasers named in Schedule I attached hereto,

c/▇ ▇▇▇▇▇ Fargo Securities, LLC

▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇

▇▇▇▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇

Ladies and Gentlemen:

Petrohawk Energy Corporation, a Delaware corporation (the “Company”), proposes, upon the terms and conditions set forth in this agreement (this “Agreement”), to issue and sell to ▇▇▇▇▇ Fargo Securities, LLC (the “Representative”) and the other initial purchasers named in Schedule I hereto (collectively, the “Initial Purchasers”), $600 million in aggregate principal amount of its 6.25% Senior Notes due 2019 (the “Notes”). The Notes will (i) have terms and provisions that are summarized in the Offering Memorandum (as defined below) and (ii) are to be issued pursuant to an Indenture (the “Indenture”) to be entered into by and among the Company, the Guarantors (as defined below) and U.S. Bank National Association, as trustee (the “Trustee”). The Company’s obligations under the Notes, including the due and punctual payment of interest on the Notes, will be unconditionally guaranteed (the “Guarantees”) by the guarantors listed in Schedule II hereto (together the “Guarantors”). As used herein, the term “Notes” shall include the Guarantees, unless the context otherwise requires. This is to confirm the agreement concerning the purchase of the Notes from the Company by the Initial Purchasers.

1. Purchase and Resale of the Notes. The Notes will be offered and sold to the Initial Purchasers without registration under the Securities Act of 1933, as amended (the “Securities Act”), in reliance on an exemption pursuant to Section 4(2) under the Securities Act. The Company and the Guarantors have prepared a preliminary offering memorandum, dated May 17, 2011 (the “Preliminary Offering Memorandum”), a pricing term sheet substantially in the form attached hereto as Schedule III (the “Pricing Term Sheet”) setting forth the terms of the Notes omitted from the Preliminary Offering Memorandum, and an offering memorandum, dated May 17, 2011 (the “Offering Memorandum”), setting forth information regarding the Company, the Guarantors, the Notes, the Exchange Notes (as defined herein), the Guarantees and the Exchange Guarantees (as defined herein). The Preliminary Offering Memorandum, as supplemented and amended as of the Applicable Time (as defined below), together with the

Pricing Term Sheet and any of the documents listed on Schedule IV(a) hereto are collectively referred to as the “Pricing Disclosure Package.” The Company and the Guarantors hereby confirm that they have authorized the use of the Pricing Disclosure Package and the Offering Memorandum in connection with the offering and resale of the Notes by the Initial Purchasers. “Applicable Time” means 5:50 p.m. (New York City time) on the date of this Agreement.

Any reference to the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum shall be deemed to refer to and include the Company’s most recent Annual Report on Form 10-K for the fiscal year ended December 31, 2010, Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2011 and all documents for subsequent periods and dates filed with the United States Securities and Exchange Commission (the “Commission”) pursuant to Section 13(a) or 15(d) of the United States Securities Exchange Act of 1934, as amended (the “Exchange Act”), on or prior to the date of the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum, as the case may be, and all documents otherwise incorporated by reference into the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum. Any reference to the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum, as the case may be, as amended or supplemented, as of any specified date, shall be deemed to include (i) any documents filed with the Commission pursuant to Section 13(a) or 15(d) of the Exchange Act after the date of the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum, as the case may be, and prior to such specified date and all documents otherwise incorporated by reference into the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum prior to such specified date. All documents filed under the Exchange Act and so deemed to be included in the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum, as the case may be, or any amendment or supplement thereto, are hereinafter called the “Exchange Act Reports.” The Exchange Act Reports, when they were or are filed with the Commission, conformed or will conform in all material respects to the applicable requirements of the Exchange Act and the applicable rules and regulations of the Commission thereunder.

It is understood and acknowledged that upon original issuance thereof, and until such time as the same is no longer required under the applicable requirements of the Securities Act, the Notes (and all securities issued in exchange therefor or in substitution thereof) shall bear the following legend (along with such other legends as the Initial Purchasers and their counsel deem necessary):

“THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR ANY STATE SECURITIES LAWS. NEITHER THIS SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF (1) REPRESENTS THAT (A) IT IS A “QUALIFIED INSTITUTIONAL BUYER” (AS DEFINED IN RULE 144A UNDER THE

SECURITIES ACT (“RULE 144A”)), OR (B) IT IS A NON-U.S. PURCHASER AND IS ACQUIRING THIS SECURITY IN AN OFFSHORE TRANSACTION WITHIN THE MEANING OF REGULATION S UNDER THE SECURITIES ACT, PURSUANT TO RULE 904 OF REGULATION S, AND (2) AGREES TO OFFER, SELL OR OTHERWISE TRANSFER SUCH SECURITY, PRIOR TO THE DATE WHICH IS ONE YEAR (OR SUCH SHORTER PERIOD AS MAY BE PRESCRIBED BY RULE 144(d) (OR ANY SUCCESSOR PROVISION THEREOF) UNDER THE SECURITIES ACT) AFTER THE LATER OF THE ORIGINAL ISSUE DATE HEREOF (OR ANY PREDECESSOR OF THIS SECURITY) AND THE LAST DATE ON WHICH THE COMPANY OR ANY AFFILIATE OF THE COMPANY WAS THE OWNER OF THIS SECURITY (OR ANY PREDECESSOR OF SUCH SECURITY), ONLY (A) TO THE COMPANY OR ANY OF ITS SUBSIDIARIES, (B) PURSUANT TO A REGISTRATION STATEMENT WHICH HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT, (C) FOR SO LONG AS THE SECURITIES ARE ELIGIBLE FOR RESALE PURSUANT TO RULE 144A, TO A PERSON IT REASONABLY BELIEVES IS A “QUALIFIED INSTITUTIONAL BUYER” AS DEFINED IN RULE 144A THAT PURCHASES FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE IS GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A, (D) PURSUANT TO OFFERS AND SALES TO NON-U.S. PURCHASERS THAT OCCUR OUTSIDE THE UNITED STATES WITHIN THE MEANING OF REGULATION S UNDER THE SECURITIES ACT, PURSUANT TO RULE ▇▇▇ ▇▇ ▇▇▇▇▇▇▇▇▇▇ ▇, ▇▇ (E) PURSUANT TO ANOTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND THE SECURITIES LAWS OF ANY OTHER JURISDICTION, INCLUDING ANY STATE OF THE UNITED STATES, SUBJECT TO THE COMPANY’S AND THE TRUSTEE’S RIGHT PRIOR TO ANY SUCH OFFER, SALE OR TRANSFER PURSUANT TO CLAUSE (D) OR (E) TO REQUIRE THE DELIVERY OF AN OPINION OF COUNSEL, CERTIFICATION AND/OR OTHER INFORMATION SATISFACTORY TO EACH OF THEM, AND IN EACH OF THE FOREGOING CASES, A CERTIFICATE OF TRANSFER IN THE FORM APPEARING ON THE OTHER SIDE OF THIS SECURITY IS COMPLETED AND DELIVERED BY THE TRANSFEROR TO THE TRUSTEE. THIS LEGEND WILL BE REMOVED UPON THE REQUEST OF THE HOLDER AFTER THE RESALE RESTRICTION TERMINATION DATE.”

You have advised the Company that you will make offers (the “Exempt Resales”) of the Notes purchased by you hereunder on the terms set forth in each of the Pricing Disclosure Package and the Offering Memorandum, as amended or supplemented, solely to (i) persons whom you reasonably believe to be “qualified institutional buyers” as defined in Rule 144A under the Securities Act (“QIBs”) and (ii) outside the United States to certain persons who are not U.S. Persons (as defined in Regulation S under the Securities Act (“Regulation S”)) (such persons, “Non-U.S. Persons”) in offshore transactions in reliance on Regulation S. Those persons specified in clauses (i) and (ii) are referred to herein as the (“Eligible Purchasers”). You will offer the Notes to Eligible Purchasers initially at a price equal to 100% of the principal amount thereof. Such price may be changed at any time without notice.

Holders (including subsequent transferees) of the Notes will have the registration rights set forth in the registration rights agreement (the “Registration Rights Agreement”) by and among the Company, the Guarantors and the Initial Purchasers to be dated May 20, 2011 (the “Closing Date”), for so long as such Notes constitute “Transfer Restricted Securities” (as defined in the Registration Rights Agreement). Pursuant to the Registration Rights Agreement, the Company and the Guarantors will agree to file with the Commission, under the circumstances set forth therein, a registration statement under the Securities Act (the “Exchange Offer Registration Statement”) relating to the Company’s $600 million 6.25% Senior Notes due 2019 (the “Exchange Notes”) and the Guarantors’ Exchange Guarantees (the “Exchange Guarantees”) to be offered in exchange for the Notes and the Guarantees. Such portion of the offering is referred to as the “Exchange Offer.”

2. Representations, Warranties and Agreements of the Company and the Guarantors. The Company and each of the Guarantors, jointly and severally, represent, warrant and agree as follows:

(a) When the Notes and Guarantees are issued and delivered pursuant to this Agreement, such Notes and Guarantees will not be of the same class (within the meaning of Rule 144A under the Securities Act) as securities of the Company or the Guarantors that are listed on a United States national securities exchange registered or that are quoted in a United States automated inter-dealer quotation system.

(b) Neither the Company nor any subsidiary is or, after giving effect to the offer and sale of the Notes and the application of the proceeds therefrom as described under “Use of Proceeds” in each of the Pricing Disclosure Package and the Offering Memorandum, will be an “investment company” or a company “controlled” by an “investment company” within the meaning of the Investment Company Act of 1940, as amended, and the rules and regulations of the Commission thereunder.

(c) Assuming that your representations and warranties in Section 3(b) are true, the purchase and resale of the Notes pursuant hereto (including pursuant to the Exempt Resales) is exempt from the registration requirements of the Securities Act. No form of general solicitation or general advertising within the meaning of Regulation D (including, but not limited to, advertisements, articles, notices or other communications published in any newspaper, magazine or similar medium or broadcast over television or radio, or any seminar or meeting whose attendees have been invited by any general solicitation or general advertising) was used by the Company, the Guarantors or any of their respective representatives (other than you, as to whom the Company and the Guarantors make no representation) in connection with the offer and sale of the Notes.

(d) No form of general solicitation or general advertising was used by the Company, the Guarantors or any of their respective representatives (other than you, as to whom the Company and the Guarantors make no representation) with respect to Notes sold outside the United States to Non-U.S. Persons, by means of any directed selling efforts within the meaning of Rule 902 under the Securities Act, and the Company, any affiliate of the Company and any person acting on its or their behalf (other than you, as to whom the Company and the Guarantors

make no representation) has complied with and will implement the “offering restrictions” required by Rule 902 under the Securities Act.

(e) Each of the Preliminary Offering Memorandum, the Pricing Disclosure Package and the Offering Memorandum, each as of its respective date, contains all the information specified in, and meets the requirements of, Rule 144A(d)(4) under the Securities Act.

(f) The Preliminary Offering Memorandum, the Pricing Disclosure Package and the Offering Memorandum have been prepared by the Company and the Guarantors for use by the Initial Purchasers in connection with the Exempt Resales. No order or decree preventing the use of the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum, or any order asserting that the transactions contemplated by this Agreement are subject to the registration requirements of the Securities Act has been issued, and no proceeding for that purpose has commenced or is pending or, to the knowledge of the Company or any of the Guarantors, is contemplated.

(g) The Pricing Disclosure Package did not, as of the Applicable Time, and will not, as of the Closing Date, contain an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements made therein, in the light of the circumstances under which they were made, not misleading; provided that no representation or warranty is made as to information contained in or omitted from the Pricing Disclosure Package in reliance upon and in conformity with written information furnished to the Company through the Representative by or on behalf of any Initial Purchaser specifically for inclusion therein, which information is specified in Section 8(e).

(h) The Offering Memorandum will not, as of its date and as of the Closing Date, contain an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements made therein, in the light of the circumstances under which they were made, not misleading; provided that no representation or warranty is made as to information contained in or omitted from the Offering Memorandum in reliance upon and in conformity with written information furnished to the Company through the Representative by or on behalf of any Initial Purchaser specifically for inclusion therein, which information is specified in Section 8(e).

