Contango Oil & Gas (MCF) 8-K Contango Announces the Sale of its Western Core Fayetteville Shale Properties

EXHIBIT 2.1

ASSET PURCHASE AGREEMENT

BY AND AMONG

PETROHAWK ENERGY CORPORATION

AND

CONTANGO GAS SOLUTIONS, L.P.,

ALTA RESOURCES, L.L.C.,

GPM ENERGY, LLC,

MND PARTNERS, L.P. AND

TEPEE PETROLEUM COMPANY, INC.

As of November 26, 2007

Strictly Confidential

TABLE OF CONTENTS

ARTICLE I PURCHASE AND SALE OF ASSETS		1
1.1	Purchased Assets	1
1.2	Excluded Assets	2
1.3	Assumed Liabilities	3
1.4	Excluded Liabilities	3
1.5	Purchase Price	3
1.6	Allocated Values	3
1.7	Adjustments to Purchase Price	3
1.8	Termination for Reduction	4
1.9	Closing Date Adjustment to Purchase Price	4
1.10	Post-Closing Adjustments to Purchase Price	5
1.11	Additional Proceeds	7
ARTICLE II CLOSING		7
2.1	The Closing	7
2.2	Deliveries by Sellers at the Closing	7
2.3	Deliveries by Buyer at the Closing	8
2.4	Proceedings at Closing	8
ARTICLE III REPRESENTATIONS AND WARRANTIES OF SELLERS		8
3.1	Organization and Qualification	8
3.2	Authority; Binding Effect	8
3.3	Governmental Entities	9
3.4	No Conflicts	9
3.5	Contracts; Leases	9
3.6	Title to Equipment	10
3.7	Oil and Gas Interests	10
3.8	No Litigation	10
3.9	Brokers’ Fees	11
3.10	Books and Records	11
3.11	Disclaimer	11
3.12	Preference Rights and Transfer Requirements	11
3.13	Taxes and Assessments	11
3.14	Condemnation	12
3.15	Bankruptcy	12
3.16	Production Allowables	12
3.17	Foreign Person	12
3.18	Collective Bargaining Agreements	12
3.19	Compliance with Laws	12
3.20	Outstanding Capital Commitments	12
ARTICLE IV REPRESENTATIONS AND WARRANTIES OF BUYER		12
4.1	Organization and Qualification	13

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4.2	Authority; Binding Effect	13
4.3	Governmental Entities	13
4.4	No Conflicts	13
4.5	No Litigation	14
4.6	Brokers’ Fees	14
4.7	Disclaimer	14
ARTICLE V COVENANTS		14
5.1	Closing Efforts	14
5.2	Governmental and Third-Party Notices and Consents	14
5.3	Operation of Businesses of Sellers	15
5.4	Expenses	16
5.5	Notification	16
5.6	Access to Information	16
5.7	Bulk Sales Laws	17
5.8	Access to Purchased Assets, Books and Records	17
5.9	Further Assurances	18
5.10	Delivery of Books and Records to Buyer	18
5.11	Tax Matters	18
5.12	Letters in Lieu; Assignments; Operatorship	19
ARTICLE VI TITLE MATTERS		20
6.1	Title Information	20
6.2	Defensible Title	20
6.3	Defensible Title; Development Acreage	20
6.4	Allocated Value	20
6.5	Permitted Encumbrances	20
6.6	Title Defect	21
6.7	Title Defect Value	22
6.8	Title Defect Notice	22
6.9	Assumed Title Liabilities	23
6.10	Reasonable Documentation	23
6.11	Sellers’ Options	23
6.12	Adjustment to Purchase Price; Threshold and Deductible	24
6.13	Exclusions of Wells	24
6.14	Preference Rights and Transfer Requirements	24
ARTICLE VII CONDITIONS TO CLOSING		26
7.1	Conditions to Each Party’s Obligations	26
7.2	Conditions to Obligations of Buyer	26
7.3	Conditions to Obligations of Sellers	27
ARTICLE VIII INDEMNIFICATION		28
8.1	Indemnification by Sellers	28
8.2	Indemnification by Buyer	28
8.3	Indemnification Claims	29
8.4	Survival of Representations, Warranties and Covenants	32

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8.5	Limitations	32
8.6	Treatment of Indemnification Payments	33
ARTICLE IX TERMINATION		33
9.1	Termination	33
9.2	Effect of Termination	34
9.3	Remedies	34
ARTICLE X DEFINITIONS		35
ARTICLE XI MISCELLANEOUS		43
11.1	Press Releases and Announcements	43
11.2	No Third Party Beneficiaries	43
11.3	Like-Kind Exchanges	43
11.4	Entire Agreement	43
11.5	Succession and Assignment	43
11.6	Counterparts and Facsimile Signature	43
11.7	Headings	44
11.8	Notices	44
11.9	Governing Law	46
11.10	Amendments and Waivers	46
11.11	Severability	46
11.12	Submission to Jurisdiction	46
11.13	Construction	47

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Schedules and Exhibits

Schedule 1.2(g)	—	Excluded Assets
Schedule 1.5	—	Sellers’ Allocation
Schedule 3.3	—	Governmental Approvals
Schedule 3.4	—	No Conflicts; Exceptions
Schedule 3.5	—	Contracts; Leases
Schedule 3.7(a)	—	Oil and Gas Interests
Schedule 3.7(d)	—	Liens
Schedule 3.8	—	No Litigation; Exceptions
Schedule 3.9	—	Brokers’ Fees; Exceptions
Schedule 3.12	—	Preference Rights and Transfer Requirements
Schedule 3.13	—	Taxes and Assessments
Schedule 3.19	—	Compliance with Laws
Schedule 3.20	—	Outstanding Capital Commitments
Schedule 4.3	—	Governmental Approvals
Schedule 4.4	—	No Conflicts; Exceptions
Schedule 4.6	—	Brokers’ Fees; Exceptions
Schedule 5.3	—	Pre-Closing Operation of Business
Schedule 6.6	—	Title Defects

Exhibit A	Leases
Exhibit B	Wells
Exhibit C	Equipment
Exhibit D	Allocated Values

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Exhibit E	Intentionally Omitted
Exhibit F	Form of Assignment and Bill of Sale
Exhibit G	Form of ORRI Assignment

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ASSET PURCHASE AGREEMENT

Asset Purchase Agreement (this “Agreement”) entered into as of November 26, 2007 by and among Contango Gas Solutions, L.P., a Texas limited partnership (“Contango”), Alta Resources, L.L.C., a Texas limited liability company (“Alta”), GPM Energy, LLC, a Texas limited liability company (“GPM”), MND Partners, L.P., a Texas limited partnership (“MND”) and Tepee Petroleum Company, Inc., a Texas corporation (“Tepee”), and Petrohawk Energy Corporation, a Delaware corporation (“Buyer”). Contango, Alta, GPM, MND and Tepee are hereinafter sometimes referred to collectively as the “Sellers” and individually as a “Seller.”

WITNESSETH

WHEREAS, Sellers own interests in certain oil and gas leases and related assets in the State of Arkansas;

WHEREAS, the parties hereto desire that Sellers sell, assign, transfer, convey and deliver to Buyer, and that Buyer purchase and acquire from Sellers, all of Sellers’ right, title and interest in and to the oil and gas leases and related assets as set forth herein, and that Buyer assume certain of the liabilities associated therewith, all on the terms and subject to the conditions set forth in this Agreement.

NOW THEREFORE, in consideration of the representations, warranties, covenants, promises and the mutual agreements contained herein, the Parties agree as follows:

ARTICLE I

PURCHASE AND SALE OF ASSETS

1.1Purchased Assets. On the terms and subject to the conditions set forth in this Agreement, at the Closing each of the Sellers agrees to sell, transfer and assign to Buyer, and Buyer shall purchase and receive, all of Sellers’ right, title and interest in and to the following (the “Purchased Assets”):

(a)Leases. All of the oil and gas leases; subleases and other leaseholds; carried interests; reversionary interests; farmout rights; options; and other properties and interests described onExhibit A, subject to such depth limitations and other restrictions as may be set forth in the oil and gas leases or other agreements of record, together with each and every kind and character of right, title, claim, and interest that Sellers have in and to the lands covered thereby and the interests currently pooled, unitized, communitized or consolidated therewith (each, a “Lease” and sometimes, collectively, the “Leases”);

(b)Wells. All oil, gas, and/or injection wells, whether producing, operating, shut-in or temporarily abandoned, located on the lands covered by the Leases or pooled therewith, including, without limitation, those described inExhibit B (each, a “Well” and sometimes, collectively, the “Wells”);

(c)Equipment. All equipment, fixtures, machinery, tanks, pipelines, gathering lines, flow lines, saltwater and other disposal wells, and other appurtenances and all other personal property or fixtures that are located on the lands covered by the Leases or pooled

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therewith and used in connection with the ownership or operation thereof and the production of oil and/or gas therefrom, including, without limitation, those described inExhibit C, but specifically excluding those listed onSchedule 1.2(g) attached hereto (collectively, the “Equipment”);

(d)Contracts. All contracts, agreements (other than the Participation Agreement and the Farmout Agreement), leases (other than the Leases), rights-of-way, easements, servitudes, surface leases, permits, licenses, title instruments and other similar rights, only to the extent attributable to and affecting, the Leases, Wells and Equipment, including all hydrocarbon sales, purchase, gathering, transportation, treating, storage, compression, marketing, exchange, processing and fractionating contracts or agreements, division orders and joint operating agreements (each an “Assigned Contract” and, collectively, the “Assigned Contracts”);

(e)Seismic and Other Data. To the extent owned or licensed by such Seller and transferable without payment of transfer fees, or to the extent Buyer agrees to pay a third party for applicable transfer fees, any seismic data, interpretations or analyses based thereon, relating to the lands covered by the Leases or pooled therewith, together with any data, studies, compilations, engineering or data or other information relating to reserves or otherwise pertaining or relating to the Wells and Leases;

(f)Books and Records. All books, files, abstracts, title opinions, evaluations, data, maps, outputs, and records of such Seller related to the operation or ownership of the Purchased Assets.

1.2Excluded Assets. The Purchased Assets do not include, and Sellers shall not sell, transfer or assign to Buyer, and Buyer shall not purchase, acquire or accept any assets of Sellers other than the Purchased Assets (the “Excluded Assets”), including, without limitation,

(a) the corporate seals, minute books, stock books, Tax Returns, books of account or other records having to do with the corporate, limited liability company or partnership organization of Sellers;

(b) accounts receivable relating to any operation or ownership of the Purchased Assets for periods prior to the Effective Time;

(c) oil and liquid hydrocarbon inventories in tanks above the pipeline connections as of the Effective Time and any and all revenues attributable thereto;

(d) gas produced through designated sales meters prior to the Effective Time and any and all revenues attributable thereto;

(e) the shares of capital stock, limited liability company membership interests or partnership interests of Sellers, as applicable;

(f) the rights which accrue or will accrue to Sellers under this Agreement, the Participation Agreement, the Farmout Agreement, the Seller Related Documents and the Buyer Related Documents; and

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(g) the assets, properties and rights specifically set forth onSchedule 1.2(g).

1.3Assumed Liabilities. Upon the terms and subject to the conditions of this Agreement, Buyer shall assume and become responsible for all of the Assumed Liabilities effective as of the Effective Time.

1.4Excluded Liabilities. Buyer shall not assume any Excluded Liabilities. “Excluded Liabilities” are any Liabilities of Sellers other than the Assumed Liabilities.

1.5Purchase Price. As consideration for the sale of the Purchased Assets, the aggregate consideration to be paid by Buyer to Seller shall be subject to (i) adjustment in accordance withSections 1.7,1.8 and1.10, Three Hundred Forty Three Million Dollars ($343,000,000) (the “Purchase Price”), payable on the Closing Date by wire transfer of immediately available funds to the accounts designated by Sellers to Buyer and allocated amongst the Sellers in the form set forth onSchedule 1.5no later than December 17, 2007, and (ii) the assumption of Assumed Liabilities.

1.6Allocated Values. The Purchase Price shall be allocated to the Purchased Assets in accordance with the values set forth inExhibit D attached hereto and made a part hereof. The Purchase Price shall be allocated to the Leases and Wells in accordance with the values set forth inExhibit D, subject to reduction and increase of such values pursuant toArticle VI. Such values (singularly, the “Allocated Value,” and collectively, the “Allocated Values”) shall be binding for purposes of adjusting the Purchase Price pursuant toArticle VI.

1.7Adjustments to Purchase Price.

(a) The Purchase Price shall be adjusted as follows:

(i) The Purchase Price shall be increased by the sum of the following:

(A) an amount equal to any and all ad valorem, property, production, excise, severance and similar taxes and assessments based upon or measured by the ownership of the Purchased Assets paid by or on behalf of Sellers that are attributable to periods of time from and after the Effective Time, which amounts shall, to the extent not actually assessed as of the Effective Time, be computed and prorated in accordance with thisSection 1.7;

(B) an amount equal to any and all expenses and expenditures attributable to the Purchased Assets that are being paid by or on behalf of Sellers that are attributable to the periods from and after the Effective Time, as calculated in accordance with GAAP and thisSection 1.7; and

(C) the amount of any proceeds received by Buyer attributable to the Purchased Assets, including, but not limited to, proceeds from the sale of Hydrocarbons, that are attributable to any of the periods prior to the Effective Time, as calculated in accordance with GAAP and thisSection 1.7.

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(ii) The Purchase Price shall be reduced by the sum of the following:

(A) an amount equal to any unpaid ad valorem, property, production, excise, severance and similar taxes and assessments based upon or measured by the ownership of the Purchased Assets paid by or on behalf of Buyer that are attributable to periods of time prior to the Effective Time, which amounts shall, to the extent not actually assessed as of the Effective Time, be computed and prorated in accordance with thisSection 1.7;

(B) an amount equal to any and all expenses attributable to the Purchased Assets that are paid by or on behalf of Buyer that are attributable to any periods prior to the Effective Time, as calculated in accordance with GAAP and thisSection 1.7;

(C) the amount of any proceeds received by Sellers attributable to the Purchased Assets, including but not limited to proceeds from the sale of Hydrocarbons, that are attributable to the periods of time from and after the Effective Time, as calculated in accordance with GAAP and thisSection 1.7;

(D) the value of any Title Defects identified pursuant to and subject to the limitations described inArticle VI;

(E) the value of any Retained Assets as provided inSection 6.14(c);

(F) the aggregate amounts payable to owners of working interests, royalties and overriding royalties and other interests in the Properties held in suspense by Alta, as operator of the Wells, as of the Closing Date, to the extent such amounts held in suspense are not transferred to Buyer at Closing; and

(G) Reduced or increased, as the case may be, by the actual net aggregate Imbalances, if any, owed by Seller to third-parties, as of the Effective Time, multiplied by a price of $4.00 per MMBtu.

(b) The difference of the aggregate amount set forth inSection 1.7(a)(i) minus the aggregate amount set forth inSection 1.7(a)(ii) shall be referred to as the “Purchase Price Adjustment.” If the Purchase Price Adjustment is positive, the Purchase Price shall be increased by the amount of the Purchase Price Adjustment. If the Purchase Price Adjustment is negative, the Purchase Price shall be reduced by the absolute value of the Purchase Price Adjustment.