(i) Other than the Pricing Term Sheet, the Company has not made any offer to sell or solicitation of an offer to buy the Notes that would constitute a “free writing prospectus” (if the offering of the Notes was made pursuant to a registered offering under the Securities Act), as defined in Rule 405 under the Securities Act (a “Free Writing Offering Document”) without the prior consent of the Representative; any such Free Writing Offering Document, the use of which has been previously consented to by the Representative, is listed on Schedule IV(a) and (b). Each such Free Writing Offering Document, when taken together with the Pricing Disclosure Package, did not, and at the Closing Date 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 light of the circumstances under which they were made, not misleading; provided that no representation and warranty is made with respect to any statements or omissions made in each such Free Writing Offering Document in reliance upon and in conformity with

information relating to any Initial Purchaser furnished to the Company through the Representative by or on behalf of any Initial Purchaser specifically for inclusion therein.

(j) The Exchange Act Reports did not, and will not when filed with the Commission, contain an untrue statement of material fact or omit to state a material fact necessary in order to make the statements made therein, in the light of the circumstances under which they were made, not misleading.

(k) The statistical and market-related data included under the captions “Summary,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and “Business” in the Pricing Disclosure Package and the Offering Memorandum and the consolidated financial statements of the Company and its subsidiaries included in the Pricing Disclosure Package and the Offering Memorandum are based on or derived from sources that the Company believes to be reliable and accurate in all material respects.

(l) Each of the Company, the Guarantors and their respective subsidiaries has been duly organized and is validly existing and in good standing as a corporation or other business entity under the laws of its jurisdiction of organization and is duly qualified to do business and in good standing as a foreign corporation or other business entity in each jurisdiction in which its ownership or lease of property or the conduct of its businesses requires such qualification, except where the failure to be so qualified or in good standing would not, in the aggregate, reasonably be expected to have a material adverse effect on the condition (financial or otherwise), results of operations, stockholders’ equity, properties, business or prospects of the Company and its subsidiaries taken as a whole or a material adverse effect on the performance by the Company and the Guarantors of the performance of this Agreement, the Indenture or the Notes or the consummation of any of the transactions contemplated hereby or thereby (a “Material Adverse Effect”); each of the Company, the Guarantors and their respective subsidiaries has all power and authority necessary to own or hold its properties and to conduct the businesses in which it is engaged. The Company does not own or control, directly or indirectly, any corporation, association or other entity other than the subsidiaries listed in the Company’s Annual Report on Form 10-K for the most recent fiscal year and any entities listed on Schedule V. None of the subsidiaries of the Company (other than the subsidiaries set forth on Schedule VI (collectively, the “Significant Subsidiaries”)) is a “significant subsidiary” (as defined in Rule 405 under the Securities Act).

(m) The Company has an authorized capitalization as set forth in each of the Pricing Disclosure Package and the Offering Memorandum, and all of the issued shares of capital stock of the Company have been duly authorized and validly issued and are fully paid and non-assessable; and all of the issued shares of capital stock or other ownership interests of each subsidiary of the Company have been duly authorized and validly issued, are fully paid and non-assessable and are owned directly or indirectly by the Company, free and clear of all liens, encumbrances, equities or claims, except as described in the Pricing Disclosure Package and the Offering Memorandum and except for such liens, encumbrances, equities or claims as would not, in the aggregate, reasonably be expected to have a Material Adverse Effect.

(n) The Company and each Guarantor has all requisite corporate power and authority to execute, deliver and perform its obligations under the Indenture. The Indenture has

been duly and validly authorized by the Company and the Guarantors, and upon its execution and delivery and, assuming due authorization, execution and delivery by the Trustee, will constitute the valid and binding agreement of the Company and the Guarantors, enforceable against the Company and the Guarantors in accordance with its terms, except as such enforceability may be limited by bankruptcy, fraudulent conveyance, insolvency, reorganization, moratorium, and other laws relating to or affecting creditors’ rights generally and by general equitable principles (regardless of whether such enforceability is considered in a proceeding in equity or at law); no qualification of the Indenture under the Trust Indenture Act of 1939 (the “1939 Act”) is required in connection with the offer and sale of the Notes contemplated hereby or in connection with the Exempt Resales. The Indenture will conform to the description thereof in each of the Pricing Disclosure Package and the Offering Memorandum.

(o) The Company has all requisite corporate power and authority to execute, issue, sell and perform its obligations under the Notes. The Notes have been duly authorized by the Company and, when duly executed by the Company in accordance with the terms of the Indenture, assuming due authentication of the Notes by the Trustee, upon delivery to the Initial Purchasers against payment therefor in accordance with the terms hereof, will be validly issued and delivered and will constitute valid and binding obligations of the Company entitled to the benefits of the Indenture, enforceable against the Company in accordance with their terms, except as such enforceability may be limited by bankruptcy, fraudulent conveyance, insolvency, reorganization, moratorium, and other laws relating to or affecting creditors’ rights generally and by general equitable principles (regardless of whether such enforceability is considered in a proceeding in equity or at law). The Notes will conform in all material respects to the description thereof in each of the Pricing Disclosure Package and the Offering Memorandum.

(p) The Company has all requisite corporate power and authority to execute, issue and perform its obligations under the Exchange Notes. The Exchange Notes have been duly and validly authorized by the Company and if and when issued and authenticated in accordance with the terms of the Indenture and delivered in accordance with the Exchange Offer provided for in the Registration Rights Agreement, will be validly issued and delivered and will constitute valid and binding obligations of the Company entitled to the benefits of the Indenture, enforceable against the Company in accordance with their terms, except as such enforceability may be limited by bankruptcy, fraudulent conveyance, insolvency, reorganization, moratorium, and other laws relating to or affecting creditors’ rights generally and by general equitable principles (regardless of whether such enforceability is considered in a proceeding in equity or at law).

(q) Each Guarantor has all requisite corporate, partnership or limited liability company power and authority, as applicable, to execute, issue and perform its obligations under the Guarantees. The Guarantees have been duly and validly authorized by the Guarantors and when the Indenture is duly executed and delivered by the Guarantors in accordance with its terms and upon the due execution, authentication and delivery of the Notes in accordance with the Indenture and the issuance of the Notes in the sale to the Initial Purchasers contemplated by this Agreement, will constitute valid and binding obligations of the Guarantors, enforceable against the Guarantors in accordance with their terms, except as such enforceability may be limited by bankruptcy, fraudulent conveyance, insolvency, reorganization, moratorium, and other laws relating to or affecting creditors’ rights generally and by general equitable principles

(regardless of whether such enforceability is considered in a proceeding in equity or at law). The Guarantees will conform in all material respects to the description thereof in each of the Pricing Disclosure Package and the Offering Memorandum.

(r) Each Guarantor has all requisite corporate, partnership or limited liability company power and authority, as applicable, to execute, issue and perform its obligations under the Exchange Guarantees. The Exchange Guarantees have been duly and validly authorized by the Guarantors and if and when executed and delivered by the Guarantors in accordance with the terms of the Indenture and upon the due execution and authentication of the Exchange Notes in accordance with the Indenture and the issuance and delivery of the Exchange Notes in the Exchange Offer contemplated by the Registration Rights Agreement, will be validly issued and delivered and will constitute valid and binding obligations of the Guarantors entitled to the benefits of the Indenture, enforceable against the Guarantors in accordance with their terms, except as such enforceability may be limited by bankruptcy, fraudulent conveyance, insolvency, reorganization, moratorium, and other laws relating to or affecting creditors’ rights generally and by general equitable principles (regardless of whether such enforceability is considered in a proceeding in equity or at law).

(s) The Company and each Guarantor has all requisite corporate, partnership or limited liability company power and authority, as applicable, to execute, deliver and perform its obligations under the Registration Rights Agreement. The Registration Rights Agreement has been duly authorized by the Company and each Guarantor and, when executed and delivered by the Company and each Guarantor in accordance with the terms hereof and thereof, will be validly executed and delivered and (assuming the due authorization, execution and delivery thereof by you) will be the legally valid and binding obligation of the Company and each Guarantor in accordance with the terms thereof, enforceable against the Company and each Guarantor in accordance with its terms, except as such enforceability may be limited by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditor’s rights generally, by general equitable principles (regardless of whether such enforceability is considered in a proceeding in equity or at law) and, as to rights of indemnification and contribution, by principles of public policy. The Registration Rights Agreement will conform to the description thereof in each of the Pricing Disclosure Package and the Offering Memorandum.

(t) The Company and each Guarantor has all requisite corporate power to execute, deliver and perform its obligations under this Agreement. This Agreement has been duly and validly authorized, executed and delivered by the Company and each of the Guarantors.

(u) The issue and sale of the Notes and the Guarantees, the execution, delivery and performance by the Company and the Guarantors of the Notes, the Guarantees, the Exchange Notes, the Exchange Guarantees, the Indenture, the Registration Rights Agreement and this Agreement, the application of the proceeds from the sale of the Notes as described under “Use of Proceeds” in each of the Pricing Disclosure Package and the Offering Memorandum and the consummation of the transactions contemplated hereby and thereby, will not (i) conflict with or result in a breach or violation of any of the terms or provisions of, impose any lien, charge or encumbrance upon any property or assets of the Company, the Guarantors or their respective subsidiaries, or constitute a default under, any indenture, mortgage, deed of trust, loan

agreement, license, lease or other agreement or instrument to which the Company, the Guarantors or any of their respective subsidiaries is a party or by which the Company, the Guarantors or any of their respective subsidiaries is bound or to which any of the property or assets of the Company, the Guarantors or any of their respective subsidiaries is subject, (ii) result in any violation of the provisions of the charter or by-laws or similar organizational document of the Company, the Guarantors or any of their respective subsidiaries or (iii) result in any violation of any statute or any judgment, order, decree, rule or regulation of any court or governmental agency or body having jurisdiction over the Company, the Guarantors or any of their respective subsidiaries or any of their properties or assets, except, with respect to clauses (i) and (iii), conflicts or violations that could not reasonably be expected to have a Material Adverse Effect.

(v) No consent, approval, authorization or order of, or filing, registration or qualification with any court or governmental agency or body having jurisdiction over the Company, the Guarantors or any of their respective subsidiaries is required for the issue and sale of the Notes and the Guarantees, the execution, delivery and performance by the Company and the Guarantors of the Notes, the Guarantees, the Exchange Notes, the Exchange Guarantees, the Indenture, the Registration Rights Agreement and this Agreement, the application of the proceeds from the sale of the Notes as described under “Use of Proceeds” in each of the Pricing Disclosure Package and the Offering Memorandum and the consummation of the transactions contemplated hereby and thereby, except for the filing of a registration statement by the Company with the Commission pursuant to the Securities Act, as required by the Registration Rights Agreement, and the qualification of the Indenture under the Trust Indenture Act of 1939 in connection with the registration of the Exchange Notes under the Securities Act and such consents, approvals, authorizations, orders, filings, registrations or qualifications as may be required under state securities or Blue Sky laws in connection with the purchase and distribution of the Notes by the Initial Purchasers.

(w) Except for (i) the Registration Rights Agreement and (ii) that certain Registration Rights Agreement dated January 31, 2011 by and among Barclays Capital Inc., the Company and certain of the Guarantors, there are no contracts, agreements or understandings between the Company, any Guarantor and any person granting such person the right to require the Company or any Guarantor to file a registration statement under the Securities Act with respect to any securities of the Company or any Guarantor owned or to be owned by such person or to require the Company or any Guarantor to include such securities in the securities registered pursuant to the Registration Rights Agreement or in any securities being registered pursuant to any other registration statement filed by the Company or any Guarantor under the Securities Act.

(x) Neither the Company, any Guarantor nor any other person acting on behalf of the Company or any Guarantor has sold or issued any securities that would be integrated with the offering of the Notes contemplated by this Agreement pursuant to the Securities Act, the rules and regulations thereunder or the interpretations thereof by the Commission. The Company and the Guarantors will take reasonable precautions designed to insure that any offer or sale, direct or indirect, in the United States or to any U.S. person (as defined in Rule 902 under the Securities Act), of any Notes or any substantially similar security issued by the Company or any Guarantor, within six months subsequent to the date on which the distribution of the Notes has been completed (as notified to the Company by the Initial Purchasers), is made under restrictions and other circumstances reasonably designed not to affect

the status of the offer and sale of the Notes in the United States and to U.S. persons contemplated by this Agreement as transactions exempt from the registration provisions of the Securities Act, including any sales pursuant to Rule 144A under, or Regulations D or S of, the Securities Act.

(y) Neither the Company, the Guarantors nor any of their respective subsidiaries has sustained, since the date of the latest audited financial statements included or incorporated by reference in the Pricing Disclosure Package and the Offering Memorandum, any loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor dispute or court or governmental action, order or decree, and, since such date, there has not been any change in the capital stock, partnership or limited liability interests, as applicable, or long-term debt, of the Company, the Guarantors or any of their respective subsidiaries or any adverse change, or any development involving a prospective adverse change, in or affecting the condition (financial or otherwise), results of operations, stockholders’ equity, properties, management, business or prospects of the Company and its subsidiaries, taken as a whole, in each case except as could not, in the aggregate, reasonably be expected to have a Material Adverse Effect.

(z) The historical financial statements (including the related notes and supporting schedules) included or incorporated by reference in the Pricing Disclosure Package and the Offering Memorandum present fairly in all material respects the financial condition, results of operations and cash flows of the entities purported to be shown thereby, at the dates and for the periods indicated, and have been prepared in conformity with accounting principles generally accepted in the United States applied on a consistent basis throughout the periods involved. The pro forma financial statements included or incorporated by reference in the Pricing Disclosure Package and the Offering Memorandum include assumptions that provide a reasonable basis for presenting the significant effects directly attributable to the transactions and events described therein, the related pro forma adjustments give appropriate effect to those assumptions, and the pro forma adjustments reflect the proper application of those adjustments to the historical financial statement amounts and the pro forma financial statements included in the Pricing Disclosure Package. The pro forma financial statements included or incorporated by reference in the Pricing Disclosure Package and the Offering Memorandum have been prepared in accordance with the Commission’s rules and guidance relating to pro forma financial information with respect to the transactions and events described therein. The pro forma financial statements included or incorporated by reference in the Pricing Disclosure Package and the Offering Memorandum have been prepared on a basis consistent with such historical financial statements, except for the pro forma adjustments specified therein include all material adjustments to the historical financial data required by Rule 11-02 of Regulation S-X to reflect the Company’s sale of its Fayetteville Shale upstream assets, which closed on December 22, 2010, and the initial contribution of its Haynesville Shale midstream operations to KinderHawk Field Services LLC, which closed on May 21, 2010 (as discussed in the Pricing Disclosure Package and the Offering Memorandum), and give effect to assumptions made on a reasonable basis and in good faith present fairly in all material respects the historical and proposed transactions contemplated by the Pricing Disclosure Package and the Offering Memorandum. The other financial information and data included in the Pricing Disclosure Package and the Offering Memorandum, historical and pro forma, are, in all material respects, accurately presented and prepared on a basis consistent with such financial statements and the books and records of the Company.

(aa) Deloitte & Touche LLP, who have certified certain financial statements of the Company and its consolidated subsidiaries, whose report appears in the Pricing Disclosure Package and the Offering Memorandum or is incorporated by reference therein and who have delivered the initial letter referred to in Section 7(f) hereof, are independent public accountants as required by the Securities Act and the rules and regulations thereunder and the rules and regulations of the Public Company Accounting Oversight Board (the “PCAOB”) during the periods covered by the financial statements on which they reported contained or incorporated by reference in the Pricing Disclosure Package and the Offering Memorandum.

(bb) Netherland, ▇▇▇▇▇▇ & Associates, Inc., an oil and gas consulting firm (“NSAI”), whose report dated January 31, 2011, is summarized or excerpted in reports incorporated by reference, or included, in the Pricing Disclosure Package and the Offering Memorandum and who has delivered the initial expert letter referred to in Section 7(j) hereof, was, as of the date of such report, and is, as of the date hereof, an independent petroleum engineer with respect to the Company. The written engineering report prepared by NSAI dated January 31, 2011, setting forth the proved reserves attributed to the oil and gas properties of the Company and its subsidiaries accurately reflects in all material respects the ownership interests of the Company its subsidiaries in the properties therein as of December 31, 2010; the information furnished by the Company to NSAI for purposes of preparing its report, including, without limitation, production, costs of operation and development, current prices for production, agreements relating to current and future operations and sales of production, was true, correct and complete in all material respects on the date supplied and was prepared in accordance with customary industry practices, as indicated in the letter of NSAI dated January 31, 2011.

(cc) Except as described in the Pricing Disclosure Package and the Offering Memorandum, the Company, the Guarantors and each of their respective subsidiaries has defensible title to all of their interests in oil and gas properties (other than interests earned under farm-out, participation or similar agreements in which an assignment or transfer is pending) and all their interests in other real property 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 such as (i) are described in the Pricing Disclosure Package and the Offering Memorandum, (ii) liens and encumbrances under operating agreements, unitization and pooling agreements, production sales contracts, farm-out agreements and other oil and gas exploration participation and production agreements, in each case that secure payment of amounts not yet due and payable for the performance of other unmatured obligations and are of a scope and nature customary in the oil and gas industry or arise in connection with drilling and production operations, or (iii) would not have a Material Adverse Effect on the value of the affected property or the use made and proposed to be made of such property by the Company, the Guarantors or any of their respective subsidiaries, as the case may be; except as would not have a Material Adverse Effect, all of the leases and subleases of real property of the Company, the Guarantors or any of their respective subsidiaries and under which the Company, the Guarantors or any of their respective subsidiaries holds properties described in the Pricing Disclosure Package and the Offering Memorandum, are in full force and effect, and neither the Company, the Guarantors nor any of their respective subsidiaries has received written notice of any claim of any sort that has been asserted by anyone adverse to the rights of the Company, the Guarantors or any of their respective subsidiaries under any of such leases or subleases, or affecting or questioning the rights of the Company, the Guarantors or any of their respective

subsidiaries to the continued possession of the leased or subleased premises under any such lease or sublease.

(dd) The Company and each of its subsidiaries have such permits, licenses, patents, franchises, certificates of need and other approvals or authorizations of governmental or regulatory authorities (“Permits”) as are necessary under applicable law to own their properties and conduct their businesses in the manner described in the Pricing Disclosure Package and the Offering Memorandum, except for any of the foregoing that could not, in the aggregate, reasonably be expected to have a Material Adverse Effect; each of the Company and its subsidiaries has fulfilled and performed all of its obligations with respect to the Permits, and no event has occurred that allows, or after notice or lapse of time would allow, revocation or termination thereof or results in any other impairment of the rights of the holder or any such Permits, except for any of the foregoing that could not reasonably be expected to have a Material Adverse Effect.

(ee) The Company and each of its subsidiaries own or possess adequate rights to use all material patents, patent applications, trademarks, service marks, trade names, trademark registrations, service ▇▇▇▇ registrations, copyrights, licenses, know-how, software, systems and technology (including trade secrets and other unpatented and/or unpatentable proprietary or confidential information, systems or procedures) necessary for the conduct of their respective businesses and have no reason to believe that the conduct of their respective businesses will conflict with, and have not received any notice of any claim of conflict with, any such rights of others.

(ff) There are no legal or governmental proceedings pending to which the Company or any of its subsidiaries is a party or of which any property or assets of the Company or any of its subsidiaries is the subject that could, in the aggregate, reasonably be expected to have a Material Adverse Effect or could, in the aggregate, reasonably be expected to have a material adverse effect on the performance by the Company and the Guarantors of the performance of this Agreement, the Indenture or the Notes or the consummation of any of the transactions contemplated hereby; and to the Company’s and each Guarantors’ knowledge, no such proceedings are threatened or contemplated by governmental authorities or others.

(gg) There are no legal or governmental proceedings or contracts or other documents that would be required to be described in a registration statement filed under the Securities Act or, in the case of documents, would be required to be filed as exhibits to a registration statement of the Company pursuant to Item 601(10) of Regulation S-K that have not been described in the Pricing Disclosure Package and the Offering Memorandum. Neither the Company, the Guarantors nor any of their respective subsidiaries has knowledge that any other party to any such contract, agreement or arrangement has any intention not to render full performance as contemplated by the terms thereof; and that statements made in the Pricing Disclosure Package and the Offering Memorandum under the captions “Business,” “Material U.S. Federal Tax Considerations,” and “Certain ERISA Considerations,” insofar as they purport to constitute summaries of the terms of legal or governmental proceedings or contracts and other documents, constitute accurate summaries of the terms of such legal and governmental proceedings and contracts and other documents in all material respects.

(hh) No relationship, direct or indirect, that would be required to be described in a registration statement of the Company pursuant to Item 404 of Regulation S-K, exists between or among the Company or any Guarantor, on the one hand, and the directors, officers, stockholders, customers or suppliers of the Company or any Guarantor, on the other hand, that has not been described in the Pricing Disclosure Package and the Offering Memorandum.

(ii) No labor disturbance by the employees of the Company or any of its subsidiaries exists or, to the knowledge of the Company or any Guarantor, is imminent that could reasonably be expected to have a Material Adverse Effect.

(jj) (i) Each “employee benefit plan” (within the meaning of Section 3(3) of the Employee Retirement Security Act of 1974, as amended (“ERISA”)) for which the Company or any member of its “Controlled Group” (defined as any organization which is a member of a controlled group of corporations within the meaning of Section 414 of the Internal Revenue Code of 1986, as amended (the “Code”)) would have any liability (each a “Plan”) has been maintained in compliance with its terms and with the requirements of all applicable statutes, rules and regulations including ERISA and the Code; (ii) with respect to each Plan subject to Title IV of ERISA (a) no “reportable event” (within the meaning of Section 4043(c) of ERISA) has occurred or is reasonably expected to occur, (b) no “accumulated funding deficiency” (within the meaning of Section 302 of ERISA or Section 412 of the Code), whether or not waived, has occurred or is reasonably expected to occur, (c) the fair market value of the assets under each Plan exceeds the present value of all benefits accrued under such Plan (determined based on those assumptions used to fund such Plan) and (d) neither the Company or any member of its Controlled Group has incurred, or reasonably expects to incur, any liability under Title IV of ERISA (other than contributions to the Plan or premiums to the PBGC in the ordinary course and without default) in respect of a Plan (including a “multiemployer plan”, within the meaning of Section 4001(c)(3) of ERISA); and (iii) each Plan that is intended to be qualified under Section 401(a) of the Code is so qualified and nothing has occurred, whether by action or by failure to act, which would cause the loss of such qualification.

(kk) The Company and each of its subsidiaries has filed all federal, state, local and foreign income and franchise tax returns required to be filed through the date hereof, subject to permitted extensions, and paid all taxes due thereon, and (i) no tax deficiency has been determined adversely to the Company, the Guarantors or any of their respective subsidiaries, nor (ii) does the Company or any Guarantor have any knowledge of any tax deficiencies that could, in the case of clause (i) or (ii) in the aggregate, reasonably be expected to have a Material Adverse Effect.

(ll) There are no transfer taxes 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 by the Company or sale by the Company of the Notes.

(mm) Since the date as of which information is given in the Pricing Disclosure Package and the Offering Memorandum and except as may otherwise be described in the Pricing Disclosure Package and the Offering Memorandum, neither the Company nor any Guarantor has (i) issued or granted any securities except pursuant to the exercise of outstanding options

described therein, (ii) incurred any liability or obligation, direct or contingent, other than liabilities and obligations that were incurred in the ordinary course of business, (iii) entered into any material transaction not in the ordinary course of business or (iv) declared or paid any dividend on its capital stock.

(nn) The Company and each of its subsidiaries (i) makes and keeps accurate financial books and records and (ii) maintains and has maintained effective internal control over financial reporting as defined in Rule 13a-15 under the Exchange Act and a system of internal accounting controls sufficient to provide reasonable assurance that (A) transactions are executed in accordance with management’s general or specific authorization, (B) transactions are recorded as necessary to permit preparation of its financial statements in conformity with accounting principles generally accepted in the United States and to maintain accountability for its assets, (C) access to its assets is permitted only in accordance with management’s general or specific authorization and (D) the reported accountability for its assets is compared with existing assets at reasonable intervals and appropriate action is taken with respect to any differences.

(oo) Neither the Company nor any of its subsidiaries (i) is in violation of its charter or by-laws (or similar organizational documents), (ii) is in default, and no event has occurred that, with notice or lapse of time or both, would constitute such a default, in the due performance or observance of any term, covenant, condition or other obligation contained in any indenture, mortgage, deed of trust, loan agreement, license or other agreement or instrument to which it is a party or by which it is bound or to which any of its properties or assets is subject or (iii) is in violation of any statute or any order, rule or regulation of any court or governmental agency or body having jurisdiction over it or its property or assets or has failed to obtain any license, permit, certificate, franchise or other governmental authorization or permit necessary to the ownership of its property or to the conduct of its business, except in the case of clauses (ii) and (iii), to the extent any such conflict, breach, violation or default could not, in the aggregate, reasonably be expected to have a Material Adverse Effect.