1.8Termination for Reduction. If net adjustments to the Purchase Price pursuant toArticle VI exceed twenty percent (20%) of the original unadjusted Purchase Price, either Sellers or Buyer may terminate this Agreement by giving written notice to the other Party no later than five (5) days prior to the Closing Date.

1.9Closing Date Adjustment to Purchase Price. At least three (3) but no more than seven (7) days prior to the expected Closing Date, Sellers shall deliver to Buyer a written statement setting forth Sellers’ good faith estimate of the Purchase Price Adjustment based on

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the factors set forth inSection 1.7 (the “Closing Date Estimated Purchase Price Adjustment”). The Purchase Price as adjusted by the Closing Date Estimated Purchase Price Adjustment shall be referred to as the “Closing Date Aggregate Purchase Price.”

1.10Post-Closing Adjustments to Purchase Price.

(a) As promptly as practicable but in no event earlier than sixty (60) days after the Closing Date nor later than ninety (90) days after the Closing Date, Buyer shall deliver to Sellers a statement (the “Initial Post-Closing Purchase Price Adjustment Statement”), setting forth in reasonable detail Buyer’s calculation of the Purchase Price Adjustment. Buyer shall provide Sellers access to all relevant books and records and supporting documentation in connection with Buyer’s preparation of and shall consult with Sellers in preparing the Initial Post-Closing Purchase Price Adjustment Statement.

(b) The Initial Post-Closing Purchase Price Adjustment Statement shall be subject to Sellers’ review. In reviewing the Initial Post-Closing Purchase Price Adjustment Statement, Sellers and their agents and representatives (including, without limitation, accountants and attorneys) shall have the right to communicate with, and to review the work papers, schedules, memoranda and other documents which were prepared by or on behalf of, Buyer in its calculation of the Purchase Price Adjustment. Buyer and its agents and representatives (including, without limitation, accountants and attorneys) shall also have access to all relevant books and records reasonably required for Sellers to complete their review. The Parties shall have thirty (30) days following delivery of the Initial Post-Closing Purchase Price Adjustment Statement to agree as to its accuracy.

(c) To the extent the Parties are able to agree on all or a portion of the Purchase Price Adjustment set forth in the Initial Post-Closing Purchase Price Adjustment Statement, such agreed upon amount shall be referred to as the “Initial Post-Closing Estimated Purchase Price Adjustment Amount.” To the extent the Parties fail to fully agree on the Purchase Price Adjustment as set forth in the Initial Post-Closing Purchase Price Adjustment Statement, any disputes thereon shall be resolved pursuant toSection 1.10(d).

(i) If the Initial Post-Closing Estimated Purchase Price Adjustment Amount is less than the Closing Date Estimated Purchase Price Adjustment, Sellers shall pay Buyer an amount equal to such difference. Each Seller shall be obligated severally, and not jointly, to pay Buyer its pro rata portion of such amount, based upon the ratios set forth onSchedule 1.5.

(ii) If the Initial Post-Closing Estimated Purchase Price Adjustment Amount is greater than the Closing Date Estimated Purchase Price Adjustment, Buyer shall pay Sellers an amount equal to such difference. Such amount shall be allocated amongst the Sellers based upon the ratios set forth onSchedule 1.5.

(iii) The amount payable in accordance withSection 1.10(c)(i) orSection 1.10(c)(ii) above is referred to as the “Initial Post-Closing True-Up Amount.” The Initial Post-Closing True-Up Amount shall be paid by the applicable Party within seven (7) days of the determination of the Initial Post-Closing Estimated Purchase Price Adjustment Amount.

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(d) (i) As promptly as practicable but in no event earlier than one hundred eighty (180) days after the Effective Time nor later than two hundred ten (210) days after the Effective Time, Buyer shall deliver to Sellers a statement (the “Final Post-Closing Purchase Price Adjustment Statement”), setting forth in reasonable detail Buyer’s calculation of the Purchase Price Adjustment. Buyer shall provide Sellers access to all relevant books and records and supporting documentation in connection with Buyer’s preparation of the Final Post-Closing Purchase Price Adjustment Statement and shall consult with Sellers in preparing the Final Post-Closing Purchase Price Adjustment Statement.

(ii) The Final Post-Closing Purchase Price Adjustment Statement shall be subject to Sellers’ review. In reviewing the Final Post-Closing Purchase Price Adjustment Statement, Sellers and their agents and representatives (including, without limitation, accountants and attorneys) shall have the right to communicate with, and to review the work papers, schedules, memoranda and other documents which were prepared by or on behalf of, Buyer in its calculation of the Purchase Price Adjustment. Buyer and its agents and representatives (including, without limitation, accountants and attorneys) shall also have access to all relevant books and records reasonably required for Sellers to complete their review. Within forty-five (45) days of Sellers’ receipt of the Final Post-Closing Purchase Price Adjustment Statement, Sellers shall by written notice advise Buyer of any exceptions (described in reasonable detail) which Sellers may have to the Final Post-Closing Purchase Price Adjustment Statement (“Sellers’ Dispute Notice”).

(iii) For a period of twenty (20) days after Buyer’s receipt of a Sellers’ Dispute Notice, the Parties shall use their commercially reasonable efforts to agree on the Purchase Price Adjustment. If the Parties are able to reach agreement on the Purchase Price Adjustment, such resolution shall be final, binding and conclusive.

(iv) If after such twenty (20) day period, Sellers and Buyer are unable to reach agreement on the Purchase Price Adjustment, the matter shall be referred to an independent national accounting firm mutually acceptable to the Parties (the “Independent Accounting Firm”). The Parties shall cause the Independent Accounting Firm to submit to them a determination of the Purchase Price Adjustment within thirty (30) days after submission of the matter, and such report and determination shall be final, binding and conclusive on Buyer and Sellers. The fees, costs and expenses of the Independent Accounting Firm shall be paid fifty percent (50%) by Sellers and fifty percent (50%) by Buyer.

(v) The Purchase Price Adjustment, as finally determined in accordance with thisSection 1.10(d), shall be referred to as the “Final Post-Closing Purchase Price Adjustment Amount.”

(A) If the Final Post-Closing Purchase Price Adjustment Amount is less than the Initial Post-Closing Estimated Purchase Price Adjustment Amount, Sellers shall pay Buyer an amount equal to such difference. Each Seller shall be obligated, severally and not jointly, to pay Buyer its pro rata portion of such amount based upon the ratios set forth onSchedule 1.5.

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(B) If the Final Post-Closing Purchase Price Adjustment Amount is greater than the Initial Post-Closing Estimated Purchase Price Adjustment Amount, Buyer shall pay Sellers an amount equal to such difference. Such amount shall be allocated amongst the Sellers based upon the ratios set forth onSchedule 1.5.

(C) The amount payable in accordance withSection 1.10(d)(v)(A) or1.10(d)(v)(B) above is referred to as the “Final Post-Closing True-Up Amount.” The Final Post-Closing True-Up Amount shall be paid by the applicable Party within seven (7) days of the final determination of the Final Post-Closing Purchase Price Adjustment Amount.

1.11Additional Proceeds.

(a) If at any time and from time to time, after the last date for which proceeds have been received and reflected in the Final Post-Closing Purchase Price Adjustment Amount, Buyer receives any proceeds attributable to the Purchased Assets that are attributable to any period prior to the Effective Time, as calculated in accordance with GAAP andSection 1.7, Buyer shall promptly pay to Sellers (allocated amongst the Sellers based upon the ratios set forth onSchedule 1.5) all such proceeds.

(b) If at any time and from time to time, after the last date for which proceeds have been received and reflected in the Final Post-Closing Purchase Price Adjustment Amount, any Seller receives any proceeds attributable to the Purchased Assets that are attributable to any period from and after the Effective Time, as calculated in accordance with GAAP andSection 1.7, such Seller shall promptly pay to Buyer all such proceeds.

ARTICLE II

CLOSING

2.1The Closing. The Closing shall take place at the offices of Morgan, Lewis & Bockius LLP, 1000 Louisiana Avenue, Suite 1300, Houston, Texas 77002, commencing at 9:00 a.m. local time on the Closing Date. The “Closing Date” shall be December 21, 2007, or such other date as may be mutually acceptable to the Parties.

2.2Deliveries by Sellers at the Closing. At the Closing, each Seller shall deliver the following:

(a) an Assignment, Bill of Sale and Conveyance in the form ofExhibit F hereto (the “Assignment and Bill of Sale”) duly executed by such Seller;

(b) the Assignment in the form ofExhibit G hereto (the “ORRI Assignment”) duly executed by Alta; and

(c) the various certificates, documents and instruments referred to inSection 7.2.

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2.3Deliveries by Buyer at the Closing. At the Closing, Buyer shall deliver to the Sellers the following:

(a) the Closing Date Aggregate Purchase Price by wire transfer of immediately available funds;

(b) the Assignment and Bill of Sale duly executed by Buyer; and

(c) the other certificates, documents and instruments referred to inSection 7.3.

2.4Proceedings at Closing. All proceedings to be taken and all documents to be executed and delivered at the Closing shall be deemed to have been taken and executed simultaneously, and, except as permitted hereunder, no proceedings shall be deemed taken nor any document executed and delivered until all have been taken, executed and delivered.

ARTICLE III

REPRESENTATIONS AND WARRANTIES OF SELLERS

As an inducement to Buyer to enter into this Agreement and to consummate the transactions contemplated herein, except as set forth on the schedules to thisArticle III, each of the Sellers, severally and not jointly, represents and warrants the following to Buyer, each of which representations and warranties is material to and is relied upon by Buyer. Any disclosure set forth on any particular schedule shall be treated as disclosed with respect to all other sections of thisArticle III regardless of whether or not a specific reference is made thereto, provided it is reasonably apparent from a reading of the disclosure that such disclosure is applicable to such other section. The inclusion of any item or fact in the schedules shall not be deemed an admission that such item or fact is material for the purposes of this Agreement.

3.1Organization and Qualification. Such Seller has been duly organized and is validly existing and in good standing under the laws of the jurisdiction of its organization, formation or incorporation, as applicable, and has the requisite power and authority to enter into this Agreement, to carry on its business as currently being conducted and to own or lease and operate the properties it owns or leases as and in the places now owned, leased or operated, respectively. Such Seller is duly qualified or licensed to do business and is in good standing as a foreign corporation, limited partnership, or limited liability company in each jurisdiction in which the character or location of its assets or properties (whether owned, leased or licensed) or the nature of its business make such qualification necessary, except where the failure to be so qualified or in good standing, individually or in the aggregate, has not had and would not reasonably be expected to have a Seller Material Adverse Effect.

3.2Authority; Binding Effect.

(a) The execution and delivery by such Seller of this Agreement and the consummation by such Seller of the transactions contemplated hereby have been duly and validly authorized by all necessary corporate action on the part of such Seller.

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(b) This Agreement and each agreement, instrument or document being or to be executed and delivered by such Seller in connection with the transactions contemplated hereby or thereby (“Seller Related Documents”), upon due execution and delivery by such Seller, will constitute, assuming the due execution and delivery by the other parties thereto, the legal, valid, and binding obligation of such Seller, enforceable in accordance with its respective terms (except as enforcement may be limited by bankruptcy, insolvency, reorganization, moratorium or similar laws relating to or limiting creditors’ rights generally or by application of equitable principles).

3.3Governmental Entities. Except as set forth onSchedule 3.3 or as otherwise expressly set forth herein, such Seller is not required to submit any material notice, report or other filing with any Governmental Entity in connection with its execution or delivery of this Agreement or any of the Seller Related Documents or the consummation of the transactions contemplated hereby and no consent, approval or authorization of any Governmental Entity is required to be obtained by such Seller in connection with the execution, delivery and performance of this Agreement, except (a) for such filings as may be required under the Hart-Scott-Rodino Act and (b) where such failure to submit such notice, report or other filing or obtain such consent, approval or authorization would not reasonably be expected to have a Seller Material Adverse Effect.

3.4No Conflicts. Except as set forth onSchedule 3.4, the execution, delivery and performance of this Agreement and any of the Seller Related Documents by such Seller does not and will not:

(a) Conflict with or result in any breach of the provisions of, or constitute a default under the organizational documents of such Seller;

(b) (i) Violate any restriction to which such Seller is subject or, with or without the giving of notice, the passage of time, or both, (ii) violate (or give rise to any right of termination, cancellation or acceleration under) any mortgage, deed of trust, license, lease, indenture, contract or other material agreement or instrument, whether oral or written, to which such Seller is a party, or by which it or any of the assets of such Seller is bound (which will not be satisfied, assigned or terminated on or prior to the Closing as a result of the transactions contemplated by this Agreement), (iii) result in the termination of any such instrument or termination of any provisions in such instruments or (iv) result in the creation or imposition of any Security Interest upon the Purchased Assets, in any such case or cases, that would reasonably be expected to have a Seller Material Adverse Effect; or

(c) Constitute a violation of any applicable rule, regulation, law, statute, ordinance, or any judgment, decree, writ, injunction or order of any Governmental Entity, where such violation has not had or would not reasonably be expected to have a Seller Material Adverse Effect.

3.5Contracts; Leases.Schedule 3.5 includes a true and correct list as of the date of this Agreement of all Assigned Contracts. Sellers have made available to Buyer a true and complete copy of each Assigned Contract and Lease. Such Seller is not in material default under the terms of any Assigned Contract or Lease, and there is no material default existing or

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continuing by any other party under the terms of any Assigned Contract or Lease, and each Assigned Contract and Lease is in full force and effect and is valid and enforceable by such Seller in accordance with its terms, assuming the due authorization, execution and delivery thereof by each of the other parties thereto (except as enforcement may be limited by bankruptcy, insolvency, reorganization, moratorium or similar laws relating to or limiting creditors’ rights generally or by application of equitable principles).

3.6Title to Equipment. Such Seller owns all of its interests in the Equipment free and clear of all Liens, except for Permitted Liens.

3.7Oil and Gas Interests.

(a) To Sellers’ Knowledge,Schedule 3.7(a) contains a true, accurate and complete list of the Oil and Gas Interests and the Working Interest and Net Revenue Interests of Seller therein, subject to usual and customary adjustments for integration, and non-consent and other modifications which individually or in the aggregate would not reasonably be expected to have a Seller Material Adverse Effect.

(b) The Oil and Gas Documents to which such Seller is a party are in full force and effect in all material respects and to such Seller’s Knowledge, constitute valid and binding obligations of the parties thereto. To the Knowledge of such Seller, such Seller is not in breach or default (and no situation exists which with the passing of time or giving or notice would create a breach or default) of its obligations under the Oil and Gas Documents to which such Seller is a party in any material respect. To the Knowledge of such Seller, all payments (including all delay rentals, royalties, shut-in royalties and valid calls for payment or prepayment under operating agreements) owing by such Seller under the Oil and Gas Documents to which such Seller is a party have been and are being made (timely, and before the same became delinquent) by such Seller in all material respects.

(c) Such Seller is not obligated, by virtue of a prepayment arrangement, a “take or pay” arrangement, production payment or any other arrangement, to deliver oil, gas or other Hydrocarbons produced from the Oil and Gas Interests at some future time without then receiving full payment therefor.