(pp) Neither the Company nor any of its subsidiaries, nor, to the knowledge of the Company and the Guarantors, any director, officer, agent, employee or other person associated with or acting on behalf of the Company, the Guarantors or any of their respective 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.

(qq) The Company and each of its subsidiaries (i) are, and at all times prior hereto were, in compliance with all laws, regulations, ordinances, rules, orders, judgments, decrees, permits or other legal requirements of any governmental authority, including without limitation any international, national, state, provincial, regional, or local authority, relating to the protection of human health or safety, the environment, or natural resources, or to hazardous or toxic substances or wastes, pollutants or contaminants (“Environmental Laws”) applicable to such entity, which compliance includes, without limitation, obtaining, maintaining and complying with all permits and authorizations and approvals required by Environmental Laws to conduct their respective businesses, and (ii) have not received notice of any actual or alleged

violation of Environmental Laws, or of any potential liability for or other obligation concerning the presence, disposal or release of hazardous or toxic substances or wastes, pollutants or contaminants, except in the case of clause (i) or (ii) where such non-compliance, violation, liability, or other obligation could not, in the aggregate, reasonably be expected to have a Material Adverse Effect. Except as described in the Pricing Disclosure Package, (A) there are no proceedings that are pending, or known to be contemplated, against the Company or any of its subsidiaries under Environmental Laws in which a governmental authority is also a party, other than such proceedings regarding which it is reasonably believed no monetary sanctions of $100,000 or more will be imposed, (B) the Company, the Guarantors and their respective subsidiaries are not aware of any issues regarding compliance with Environmental Laws, or liabilities or other obligations under Environmental Laws or concerning hazardous or toxic substances or wastes, pollutants or contaminants, that could reasonably be expected to have a Material Adverse Effect, and (C) none of the Company, the Guarantors and their respective subsidiaries anticipates material capital expenditures other than in the ordinary course of business relating to Environmental Laws.

(rr) None of the transactions contemplated by this Agreement (including, without limitation, the use of the proceeds from the sale of the Notes), will violate or result in a violation of Section 7 of the Exchange Act, or any regulation promulgated thereunder, including, without limitation, Regulations T, U and X of the Board of Governors of the Federal Reserve System.

(ss) The statements set forth in each of the Pricing Disclosure Package and the Offering Memorandum under the caption “Description of the Notes,” insofar as they purport to constitute a summary of the terms of the Notes and the Guarantees and under the captions “Material U.S. Federal Tax Considerations,” “Description of Other Indebtedness,” and “Plan of Distribution,” insofar as they purport to describe the provisions of the documents referred to therein, are accurate in all material respects.

(tt) The Company and its affiliates have not taken, directly or indirectly, any action designed to or that has constituted or that could reasonably be expected to cause or result in the stabilization or manipulation of the price of any security of the Company or the Guarantors in connection with the offering of the Notes.

(uu) (i) The Company and each of its subsidiaries have established and maintain disclosure controls and procedures (as such term is defined in Rule 13a-15 under the Exchange Act), (ii) such disclosure controls and procedures are designed to ensure that the information required to be disclosed by the Company in the reports they file or submit under the Exchange Act (assuming the Company was required to file or submit such reports under the Exchange Act) is accumulated and communicated to management of the Company and its subsidiaries, including their respective principal executive officers and principal financial officers, as appropriate, to allow timely decisions regarding required disclosure to be made; and (iii) such disclosure controls and procedures are effective in all material respects to perform the functions for which they were established.

(vv) Since the date of the most recent balance sheet of the Company and its consolidated subsidiaries reviewed or audited by Deloitte & Touche LLP and the audit

committee of the board of directors of the Company, (i) the Company has not been advised by its auditors of (A) any significant deficiencies in the design or operation of internal controls that would adversely affect the ability of the Company or any of its subsidiaries to record, process, summarize and report financial data, or any material weaknesses in internal controls and (B) any fraud, whether or not material, that involves management or other employees who have a significant role in the internal controls of the Company and each of its subsidiaries, and (ii) since that date, there have been no significant changes in internal controls or in other factors that would significantly affect internal controls, including any corrective actions with regard to significant deficiencies and material weaknesses.

(ww) 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 the Pricing Disclosure Package.

(xx) There is and has been no failure on the part of the Company and any of the Company’s directors or officers, in their capacities as such, to comply with the provisions of the ▇▇▇▇▇▇▇▇-▇▇▇▇▇ Act of 2002 and the rules and regulations promulgated in connection therewith.

(yy) The section entitled “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Critical Accounting Policies and Estimates” contained in the Pricing Disclosure Package and the Offering Memorandum accurately and fully describes in all material respects (A) the accounting policies that the Company believed as of the date thereof were the most important in the portrayal of the Company’s financial condition and results of operations and that required management’s most difficult, subjective or complex judgments; (B) the judgments and uncertainties affecting the application of critical accounting policies; and (C) the likelihood that materially different amounts would be reported under different conditions or using different assumptions and an explanation thereof.

(zz) 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 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, except, in each case, as would not reasonably be expected to have a Material Adverse Effect.

(aaa) Neither the Company nor any of its subsidiaries nor, to the knowledge of the Company or any Guarantor, 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.

(bbb) The Company has not taken any action or omitted to take any action (such as issuing any press release relating to any Notes without an appropriate legend) which may result in the loss by any of the Initial Purchasers of the ability to rely on any stabilization safe harbor provided by the Financial Services Authority under the Financial Services and Markets ▇▇▇ ▇▇▇▇ (the “FSMA”). The Company has been informed of the guidance relating to stabilization provided by the Financial Services Authority, in particular in Section MAR 2 Annex 2G of the Financial Services Handbook.

(ccc) Immediately after the consummation of the issuance and sale of the Notes in accordance with the terms of this Agreement, the Company will be Solvent. As used in this paragraph, the term “Solvent” means, with respect to a particular date, that on such date (i) the present fair market value (or present fair saleable value) of the assets of the Company and its subsidiaries are not less than the total amount required to pay the probable liabilities of the Company and its subsidiaries on their total existing debts and liabilities (including contingent liabilities) as they become absolute and matured, (ii) the Company and its subsidiaries are able to realize upon their assets and pay their debts and other liabilities, contingent obligations and commitments as they mature and become due in the normal course of business, (iii) assuming the sale of the Notes as contemplated by this Agreement, the Pricing Disclosure Package and the Offering Memorandum, the Company and its subsidiaries are not incurring debts or liabilities beyond their ability to pay as such debts and liabilities mature and (iv) the Company and its subsidiaries are not engaged in any business or transaction, and are not about to engage in any business or transaction, for which their property would constitute unreasonably small capital after giving due consideration to the prevailing practice in the industry in which the Company and its subsidiaries are engaged. In computing the amount of such contingent liabilities at any time, it is intended that such liabilities will be computed at the amount that, in the light of all the facts and circumstances existing at such time, represents the amount that can reasonably be expected to become an actual or matured liability.

(ddd) As of the date hereof, (i) all royalties, rentals, deposits and other amounts owed under the oil and gas leases constituting the oil and gas properties of the Company, the Guarantors and their respective subsidiaries have been properly and timely paid (other than amounts held in suspense accounts pending routine payments or related to disputes about the proper identification of royalty owners), and no amount of proceeds from the sale or production attributable to the oil and gas properties of the Company, the Guarantors and their respective subsidiaries are currently being held in suspense by any purchaser thereof, except where such amounts due could not, individually or in the aggregate, have a Material Adverse Effect on the Company, the Guarantors or any of their respective subsidiaries, and (ii) there are no claims under take-or-pay contracts pursuant to which natural gas purchasers have any make-up rights affecting the interests of the Company, the Guarantors or their respective subsidiaries in their oil and gas properties, except where such claims could not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect on the Company, the Guarantors or any of their respective subsidiaries.

(eee) Any certificate signed by any officer of the Company or any Guarantor and delivered to the Representative or counsel for the Initial Purchasers in connection with the offering of the Notes shall be deemed a representation and warranty by the Company or such Guarantor, as to matters covered thereby, to each Initial Purchaser.

3. Purchase of the Notes by the Initial Purchasers, Agreements to Sell, Purchase and Resell.

(a) The Company and the Guarantors, jointly and severally hereby agree, on the basis of the representations, warranties and agreements of the Initial Purchasers contained herein and subject to all the terms and conditions set forth herein, to issue and sell to the Initial Purchasers and, upon the basis of the representations, warranties and agreements of the Company and the Guarantors herein contained and subject to all the terms and conditions set forth herein, each Initial Purchaser agrees, severally and not jointly, to purchase from the Company, at a purchase price of 98.25% of the principal amount thereof, the total principal amount of Notes set forth opposite the name of such Initial Purchaser in Schedule I hereto. The Company and the Guarantors shall not be obligated to deliver any of the securities to be delivered hereunder except upon payment for all of the securities to be purchased as provided herein.

(b) Each of the Initial Purchasers, severally and not jointly hereby represents and warrants to the Company that it will offer the Notes for sale upon the terms and conditions set forth in this Agreement and in the Pricing Disclosure Package. Each of the Initial Purchasers hereby represents and warrants to, and agrees with, the Company, on the basis of the representations, warranties and agreements of the Company and the Guarantors, that such Initial Purchaser: (i) is a QIB with such knowledge and experience in financial and business matters as are necessary in order to evaluate the merits and risks of an investment in the Notes; (ii) is purchasing the Notes pursuant to a private sale exempt from registration under the Securities Act; (iii) in connection with the Exempt Resales, will solicit offers to buy the Notes only from, and will offer to sell the Notes only to, the Eligible Purchasers in accordance with this Agreement and on the terms contemplated by the Pricing Disclosure Package; and (iv) will not offer or sell the Notes, nor has it offered or sold the Notes by, or otherwise engaged in, any form of general solicitation or general advertising (within the meaning of Regulation D, including, but not limited to, advertisements, articles, notices or other communications published in any newspaper, magazine, or similar medium or broadcast over television or radio, or any seminar or meeting whose attendees have been invited by any general solicitation or general advertising) and will not engage in any directed selling efforts within the meaning of Rule 902 under the Securities Act, in connection with the offering of the Notes. The Initial Purchasers have advised the Company that they will offer the Notes to Eligible Purchasers at a price initially equal to 100% of the principal amount thereof, plus accrued interest, if any, from the date of issuance of the Notes. Such price may be changed by the Initial Purchasers at any time without notice.

(i) it has complied and will comply with all applicable provisions of the Financial Services and Markets ▇▇▇ ▇▇▇▇ (the “FSMA”) with respect to anything done by it in relation to the Notes in, from or otherwise involving the United Kingdom, and it has

only communicated or caused to be communicated and it will only communicate or cause to be communicated any invitation or inducement to engage in investment activity (within the meaning of section 21 of the FSMA) received by it in connection with the issue or sale of any Notes, in circumstances in which section 21(1) of the FSMA does not apply to the Company; and

(ii) in relation to each Member State of the European Economic Area which has implemented the Prospectus Directive (each, a “Relevant Member State”), with effect from and including the date on which the Prospectus Directive is implemented in that Relevant Member State (the “Relevant Implementation Date”), it has not made and will not make an offer of the Notes to the public in that Relevant Member State prior to the publication of a prospectus in relation to the Notes which has been approved by the competent authority in that Relevant Member State or, where appropriate, approved in another Relevant Member State and notified to the competent authority in that Relevant Member State, all in accordance with the Prospectus Directive, except that it may, with effect from and including the Relevant Implementation Date, make an offer of the Notes to the public in that Relevant Member State at any time:

(A) to legal entities which are authorized or regulated to operate in the financial markets or, if not so authorized or regulated, whose corporate purpose is solely to invest in securities;

(B) to any legal entity which has two or more of (1) an average of at least 250 employees during the last financial year; (2) a total balance sheet of more than €43,000,000 and (3) an annual net turnover of more than €50,000,000, as shown in its last annual or consolidated accounts;

(C) to fewer than 100, or if the Relevant Member State has implemented the relevant provision of the 2010 Prospectus Directive Amending Directive 150, natural or legal persons (other than qualified investors) subject to obtaining the prior consent of the representatives for any offer; or

(D) in any other circumstances which do not require the publication by the issuer of a prospectus pursuant to Article 3 of the Prospectus Directive.