(d) As to claims arising by, through or under such Seller, such Seller has Defensible Title to the Leases, except for:

(i) liens, if any, reflected onSchedule 3.7(d) as securing specified liabilities; and

(ii) easements, covenants and restrictions and other exceptions to title shown of record in the offices of the county clerks in which the properties, assets and leasehold estates are located.

3.8No Litigation. Except as set forth onSchedule 3.8, there are no actions, suits, dispute resolution proceedings, claims, governmental investigations or other legal or administrative proceedings, or any orders decrees or judgments in progress, pending or in effect, or, to the Knowledge of such Seller, threatened against or relating to such Seller or relating to

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any of the Purchased Assets, or against or relating to the transactions contemplated by this Agreement, and there are none pending in state courts, or in any federal courts, or, to the Knowledge of such Seller, pending in other jurisdictions or threatened in writing, at law or in equity, by or before any federal, state or municipal court or other governmental agency, department, commission, board, bureau, instrumentality or other Governmental Entity.

3.9Brokers’ Fees. Except as set forth onSchedule 3.9, such Seller has no liability or obligation to pay any fees or commissions to any broker, finder or agent with respect to the transactions contemplated by this Agreement. Buyer shall not directly or indirectly have any responsibility, liability or expense, as a result of undertakings or agreements of Sellers or their Affiliates, for brokerage fees, finder’s fees, agent’s commissions or other similar forms of compensation in connection with this Agreement or any agreement or transaction contemplated hereby.

3.10Books and Records. The books and records of such Seller, which constitute a portion of the Purchased Assets, are complete and correct in all material respects and have been maintained in accordance with sound business practices.

3.11Disclaimer. Except as expressly set forth in this Agreement or the Seller Related Documents, such Seller makes no representation or warranty, express or implied, at law or in equity, in respect of such Seller or any of its assets, liabilities or operations, including, without limitation, the Purchased Assets and the Assumed Liabilities, and any such other representations or warranties are hereby expressly disclaimed.

3.12Preference Rights and Transfer Requirements.Schedule 3.12 sets forth all Preference Rights and Transfer Requirements applicable to the Purchased Assets, including Preference Rights and Transfer Requirements contained in easements, rights-of-way or equipment leases included in the Purchased Assets. None of the other Purchased Assets, or any portion thereof, is subject to any Preference Right or Transfer Requirement which may be applicable to the transactions contemplated by this Agreement, except for Preference Rights and Transfer Requirements as are set forth onSchedule 3.12.

3.13Taxes and Assessments.

(a) With respect to all Taxes related to the Purchased Assets, (i) all Tax Returns relating to the Assets required to be filed by Sellers with respect to such Taxes have been timely filed with the appropriate Governmental Entity in all jurisdictions in which such Tax Returns are required to be filed; and (ii) such Tax Returns are true and correct in all material respects, and (iii) all Taxes due with respect to such Tax Returns have been paid, except those being contested in good faith.

(b) With respect to all Taxes related to the Purchased Assets, except as set forth onSchedule 3.13, (i) there are not currently in effect any extensions or waivers of any statute of limitations of any jurisdiction regarding the assessment or collection of any such Tax; (ii) there are no Proceedings against the Purchased Assets or Sellers by any Governmental Entity; and (iii) there are no Tax liens on any of the Purchased Assets except for liens for Taxes not yet due.

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3.14Condemnation. There is no actual, or, to Sellers’ Knowledge, no threatened taking (whether permanent, temporary, whole or partial) of any part of the Purchased Assets by reason of condemnation or the threat of condemnation.

3.15Bankruptcy. There are no bankruptcy, reorganization, or receivership proceedings pending against, or, to Sellers’ Knowledge, being contemplated by or threatened against Sellers.

3.16Production Allowables. Seller has not received written notice that there has been any change proposed in the production allowables for any Wells listed onExhibit B.

3.17Foreign Person. No Seller is a “foreign person” within the meaning of Section 1445 of the Code.

3.18Collective Bargaining Agreements. Neither Sellers or any of their Affiliates have agreed to recognize any labor union or other collective bargaining representative of, nor has any labor union or other collective bargaining representative been certified as the exclusive bargaining representative of, any individual employed or otherwise engaged by Sellers (or an Affiliate thereof) who is primarily involved in the business associated with the Purchased Assets.

3.19Compliance with Laws. To Sellers’ Knowledge, except as disclosed onSchedule 3.19, the Purchased Assets are, and the ownership, operation, development, maintenance, and use of any of the Purchased Assets are, in material compliance with the provisions and requirements of all laws of all Governmental Entities having jurisdiction with respect to the Purchased Assets, or the ownership, operation, development, maintenance, or use of any of the Purchased Assets, except where the failure to so comply would not have a Seller Material Adverse Effect.

3.20Outstanding Capital Commitments. Except as disclosed onSchedule 3.20, there are no outstanding drilling and completion AFEs or other commitments to make capital expenditures which are binding on the Purchased Assets and which Sellers reasonably anticipate will individually require expenditures by the owner of the Purchased Assets after the Effective Time in excess of $50,000 for the period from October 1, 2007 through and including November 23, 2007.

ARTICLE IV

REPRESENTATIONS AND WARRANTIES OF BUYER

As an inducement to Sellers to enter into this Agreement and to consummate the transactions contemplated herein, except as set forth on the schedules to thisArticle IV, Buyer represents and warrants the following to Sellers, each of which representations and warranties is material to and is relied upon by Sellers. Any disclosure set forth on any particular schedule shall be treated as disclosed with respect to all other sections of thisArticle IV regardless of whether or not a specific reference is made thereto, provided it is reasonably apparent from a reading of the disclosure that such disclosure is applicable to such other section. The inclusion of any item or fact in the schedules shall not be deemed an admission that such item or fact is material for the purposes of this Agreement.

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4.1Organization and Qualification. Buyer is a Delaware corporation duly organized, validly existing and in good standing under the laws of the jurisdiction of its organization, formation or incorporation, as applicable, with full corporate power and authority to carry on its business as currently being conducted and to own or lease and operate the properties it owns or leases as and in the places now owned, leased or operated, respectively. Buyer is not in default under or in violation of any provision of its Certificate of Incorporation or Bylaws. Buyer is duly qualified or licensed to do business and is in good standing as a foreign corporation in each jurisdiction in which the character or location of its assets or properties (whether owned, leased or licensed) or the nature of its business make such qualification necessary, except where the failure to be so qualified or in good standing, individually or in the aggregate, has not had and would not reasonably be expected to have a Buyer Material Adverse Effect.

4.2Authority; Binding Effect.

(a) The execution and delivery by Buyer of this Agreement and the consummation by Buyer of the transactions contemplated hereby have been duly and validly authorized by all necessary corporate action on the part of Buyer.

(b) This Agreement and each agreement, instrument or document being or to be executed and delivered by Buyer in connection with the transactions contemplated thereby (“Buyer Related Documents”), upon due execution and delivery by Buyer, will constitute, assuming the due execution and delivery by the other parties thereto, the legal, valid, and binding obligation of Buyer, enforceable in accordance with its respective terms (except as enforcement may be limited by bankruptcy, insolvency, reorganization, moratorium or similar laws relating to or limiting creditors’ rights generally or by application of equitable principles).

4.3Governmental Entities. Except as set forth onSchedule 4.3 or as otherwise expressly set forth herein, Buyer is not required to submit any material notice, report or other filing with any Governmental Entity in connection with its execution or delivery of this Agreement or any of Buyer Related Documents or the consummation of the transactions contemplated hereby and no consent, approval or authorization of any Governmental Entity is required to be obtained by Buyer in connection with the execution, delivery and performance of this Agreement, except (a) for such filings as may be required under the Hart-Scott-Rodino Act and (b) where such failure to submit such notice, report or other filing or obtain such consent, approval or authorization would not reasonably be expected to have a Buyer Material Adverse Effect.

4.4No Conflicts. Except as set forth onSchedule 4.4, the execution, delivery and performance of this Agreement and any of Buyer Related Documents by Buyer does not and will not:

(a) Conflict with or result in any breach of the provisions of, or constitute a default under the organizational documents of Buyer;

(b) (i) Violate any restriction to which Buyer is subject or, with or without the giving of notice, the passage of time, or both, (ii) violate (or give rise to any right of termination, cancellation or acceleration under) any mortgage, deed of trust, license, lease, indenture, contract

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or other material agreement or instrument, whether oral or written, to which Buyer is a party, or by which it or any of the assets of Buyer are bound (which will not be satisfied, assigned or terminated on or prior to the Closing as a result of the transactions contemplated by this Agreement), (iii) result in the termination of any such instrument or termination of any provisions in such instruments or (iv) result in the creation or imposition of any Security Interest upon the properties or assets of Buyer, in any such case or cases, that will have a Buyer Material Adverse Effect; or

(c) Constitute a violation of any applicable rule, regulation, law, statute, ordinance, or any judgment, decree, writ, injunction or order of any Governmental Entity, where such violation has not had or would not reasonably be expected to have a Buyer Material Adverse Effect.

4.5No Litigation. There are no actions, suits, dispute resolution proceedings, claims, governmental investigations or other legal or administrative proceedings, or any orders decrees or judgments in progress, pending or in effect, or, to the Knowledge of Buyer, threatened against or relating to Buyer which are reasonably likely to impair Buyer’s ability to perform its obligations under this Agreement.

4.6Brokers’ Fees. Except as set forth onSchedule 4.6, Buyer has no liability or obligation to pay any fees or commissions to any broker, finder or agent with respect to the transactions contemplated by this Agreement. Sellers shall not directly or indirectly have any responsibility, liability or expense, as a result of undertakings or agreements of Buyer or its Affiliates, for brokerage fees, finder’s fees, agent’s commissions or other similar forms of compensation in connection with this Agreement or any agreement or transaction contemplated hereby.

4.7Disclaimer. Except as expressly set forth in this Agreement or Buyer Related Documents, Buyer makes no representations or warranties, express or implied, at law or in equity, in respect of Buyer or any of its assets, liabilities or operations, including, without limitation, with respect to merchantability or fitness for any particular purpose, and any such other representations or warranties are hereby expressly disclaimed.

ARTICLE V

COVENANTS

5.1Closing Efforts. Each of the Parties shall use its Reasonable Best Efforts to take all actions and to do all things necessary, proper or advisable to consummate the transactions contemplated by this Agreement, including using its Reasonable Best Efforts to ensure that (a) its representations and warranties are true and correct in all material respects at the Closing Date and (b) the conditions to the obligations of the other Parties to consummate the Closing are satisfied on or before the date that is forty-five (45) days after the date hereof.

5.2Governmental and Third-Party Notices and Consents.

(a) Each Party shall use its Reasonable Best Efforts to obtain, at its expense, all waivers, permits, consents, approvals or other authorizations from Governmental Entities and to effect all registrations, filings and notices with or to Governmental Entities, as may be

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required for such Party to consummate the transactions contemplated by this Agreement and to otherwise comply with all applicable laws and regulations in connection with the consummation of the transactions contemplated by this Agreement. Without limiting the generality of the foregoing, each of the Parties shall promptly file any Notification and Report Forms and related material that it may be required to file with the Federal Trade Commission and the Antitrust Division of the United States Department of Justice under the Hart-Scott-Rodino Act, shall use its Reasonable Best Efforts to obtain an early termination of the applicable waiting period, and shall make any further filings or information submissions pursuant thereto that may be necessary, proper or advisable; provided that in no event shall Buyer or any of its Affiliates be required to agree or commit to divest, hold separate, offer for sale, abandon, limit its operation of or take similar action with respect to any assets (tangible or intangible) or any business interest of it or any of its Affiliates in connection with or as a condition to receiving the consent or approval of any Governmental Entity (including, without limitation, under the Hart-Scott-Rodino Act).

(b) Each Seller shall use its Reasonable Best Efforts (without the obligation to expend money except reasonable out-of-pocket costs) to obtain, at its expense, all such waivers, consents or approvals from third parties, and to give all such notices to third parties, as are required to be listed on the schedules hereto or as may be required for such Seller to consummate the transactions contemplated by this Agreement and to otherwise comply with all applicable laws and regulations in connection with the consummation of the transactions contemplated by this Agreement, including, without limitation, any waivers, consents or approvals from third parties arising or delivered after the Closing.

5.3Operation of Businesses of Sellers.

(a) Except as contemplated by this Agreement, during the period from the date of this Agreement to the earlier of the Closing or the termination of this Agreement, each Seller shall conduct its operations of the Purchased Assets in the ordinary course of business, consistent with past practice, and in compliance in all material respects with all applicable laws and regulations. Without limiting the generality of the foregoing, except as set forth onSchedule 5.3, during this period, no Seller shall, without the written consent of Buyer, which consent shall not be unreasonably withheld or delayed:

(i) abandon any part of the Purchased Assets;

(ii) approve any operations relating to the Purchased Assets anticipated in any instance to cost the owner of the Purchased Assets more than $150,000 per authority for expenditure net to Sellers’ interest (except emergency operations, operations in the ordinary course of business which include, without limitation, participation in any and all integrations submitted to the Arkansas Oil and Gas Commission, all operations proposed under presently existing contractual obligations including, but not limited to, all joint operating agreements, ongoing commitments and operations undertaken to avoid a monetary penalty or forfeiture provision of any applicable agreement or order);

(iii) convey or dispose of any of the Purchased Assets or any interest therein (other than replacement of equipment or sale of oil, gas and other liquid products produced from the Purchased Assets in the ordinary and regular course of business) or enter into any farmout, farmin or other similar contract affecting the Purchased Assets if the net expense to Sellers’ interest will be in excess of $50,000;

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(iv) let lapse any insurance now in force with respect to the Purchased Assets;

(v) encumber or mortgage the Purchased Assets or allow any lien or other encumbrance to become a burden on the Purchased Assets; or

(vi) materially modify or terminate any of the operating agreements or other significant Assigned Contract or Lease.

If Buyer fails to respond within five (5) business days following delivery by a Seller of a written request for approval or consent with respect to any such proposed action or expenditure, then Buyer shall be deemed to have agreed with such Seller’s election or other determination with respect thereto. Buyer shall not unreasonably withhold its approval or consent with respect to any such proposed action or expenditure.

(b) Nothing contained in this Agreement shall give to Buyer, directly or indirectly, rights to control or direct the operations of Sellers prior to the Closing Date. Prior to the Closing Date, Sellers shall exercise, consistent with the terms and conditions of this Agreement, complete control and supervision of their operations.

(c) Between the date of this Agreement and the Closing Date, Sellers shall deliver to an officer designated by Buyer copies of all production reports and daily drilling reports relating to Sellers’ operation of the Purchased Assets promptly after the preparation thereof in the ordinary course of business.

5.4Expenses. Except as otherwise provided in this Agreement, each of the Parties shall bear its own costs and expenses (including legal and accounting fees and expenses) incurred in connection with this Agreement and the transactions contemplated hereby.

5.5Notification. Sellers, on one hand, and Buyer, on the other, shall notify the other Party in writing of the existence or happening of any fact, event or occurrence which should be included on the schedules toArticle III orArticle IV, as applicable, in order to make the representations and warranties set forth inArticle III orArticle IV, as applicable, true and correct in all material respects as of the Closing Date, it being understood and agreed that the delivery of such information shall not in any manner constitute a waiver by Buyer or Sellers, as applicable, of any of the conditions precedent to the Closing hereunder; provided, however, that in determining whether there is a breach of any representation or warranty contained inArticle III orArticle IV, as applicable, for purposes of the indemnification to be provided by Indemnifying Party pursuant toArticle VIII, such representation or warranty shall be qualified by any information provided pursuant to thisSection 5.5.