For the purposes of this representation, the expression an “offer of securities to the public” in any Relevant Member State means the communication in any form and by any means of sufficient information on the terms of the offer and the Notes to be offered so as to enable an investor to decide to purchase or subscribe the Notes, as the same may be varied in that Relevant Member State by any measure implementing the Prospectus Directive in that Relevant Member State and the expression “Prospectus Directive” means Directive 2003/71/EC (and amendments thereto, including the 2010 Prospectus Directive Amendment Directive to the extent implemented in the Relevant Member State) and includes any relevant implementing measure in each Relevant Member State.

(d) Such Initial Purchaser has not nor, prior to the later to occur of (A) the Closing Date and (B) completion of the distribution of the Notes, will not, use, authorize use of, refer to or distribute any material in connection with the offering and sale of the Notes other than (i) the Preliminary Offering Memorandum, the Pricing Disclosure Package, the Offering Memorandum, (ii) any written communication that contains no “issuer information” (as defined in Rule 433(h)(2) under the Act) that was not included (including through incorporation by reference) in the Preliminary Offering Memorandum or any Free Writing Offering Document listed on Schedule IV(a) and (b) hereto, (iii) the Free Writing Offering Documents listed on Schedule IV(a) and (b) hereto, (iv) any written communication prepared by such Initial Purchaser and approved by the Company in writing, or (v) any written communication relating to or that contains the terms of the Notes and/or other information that was included (including through incorporation by reference) in the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum.

Each of the Initial Purchasers understands that the Company and, for purposes of the opinions to be delivered to the Initial Purchasers pursuant to Sections 7(c) and 7(e) hereof, counsel to the Company and counsel to the Initial Purchasers, will rely upon the accuracy and truth of the foregoing representations, warranties and agreements, and the Initial Purchasers hereby consents to such reliance.

4. Delivery of the Notes and Payment Therefor. Delivery to the Initial Purchasers of and payment for the Notes shall be made at 10:00 A.M., New York City time, on the third full business day following the date of this Agreement or at such other date or place as shall be determined by agreement between the Representative and the Company (the “Closing Date”). The place of closing for the Notes and the Closing Date may be varied by agreement between the Initial Purchasers and the Company.

The Notes will be delivered to the Initial Purchasers, or the Trustee as custodian for The Depository Trust Company (“DTC”), against payment by or on behalf of the Initial Purchasers of the purchase price therefor by wire transfer in immediately available funds, by causing DTC to credit the Notes to the account of the Initial Purchasers at DTC. The Notes will be evidenced by one or more global securities in definitive form (the “Global Notes”) and will be registered in the name of Cede & Co. as nominee of DTC. The Notes to be delivered to the Initial Purchasers shall be made available to the Initial Purchasers in New York City for inspection and packaging not later than 9:30 A.M., New York City time, on the business day next preceding the Closing Date.

5. Agreements of the Company and the Guarantors. The Company and the Guarantors, jointly and severally, agree with each of the Initial Purchasers as follows:

(a) The Company and the Guarantors will furnish to the Initial Purchasers, without charge, within one business day of the date of the Offering Memorandum, such number of copies of the Offering Memorandum, as may then be amended or supplemented, as they may reasonably request.

(b) The Company and the Guarantors will not make any amendment or supplement to the Pricing Disclosure Package or to the Offering Memorandum of which the

Initial Purchasers shall not previously have been advised or to which they shall reasonably object after being so advised.

(c) The Company and each of the Guarantors consents to the use of the Pricing Disclosure Package and the Offering Memorandum in accordance with the securities or Blue Sky laws of the jurisdictions in which the Notes are offered by the Initial Purchasers and by all dealers to whom Notes may be sold, in connection with the offering and sale of the Notes.

(d) If, at any time prior to completion of the distribution of the Notes by the Initial Purchasers to Eligible Purchasers, any event occurs or information becomes known that, in the judgment of the Company or any of the Guarantors or in the opinion of counsel for the Initial Purchasers, should be set forth in the Pricing Disclosure Package or the Offering Memorandum so that the Pricing Disclosure Package or the Offering Memorandum, as then amended or supplemented, does not include any untrue statement of 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, or if it is necessary to supplement or amend the Pricing Disclosure Package or the Offering Memorandum in order to comply with any law, the Company and the Guarantors will forthwith prepare an appropriate supplement or amendment thereto, and will expeditiously furnish to the Initial Purchasers and dealers a reasonable number of copies thereof.

(e) None of the Company nor any Guarantor will make any offer to sell or solicitation of an offer to buy the Notes that would constitute a Free Writing Offering Document without the prior consent of the Representative, which consent shall not be unreasonably withheld or delayed; if at any time following issuance of a Free Writing Offering Document any event occurred or occurs as a result of which such Free Writing Offering Document conflicts with the information in the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum or, when taken together with the information in the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum, includes an untrue statement of a material fact or omits to state any material fact necessary in order to make the statements therein, in the light of the circumstances then prevailing, not misleading, as promptly as practicable after becoming aware thereof, the Company will give notice thereof to the Initial Purchasers through the Representative and, if requested by the Representative, will prepare and furnish without charge to each Initial Purchaser a Free Writing Offering Document or other document which will correct such conflict, statement or omission.

(f) To promptly take such action as the Initial Purchasers may from time to time reasonably request to qualify the Notes for offering and sale under the securities or Blue Sky laws of such jurisdictions as the Initial Purchasers may request and to comply with such laws so as to permit the continuance of sales and dealings therein in such jurisdictions for as long as may be necessary to complete the distribution of the Notes; provided that in connection therewith the Company shall not be required to (i) qualify as a foreign corporation in any jurisdiction in which it would not otherwise be required to so qualify, (ii) file a general consent to service of process in any such jurisdiction or (iii) subject itself to taxation in any jurisdiction in which it would not otherwise be subject.

(g) For a period commencing on the date hereof and ending on the 90th day after the date of the Offering Memorandum, the Company and the Guarantors agree not to, directly or indirectly, (1) offer for sale, sell, or otherwise dispose of (or enter into any transaction or device that is designed to, or would be expected to, result in the disposition by any person at any time in the future of) any debt securities of the Company substantially similar to the Notes or securities convertible into or exchangeable for such debt securities of the Company, or sell or grant options, rights or warrants with respect to such debt securities of the Company or securities convertible into or exchangeable for such debt securities of the Company, (2) enter into any swap or other derivatives transaction that transfers to another, in whole or in part, any of the economic benefits or risks of ownership of such debt securities of the Company, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of debt securities of the Company or other securities, in cash or otherwise, (3) file or cause to be filed a registration statement, including any amendments, with respect to the registration of debt securities of the Company substantially similar to the Notes or securities convertible, exercisable or exchangeable into debt securities of the Company or (4) publicly announce an offering of any debt securities of the Company substantially similar to the Notes or securities convertible or exchangeable into such debt securities, in each case without the prior written consent of the Representative, on behalf of the Initial Purchasers, except in exchange for the Exchange Notes and the Exchange Guarantees in connection with the Exchange Offer.

(h) The Company will furnish to the holders of the Notes as soon as practicable 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 date of the Offering Memorandum), will make available to its securityholders consolidated summary financial information of the Company and its subsidiaries for such quarter in reasonable detail; provided that so long as the Company files periodic reports pursuant to Section 13 or 15(d) of the Exchange Act for the foregoing periods, the Company shall be deemed to comply with this Section 5(h).

(i) So long as any of the Notes are outstanding, the Company and the Guarantors will furnish to the Initial Purchasers (i) upon request and as soon as available, a copy of each report of the Company or any Guarantor mailed to stockholders generally or filed with any stock exchange or regulatory body and (ii) from time to time such other information concerning the Company or the Guarantors as the Initial Purchasers may reasonably request.

(j) The Company and the Guarantors will apply the net proceeds from the sale of the Notes to be sold by it hereunder substantially in accordance with the description set forth in the Pricing Disclosure Package and the Offering Memorandum under the caption “Use of Proceeds.”

(k) The Company, the Guarantors and their respective affiliates will not take, directly or indirectly, any action designed to or that has constituted or that reasonably would be expected to cause or result in the stabilization or manipulation of the price of any security of the Company or the Guarantors in connection with the offering of the Notes.

(l) The Company and the Guarantors will use their best efforts to permit the Notes to be eligible for clearance and settlement through DTC.

(m) The Company and the Guarantors will not, and will not permit any of their respective affiliates (as defined in Rule 144 under the Securities Act) to, resell any of the Notes that have been acquired by any of them, except for Notes purchased by the Company, the Guarantors or any of their respective affiliates and resold in a transaction registered under the Securities Act.

(n) The Company and the Guarantors agree not to sell, offer for sale or solicit offers to buy or otherwise negotiate in respect of any security (as defined in the Securities Act) that would be integrated with the sale of the Notes in a manner that would require the registration under the Securities Act of the sale to the Initial Purchasers or the Eligible Purchasers of the Notes.

(o) The Company and the Guarantors agree to comply with all the terms and conditions of the Registration Rights Agreement and all agreements set forth in the representation letters of the Company and the Guarantors to DTC relating to the approval of the Notes by DTC for “book-entry” transfer.

(p) The Company and the Guarantors will take such steps as shall be necessary to ensure that neither the Company nor any of the Company’s subsidiaries becomes an “investment company” within the meaning of such term under the Investment Company Act of 1940, as amended.

(q) Neither the Company nor any Guarantor will take any action or omit to take any action (such as issuing any press release relating to the Notes without an appropriate legend) which may result in the loss by any of the Initial Purchasers of the ability to rely on any stabilization safe harbor provided by the Financial Services Authority under the FSMA.

(r) None of the Company or any of its affiliates or any other person acting on its or their behalf (other than the Initial Purchasers, as to which no covenant is given) will (i) solicit offers for, or offer or sell, the Notes by means of any form of general solicitation or general advertising within the meaning of Rule 502(c) of Regulation D or in any manner involving a public offering within the meaning of Section 4(2) of the Securities Act or (ii) engage in any directed selling efforts within the meaning of Regulation S, and all such persons will comply with the offering restrictions requirement of Regulation S.

(s) The Company and the Guarantors will do and perform all things required or necessary to be done and performed under this Agreement by them prior to the Closing Date, and to satisfy all conditions precedent to the Initial Purchasers’ obligations hereunder to purchase the Notes.

6. Expenses. Whether or not the transactions contemplated by this Agreement are consummated or this Agreement becomes effective or is terminated, the Company and the Guarantors, jointly and severally, agree, to pay all costs, expenses, fees and taxes incident to and in connection with: (i) the preparation, printing, filing and distribution of the Preliminary Offering Memorandum, the Pricing Disclosure Package and the Offering Memorandum

(including, without limitation, financial statements and exhibits) and all amendments and supplements thereto (including the fees, disbursements and expenses of the Company’s accountants and counsel, but not, however, legal fees and expenses of the Initial Purchasers’ counsel incurred in connection therewith); (ii) the preparation, printing (including, without limitation, word processing and duplication costs) and delivery of this Agreement, the Indenture, the Registration Rights Agreement, all Blue Sky memoranda and all other agreements, memoranda, correspondence and other documents printed and delivered in connection therewith and with the Exempt Resales (but not, however, legal fees and expenses of the Initial Purchasers’ counsel incurred in connection with any of the foregoing other than fees of such counsel plus reasonable disbursements incurred in connection with the preparation, printing and delivery of such Blue Sky memoranda); (iii) the issuance and delivery by the Company of the Notes and by the Guarantors of the Guarantees and any taxes payable in connection therewith; (iv) the qualification of the Notes and Exchange Notes for offer and sale under the securities or Blue Sky laws of the several states (including, without limitation, the reasonable fees and disbursements of the Initial Purchasers’ counsel relating to such registration or qualification); (v) the furnishing of such copies of the Pricing Disclosure Package and the Offering Memorandum, and all amendments and supplements thereto, as may be reasonably requested for use in connection with the Exempt Resales; (vi) the preparation of certificates for the Notes (including, without limitation, printing and engraving thereof); (vii) the approval of the Notes by DTC for “book-entry” transfer (including fees and expenses of counsel); (viii) the rating of the Notes and the Exchange Notes; (ix) the obligations of the Trustee, any agent of the Trustee and the counsel for the Trustee in connection with the Indenture, the Notes, the Guarantees, the Exchange Notes and the Exchange Guarantees; (x) the performance by the Company and the Guarantors of their other obligations under this Agreement; and (xi) all travel expenses (including expenses related to chartered aircraft) of each Initial Purchaser and the Company’s officers and employees and any other expenses of each Initial Purchaser and the Company in connection with attending or hosting meetings with prospective purchasers of the Notes, and expenses associated with any electronic road show.

7. Conditions to Initial Purchasers’ Obligations. The respective obligations of the Initial Purchasers hereunder are subject to the accuracy, when made and on and as of the Closing Date, of the representations and warranties of the Company and the Guarantors contained herein, to the performance by the Company and the Guarantors of their respective obligations hereunder, and to each of the following additional terms and conditions:

(a) The Initial Purchasers shall not have discovered and disclosed to the Company on or prior to the Closing Date that the Pricing Disclosure Package or the Offering Memorandum, or any amendment or supplement thereto, contains an untrue statement of a fact which, in the opinion of counsel to the Initial Purchasers, is material or omits to state a fact which, in the opinion of such counsel, is material and is necessary to make the statements therein not misleading.

(b) All corporate proceedings and other legal matters incident to the authorization, form and validity of this Agreement, the Notes, the Guarantees, the Exchange Notes, the Exchange Guarantees, the Registration Rights Agreement, the Indenture, the Pricing Disclosure Package and the Offering Memorandum, and all other legal matters relating to this Agreement and the transactions contemplated hereby shall be reasonably satisfactory in all

material respects to counsel for the Initial Purchasers, and the Company and the Guarantors shall have furnished to such counsel all documents and information that they may reasonably request to enable them to pass upon such matters.

(c) ▇▇▇▇▇▇▇▇ & ▇▇▇▇▇▇ LLP shall have furnished to the Initial Purchasers its written opinion, as counsel to the Company and the Guarantors, addressed to the Initial Purchasers and dated the Closing Date, in form and substance reasonably satisfactory to the Representative.

(d) ▇▇▇▇▇ ▇▇▇▇▇▇▇, General Counsel of the Company, shall have furnished to the Initial Purchasers his written opinion, as counsel to the Company and the Guarantors, addressed to the Initial Purchasers and dated the Closing Date, in form and substance reasonably satisfactory to the Representative.

(e) The Initial Purchasers shall have received from ▇▇▇▇▇▇ & ▇▇▇▇▇▇ L.L.P., counsel for the Initial Purchasers, such opinion or opinions, dated the Closing Date, with respect to the issuance and sale of the Notes, the Pricing Disclosure Package, the Offering Memorandum and other related matters as the Initial Purchasers may reasonably require, and the Company shall have furnished to such counsel such documents and information as they reasonably request for the purpose of enabling them to pass upon such matters.

(f) At the time of execution of this Agreement, the Initial Purchasers shall have received from Deloitte & Touche LLP a letter, in form and substance satisfactory to the Initial Purchasers, addressed to the Initial Purchasers and dated the date hereof (i) confirming that they are independent public accountants within the meaning of the Securities Act and the rules of the PCAOB and are in compliance with the applicable requirements relating to the qualification of accountants under Rule 2-01 of Regulation S-X of the Commission and (ii) stating, as of the date hereof (or, with respect to matters involving changes or developments since the respective dates as of which specified financial information is given in the Pricing Disclosure Package, as of a date not more than three days prior to the date hereof), the conclusions and findings of such firm with respect to the financial information and (iii) covering such other matters as are ordinarily covered by accountants’ “comfort letters” to underwriters in connection with registered public offerings.

(g) With respect to the letter of Deloitte & Touche LLP referred to in the preceding paragraph and delivered to the Initial Purchasers concurrently with the execution of this Agreement (each, an “initial letter”), the Company shall have furnished to the Initial Purchasers a letter (each, a “bring-down letter”) of such accountants, addressed to the Initial Purchasers and dated the Closing Date (i) confirming that they were independent public accountants within the meaning of the Securities Act and the rules of the PCAOB during the periods covered by the financial statements on which they reported and are in compliance with the applicable requirements relating to the qualification of accountants under Rule 2-01 of Regulation S-X of the Commission, (ii) stating, as of the Closing Date (or, with respect to matters involving changes or developments since the respective dates as of which specified financial information is given in each of the Pricing Disclosure Package or the Offering Memorandum, as of a date not more than three days prior to the date of the Closing Date), the conclusions and findings of such firms with respect to the financial information and other matters

covered by the initial letter and (iii) confirming in all material respects the conclusions and findings set forth in the initial letter.

(h) (i) Neither the Company, any Guarantor nor any of their respective subsidiaries shall have sustained, since the date of the latest audited financial statements included in the Pricing Disclosure Package, any loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor dispute or court or governmental action, order or decree or (ii) since such date, there shall not have been any change in the capital stock or long-term debt of the Company, any Guarantor or any of their respective subsidiaries or any change, or any development involving a prospective change, in or affecting the condition (financial or otherwise), results of operations, stockholders’ equity, properties, management, business or prospects of the Company, the Guarantors and their respective subsidiaries, taken as a whole, the effect of which, in any such case described in clause (i) or (ii), is, individually or in the aggregate, in the judgment of the Representative, so material and adverse as to make it impracticable or inadvisable to proceed with the offering, sale or the delivery of the Notes being delivered on the Closing Date on the terms and in the manner contemplated in the Pricing Disclosure Package and the Offering Memorandum.

(i) At the time of execution of this Agreement, the Initial Purchasers shall have received from NSAI an initial letter (the “initial expert letter”), in form and substance satisfactory to the Initial Purchasers, addressed to the Initial Purchasers and dated the date hereof, confirming that they are independent with respect to the Company and stating the conclusions and findings of such firm with respect to matters pertaining to the Company’s use of NSAI’s report on proved reserves of the Company as of December 31, 2010, as is customary to initial purchasers in connection with similar transactions. On the Closing Date, the Initial Purchasers shall have received from NSAI a bring-down letter in form and substance satisfactory to the Initial Purchasers, addressed to the Initial Purchasers and dated as of the Closing Date, which such letter shall cover the period from the initial expert letter to the Closing Date, confirming they are independent with respect to the Company and stating the conclusions and findings of such firm with respect to matters pertaining to the Company’s use of NSAI’s report on proved reserves of the Company as of December 31, 2010, as is customary to initial purchasers in connection with similar transactions.

(j) The Company and each Guarantor shall have furnished or caused to be furnished to the Initial Purchasers on the Closing Date certificates of officers of the Company and each Guarantor satisfactory to the Initial Purchasers as to such matters as the Representative may reasonably request, including, without limitation, a statement that:

(i) The representations, warranties and agreements of the Company and the Guarantors in Section 2 are true and correct on and as of the Closing Date, and the Company and the Guarantors have complied with all its agreements contained herein and satisfied all the conditions on its part to be performed or satisfied hereunder at or prior to the Closing Date; and

(ii) They have carefully examined the Pricing Disclosure Package and the Offering Memorandum, and, in their opinion, (A) the Pricing Disclosure Package, as of the Applicable Time and as of the Closing Date, and the Offering Memorandum, as of its

date and as of the Closing Date, did not and do not contain any untrue statement of a material fact and did not and do not omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading and (B) since the date of the Pricing Disclosure Package and the Offering Memorandum, no event has occurred which should have been set forth in a supplement or amendment to the Pricing Disclosure Package of the Offering Memorandum.

(k) Subsequent to the execution and delivery of this Agreement (i) no downgrading shall have occurred in the rating accorded the Company’s debt securities by any “nationally recognized statistical rating organization,” as that term is defined by the Commission under the Exchange Act and (ii) no such organization shall have publicly announced that it has under surveillance or review, with possible negative implications, its rating of any of the Company’s debt securities.

(l) The Notes shall be eligible for clearance and settlement through DTC.

(m) The Company and the Guarantors shall have executed and delivered the Registration Rights Agreement in form and substance reasonably satisfactory to the Representative, and the Initial Purchasers shall have received an original copy thereof, duly executed by the Company and the Guarantors.

(n) The Company, the Guarantors and the Trustee shall have executed and delivered the Indenture, and the Initial Purchasers shall have received an original copy thereof, duly executed by the Company, the Guarantors and the Trustee.

(o) Subsequent to the execution and delivery of this Agreement, none of the following shall occur: (i) trading in securities generally on the New York Stock Exchange or the American Stock Exchange or in the over-the-counter market, or trading in any securities of the Company on any exchange or in the over-the-counter market, has been suspended or materially limited or the settlement of such trading generally has been materially disrupted or minimum prices has been established on any such exchange or such market by the Commission, by such exchange or by any other regulatory body or governmental authority having jurisdiction, (ii) a banking moratorium has been declared by federal or state authorities, (iii) the United States has engaged in hostilities, there has been an escalation in hostilities involving the United States or there has been a declaration by the United States of a national emergency, or there has been any calamity or crisis or war involving the United States or (iv) there has occurred such a material adverse change in general economic, political or financial conditions, including, without limitation, as a result of terrorist activities after the date hereof (or the effect of international conditions on the financial markets in the United States shall be such), as to make it, in the judgment of the Representative, impracticable or inadvisable to proceed with the offering, sale or delivery of the Notes being delivered on the Closing Date on the terms and in the manner contemplated in the Pricing Disclosure Package and the Offering Memorandum or that, in the judgment of the Representative, would materially and adversely affect the financial markets or the markets for the Notes and other debt securities.

(p) The Company shall have furnished to the Initial Purchasers a certificate, dated the Closing Date, of the Chief Financial Officer of the Company as to the Solvency of the

Company following the consummation of the issuance and sale of the Notes in accordance with the terms of this Agreement.

All opinions, letters, evidence and certificates mentioned above or elsewhere in this Agreement shall be deemed to be in compliance with the provisions hereof only if they are in form and substance reasonably satisfactory to counsel for the Initial Purchasers.

8. Indemnification and Contribution.

(a) The Company and each Guarantor, hereby agree, jointly and severally, to indemnify and hold harmless each Initial Purchaser, its affiliates, directors, officers and employees and each person, if any, who controls any Initial Purchaser within the meaning of Section 15 of the Securities Act, from and against any loss, claim, damage or liability, joint or several, or any action in respect thereof (including, but not limited to, any loss, claim, damage, liability or action relating to purchases and sales of Notes), to which that Initial Purchaser, affiliate, director, officer, employee or controlling person may become subject, under the Securities Act or otherwise, insofar as such loss, claim, damage, liability or action arises out of, or is based upon, (i) any untrue statement or alleged untrue statement of a material fact contained (A) in any Free Writing Offering Document, the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum or in any amendment or supplement thereto, (B) in any Blue Sky application or other document prepared or executed by the Company or any Guarantor (or based upon any written information furnished by the Company or any Guarantor) specifically for the purpose of qualifying any or all of the Notes under the securities laws of any state or other jurisdiction (any such application, document or information being hereinafter called a “Blue Sky Application”) or (C) in any materials or information provided to investors by, or with the approval of, the Company in connection with the marketing of the offering of the Notes (“Marketing Materials”), including any roadshow or investor presentations made to investors by the Company (whether in person or electronically) or any materials prepared for the purpose of compliance with Canadian securities laws, (ii) the omission or alleged omission to state in any Free Writing Offering Document, the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum, or in any amendment or supplement thereto, or in any Blue Sky Application or in any Marketing Materials, any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading, and shall reimburse each Initial Purchaser and each such director, officer, employee or controlling person promptly upon demand for any legal or other expenses reasonably incurred by that Initial Purchaser, director, officer, employee or controlling person in connection with investigating or defending or preparing to defend against any such loss, claim, damage, liability or action as such expenses are incurred; provided, however, that the Company and the Guarantors shall not be liable in any such case to the extent that any such loss, claim, damage, liability or action arises out of, or is based upon, any untrue statement or alleged untrue statement or omission or alleged omission made in any Preliminary Offering Memorandum, the Pricing Disclosure Package or Offering Memorandum, or in any such amendment or supplement thereto, or in any Blue Sky Application or in any Marketing Materials, in reliance upon and in conformity with written information concerning such Initial Purchaser furnished to the Company through the Representative by or on behalf of any Initial Purchaser specifically for inclusion therein, which information consists solely of the information specified in Section 8(e). The foregoing indemnity agreement is in addition to any liability that

the Company or the Guarantors may otherwise have to any Initial Purchaser or to any director, officer, employee or controlling person of that Initial Purchaser.