5.6Access to Information. Subject to the terms of the Confidentiality Agreement by and between Buyer and Alta on its own behalf and on behalf of the other Sellers, dated October 11, 2007 (the “Confidentiality Agreement”), each of the Sellers shall afford to the Buyer’s officers, directors, employees, accountants, counsel and other agents reasonable access

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during normal business hours to its employees, properties, assets and records, during the period prior to the Closing Date, to obtain all information concerning its business as such Buyer may reasonably request. Each of the Sellers shall furnish to the Buyer all such documents and copies of documents and records and information with respect to itself and copies of any working papers relating thereto as the Buyer may reasonably request, including, without limitation, information relating to title or otherwise pertaining to the Purchased Assets. Nothing in thisSection 5.6 shall require Buyer or Sellers, as the case may be, to provide any access, or to disclose any information, if permitting such access or disclosing such information would (i) violate applicable law, (ii) violate any of its obligations with respect to confidentiality (provided that each Party shall, upon the request of the other Party, use its Reasonable Best Efforts to obtain the required consent of any third party to such access or disclosure), or (iii) result in the loss of attorney-client privilege (provided that each Party shall use its Reasonable Best Efforts to allow for such access or disclosure in a manner that does not result in a loss of attorney-client privilege). Buyer and Sellers also will consult with the other Party regarding their business on a regular basis.

5.7Bulk Sales Laws. Buyer acknowledges that Sellers will not comply with the provisions of any bulk sales laws in any jurisdiction in connection with the transactions contemplated by this Agreement.

5.8Access to Purchased Assets, Books and Records.

(a) From the date of this Agreement until the Closing, Seller shall cooperate with Buyer and provide Buyer and its representatives, consultants, and current and prospective lenders and advisors, and each of their authorized representatives reasonable access to the Purchased Assets and reasonable access to all records related to the Purchased Assets, but only to the extent that Seller may do so without violating any obligations to any third party and to the extent that Seller has authority to grant such access without breaching any restriction legally binding on Seller. Buyer shall conduct all such inspections and other information gathering described above only (i) (x) during regular business hours and (y) during any weekends and after hours requested by Buyer that can be reasonably accommodated by Seller, and (ii) in a manner which will not unduly interfere with Seller’s operation of the Purchased Assets.

(b) From the date of this Agreement until the Closing, Sellers shall afford to Buyer and its officers, employees, agents and current and prospective lenders and each of their authorized representatives reasonable access to the Assets, including all related records in accordance withSection 5.8(a). During such period, Sellers shall also make available to Buyer, upon reasonable notice during normal business hours, Sellers’ personnel knowledgeable with respect to the Purchased Assets in order that Buyer may make such diligent investigation as Buyer considers desirable. For those Purchased Assets that are not operated by Sellers, Seller shall use commercially reasonable efforts to obtain permission from the operator for Buyer to conduct such inspections but, provided Seller has exercised such commercially reasonable efforts, Seller shall have no liability to Buyer for failure to obtain any such operator’s permission. Upon reasonable notice to Seller, Buyer shall have the right to conduct an environmental assessment of all or any portion of the Purchased Assets (the “Assessment”), to be conducted by a reputable environmental consulting or engineering firm approved in advance in writing by Seller (such approval not to be unreasonably withheld), but only to the extent that

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Seller may grant such right without violating any obligations to any third party (provided that Seller shall use its commercially reasonable efforts to obtain any necessary third party consents to any Assessment to be conducted by Buyer). The Assessment shall be conducted at the sole cost and expense of Buyer. After completing any Assessment of the Purchased Assets, Buyer shall, at its sole cost and expense, restore the Purchased Assets to their condition prior to the commencement of such Assessment, unless Seller requests otherwise, and shall promptly dispose of all drill cuttings, corings, or other investigative-derived wastes generated in the course of the Assessment. Upon Seller’s written request, Buyer shall provide Seller with a copy of the final version of all environmental reports prepared by, or on behalf of, Buyer with respect to any Assessment conducted on the Purchased Assets. In the event that any necessary disclosures under applicable laws are required with respect to matters discovered by any Assessment conducted by, for or on behalf of Buyer, Buyer agrees that Seller shall be the responsible party for disclosing such matters to the appropriate Governmental Entities; provided that, if Seller fails to promptly make such disclosure and Buyer or any of its Affiliates is legally obligated to make such disclosure, Buyer or any of its Affiliates, as applicable, shall have the right to fully comply with such legal obligation. If, within five (5) days after the date hereof, as a result of its investigation pursuant to thisSection 5.8(b), Buyer determines that with respect to the Purchased Assets, there exists a violation of any Environmental Law, the Parties agree to negotiate in good faith a resolution satisfactory to all Parties.

(c) Sellers and Buyer shall preserve until the fifth (5th) anniversary of the Closing Date all records possessed or to be possessed by such Party relating to any of the Purchased Assets prior to the Closing Date. After the Closing Date, where there is a legitimate purpose, such Party shall provide the other Party with access, upon prior reasonable written request specifying the need therefor, during regular business hours, to (a) the officers and employees of such Party and (b) the books of account and records of such Party, but, in each case, only to the extent relating to the Purchased Assets prior to the Closing Date, and the other Party and its representatives shall have the right to make copies of such books and records; provided, however, that the foregoing right of access shall not be exercisable in such a manner as to interfere unreasonably with the normal operations and business of such Party. Such records may nevertheless be destroyed by a Party if such Party sends to the other Party written notice of its intent to destroy records, specifying with particularity the contents of the records to be destroyed. Such records may then be destroyed after the thirtieth (30th) day after such notice is given unless another Party objects to the destruction in which case the Party seeking to destroy the records shall deliver such records to the objecting Party.

5.9Further Assurances. Upon the terms and subject to the conditions hereof, the Parties hereto shall execute such documents and other instruments and take such further actions as may be reasonably required to carry out the provisions hereof and consummate the transactions contemplated by this Agreement.

5.10Delivery of Books and Records to Buyer. Sellers shall, within thirty (30) days after Closing, deliver such books, records and other materials referenced inSection 1.1(f) to Buyer.

5.11Tax Matters. If requested by Buyer, Sellers will assist Buyer with preparation of all ad valorem and property Tax Returns for periods ending on or before December 31, 2007

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(including any extensions requested). Sellers shall deliver to Buyer within thirty (30) days of filing copies of all Tax Returns to be filed by Seller relating to the Assets and any supporting documentation to be provided by Sellers to Governmental Entities for Buyer’s approval, which shall not be unreasonably withheld, excluding Tax Returns related to income tax, franchise tax, or other similar Taxes. Buyer shall file all Tax Returns covering Taxes that are required to be filed after the Closing Date unless covered above. With respect to such Tax Returns covering a taxable period which includes the Effective Date, Buyer shall provide a copy of such Tax Return to Sellers within thirty (30) days of filing for Sellers’ approval, which shall not be unreasonably withheld. Buyer and Sellers shall cooperate fully, as and to the extent reasonably requested by the other Party, in connection with the filing of any Tax Returns and any audit, litigation or other proceeding with respect to Taxes. Such cooperation shall include the retention and (upon the other Party’s request) the provision of records and information which are reasonably relevant to any such audit, litigation or other proceeding and making employees reasonably available on a mutually convenient basis to provide additional information and explanation of any material provided hereunder. Each of Buyer and Sellers agrees (i) to retain all books and records with respect to Tax matters pertinent to the acquired assets relating to any taxable period beginning before the Closing Date until the expiration of the statute of limitations (and, to the extent notified by Buyer or Sellers, any extensions thereof) of the respective taxable periods, and to abide by all record retention agreements entered into with any Governmental Entity, and (ii) to give the other Party reasonable written notice prior to transferring, destroying or discarding any such books and records and, if the other Party so requests, each Party shall allow the other Party the option of taking possession of such books and records prior to their disposal. Buyer and Sellers further agree, upon request, to use their commercially reasonable efforts to obtain any certificate or other document from any Governmental Entity or any other Person as may be necessary to mitigate, reduce or eliminate any Tax that could be imposed with respect to the transactions contemplated.

5.12Letters in Lieu; Assignments; Operatorship.

(a) Sellers will execute on the Closing Date letters in lieu of division and transfer orders relating to the Purchased Assets, on forms prepared by Sellers and reasonably satisfactory to Buyer, to reflect the transaction contemplated hereby.

(b) Sellers will prepare and execute, and Buyer will execute, on the Closing Date, all assignments necessary to convey to Buyer all federal and state Leases, if any, in the form as prescribed by the applicable Governmental Entity and otherwise acceptable to Buyer and Sellers.

(c) Sellers make no representations or warranties to Buyer as to transferability or assignability of operatorship of any Purchased Assets. Seller is not aware of any effort by any third party to have Alta removed as operator of any property for which it is currently operator. Rights and obligations associated with operatorship of such Purchased Assets are governed by operating and similar agreements covering the Purchased Assets and will be determined in accordance with the terms of such agreements. However, Sellers will assist Buyer in Buyer’s efforts to succeed Alta as operator of any Wells and units included in the Purchased Assets where Alta currently serves as operator. Buyer shall, promptly following Closing, file all appropriate forms and declarations or bonds with federal and state agencies relative to its

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assumption of operatorship. For all Alta operated Purchased Assets, Sellers shall execute and deliver to Buyer on the Closing Date, and Buyer shall promptly file the appropriate forms with the applicable regulatory agency transferring operatorship of such Assets to Buyer.

ARTICLE VI

TITLE MATTERS

6.1Title Information. Sellers shall make all information in Sellers’ or their agents’ possession regarding title to the Purchased Assets available to Buyer in Sellers’ offices at reasonable times during Sellers’ normal business hours.

6.2Defensible Title. “Defensible Title” means the title of Sellers in and to each Lease and Well that, subject to and except for the Permitted Encumbrances:

(a) entitles Sellers to receive not less than the Net Revenue Interests for the hydrocarbons and proceeds thereof produced in respect of each Lease as set forth onSchedule 3.7(a),

(b) obligates Sellers to bear costs and expenses relating to the maintenance, development, operation and production of hydrocarbons in respect of each Lease, in an amount not greater than the Working Interest in respect of each Lease as set forth onSchedule 3.7(a), except to the extent modified by integration or non-consent adjustments in the ordinary course of business, and

(c) is free and clear of encumbrances, liens and defects that impair the use and enjoyment of or that constitute a loss of interest in such Lease.

6.3Defensible Title; Development Acreage. For purposes of the Title Defect Notice set forth inSection 6.8 only, Sellers’ title to any non-producing acreage (“Development Acreage”) included in the Leases shall be presumed to be Defensible Title unless Buyer can show through actual evidence submitted with a Title Defect Notice that Sellers’ title to such Development Acreage has failed or that the Development Acreage is subject to a lien or encumbrance (except for Permitted Encumbrances).

6.4Allocated Value. If an Allocated Value has not been given for a Lease or if the Allocated Value for any Lease is zero, Sellers shall be conclusively presumed to have Defensible Title to such Lease.

6.5Permitted Encumbrances. “Permitted Encumbrances” shall include the following (but only to the extent they exist and constitute a burden on the Purchased Assets as of the Effective Time):

(a) any royalties, overriding royalties, net profits interests, production payments, reversionary interests and similar burdens if the net cumulative effect of such burdens does not reduce the Net Revenue Interests in respect of a Lease;

(b) liens for taxes or assessments not yet delinquent, or, if delinquent, being contested in good faith;

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(c) rights to consent by, notices to, filings with or actions by federal, state, local or tribal authorities in connection with the conveyance of the Purchased Assets if customarily obtained after a conveyance is made;

(d) obligations to reassign upon the surrender or expiration of any Lease;

(e) easements, rights of way, servitudes, permits, surface leases and other rights with respect to the surface or any restrictions on access to the surface or subsurface that do not materially interfere with the operation of the Purchased Asset;

(f) Title Defects waived by Buyer;

(g) division orders, transfer orders, letters in lieu of transfer orders and pooling or unitization orders, declarations or agreements;

(h) materialmen’s, mechanics’, repairmen’s, contractors’, or other similar liens or charges (i) if the amount owed is not yet due and payable, (ii) if such lien or charge has not been filed pursuant to law and the time for filing has expired, (iii) if filed, such lien or charge has not yet become due and payable or payment is being withheld as provided by law, or (iv) if the validity of such lien or charge is being contested in good faith;

(i) rights reserved to or vested in any governmental authority to control or regulate any of the Purchased Assets in any manner and all applicable laws, rules, regulations and orders of general applicability in the area;

(j) liens arising under operating agreements, unitization and pooling agreements and production sales contracts securing amounts not yet due and payable or, if due, being contested in good faith;

(k) calls on or preferential rights to purchase production held by third parties to purchase production for a price at or above market price;

(l) Preference Rights disclosed onSchedule 3.12; and

(m) Transfer Requirements disclosed onSchedule 3.12;

6.6Title Defect. “Title Defect” means any material encumbrance, defect in or objection to real property title, excluding Permitted Encumbrances, that renders Sellers’ title less than Defensible Title. Notwithstanding the foregoing, the following shall not constitute Title Defects:

(a) defects based on lack of information in Sellers’ files;

(b) defects in the chain of title consisting of the failure to recite marital status or omissions of successors or heirship proceedings, unless Buyer provides affirmative evidence that such failure or omission has resulted in a third party’s actual and superior claim of title to the Asset, which claim, if asserted, is likely to prevail;

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(c) defects arising out of the lack of a survey;

(d) defects based on the failure to record leases issued by the United States or any state, local or tribal authority or any assignments of record title or operating rights in the real property or other county records;

(e) defects asserting a change in Net Revenue Interests or Working Interests based on an after-payout decrease in Net Revenue Interests or increase in Working Interests pursuant to a farm-in, farm-out or other agreement that is listed onSchedule 6.6, if the effect of such change is reflected in the Net Revenue Interests and Working Interests set forth inSchedule 3.7(a);

(f) defects related to suspension of revenues due and owing to Sellers, if such suspension is not supported by facts and circumstances that would otherwise be a Title Defect; and

(g) defects that have been cured or that are not material in light of the entire chain of title or subsequent agreements.

6.7Title Defect Value. “Title Defect Value” means the value of the Title Defect as determined by Buyer in good faith, taking into account all relevant factors, including but not limited to the following:

(a) the Allocated Value of the Lease;

(b) the reduction in the Net Revenue Interests in respect of the Lease, or the increase in the Working Interests in respect of the Lease to the extent such increase is not accompanied by a corresponding increase in the Net Revenue Interests;

(c) if the Title Defect represents only a possibility of title failure, the probability that such failure will occur;

(d) the legal and practical effect of the Title Defect; and

(e) if the Title Defect is a lien or encumbrance other than a Permitted Encumbrance, the cost of removing the lien or encumbrance.

Only that portion of the Lease that is materially and adversely affected by a Title Defect shall be considered for purposes of determining the Title Defect Value.