(b) Each Initial Purchaser, severally and not jointly, hereby agrees to indemnify and hold harmless the Company, each Guarantor, their respective officers and employees, each of their respective directors, and each person, if any, who controls the Company or any Guarantor within the meaning of Section 15 of the Securities Act, from and against any loss, claim, damage or liability, joint or several, or any action in respect thereof, to which the Company, any Guarantor or any such director, officer, employee or controlling person may become subject, under the Securities Act or otherwise, insofar as such loss, claim, damage, liability or action arises out of, or is based upon, (i) any untrue statement or alleged untrue statement of a material fact contained (A) in any Free Writing Offering Document, the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum or in any amendment or supplement thereto, (B) in any Blue Sky Application, or (C) in any Marketing Materials or (ii) the omission or alleged omission to state in any Free Writing Offering Document, the Preliminary Offering Memorandum, the Pricing Disclosure Package or the Offering Memorandum, or in any amendment or supplement thereto, or in any Blue Sky Application or in any Marketing Materials any material fact necessary to make the statements therein not misleading, but in each case only to the extent that the untrue statement or alleged untrue statement or omission or alleged omission was made in reliance upon and in conformity with written information concerning such Initial Purchaser furnished to the Company through the Representative by or on behalf of that Initial Purchaser specifically for inclusion therein, which information is limited to the information set forth in Section 8(e). The foregoing indemnity agreement is in addition to any liability that any Initial Purchaser may otherwise have to the Company, any Guarantor or any such director, officer, employee or controlling person.

(c) Promptly after receipt by an indemnified party under this Section 8 of notice of any claim or the commencement of any action, the indemnified party shall, if a claim in respect thereof is to be made against the indemnifying party under this Section 8, notify the indemnifying party in writing of the claim or the commencement of that action; provided, however, that the failure to notify the indemnifying party shall not relieve it from any liability that it may have under Section 8(a) or 8(b) except to the extent it has been materially prejudiced by such failure and; provided, further, that the failure to notify the indemnifying party shall not relieve it from any liability that it may have to an indemnified party otherwise than under Section 8(a) or 8(b). If any such claim or action shall be brought against an indemnified party, and it shall notify the indemnifying party thereof, the indemnifying party shall be entitled to participate therein and, to the extent that it wishes, jointly with any other similarly notified indemnifying party, to assume the defense thereof with counsel reasonably satisfactory to the indemnified party. After notice from the indemnifying party to the indemnified party of its election to assume the defense of such claim or action, the indemnifying party shall not be liable to the indemnified party under this Section 8 for any legal or other expenses subsequently incurred by the indemnified party in connection with the defense thereof other than reasonable costs of investigation; provided, however, that the Initial Purchasers shall have the right to employ counsel to represent jointly the Initial Purchasers and their respective directors, officers, employees and controlling persons who may be subject to liability arising out of any claim in respect of which indemnity may be sought by the Initial Purchasers against the Company or any Guarantor under this Section 8, if (i) the Company, the Guarantors and the Initial Purchasers

shall have so mutually agreed; (ii) the Company and the Guarantors have failed within a reasonable time to retain counsel reasonably satisfactory to the Initial Purchasers; (iii) the Initial Purchasers and their respective affiliates, directors, officers, employees and controlling persons shall have reasonably concluded, based on the advice of counsel, that there may be legal defenses available to them that are different from or in addition to those available to the Company and the Guarantors; or (iv) the named parties in any such proceeding (including any impleaded parties) include both the Initial Purchasers or their respective affiliates, directors, officers, employees or controlling persons, on the one hand, and the Company and the Guarantors, on the other hand, and representation of both sets of parties by the same counsel would present a conflict due to actual or potential differing interests between them, and in any such event the fees and expenses of such separate counsel shall be paid by the Company and the Guarantors. No indemnifying party shall (i) without the prior written consent of the indemnified parties (which consent shall not be unreasonably withheld), settle or compromise or consent to the entry of any judgment with respect to any pending or threatened claim, action, suit or proceeding in respect of which indemnification or contribution may be sought hereunder (whether or not the indemnified parties are actual or potential parties to such claim or action) unless such settlement, compromise or consent includes an unconditional release of each indemnified party from all liability arising out of such claim, action, suit or proceeding and does not include any statement as to or admission of fault, culpability or failure to act by or on behalf of any indemnified party, or (ii) be liable for any settlement of any such action effected without its written consent (which consent shall not be unreasonably withheld), but if settled with the consent of the indemnifying party or if there be a final judgment of the plaintiff in any such action, the indemnifying party agrees to indemnify and hold harmless any indemnified party from and against any loss or liability by reason of such settlement or judgment.

(d) If the indemnification provided for in this Section 8 shall for any reason be unavailable to or insufficient to hold harmless an indemnified party under Section 8(a) or 8(b) in respect of any loss, claim, damage or liability, or any action in respect thereof, referred to therein, then each indemnifying party shall, in lieu of indemnifying such indemnified party, contribute to the amount paid or payable by such indemnified party as a result of such loss, claim, damage or liability, or action in respect thereof, (i) in such proportion as shall be appropriate to reflect the relative benefits received by the Company and the Guarantors, on the one hand, and the Initial Purchasers, on the other, from the offering of the Notes 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 and the Guarantors, on the one hand, and the Initial Purchasers, on the other, with respect to the statements or omissions that resulted in such loss, claim, damage or liability, or action in respect thereof, as well as any other relevant equitable considerations. The relative benefits received by the Company and the Guarantors, on the one hand, and the Initial Purchasers, on the other, with respect to such offering shall be deemed to be in the same proportion as the total net proceeds from the offering of the Notes purchased under this Agreement (before deducting expenses) received by the Company and the Guarantors, on the one hand, and the total discounts and commissions received by the Initial Purchasers with respect to the Notes purchased under this Agreement, on the other hand, bear to the total gross proceeds from the offering of the Notes under this Agreement. The relative fault shall be determined by reference to whether the untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact relates to information supplied by the Company, the

Guarantors, or the Initial Purchasers, the intent of the parties and their relative knowledge, access to information and opportunity to correct or prevent such statement or omission. For purposes of the preceding two sentences, the net proceeds deemed to be received by the Company shall be deemed to be also for the benefit of the Guarantors, and information supplied by the Company shall also be deemed to have been supplied by the Guarantors. The Company, the Guarantors, and the Initial Purchasers agree that it would not be just and equitable if contributions pursuant to this Section 8(d) were to be determined by pro rata allocation (even if the Initial Purchasers were treated as one entity for such purpose) or by any other method of allocation that does not take into account the equitable considerations referred to herein. The amount paid or payable by an indemnified party as a result of the loss, claim, damage or liability, or action in respect thereof, referred to above in this Section 8(d) shall be deemed to include, for purposes of this Section 8(d), any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 8(d), no Initial Purchaser shall be required to contribute any amount in excess of the amount by which the net proceeds from the sale to Eligible Purchasers of the Notes initially purchased by it exceeds the amount of any damages that such Initial Purchaser has otherwise paid or become liable to pay by reason of any untrue or alleged untrue statement or omission or alleged omission. 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 Initial Purchasers’ obligations to contribute as provided in this Section 8(d) are several in proportion to their respective purchase obligations and not joint.

(e) The Initial Purchasers severally confirm and the Company and the Guarantors acknowledge and agree that the marketing names of the Initial Purchasers appearing on the front cover of the Offering Memorandum, and the third paragraph, the fourth and fifth sentences of the eleventh paragraph and the thirteenth paragraph of the section entitled “Plan of Distribution” in the Pricing Disclosure Package and the Offering Memorandum are correct and constitute the only information concerning such Initial Purchasers furnished in writing to the Company or any Guarantor by or on behalf of the Initial Purchasers specifically for inclusion in the Preliminary Offering Memorandum, the Pricing Disclosure Package and the Offering Memorandum or in any amendment or supplement thereto or in any Blue Sky Application or in any marketing materials.

9. Defaulting Initial Purchasers. If, on the Closing Date, any Initial Purchaser defaults in the performance of its obligations under this Agreement, the remaining non-defaulting Initial Purchasers shall be obligated to purchase the Notes that the defaulting Initial Purchaser agreed but failed to purchase on the Closing Date in the respective proportions that the number of Notes set opposite the name of each remaining non-defaulting Initial Purchaser in Schedule I hereto bears to the total number of Notes set opposite the names of all the remaining non-defaulting Initial Purchasers in Schedule I hereto; provided, however, that the remaining non-defaulting Initial Purchasers shall not be obligated to purchase any of the Notes on the Closing Date if the aggregate principal amount of Notes that the defaulting Initial Purchaser or Initial Purchasers agreed but failed to purchase on such date exceeds 9.09% of the aggregate principal amount of Notes to be purchased on the Closing Date, and any remaining non-defaulting Initial Purchasers shall not be obligated to purchase more than 110% of the aggregate principal amount of Notes that it agreed to purchase on the Closing Date pursuant to the terms of

Section 3. If the foregoing maximums are exceeded, the remaining non-defaulting Initial Purchasers, or those other Initial Purchasers satisfactory to the Initial Purchasers who so agree, shall have the right, but shall not be obligated, to purchase, in such proportion as may be agreed upon among them, all the Notes to be purchased on the Closing Date. If the remaining Initial Purchasers or other Initial Purchasers satisfactory to the Initial Purchasers do not elect to purchase the Notes that the defaulting Initial Purchaser or Initial Purchasers agreed but failed to purchase on the Closing Date, this Agreement shall terminate without liability on the part of any non-defaulting Initial Purchaser or the Company or the Guarantors, except that the Company and the Guarantors will continue to be liable for the payment of expenses to the extent set forth in Sections 6, 8 and 11. As used in this Agreement, the term “Initial Purchaser” includes, for all purposes of this Agreement unless the context requires otherwise, any party not listed in Schedule I hereto that, pursuant to this Section 9, purchases Notes that a defaulting Initial Purchaser agreed but failed to purchase.

Nothing contained herein shall relieve a defaulting Initial Purchaser of any liability it may have to the Company or any Guarantor for damages caused by its default. If other Initial Purchasers are obligated or agree to purchase the Notes of a defaulting or withdrawing Initial Purchaser, either the remaining Initial Purchasers or the Company may postpone the Closing Date for up to seven full business days in order to effect any changes that in the opinion of counsel for the Company or counsel for the Initial Purchasers may be necessary in the Pricing Disclosure Package, the Offering Memorandum or in any other document or arrangement.

10. Termination. The obligations of the Initial Purchasers hereunder may be terminated by the Initial Purchasers by notice given to and received by the Company prior to delivery of and payment for the Notes if, prior to that time, any of the events described in Sections 7(i) or (o) shall have occurred or if the Initial Purchasers shall decline to purchase the Notes for any reason permitted under this Agreement.

11. Reimbursement of Initial Purchasers’ Expenses. If (a) the Company fails to tender the Notes for delivery to the Initial Purchasers for any reason or (b) the Initial Purchasers shall decline to purchase the Notes for any reason permitted under this Agreement, the Company and the Guarantors shall jointly and severally reimburse the Initial Purchasers for all reasonable out-of-pocket expenses (including fees and disbursements of counsel) incurred by the Initial Purchasers in connection with this Agreement and the proposed purchase of the Notes, and upon demand the Company and the Guarantors shall pay the full amount thereof to the Initial Purchasers. If this Agreement is terminated pursuant to Section 10 by reason of the default of one or more Initial Purchasers, the Company and the Guarantors shall not be obligated to reimburse any defaulting Initial Purchaser on account of those expenses.

12. Notices, Etc. All statements, requests, notices and agreements hereunder shall be in writing, and:

(a) if to any Initial Purchaser, shall be delivered or sent by hand delivery, mail, telex, overnight courier or facsimile transmission to the Representative c/▇ ▇▇▇▇▇ Fargo Securities, LLC, ▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇;

(b) if to the Company or any Guarantor, shall be delivered or sent by mail, telex, overnight courier or facsimile transmission to the address of the Company set forth in the Pricing Disclosure Package, Attention: ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇, Executive Vice-President and General Counsel (Fax: ▇▇▇-▇▇▇-▇▇▇▇);

provided, however, that any notice to an Initial Purchaser pursuant to Section 8(c) shall be delivered or sent by hand delivery, mail, telex or facsimile transmission to such Initial Purchaser at its address set forth in its acceptance telex to ▇▇▇▇▇ Fargo Securities, LLC, which address will be supplied to any other party hereto by ▇▇▇▇▇ Fargo Securities, LLC upon request. Any such statements, requests, notices or agreements shall take effect at the time of receipt thereof. The Company shall be entitled to act and rely upon any request, consent, notice or agreement given or made on behalf of the Initial Purchasers by ▇▇▇▇▇ Fargo Securities, LLC.