6.8Title Defect Notice. Buyer shall give Sellers notice (“Title Defect Notice”) as soon as possible but no later than December 17, 2007 (such date being referred to herein as the “Objection Date”). The Title Defect Notice must include all of the following:

(a) a description of the Title Defect;

(b) a description of the reasonable basis for the Title Defect;

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(c) Reasonable Documentation supporting the basis for the Title Defect;

(d) evidence supporting Buyer’s belief that the Title Defect has not been released or cured and is still enforceable; and

(e) the identity and the Allocated Value of the Lease.

6.9Assumed Title Liabilities. Any notice that is not timely and properly given or that does not satisfy all of the foregoing shall not be a valid Title Defect Notice, and any Title Defects not included in a valid Title Defect Notice shall be deemed to be “Assumed Title Liabilities” and to have been waived or assumed by Buyer. Notwithstanding anything to the contrary contained in this Agreement, except as to any Title Defects subject toSection 6.11(b) orSection 6.13(b), after Closing, Sellers’ only warranty of title to the Purchased Assets shall be that, as to claims arising by, through or under Sellers, Sellers have Defensible Title to the Oil and Gas Interests.

6.10Reasonable Documentation. “Reasonable Documentation” means a copy of any available title opinion or other explanations describing the Title Defect and

(a) a copy of the relevant document, if the basis is a document;

(b) the deed preceding and following a gap in the chain of title or a title opinion describing the gap in reasonable detail, if the basis is a gap in Sellers’ chain of title;

(c) a copy of the document creating the lien or encumbrance, if the basis is a lien or encumbrance, together with evidence supporting Buyer’s determination that the lien or encumbrance has not been released and is still enforceable; or

(d) any other reasonable documentation or explanation supporting the Title Defect.

6.11Sellers’ Options. Sellers shall have the right to cure any Title Defect but shall have no obligation to do so. If Buyer gives a Title Defect Notice, Sellers shall have the option of:

(a) curing the Title Defect before Closing, and, if such Title Defect is not cured before Closing, Seller shall further elect (b), (c) or (d);

(b) indemnifying Buyer for all liabilities and obligations associated with the Title Defect, which indemnity shall terminate if Seller later cures the Title Defect;

(c) reducing the Purchase Price by the Title Defect Value, subject to the Title Defect Threshold and Title Defect Deductible described inSection 6.12, in which event Sellers shall be released from and of all further liability or obligation to Buyer with respect to the Title Defect, and the Title Defect shall be a Permitted Encumbrance; or

(d) if the Title Defect Value exceeds twenty percent (20%) of the Allocated Value of the Well, excluding the Well from the Purchased Assets conveyed to Buyer at the Closing, subject toSection 6.13, in which event the Purchase Price shall be reduced by the Allocated Value of the Well.

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6.12Adjustment to Purchase Price; Threshold and Deductible. At Closing, the Purchase Price may be adjusted for Title Defect Values as set forth inSection 6.11(c); provided, however, notwithstanding anything to the contrary herein, there shall be no cure, remedy, deletion or adjustment to the Purchase Price whatsoever in respect of any Title Defects unless the aggregate value of all Title Defects equals or exceeds one percent (1%) of the Purchase Price (the “Title Defect Threshold Amount”). Once the Title Defect Threshold Amount has been reached, the amount of reduction in Purchase Price shall be the amount of Title Defect Values.

6.13Exclusions of Wells. Pursuant toSection 6.11(d), if the Title Defect Value exceeds twenty percent (20%) of the Allocated Value of the Well, Sellers shall have the option to exclude the Well from the Purchased Assets conveyed to Buyer at the Closing by notifying Buyer on or before the Closing, in which event the Purchase Price shall be reduced by the Allocated Value of the Well. If the Title Defect Value exceeds twenty percent (20%) of the Allocated Value of the Well and the Well is excluded from the Purchased Assets conveyed to Buyer at the Closing, Sellers may elect any one or more of the following:

(a) if Sellers cure the Title Defect to Buyer’s reasonable satisfaction before the date that is one hundred eighty (180) days after the Effective Time, Seller may convey the Well affected by the Title Defect to Buyer on the date that is one hundred eighty (180) days after the Effective Time, subject to all of the terms and conditions of this Agreement, and Buyer shall pay to Seller the amount by which the Purchase Price was reduced with respect to the Well; or

(b) if Sellers do not cure the Title Defect to Buyer’s reasonable satisfaction before the date that is one hundred eighty (180) days after the Effective Time and agree to indemnify Buyer from all liabilities and obligations arising out of the Title Defect, Sellers may convey the Well affected by the Title Defect to Buyer on the date that is one hundred eighty (180) days after the Effective Time, subject to all of the terms and conditions of this Agreement, in which event Buyer shall pay to Sellers the amount by which the Purchase Price was reduced with respect to the Well, and Sellers shall be released from all further liability or obligation to Buyer with respect to the Title Defect, and, subject to the indemnity provided above in this paragraph, the Title Defect shall be a Permitted Encumbrance.

6.14Preference Rights and Transfer Requirements.

(a) The transactions contemplated by this Agreement are expressly subject to all validly existing and applicable Preference Rights and Transfer Requirements. Prior to the Closing Date, Sellers shall initiate all procedures which are reasonably required to comply with or obtain the waiver of all Preference Rights and Transfer Requirements set forth inSchedule 3.12 with respect to the transactions contemplated by this Agreement. Sellers shall use their commercially reasonable efforts to obtain all applicable consents and to obtain waivers of applicable Preference Rights; provided, however, Sellers shall not be obligated to pay any consideration to (or incur any cost or expense for the benefit of) the holder of any Preference Right or Transfer Requirement in order to obtain the waiver thereof or compliance therewith.

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(b) If the holder of a Preference Right elects prior to Closing to purchase the Purchased Asset subject to a Preference Right (a “Preference Property”) in accordance with the terms of such Preference Right, and Seller receives written notice of such election prior to the Closing, such Preference Property will be eliminated from the Purchased Assets and the Purchase Price shall be reduced by the Allocated Value of the Preference Property.

(c) If

(i) a third party brings any suit, action or other proceeding prior to the Closing seeking to restrain, enjoin or otherwise prohibit the consummation of the transactions contemplated hereby in connection with a claim to enforce a Preference Right;

(ii) a Purchased Asset is subject to a Transfer Requirement that provides that transfer of such Purchased Asset without compliance with such Transfer Requirement will result in termination or other material impairment of any rights in relation to such Purchased Asset, and such Transfer Requirement is not waived, complied with or otherwise satisfied prior to the Closing Date; or

(iii) the holder of a Preference Right does not elect to purchase such Preference Property or waive such Preference Right with respect to the transactions contemplated by this Agreement prior to the Closing Date and the time in which the Preference Right may be exercised has not expired;

then, unless otherwise agreed by Sellers and Buyer, the Purchased Asset or portion thereof affected by such Preference Right or Transfer Requirement (a “Retained Asset”) shall be held back from the Purchased Assets to be transferred and conveyed to Buyer at Closing and the Purchase Price to be paid at Closing shall be reduced by the Allocated Value of such Retained Asset. Any Retained Asset so held back at the initial Closing will be conveyed to Buyer at a delayed Closing (which shall become the new Closing Date with respect to such Retained Asset), within ten (10) days following the date on which the suit, action or other proceeding, if any, referenced in clause (i) above is settled or a judgment is rendered (and no longer subject to appeal) permitting transfer of the Retained Asset to Buyer pursuant to this Agreement and Seller obtains, complies with, obtains a waiver of or notice of election not to exercise or otherwise satisfies all remaining Preference Rights and Transfer Requirements with respect to such Retained Asset as contemplated by this Section (or if multiple Purchased Assets are Retained Assets, on a date mutually agreed to by the Parties in order to consolidate, to the extent reasonably possible, the number of Closings). At the delayed Closing, Buyer shall pay Seller a purchase price equal to the amount by which the Purchase Price was reduced on account of the holding back of such Retained Asset (as adjusted pursuant toSection 1.7 through the new Closing Date therefor); provided, however, if all such Preference Rights and Transfer Requirements with respect to any Retained Asset so held back at the initial Closing are not obtained, complied with, waived or otherwise satisfied as contemplated by this Section within one hundred eighty (180) days after the initial Closing has occurred with respect to any Purchased Asset, then such Retained Asset shall be eliminated from the Purchased Assets and shall become an Excluded Asset, unless Seller and Buyer agree to proceed with a closing on such Retained Asset, in which case Buyer shall be deemed to have waived any objection (and shall be obligated to indemnify the Seller Indemnitees for all Losses) with respect to non-compliance with such Preference Rights and Transfer Requirements with respect to such Retained Asset(s).

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ARTICLE VII

CONDITIONS TO CLOSING

7.1Conditions to Each Party’s Obligations. The respective obligations of each Party to consummate the Closing are subject to (a) all applicable waiting periods (and any extensions thereof), if any, under the Hart-Scott-Rodino Act having expired or otherwise been terminated and (b) no Party exercises its right to terminate due to reductions in the Purchase Price pursuant toSection 1.8.

7.2Conditions to Obligations of Buyer. Each and every obligation of Buyer under this Agreement (except for the obligations of Buyer to be fulfilled prior to the Closing and obligations that survive termination of this Agreement), including the obligation of Buyer to consummate the Closing, shall be subject to the satisfaction, on or before the Closing, of each of the conditions set forth in thisSection 7.2, unless waived in writing by Buyer.

(a) Sellers shall have obtained at their own expense (and shall have provided copies thereof to Buyer) all of the waivers, permits, consents, approvals or other authorizations, and effected all of the registrations, filings and notices, as contemplated bySection 5.2, with respect to Governmental Entities, which are required on the part of Sellers, except for (i) any waivers, permits, consents, approvals, licenses or other authorizations which may be delivered or issued subsequent to the Closing Date pursuant to applicable law, rule or regulation relating to such waiver, permit, consent, approval, license or other authorization; and (ii) any failure to provide the appropriate notice or obtain the appropriate permit, authorization, consent or approval, or where any such conflict, breach, default, acceleration, termination, modification or cancellation, or any such imposition of any Security Interest, has not had or would not reasonably be expected to have, individually or in the aggregate, a Seller Material Adverse Effect or a material adverse effect on the ability of the Parties to consummate the transactions contemplated by this Agreement.

(b) The representations and warranties of Sellers set forth in this Agreement that are qualified as to materiality shall be true and correct and the representations and warranties of Sellers that are not qualified as to materiality shall be true and correct in all material respects, in each case, as of the Closing as though made as of the Closing, provided that, to the extent that any such representation or warranty speaks as of a specified date, it need only be true and correct as of such specified date.

(c) Sellers shall have performed or complied with in all material respects their agreements and covenants required to be performed or complied with under this Agreement as of or prior to the Closing.

(d) No Legal Proceeding shall be pending wherein an unfavorable judgment, order, decree, stipulation or injunction would (i) prevent consummation of the transactions contemplated by this Agreement, or (ii) cause the transactions contemplated by this Agreement to be rescinded following consummation.

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(e) Sellers shall have delivered to Buyer the Sellers Certificates.

(f) Buyer shall have received such other certificates and instruments (including certificates of good standing of Sellers in their jurisdiction of organization, formation or incorporation, as applicable, and the various foreign jurisdictions in which they are qualified, certified charter documents, certificates as to the incumbency of officers and the adoption of authorizing resolutions) as it shall reasonably request in connection with the Closing.

(g) Sellers shall have obtained consents and/or waivers to all Preference Rights and Transfer Requirements set forth onSchedule 3.12.

(h) Sellers shall have delivered to Buyer evidence that the liens set forth onSchedule 3.7(d) have been released.

7.3Conditions to Obligations of Sellers. Each and every obligation of Sellers under this Agreement (except for the obligations of Sellers to be fulfilled prior to the Closing and obligations that survive termination of this Agreement), including the obligation of Sellers to consummate the Closing, shall be subject to the satisfaction, on or before the Closing, of each of the conditions set forth in thisSection 7.3, unless waived in writing by Sellers.

(a) Buyer shall have obtained at its own expense (and shall have provided copies thereof to Sellers) all of the waivers, permits, consents, approvals or other authorizations, and effected all of the registrations, filings and notices, as contemplated bySection 5.2, with respect to Governmental Entities, which are required on the part of Buyer, except for (i) any waivers, permits, consents, approvals, licenses or other authorizations which may be delivered or issued subsequent to the Closing Date pursuant to applicable law, rule or regulation relating to such waiver, permit, consent, approval, license or other authorization; and (ii) any failure to provide the appropriate notice or obtain the appropriate permit, authorization, consent or approval, or where any such conflict, breach, default, acceleration, termination, modification or cancellation, or any such imposition of any Security Interest, has not had or would not reasonably be expected to have, individually or in the aggregate, a Buyer Material Adverse Effect or a material adverse effect on the ability of the Parties to consummate the transactions contemplated by this Agreement.

(b) The representations and warranties of Buyer set forth in this Agreement that are qualified as to materiality shall be true and correct and the representations and warranties of Buyer that are not qualified as to materiality shall be true and correct in all material respects, in each case, as of the Closing as though made as of the Closing, provided that, to the extent that any such representation or warranty speaks as of a specified date.

(c) Buyer shall have performed or complied with in all material respects its agreements and covenants required to be performed or complied with under this Agreement as of or prior to the Closing.

(d) No Legal Proceeding shall be pending or threatened wherein an unfavorable judgment, order, decree, stipulation or injunction would (i) prevent consummation of the transactions contemplated by this Agreement, or (ii) cause the transactions contemplated by this Agreement to be rescinded following consummation.

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(e) Buyer shall have delivered to Sellers the Buyer Certificate.

(f) Sellers shall have received such other certificates and instruments (including certificates of good standing of Buyer in its jurisdiction of organization, certified charter documents, certificates as to the incumbency of officers and the adoption of authorizing resolutions) as they shall reasonably request in connection with the Closing.

(g) Buyer is ready to deliver the Closing Date Aggregate Purchase Price by wire transfer to Sellers in immediately available funds.

ARTICLE VIII

INDEMNIFICATION

8.1Indemnification by Sellers. Subject to the limitations set forth inSection 8.5, and provided that Buyer makes a written claim for indemnification against Sellers pursuant toSection 8.3, to the extent applicable, andSection 11.8, within the survival period (if there is an applicable survival period pursuant toSection 8.4, below), then Sellers shall be obligated severally, but not jointly, to indemnify Buyer, Buyer’s permitted assigns and Affiliates and their respective partners, directors, members, shareholders, officers, employees and agents (collectively, “Buyer Indemnitees”) from and against the entirety of any Damages the Buyer Indemnitees may suffer resulting from, arising out of, relating to, in the nature of, or caused by the following:

(a) any breach by such Seller of any of its representations, warranties and covenants contained in this Agreement and the Seller Related Documents;

(b) any Title Defects subject toSection 6.11(c);

(c) any Excluded Liabilities; or

(d) the litigation set forth onSchedule 3.8 or Losses resulting from the failure to receive the consent of Richard G. Gawenis, Sherry Gawenis, Arlee Walls and Zelda Walls to the assignment of the Leases referred to onSchedule 3.4.

8.2Indemnification by Buyer. Subject to the limitations set forth inSection 8.5, and provided that a Seller makes a written claim for indemnification against Buyer pursuant toSection 8.3, to the extent applicable, andSection 11.8, within the survival period (if there is an applicable survival period pursuant toSection 8.4, below), then Buyer shall indemnify Sellers, Sellers’ permitted assigns and Affiliates and their respective partners, directors, members, shareholders, officers, employees and agents (collectively, “Seller Indemnitees”) from and against the entirety of any Damages the Seller Indemnitees may suffer resulting from, arising out of, relating to, in the nature of, or caused by the following:

(a) Buyer breaches any of its representations, warranties, and covenants contained in this Agreement and the Buyer Related Documents;

(b) non-compliance with any bulk-sale statutes; or

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(c) any Assumed Liability.

8.3Indemnification Claims.

(a) (i) If any third party notifies any Indemnified Party with respect to any matter (a “Third Party Claim “) that may give rise to a claim for indemnification against an Indemnifying Party underArticle VIII, then the Indemnified Party shall promptly give written notification to the Indemnifying Party thereof. Such notification shall be given within ten (10) days after receipt by the Indemnified Party of notice of such Third Party Claim, and shall describe in reasonable detail (to the extent known by the Indemnified Party) the facts constituting the basis for such Third Party Claim and the amount of the claimed damages (if available); provided, however, that no delay or failure on the part of the Indemnified Party in so notifying the Indemnifying Party shall relieve the Indemnifying Party of any liability or obligation hereunder except to the extent of any damage or liability caused by or arising out of such failure.

(ii) The Indemnifying Party may, upon written notice thereof to the Indemnified Party, assume control of the defense of such Third Party Claim with counsel reasonably satisfactory to the Indemnified Party; provided that (i) the Indemnifying Party notifies the Indemnified Party in writing within thirty (30) days after the Indemnified Party has given notice of the Third Party Claim that the Indemnifying Party will indemnify the Indemnified Party from and against the Damages the Indemnified Party may suffer resulting from, arising out of, relating to, in the nature of, or caused by the Third Party Claim (subject to the provisions of thisArticle VIII); (ii) thead damnum, if any, is less than or equal to the amount of Damages for which the Indemnifying Party is liable under thisArticle VIII; (iii) the Indemnifying Party provides the Indemnified Party with evidence acceptable to the Indemnified Party that the Indemnifying Party will have the financial resources to defend against the Third Party Claim and fulfill its indemnification obligations hereunder; (iv) the Third Party Claim does not involve criminal liability and seeks only money damages and not equitable relief against the Indemnified Party; (v) settlement of, or an adverse judgment with respect to, the Third Party Claim is not, in the good faith judgment of the Indemnified Party, likely to establish a precedential custom or practice adverse to the continuing business interests or the reputation of the Indemnified Party, and (vi) the Indemnifying Party conducts the defense of the Third Party Claim actively and diligently.

(iii) If the Indemnifying Party does not, or is not permitted under the terms hereof to, so assume control of the defense of a Third Party Claim, the Indemnified Party shall control such defense.

(iv) The Non-controlling Party may participate in such defense at its own expense. The Controlling Party shall keep the Non-controlling Party advised of the status of such Third Party Claim and the defense thereof and shall consider in good faith recommendations made by the Non-controlling Party with respect thereto. The Non-controlling Party shall furnish the Controlling Party with such information as it may have with respect to such Third Party Claim (including copies of any summons, complaint or other pleading which may have been served on such party and any written claim, demand, invoice, billing or other document evidencing or asserting the same) and shall otherwise cooperate with and assist the Controlling Party in the defense of such Third Party Claim. The reasonable fees and expenses of

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counsel to the Indemnified Party with respect to a Third Party Claim shall be considered Damages for purposes of this Agreement if (x) the Indemnified Party controls the defense of such Third Party Claim pursuant to the terms of thisSection 8.3(a) or (y) the Indemnifying Party assumes control of such defense and the Indemnified Party reasonably concludes that the Indemnifying Party and the Indemnified Party have conflicting interests or different defenses available with respect to such Third Party Claim.

(v) The Indemnifying Party shall not agree to any settlement of, or the entry of any judgment arising from, any Third Party Claim without the prior written consent of the Indemnified Party, which shall not be unreasonably withheld or delayed; provided that the consent of the Indemnified Party shall not be required if the Indemnifying Party agrees in writing to pay any amounts payable pursuant to such settlement or judgment and such settlement or judgment includes a complete release of the Indemnified Party from further liability and has no other adverse effect on the Indemnified Party. The Indemnified Party shall not agree to any settlement of, or the entry of any judgment arising from, any such Third Party Claim without the prior written consent of the Indemnifying Party, which shall not be unreasonably withheld or delayed.

(b) Within twenty (20) days after delivery of the notification of a Third Party Claim as provided inSection 8.3(a)(i) (a “Claim Notice”), the Indemnifying Party shall deliver to the Indemnified Party a response, in which the Indemnifying Party shall: (i) agree that the Indemnified Party is entitled to receive all of the Claimed Amount (in which case the Response shall be accompanied by a payment by the Indemnifying Party to the Indemnified Party of the Claimed Amount to the extent the Claimed Amount may be finally determined at that time, by check or by wire transfer (provided that to the extent the Claimed Amount may not be finally determined at that time, the Indemnifying Party shall pay the Indemnified Party such additional amounts as to constitute the full Claimed Amount at such time as the full Claimed Amount can be finally determined)), (ii) agree that the Indemnified Party is entitled to receive the Agreed Amount (in which case the Response shall be accompanied by a payment by the Indemnifying Party to the Indemnified Party of the Agreed Amount, by check or by wire transfer), or (iii) dispute that the Indemnified Party is entitled to receive any of the Claimed Amount.

(c) During the thirty (30)-day period following the delivery of a Response that reflects a Dispute, the Indemnifying Party and the Indemnified Party shall use good faith efforts to resolve the Dispute. If the Dispute is not resolved within such thirty (30)-day period, the Indemnifying Party and the Indemnified Party shall discuss in good faith the submission of the Dispute to binding arbitration, and if the Indemnifying Party and the Indemnified Party agree in writing to submit the Dispute to such arbitration, then the provisions ofSection 8.3(d) shall become effective with respect to such Dispute. The provisions of thisSection 8.3(c) shall not obligate the Indemnifying Party and the Indemnified Party to submit to arbitration or any other alternative dispute resolution procedure with respect to any Dispute, and in the absence of an agreement by the Indemnifying Party and the Indemnified Party to arbitrate a Dispute, such Dispute shall be resolved in a state or federal court sitting in Houston, Texas, in accordance withSection 11.12.

(d) If, as set forth inSection 8.3(c), the Indemnified Party and the Indemnifying Party agree to submit any Dispute to binding arbitration, the arbitration shall be conducted by a single arbitrator (the “Arbitrator”) in accordance with the Commercial Rules in effect from time to time and the following provisions:

(i) In the event of any conflict between the Commercial Rules in effect from time to time and the provisions of this Agreement, the provisions of this Agreement shall prevail and be controlling.

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(ii) The parties shall commence the arbitration by jointly filing a written submission with the Houston, Texas office of the AAA in accordance with Commercial Rule 5 (or any successor provision).

(iii) No depositions or other discovery shall be conducted in connection with the arbitration.

(iv) Not later than thirty (30) days after the conclusion of the arbitration hearing, the Arbitrator shall prepare and distribute to the parties a writing setting forth the arbitral award and the Arbitrator’s reasons therefor. Any award rendered by the Arbitrator shall be final, conclusive and binding upon the parties, and judgment thereon may be entered and enforced in any court of competent jurisdiction (subject toSection 11.12), provided that the Arbitrator shall have no power or authority to (x) award damages in excess of the portion of the Claimed Amount that is subject to such Dispute, (y) award multiple, consequential, punitive or exemplary damages, or (z) grant injunctive relief, specific performance or other equitable relief.

(v) The Arbitrator shall have no power or authority, under the Commercial Rules or otherwise, to (x) modify or disregard any provision of this Agreement, including the provisions of thisSection 8.3(d), or (y) address or resolve any issue not submitted by the parties.

(vi) In connection with any arbitration proceeding pursuant to this Agreement, each party shall bear its own costs and expenses, except that the fees and costs of the AAA and the Arbitrator, the costs and expenses of obtaining the facility where the arbitration hearing is held, and such other costs and expenses as the Arbitrator may determine to be directly related to the conduct of the arbitration and appropriately borne jointly by the parties (which shall not include any party’s attorneys’ fees or costs, witness fees (if any), costs of investigation and similar expenses) shall be shared equally by the Indemnified Party and the Indemnifying Party.

(e) Notwithstanding the other provisions of thisSection 8.3, if a third party asserts (other than by means of a lawsuit) that an Indemnified Party is liable to such third party for a monetary or other obligation which may constitute or result in Damages for which such Indemnified Party may be entitled to indemnification pursuant to thisArticle VIII, and such Indemnified Party reasonably determines that it has a valid business reason to fulfill such obligation, then (i) such Indemnified Party shall be entitled to satisfy such obligation, without prior notice to or consent from the Indemnifying Party, (ii) such Indemnified Party may subsequently make a claim for indemnification in accordance with the provisions of thisArticle VIII and (iii) such Indemnified Party shall be reimbursed, in accordance with the provisions of thisArticle VIII, for any such Damages for which it is entitled to indemnification

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pursuant to thisArticle VIII (subject to the right of the Indemnifying Party to dispute the Indemnified Party’s entitlement to indemnification, or the amount for which it is entitled to indemnification, under the terms of thisArticle VIII).

8.4Survival of Representations, Warranties and Covenants.

(a) The representations and warranties made by Sellers in this Agreement or any certificate required to be delivered at Closing to Buyer, and the representations and warranties of Buyer or any certificate required to be delivered at Closing to Sellers, and the covenants and agreements of Sellers and Buyer which by their terms do not contemplate performance after the Closing, shall survive the Closing and remain in full force and effect for six (6) months following the Closing Date. The foregoing notwithstanding, the representations and warranties inSections 3.1,3.2,3.9 and3.13 shall survive until the expiration of the applicable limitations period, and the indemnification set forth inSection 8.1(d) shall survive until the final, non-appealable judgment of a court of competent jurisdiction relating to the litigation set forth onSchedule 3.8.

(b) The rights to indemnification set forth in thisArticle VIII shall not be affected by (i) any investigation conducted by or on behalf of an Indemnified Party or any knowledge acquired (or capable of being acquired) by an Indemnified Party, whether before or after the Closing Date, with respect to the inaccuracy or noncompliance with any representation, warranty, covenant or obligation which is the subject of indemnification hereunder or (ii) any waiver by an Indemnified Party of any closing condition relating to the accuracy of representations and warranties or the performance of or compliance with agreements and covenants.

8.5Limitations.

(a) Sellers shall not have any obligation to indemnify the Buyer Indemnitees from and against any Damages underSection 8.1(a), other than Damages resulting by reason of any fraud or intentional misrepresentation, until the Buyer Indemnitees have suffered Damages by reason of all such breaches in excess of one percent (1%) of the Purchase Price aggregated deductible (after which point Sellers will be obligated, severally, but not jointly, to indemnify the Buyer Indemnitees from and against all such Damages in excess of the first one percent (1%) of the Purchase Price) and such indemnification obligation shall not exceed ten percent (10%) of the Purchase Price except in the case of fraud or intentional misrepresentation; provided, however, that the foregoing thresholds and limitations shall not apply to any indemnification provided by Sellers arising out of any Title Defects subject toSection 6.11(c) orSection 6.2(b) or the representations and warranties inSections 3.1,3.2,3.9 and3.13.

(b) Buyer shall not have any obligation to indemnify the Seller Indemnitees from and against Damages underSection 8.2(a), other than Damages resulting by reason of any fraud or intentional misrepresentation, until the Seller Indemnitees have suffered Damages by reason of all such breaches in excess of one percent (1%) of the Purchase Price aggregated deductible (after which point Buyer will be obligated to indemnify the Seller Indemnitees from and against all such Damages in excess of the first one percent (1%) of the Purchase Price) and such indemnification obligation shall not exceed ten percent (10%) of the Purchase Price except in the case of fraud or intentional misrepresentation.

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(c) The rights of the Indemnified Parties under thisArticle VIII shall be the exclusive remedy of the Indemnified Parties with respect to any and all matters arising out of, relating to, or connected with this Agreement, Sellers and their assets and liabilities, including, without limitation, the Purchased Assets and the Assumed Liabilities; provided, however, that notwithstanding any other provision of this Agreement, nothing herein shall limit any claim of any Party for remedies at law or in equity for fraud or intentional misrepresentations.

(d) The amount of Damages recoverable by an Indemnified Party under thisArticle VIII shall be reduced by any proceeds received by such Indemnified Party or an Affiliate, with respect to the Damages to which such indemnity claim relates, from an insurance carrier or any third party. Each Indemnified Party shall use its Reasonable Best Efforts to seek payment or reimbursement for any Damages from its insurance carrier or other collateral sources. In the event that an Indemnified Party shall receive funds from any insurance carrier or collateral source with respect to any Damages, any such amounts so received shall be payable to the Indemnifying Party, regardless of when received by the Indemnified Party, up to such amount previously paid by the Indemnifying Party or their Affiliates with respect to such Damages.

(e) Notwithstanding anything to the contrary contained in this Agreement, following a determination that the Indemnifying Party is obligated to indemnify the Indemnified Party pursuant toSections 8.1(a) or8.2(a), and subject to the deductible amounts set forth inSections 8.5(a) or8.5(b), and solely for purposes of determining the amount of any Damages that are the subject matter of a claim for indemnification hereunder, each representation and warranty in this Agreement and each certificate or document delivered pursuant hereto shall be read without regard and without giving effect to the term(s) “material” or “Material Adverse Effect” in each instance where the effect of including such term(s) would be to make such representation and warranty less restrictive (as if such words and surrounding related words (e.g., “reasonably be expected to,” “could have” and similar restrictions and qualifiers) were deleted from such representations and warranty).

8.6Treatment of Indemnification Payments. The Parties hereto agree to treat all indemnification payments made pursuant to thisArticle VIII (including, without limitation, payments pursuant toSections 8.1 and8.2) as adjustments to the Purchase Price for all income Tax purposes and to take no position contrary thereto in any Tax Return or audit or examination by, or proceeding before, any taxing authority, except as required by a change in law or a “determination” as defined in Section 1313 of the Code and the Treasury Regulations thereunder.

ARTICLE IX

TERMINATION

9.1Termination.

(a) This Agreement may be terminated and the transactions contemplated hereby abandoned at any time prior to the Closing:

(i) by mutual written consent of Buyer and Sellers;

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(ii) by Buyer or Sellers if a court of competent jurisdiction or other Governmental Entity shall have issued a nonappealable final order, decree or ruling or taken any other action, in each case having the effect of permanently restraining, enjoining or otherwise prohibiting the Closing, unless the Party relying on such order, decree or ruling or other action has not complied in all material respects with its obligations under this Agreement;

(iii) by Buyer if:

(A) the Closing shall not have occurred on or before December 31, 2007 by reason of the failure of any condition precedent underSection 7.1 orSection 7.2 (unless the failure results primarily from a breach by Buyer of any representation, warranty or covenant contained in this Agreement); or

(B) Sellers are in breach of any representation, warranty or covenant contained in this Agreement, and such breach would reasonably be expected to result in aggregated Damages to the Buyer in excess of ten percent (10%) of the Purchase Price.