(c) Persons Entitled to Benefit of Agreement. This Agreement shall inure to the benefit of and be binding upon the Initial Purchasers, the Company, the Guarantors and their respective successors. This Agreement and the terms and provisions hereof are for the sole benefit of only those persons, except that the representations, warranties, indemnities and agreements of the Company and the Guarantors contained in this Agreement shall also be deemed to be for the benefit of the affiliates, directors, officers and employees of the Initial Purchasers and each person or persons, if any, controlling any Initial Purchaser within the meaning of Section 15 of the Securities Act. Nothing in this Agreement is intended or shall be construed to give any person, other than the persons referred to in this Section 13, any legal or equitable right, remedy or claim under or in respect of this Agreement or any provision contained herein.

(d) Survival. The respective indemnities, representations, warranties and agreements of the Company, the Guarantors and the Initial Purchasers contained in this Agreement or made by or on behalf on them, respectively, pursuant to this Agreement, shall survive the delivery of and payment for the Notes and shall remain in full force and effect, regardless of any investigation made by or on behalf of any of them or any person controlling any of them. If this Agreement is terminated pursuant to Section 10 or if for any reason the purchase of the Notes by the Initial Purchasers is not consummated, the indemnities set forth in Section 8 hereof shall at all times be effective and shall survive such termination.

(e) Definition of the Terms “Business Day,” “Affiliate” and “Subsidiary.” For purposes of this Agreement, (a) “business day” means any day on which the New York Stock Exchange, Inc. is open for trading and (b) “affiliate” and “subsidiary” have the meanings set forth in Rule 405 under the Securities Act.

(f) Governing Law. This Agreement shall be governed by and construed in accordance with the laws of New York.

(g) No Fiduciary Duty. The Company and the Guarantors acknowledge and agree that in connection with this offering, or any other services the Initial Purchasers may be deemed to be providing hereunder, notwithstanding any preexisting relationship, advisory or otherwise, between the parties or any oral representations or assurances previously or subsequently made by the Initial Purchasers: (i) no fiduciary or agency relationship between the

Company, any Guarantor and any other person, on the one hand, and the Initial Purchasers, on the other, exists; (ii) the Initial Purchasers are not acting as advisors, expert or otherwise, to the Company or the Guarantors, including, without limitation, with respect to the determination of the purchase price of the Notes, and such relationship between the Company and the Guarantors, on the one hand, and the Initial Purchasers, on the other, is entirely and solely commercial, based on arms-length negotiations; (iii) any duties and obligations that the Initial Purchasers may have to the Company and the Guarantors shall be limited to those duties and obligations specifically stated herein; and (iv) the Initial Purchasers and their respective affiliates may have interests that differ from those of the Company and the Guarantors. The Company and the Guarantors hereby waive any claims that the Company and the Guarantors may have against the Initial Purchasers with respect to any breach of fiduciary duty in connection with the Notes.

(h) Counterparts. This Agreement may be executed in one or more counterparts and, if executed in more than one counterpart, the executed counterparts shall each be deemed to be an original but all such counterparts shall together constitute one and the same instrument.

(i) Headings. The headings herein are inserted for convenience of reference only and are not intended to be part of, or to affect the meaning or interpretation of, this Agreement.

[Signature pages follow.]

If the foregoing correctly sets forth the agreement among the Company, the Guarantors, and the Initial Purchasers, please indicate your acceptance in the space provided for that purpose below.

		Very truly yours,

		PETROHAWK ENERGY CORPORATION


		By:	/s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
			▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
			Executive Vice President — General Counsel
			and Secretary


		GUARANTORS

		PETROHAWK OPERATING COMPANY
		P-H ENERGY, LLC
		HAWK FIELD SERVICES, L.L.C.
		WINWELL RESOURCES, L.L.C.
		WSF, INC.
		KCS RESOURCES, LLC
		KCS ENERGY SERVICES, INC.
		MEDALLION CALIFORNIA PROPERTIES
			COMPANY
		ONE TEC, LLC
		ONE TEC OPERATING, LLC
		PETROHAWK HOLDINGS LLC
		HK TRANSPORTATION LLC


		By:	/s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
			▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
			Executive Vice President — General Counsel

Signature Page to Purchase Agreement

		H-K ENERGY MARKETING, LLC
		BIG HAWK SERVICES, LLC
		FRACHAWK SERVICES, LLC


		By:	/s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
			▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
			Secretary


		PETROHAWK PROPERTIES, LP

		By:	P-H Energy, LLC
			Its General Partner


		By:	/s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
			▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
			Executive Vice President — General Counsel
			and Secretary

Signature Page to Purchase Agreement

Agreed to and accepted as of the date first written above.

▇▇▇▇▇ FARGO SECURITIES, LLC
For itself and as Representative of the several
Initial Purchasers named on Schedule I hereto.

By:	/s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇
	Authorized Signatory

Signature Page to Purchase Agreement

SCHEDULE I

Initial Purchaser	Principal Amount of Notes
▇▇▇▇▇ Fargo Securities, LLC	$	108,000,000
Barclays Capital Inc.	42,000,000
BMO Capital Markets Corp.	42,000,000
BNP Paribas Securities Corp.	42,000,000
▇▇▇▇▇▇▇, Sachs & Co	54,000,000
▇.▇. ▇▇▇▇▇▇ Securities LLC	42,000,000
▇▇▇▇▇▇▇ Lynch, Pierce, ▇▇▇▇▇▇ & ▇▇▇▇▇ Incorporated	42,000,000
RBC Capital Markets, LLC	42,000,000
Capital One Southcoast, Inc.	18,000,000
Credit Agricole Securities (USA) Inc.	18,000,000
Credit Suisse Securities (USA) LLC	24,000,000
Deutsche Bank Securities Inc.	24,000,000
▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated	18,000,000
UBS Securities LLC	18,000,000
Citigroup Global Markets Inc.	12,000,000
ING Financial Markets LLC	12,000,000
KeyBanc Capital Markets Inc.	6,000,000
Mizuho Securities USA Inc.	6,000,000
Natixis Securities North America Inc.	12,000,000
Scotia Capital (USA) Inc.	6,000,000
SMBC Nikko Capital Markets Limited	6,000,000
SunTrust ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇, Inc.	6,000,000
Total	$	600,000,000

I-1

SCHEDULE II

GUARANTORS

Petrohawk Operating Company

P-H Energy, LLC

Hawk Field Services, LLC

Petrohawk Properties, LP

Winwell Resources, L.L.C.

WSF, Inc.

KCS Resources, LLC

KCS Energy Services, Inc.

Medallion California Properties Company

One Tec, LLC

One Tec Operating, LLC

Petrohawk Holdings LLC

HK Energy Marketing, LLC

HK Transportation, LLC

Big Hawk Services, LLC

FracHawk Services, LLC

II-1

SCHEDULE III

PETROHAWK ENERGY CORPORATION

$600,000,000 6.25% SENIOR NOTES DUE 2019

Pricing Term Sheet

Pricing Supplement dated May 17, 2011 to the Preliminary Offering Memorandum dated May 17, 2011 of Petrohawk Energy Corporation. This Pricing Supplement is qualified in its entirety by reference to the Preliminary Offering Memorandum. The information in this Pricing Supplement supplements the Preliminary Offering Memorandum and supersedes the information in the Preliminary Offering Memorandum to the extent it is inconsistent with the information in the Preliminary Offering Memorandum. Capitalized terms used in this Pricing Supplement but not defined have the meanings given them in the Preliminary Offering Memorandum.

Issuer		Petrohawk Energy Corporation

Guarantors		The notes will be initially guaranteed on a senior unsecured basis by the Issuer’s existing, material wholly-owned subsidiaries

Title of Securities		6.250% Senior Notes due ▇▇▇▇

▇▇▇▇▇▇▇▇▇ Principal Amount		$600,000,000

Gross Proceeds		$600,000,000

Net Proceeds (after expenses)		$589,250,000

Distribution		144A/RegS w/ Registration Rights

Maturity Date		June 1, 2019

Issue Price		100.000%

Coupon		6.250%

Yield to Maturity		6.250%

Spread to Benchmark Treasury		+356 basis points

Benchmark Treasury		UST 3.125% due May 15, 2019

Interest Payment Dates		Each June 1 and December 1 of each year, beginning on December 1, 2011.

III-1

Record Dates		May 15 and November 15 of each year

Trade Date		May 17, 2011

Settlement Date		May 20, 2011 (T+3)

Make-Whole Redemption		Make-whole redemption at Treasury Rate +50 bps prior to June 1, 2015

Optional Redemption		On or after June 1, 2015, at the following redemption prices (expressed as a percentage of principal amount), plus accrued and unpaid interest, if any, on the Notes redeemed during the twelve-month period indicated beginning on June 1 of the years indicated below:

Year	Price

2015	103.125	%

2016	101.563	%

2017 and thereafter	100.000	%

Equity Clawback		Up to 35% at 106.250% on or prior to June 1, 2014

Change of Control		Put @ 101% of principal plus accrued interest

Joint Book-Running Managers		▇▇▇▇▇ Fargo Securities, LLC Barclays Capital Inc. BMO Capital Markets Corp. BNP Paribas Securities Corp. ▇▇▇▇▇▇▇, Sachs & Co. ▇.▇. ▇▇▇▇▇▇ Securities LLC ▇▇▇▇▇▇▇ Lynch, Pierce, ▇▇▇▇▇▇ & ▇▇▇▇▇ Incorporated RBC Capital Markets, LLC
Senior Co-Managers		Capital One Southcoast, Inc. Credit Agricole Securities (USA) Inc. Credit Suisse Securities (USA) LLC Deutsche Bank Securities Inc. ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated UBS Securities LLC
Co- Managers		Citigroup Global Markets Inc. ING Financial Markets LLC KeyBanc Capital Markets Inc. Mizuho Securities USA Inc.

III-2

		Natixis Securities North America Inc. Scotia Capital (USA) Inc. SMBC Nikko Capital Markets Limited SunTrust ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇, Inc.
CUSIP / ISIN Numbers		Rule 144A: 716495 AM8 / US716495AM80

		Regulation S: U71618 AF6 / USU71618AF68

Denominations		Minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof

This material is strictly confidential and has been prepared by the Issuer solely for use in connection with the proposed offering of the securities described in the Preliminary Offering Memorandum. This material is personal to each offeree and does not constitute an offer to any other person or the public generally to subscribe for or otherwise acquire the securities. Please refer to the Preliminary Offering Memorandum for a complete description.

The securities have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), and are being offered only to (1) “qualified institutional buyers” as defined in Rule 144A under the Securities Act and (2) outside the United States to non-U.S. persons in compliance with Regulation S under the Securities Act, and this communication is only being distributed to such persons.

This communication is not an offer to sell the securities and it is not a solicitation of an offer to buy the securities in any jurisdiction to any person to whom it is unlawful to make such offer or solicitation in such jurisdiction.

Any disclaimer or other notice that may appear below is not applicable to this communication and should be disregarded. Such disclaimer or notice was automatically generated as a result of this communication being sent by Bloomberg or another email system.

III-3

SCHEDULE IV

(a) Free Writing Offering Documents and other documents that comprise the Pricing Disclosure Package:

Term sheet containing the terms of the securities, substantially in the form of Schedule III.

(b) Free Writing Offering Documents not included in the Pricing Disclosure Package

None.

IV-1

SCHEDULE V

OTHER ENTITIES

KinderHawk Field Services LLC

EagleHawk Services, LLC

FracHawk Services, LLC

V-1

SCHEDULE VI

	Subsidiary	Jurisdiction of Organization
1.	Petrohawk Operating Company	Texas
2.	P-H Energy, LLC	Texas
3.	Petrohawk Holdings, LLC	Delaware
4.	Petrohawk Properties, LP	Texas
5.	Winwell Resources, LLC	Louisiana
6.	WSF, Inc.	Louisiana
7.	KCS Resources, LLC	Delaware
8.	KCS Energy Services, Inc.	Delaware
9.	One TEC, LLC	Texas
10.	One TEC Operating, LLC	Texas
11.	HK Energy Marketing, LLC	Delaware
12.	Hawk Field Services, LLC	Oklahoma
13.	Medallion California Properties Company	Texas
14.	HK Transportation, LLC	Oklahoma
15.	Big Hawk Services, LLC	Delaware

VI-1

PETROHAWK ENERGY CORPORATION 6.25% SENIOR NOTES DUE 2019 PURCHASE AGREEMENT

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