(iv) by Sellers if:

(A) the Closing shall not have occurred on or before December 31, 2007 by reason of the failure of any condition precedent underSection 7.1 orSection 7.3 (unless the failure results primarily from a breach by Sellers of any representation, warranty or covenant contained in this Agreement); or

(B) Buyer is in breach of any representation, warranty or covenant contained in this Agreement, and such breach would reasonably be expected to result in aggregated Damages to Sellers in excess of ten percent (10%) of the Purchase Price.

(b) The Party desiring to terminate this Agreement pursuant toSection 9.1(a) shall give written notice of such termination to the other Parties.

9.2Effect of Termination. In the event of termination of this Agreement as provided inSection 9.1, this Agreement shall immediately become void and there shall be no liability or obligation on the part of Sellers or Buyer or their respective officers, directors, stockholders or Affiliates, except as set forth inSection 9.3;provided,however,that the provisions ofSection 5.4,Section 9.3 andArticle XI of this Agreement shall remain in full force and effect and survive any termination of this Agreement.

9.3Remedies. Any party terminating this Agreement pursuant toSection 9.1 shall have the right to recover damages sustained by such party as a result of any breach by the other party of any representation, warranty, covenant or agreement contained in this Agreement or fraud or willful misrepresentation; provided, however, that the party seeking relief is not in breach of any representation, warranty, covenant or agreement contained in this Agreement under circumstances which would have permitted the other party to terminate the Agreement underSection 9.1.

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ARTICLE X

DEFINITIONS

For purposes of this Agreement, each of the following terms shall have the meaning set forth below.

“AAA” shall mean the American Arbitration Association.

“Affiliate” shall mean any affiliate, as defined in Rule 12b-2 under the Securities Exchange Act of 1934, as amended.

“Agreed Amount” shall mean part, but not all, of the Claimed Amount.

“Agreement” shall have the meaning ascribed to it in the first paragraph of this Agreement.

“Allocated Value” or “Allocated Values” shall have the meaning ascribed to it inSection 1.6 hereof.

“Alta” shall have the meaning ascribed to it in the first paragraph of this Agreement.

“Arbitrator” shall have the meaning ascribed to it inSection 8.3(d)hereof.

“Assessment” shall have the meaning ascribed to it inSection 5.8(b) hereof.

“Assigned Contract” or “Assigned Contracts” shall have the meaning ascribed to it inSection 1.1(d) hereof.

“Assignment and Bill of Sale” shall have the meaning ascribed to it inSection 2.2(a) hereof.

“Assumed Liabilities” means (a) all Liabilities and obligations of Sellers under or associated with or appurtenant to the Assigned Contracts, the Leases and the other arrangements included in the Purchased Assets and all Liabilities arising out of Buyer’s operations and/or ownership of the Purchased Assets from and after the Effective Time, (b) all Liabilities of Sellers for transfer, sales, use and other non-income Taxes arising in connection with the consummation of the transactions contemplated hereby, and (c) all Assumed Title Liabilities.

“Assumed Title Liabilities” shall have the meaning ascribed to it inSection 6.9 hereof.

“Buyer” shall have the meaning ascribed to it in the first paragraph of this Agreement.

“Buyer Certificate” shall mean a certificate of an officer of Buyer to the effect that each of the conditions specified inSection 7.3(a) through(d) (insofar as clause(d) relates to Legal Proceedings involving Buyer) ofSection 7.3 is satisfied in all respects or deemed waived as provided inSection 7.3.

“Buyer Indemnitees” shall have the meaning ascribed to it inSection 8.1 hereof.

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“Buyer Material Adverse Effect” shall mean any material adverse change, event, circumstance or development that is reasonably likely to impair materially Buyer’s ability to perform its obligations under this Agreement. For the avoidance of doubt, the Parties agree that the terms “material”, “materially” or “materiality” as used in this Agreement with an initial lower case “m” shall have their respective customary and ordinary meanings, without regard to the meaning ascribed to Buyer Material Adverse Effect.

“Buyer Related Documents” shall have the meaning ascribed to it inSection 4.2(b) hereof.

“Claim Notice” shall have the meaning ascribed to it inSection 8.3(b) hereof.

“Claimed Amount” shall mean the amount of any Damages incurred or reasonably expected to be incurred by the Indemnified Party.

“Closing” shall mean the closing of the transactions contemplated by this Agreement.

“Closing Date” shall have the meaning ascribed to it inSection 2.1 hereof.

“Closing Date Aggregate Purchase Price” shall have the meaning ascribed to it inSection 1.9 hereof.

“Closing Date Estimated Purchase Price Adjustment” shall have the meaning ascribed to it inSection 1.9 hereof.

“Code” shall mean the Internal Revenue Code of 1986, as amended, and any successor law.

“Commercial Rules” shall mean the Commercial Arbitration Rules of the AAA.

“Confidentiality Agreement” shall have the meaning ascribed to it inSection 5.6 hereof.

“Contango” shall have the meaning ascribed to it in the first paragraph of this Agreement.

“Controlling Party” shall mean the party controlling the defense of any Third Party Claim.

“Damages” shall mean all actions, suits, proceedings, hearings, investigations, charges, complaints, claims, demands, injunctions, judgments, orders, decrees, rulings, damages, dues, penalties, fines, costs, amounts paid in settlement, Liabilities, obligations, Taxes, liens, losses, expenses, and fees, including court costs and reasonable legal fees and expenses.

“Defensible Title” shall have the meaning ascribed to it inSection 6.2 hereof.

“Development Acreage” shall have the meaning ascribed to it inSection 6.3 hereof.

“Dispute” shall mean the dispute resulting if the Indemnifying Party in a Response disputes its liability for all or part of the Claimed Amount.

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“Effective Time” means 12:01 a.m. Central time on October 1, 2007.

“Environmental Laws” means, as the same may have been amended, any federal, state or local statute, law, regulation, ordinance, rule, order or decree including any rule of common law, relating to (i) the control of any potential pollutant or protection of the environment, including air, water or land, (ii) the generation, handling, treatment, storage, disposal or transportation of waste materials, or (iii) the regulation of or exposure to hazardous, toxic or other substances alleged to be harmful, including, but not limited to, the Comprehensive Environmental Response, Compensation and Liability Act, 42 U.S.C. § 9601 et seq. (“CERCLA”); the Resource Conservation and Recovery Act, 42 U.S.C. § 6901 et seq. (“RCRA”); the Federal Water Pollution Control Act, 33 U.S.C. § 1251 et seq.; the Clean Air Act, 42 U.S.C. § 7401 et seq. the Hazardous Materials Transportation Act, 49 U.S.C. § 1471 et seq.; the Toxic Substances Control Act, 15 U.S.C. §§ 2601 through 2629; the Oil Pollution Act, 33 U.S.C. § 2701 et seq.; the Emergency Planning and Community Right-to-Know Act, 42 U.S.C. § 11001 et seq.; the Safe Drinking Water Act, 42 U.S.C. §§ 300f through 300j; the Federal Insecticide, Fungicide and Rodenticide Act, 7 U.S.C. § 136 et seq.; the Occupational Safety and Health Act, 29 U.S.C. § 651 et seq.; the Atomic Energy Act, 42 U.S.C. § 2011 et seq. ; and all applicable related law, whether local, state, territorial, or national, of any Governmental Entity having jurisdiction over the property in question addressing pollution or protection of human health, safety, natural resources or the environment and all regulations implementing the foregoing. The term “Environmental Laws” includes all judicial and administrative decisions, orders, directives, and decrees issued by a Governmental Entity pursuant to the foregoing.

“Equipment” shall have the meaning ascribed to it inSection 1.1(c) hereof.

“Excluded Assets” shall have the meaning ascribed to it inSection 1.2 hereof.

“Excluded Liabilities” shall have the meaning ascribed to it inSection 1.4 hereof.

“Farmout Agreement” means that certain Farmout Agreement entered into effective January 1, 2006 by and between MND and GPM, as amended effective January 1, 2006.

“Final Post-Closing Purchase Price Adjustment Amount” shall have the meaning ascribed to it inSection 1.10(d)(v) hereof.

“Final Post-Closing Purchase Price Adjustment Statement” shall have the meaning ascribed to it inSection 1.10(d)(i) hereof.

“Final Post-Closing True-Up Amount” shall have the meaning ascribed to it inSection 1.10(d)(v)(C) hereof.

“GAAP” shall mean United States generally accepted accounting principles.

“Governmental Entity” shall mean any court, arbitrational tribunal, administrative agency or commission or other governmental or regulatory authority or agency.

“GPM” shall have the meaning ascribed to it in the first paragraph of this Agreement.

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“Hart-Scott-Rodino Act” shall mean the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended.

“Hydrocarbons” means oil, gas and/or other liquid or gaseous hydrocarbons or any combination thereof.

“Imbalance” or “Imbalances” means any over-production, under-production, over-delivery, under-delivery or similar imbalance of Hydrocarbons produced from or allocated to the Purchased Assets, regardless of whether such over-production, under-production, over-delivery under-delivery or similar imbalance arises at the platform, wellhead, pipeline, gathering system, transportation system, processing plant or other location.

“Indemnified Party” shall mean a party entitled, or seeking to assert rights, to indemnification underArticle VIII.

“Indemnifying Party” shall mean the party from whom indemnification is sought by the Indemnified Party.

“Independent Accounting Firm” shall have the meaning ascribed to it inSection 1.10(d)(iv) hereof.

“Initial Post-Closing Estimated Purchase Price Adjustment Amount” shall have the meaning ascribed to it inSection 1.10(c) hereof.

“Initial Post-Closing Purchase Price Adjustment Statement” shall have the meaning ascribed to it inSection 1.10(a) hereof.

“Initial Post-Closing True-Up Amount” shall have the meaning ascribed to it inSection 1.10(c)(iii) hereof.

“Interest Rate” means eight percent (8%) per annum, compounded quarterly, computed on the basis of a three hundred sixty (360) day year for actual days elapsed.

“Knowledge” means the current actual knowledge of (a) Kenneth R. Peak, when applied to Contango, (b) Joe Greenberg, Jennifer McCarthy and Yvonne Cormack, when applied to Alta, (c) Spiros N. Vassilakis, when applied to MND or GPM, (d) Townes G. Pressler, when applied to Tepee and (e) the executive officers of Buyer, when applied to Buyer.

“Lease” or “Leases” shall have the meaning ascribed to it inSection 1.1(a) hereof.

“Legal Proceeding” shall mean any action, suit, proceeding, claim, arbitration or investigation before any Governmental Entity or before any arbitrator.

“Liabilities” means, with respect to any Person, such Person’s liabilities, obligations and commitments.

“Lien” means, with respect to any property or asset, any mortgage, lien, pledge, charge, security interest or other encumbrance in respect of such property or asset.

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“Losses” means any and all debts, obligations and other liabilities (whether absolute, accrued, contingent, fixed or otherwise, or whether known or unknown, or due or to become due or otherwise), diminution in value, monetary damages, fines, fees, Taxes, penalties, interest obligations, deficiencies, losses and expenses (including amounts paid in settlement, interest, court costs, costs of investigators, reasonable fees and expenses of attorneys, accountants, financial advisors and other experts, and other actual out of pocket expenses incurred in investigating and preparing for or in connection with any Proceeding; however, excluding special, punitive, exemplary, consequential or indirect damages, except to the extent a party is required to pay such damages to a third party in connection with a matter for which such Party is entitled to indemnification underArticle VIII).

“MND” shall have the meaning ascribed to it in the first paragraph of this Agreement.

“Net Revenue Interest” mean the percentage share in all oil, gas and other Hydrocarbons produced from a well, lease, unit or other Oil and Gas Interest after satisfaction of applicable lessor royalties, overriding royalties, oil payments and other payments out of or measured by the production of oil, gas and other Hydrocarbons from such well, lease, unit or other Oil and Gas Interest.

“Non-controlling Party” shall mean the party not controlling the defense of any Third Party Claim.

“Objection Date” shall have the meaning ascribed to it inSection 6.8 hereof.

“Oil and Gas Documents” means the Leases and Assigned Contracts comprising a portion of the Oil and Gas Interests.

“Oil and Gas Interest(s)” means (a) all interests in and rights with respect to oil, gas, mineral and related properties and assets of any kind and nature, direct or indirect, including working, royalty interests, production payments, operating rights, net profits interests, fee minerals, fee royalties, other non-working interests and non-operating interests; (b) interests in and rights with respect to Hydrocarbons and other minerals or revenues therefrom and contracts in connection therewith and claims and rights thereto (including oil and gas leases, operating agreements, unitization and pooling agreements and orders, division order, transfer orders, mineral deeds, royalty deeds, oil and gas sales, exchange and processing contracts and agreements and, in each case, interests thereunder), surface interests, fee interests, reservations and concessions; (c) easements, rights of way, licenses, permits, leases, and other interests associated with, appurtenant to, or necessary for the operation of any of the foregoing; and (d) interests in equipment and machinery (including well equipment and machinery), oil and gas production, gathering, transmission, compression, treating, processing and storage facilities (including tanks, tank batteries, pipelines and gathering systems), pumps, water plants, electric plants, gasoline and gas processing plants, refineries and other tangible personal property and fixtures associated with, appurtenant to, or necessary for the operation of any of the foregoing, in each case to the extent such interests comprise a part of the Purchased Assets.

“ORRI Assignment” shall have the meaning ascribed to it inSection 2.2(b) hereof.

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“Participation Agreement” means that certain Participation Agreement, entered into effective March 3, 2005, by and among Alta, Contango and MND, as assignee of the rights, title and interests of Mitchell Asset Management, L.P. thereunder.

“Parties” shall mean Buyer and Sellers.

“Permitted Encumbrances” shall have the meaning ascribed to it inSection 6.5 hereof.

“Permitted Liens” means with respect to each Seller (a) liens for current real or personal property taxes not yet due and payable and with respect to which such Seller maintains adequate reserves, (b) workers’, carriers’ and mechanics’ or other like liens incurred in the ordinary course of such Seller’s business with respect to which payment is not due and that do not impair the present use of the affected property, and (c) liens that are immaterial in character, amount, and extent and which do not detract from the value or interfere with the present or proposed use of the properties they affect.

“Person” means an individual, a corporation, a partnership, a limited liability company, a trust, an unincorporated association, a Governmental Entity or any agency, instrumentality or political subdivision of a Governmental Entity, or any other entity or body.

“Preference Property” shall have the meaning ascribed to it inSection 6.14(b) hereof.

“Preference Right” means any right or agreement that enables any Person to purchase or acquire any Purchased Asset or any interest therein or portion thereof as a result of or in connection with (i) the sale, assignment or other transfer of any Purchased Asset or any interest therein or portion thereof or (ii) the execution or delivery of this Agreement or the consummation or performance of the terms and conditions contemplated by this Agreement.

“Proceeding” means any proceeding, arbitration, action, suit, pending settlement, or other legal proceeding of any kind or nature before or by any Governmental Entity.

“Purchase Price” shall have the meaning ascribed to it inSection 1.5 hereof.

“Purchase Price Adjustment” shall have the meaning ascribed to it inSection 1.7(b) hereof.

“Purchased Assets” shall have the meaning ascribed to it inSection 1.1 hereof.

“Reasonable Best Efforts” shall mean best efforts, to the extent commercially reasonable.

“Reasonable Documentation” shall have the meaning ascribed to it inSection 6.10 hereof.

“Response” shall mean a written response containing the information provided for inSection 8.3(b).

“Retained Asset” shall have the meaning ascribed to it inSection 6.14(c) hereof.

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“Security Interest” shall mean any mortgage, pledge, security interest, encumbrance, charge or other lien (whether arising by contract or by operation of law), other than (a) mechanic’s, materialmen’s, and similar liens arising in the ordinary course of business and securing obligations that are not yet due and payable, (b) liens arising under worker’s compensation, unemployment insurance, social security, retirement, and similar legislation, (c) liens for Taxes and assessments not yet due and payable, (d) liens for Taxes, assessments and other charges, if any, the validity of which is being contested in good faith and (e) minor imperfections of title, none of which is material in amount or materially affects the present use of such assets or properties.

“Seller” or “Sellers” shall have the meaning ascribed to it in the first paragraph of this Agreement.

“Seller Indemnitees” shall have the meaning ascribed to it inSection 8.2 hereof.

“Seller Material Adverse Effect” shall mean any material adverse change, event, circumstance or development with respect to, or material adverse effect on, (a) the business, assets, liabilities, capitalization, condition of the Purchased Assets (financial or otherwise), or results of operations of Sellers as such relate to the Purchased Assets, or (b) on the ability of Sellers to consummate the Closing and the transactions contemplated by this Agreement in accordance with the terms of this Agreement, excluding any effect of changes resulting from or relating to (i) to the extent that they do not have an ongoing materially disproportionate effect on Sellers, conditions in the United States or global economy or financial or capital markets generally, including changes in interest rates, (ii) to the extent that they do not have an ongoing materially disproportionate effect on Sellers, changes in conditions (including changes in legal, regulatory or business conditions) in or otherwise affecting the industries or businesses in which Sellers operate, (iii) changes in law, GAAP or any authoritative interpretations thereof, (iv) to the extent that they do not have an ongoing materially disproportionate effect on Sellers, acts of war, armed hostilities, sabotage or terrorism, or any escalation or worsening of any such acts of war, armed hostilities, sabotage or terrorism threatened or underway as of the date of this Agreement, (v) earthquakes, hurricanes, floods, rain, droughts or other natural acts, (vi) any action taken or omitted to be taken by Sellers at the written request or with the written consent of Buyer and (vii) any action taken by a Buyer Party. For the avoidance of doubt, the Parties agree that the terms “material”, “materially” or “materiality” as used in this Agreement with an initial lower case “m” shall have their respective customary and ordinary meanings, without regard to the meaning ascribed to Seller Material Adverse Effect.

“Seller Related Documents” shall have the meaning ascribed to it inSection 3.2(b) hereof.

“Sellers Certificate” shall mean certificates to the effect that each of the conditions specified inSection 7.2(a) through(d) (insofar as clause(d) relates to Legal Proceedings involving such Seller) is satisfied in all respects or is deemed waived as provided inSection 7.2.

“Sellers’ Dispute Notice” shall have the meaning ascribed to it inSection 1.10(d)(ii) hereof.

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“Tax Returns” shall mean all forms, reports, returns (including information returns), declarations, statements or other information (including any related or supporting schedules or attachments to any of the foregoing, and any amendments to any of the foregoing) supplied or required to be supplied to any Governmental Entity in connection with Taxes.

“Taxes” shall mean all taxes, charges, fees, levies or other similar assessments or liabilities, including income, capital gains, estimated, gross receipts, ad valorem, premium, value-added, excise, alternative minimum, real property, personal property, sales, use, transfer, escheat, withholding, employment, unemployment, insurance, social security, business license, business organization, environmental, workers compensation, payroll, profits, license, lease, service, service use, capital stock severance, stamp, occupation, windfall profits, customs, duties, franchise, withholding and other taxes imposed by the United States of America or any state, local or foreign government, or any agency thereof, or other political subdivision of the United States or any such government, and any interest, fines, penalties, assessments or additions to tax resulting from, attributable to or incurred in connection with any tax or any contest or dispute thereof.

“Tepee” shall have the meaning ascribed to it in the first paragraph of this Agreement.

“Third Party Claim” shall have the meaning ascribed to it inSection 8.3(a)(i) hereof.

“Title Defect” shall have the meaning ascribed to it inSection 6.6 hereof.

“Title Defect Notice” shall have the meaning ascribed to it inSection 6.8 hereof.

“Title Defect Threshold Amount” shall have the meaning ascribed to it inSection 6.12 hereof.

“Title Defect Value” shall have the meaning ascribed to it inSection 6.7 hereof.

“Transfer Requirement” means any consent, approval, authorization or permit of, or filing with or notification to, any Person which is required to be obtained, made or complied with for or in connection with any sale, assignment or transfer of any Asset or any interest therein; provided, however, that “Transfer Requirement” shall not include any consent of, notice to, filing with, or other action by any Governmental Entity in connection with the sale or conveyance of oil and/or gas leases or interests therein or Contracts or interests therein, if they are not required prior to the assignment of such oil and/or gas leases, Contracts or interests or they are customarily obtained subsequent to the sale or conveyance (including consents from state agencies).

“Treasury Regulations” and “Treasury Regulation” means the final and temporary (but not proposed) income tax regulations promulgated under the Code, as such regulations may be amended from time to time.

“Well” or “Wells” shall have the meaning ascribed to it inSection 1.1(b) hereof.

“Working Interest” means the percentage of costs and expenses attributable to the maintenance, development and operation of an Oil and Gas Interest.

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ARTICLE XI

MISCELLANEOUS

11.1Press Releases and Announcements. The initial press releases relating to this Agreement shall be press releases the text of which have been agreed to by Buyer and Sellers. Thereafter, neither Buyer nor any of the Sellers shall issue any press release or otherwise make any public statements with respect to this Agreement or any of the other transactions contemplated by this Agreement without the prior consent of the other Party (such consent not to be unreasonably withheld or delayed); provided that a Party may, without such consent (but after prior consultation to the extent practicable in the circumstances), issue such press releases and make such public statements that it believes are required by applicable law.

11.2No Third Party Beneficiaries. This Agreement shall not confer any rights or remedies upon any Person or entity other than the Parties and their respective successors and permitted assigns; provided, however, that the provisions ofArticle VIII concerning indemnification are intended for the benefit of the persons or entities entitled to indemnification thereunder.

11.3Like-Kind Exchanges. Sellers and Buyer consent to each of the other Parties’ assignment of its rights and obligations under this Agreement to its Qualified Intermediary (as that term is defined in Section 1.1031(k)-1(g)(4)(v) of the Treasury Regulations promulgated under the Code), if any, or to its Qualified Exchange Accommodation Titleholder (as that term is defined in Revenue Procedure 2000-37), if any, in connection with effectuation of a like-kind exchange. However, Sellers and Buyer acknowledge and agree that any assignment of this Agreement to a Qualified Intermediary or to a Qualified Exchange Accommodation Titleholder does not release Sellers or Buyer from any of their respective liabilities and obligations to each other under this Agreement. Each Party agrees to reasonably cooperate with the other to attempt to structure the transaction as a like-kind exchange.

11.4Entire Agreement. This Agreement (including the documents referred to herein) constitutes the entire agreement among the Parties and supersedes any prior understandings, agreements or representations by or among the Parties, written or oral, with respect to the subject matter hereof; provided that the Confidentiality Agreement shall remain in effect in accordance with its terms.

11.5Succession and Assignment. This Agreement shall be binding upon and inure to the benefit of the Parties named herein and their respective successors and permitted assigns. Except with respect to an acquirer of all or substantially all of a Party’s business or assets, no Party may assign any of its rights or delegate any of its performance obligations hereunder without the prior written approval of the other Parties; provided, however, Sellers approve the assignment of Buyer’s rights (but not the delegation of its performance obligation) to one or more of its wholly-owned subsidiaries. Any purported assignment of rights or delegation of performance obligations in violation of thisSection 11.5 is void.

11.6Counterparts and Facsimile Signature. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original but all of which together shall constitute one and the same instrument. This Agreement may be executed by facsimile signature.

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11.7Headings. The section headings contained in this Agreement are inserted for convenience only and shall not affect in any way the meaning or interpretation of this Agreement.

11.8Notices. All notices, requests, demands, claims, waivers and other communications required or permitted under this Agreement will be in writing and will be deemed to have been delivered (a) the next business day when sent overnight by a recognized courier service, (b) upon delivery when personally delivered to the recipient, or (c) when receipt is electronically confirmed, if sent by facsimile; provided, however, that if electronic receipt is confirmed after normal business hours of the recipient, notice shall be deemed to have been given on the next business day. All such notices and communications will be mailed, sent or delivered as set forth below or to such other person(s), facsimile number(s) or address(es) as the applicable recipient may have designated by written notice to the other signatories to this Agreement:

If to Sellers:

Alta Resources, L.L.C.

500 Dallas, Suite 2930

Houston, Texas 77002

Attn: Joseph G. Greenberg

Fax: (713) 759-1156

Tel: (713) 759-1155

and to:

Contango Gas Solutions, L.P.

3700 Buffalo Speedway, Suite 960

Houston, Texas 77098

Attn: Kenneth R. Peak

Fax: (713) 960-1065

Tel: (713) 960-1901

and to:

GPM Energy LLC

600 Travis, Suite 1850

Houston, Texas 77002

Attn: Barry E. Leavitt

Fax: (713) 377-5028

Tel: (713) 377-5026

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and to:

MND Partners, L.P.

600 Travis, Suite 1850

Houston, Texas 77002

Attn: Barry E. Leavitt

Fax: (713) 377-5028

Tel: (713) 377-5026

and to:

Tepee Petroleum Company, Inc.

500 Dallas, Suite 2920

Houston, Texas 77002

Attn: Townes G. Pressler

Fax: (713) 659-8300

Tel: (713) 659-6909

Copy to (which shall not constitute notice):

Morgan, Lewis & Bockius LLP

300 South Grand Avenue, Suite 2200

Los Angeles, CA 90071

Attn: Richard A. Shortz, Esq.

Phone: (213) 612-2500

Fax: (213) 612-2501

If to Buyer:

Petrohawk Energy Corporation

1000 Louisiana, Suite 5810

Houston, Texas 77002

Attn: David S. Elkouri, Esq.

Tel: (832) 204-2772

Fax: (832) 204-2872

Copy to (which shall not constitute notice):

Hinkle Elkouri Law Firm L.L.C.

301 N. Main, Suite 2000

Wichita, KS 67202

Attn: Connie D. Tatum, Esq.

Tel: (316) 660-6117

Fax: (316) 660-6017

45 Strictly Confidential

11.9Governing Law. All matters arising out of or relating to this Agreement and the transactions contemplated hereby (including without limitation its interpretation, construction, performance and enforcement) shall be governed by and construed in accordance with the internal laws of the State of Texas without giving effect to any choice or conflict of law provision or rule (whether of the State of Texas or any other jurisdiction) that would cause the application of laws of any jurisdictions other than those of the State of Texas.

11.10Amendments and Waivers. The Parties may mutually amend any provision of this Agreement at any time prior to the Closing. No amendment of any provision of this Agreement shall be valid unless the same shall be in writing and signed by all of the Parties. No waiver of any right or remedy hereunder shall be valid unless the same shall be in writing and signed by the Party giving such waiver. No waiver by any Party with respect to any default, misrepresentation or breach of warranty or covenant hereunder shall be valid unless the same shall be in writing and signed by the Party making such waiver nor shall such waiver be deemed to extend to any prior or subsequent default, misrepresentation or breach of warranty or covenant hereunder or affect in any way any rights arising by virtue of any prior or subsequent such occurrence.

11.11Severability. Any term or provision of this Agreement that is invalid or unenforceable in any situation in any jurisdiction shall not affect the validity or enforceability of the remaining terms and provisions hereof or the validity or enforceability of the offending term or provision in any other situation or in any other jurisdiction. If the final judgment of a court of competent jurisdiction declares that any term or provision hereof is invalid or unenforceable, the Parties agree that the court making the determination of invalidity or unenforceability shall have the power to limit the term or provision, to delete specific words or phrases, or to replace any invalid or unenforceable term or provision with a term or provision that is valid and enforceable and that comes closest to expressing the intention of the invalid or unenforceable term or provision, and this Agreement shall be enforceable as so modified.

11.12Submission to Jurisdiction. Each Party (a) submits to the jurisdiction of any state or federal court sitting in Houston, Texas in any action or proceeding arising out of or relating to this Agreement (including any action or proceeding for the enforcement of any arbitral award made in connection with any arbitration of a Dispute hereunder), (b) agrees that all claims in respect of such action or proceeding may be heard and determined in any such court, (c) waives any claim of inconvenient forum or other challenge to venue in such court, (d) agrees not to bring any action or proceeding arising out of or relating to this Agreement in any other court and (e) waives any right it may have to a trial by jury with respect to any action or proceeding arising out of or relating to this Agreement; provided in each case that, solely with respect to any arbitration of a Dispute, the Arbitrator shall resolve all threshold issues relating to the validity and applicability of the arbitration provisions of this Agreement, contract validity, applicability of statutes of limitations and issue preclusion, and such threshold issues shall not be heard or determined by such court. Each Party agrees to accept service of any summons, complaint or other initial pleading made in the manner provided for the giving of notices inSection 11.8, provided that nothing in thisSection 11.12 shall affect the right of any Party to serve such summons, complaint or other initial pleading in any other manner permitted by law.

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11.13Construction.

(a) The language used in this Agreement shall be deemed to be the language chosen by the Parties to express their mutual intent, and no rule of strict construction shall be applied against any Party.

(b) Any reference to any federal, state, local or foreign statute or law shall be deemed also to refer to all rules and regulations promulgated thereunder, unless the context requires otherwise.

(c) Any reference herein to “including” shall be interpreted as “including without limitation.”

(d) Any reference to any Article, Section or paragraph shall be deemed to refer to an Article, Section or paragraph of this Agreement, unless the context clearly indicates otherwise.

(e) The Parties have participated jointly in the negotiation and drafting of this Agreement. In the event an ambiguity or question of intent or interpretation arises, this Agreement shall be construed as if drafted jointly by the Parties and no presumption or burden of proof shall arise favoring or disfavoring any Party by virtue of the authorship of any of the provisions of this Agreement.

(REMAINDER OF PAGE INTENTIONALLY LEFT BLANK)

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IN WITNESS WHEREOF, the Parties have executed this Agreement as of the date first above written.

PETROHAWK ENERGY CORPORATION
By:	/s/ STEVE W. HEROD
Name:	Steve W. Herod
Title:	Executive Vice President – Corporate Development
CONTANGO GAS SOLUTIONS, L.P.
By:	/s/ KENNETH R. PEAK
Name:	Kenneth R. Peak
Title:	Chairman and President
ALTA RESOURCES, L.L.C.
By:	/s/ JOSEPH G. GREENBERG
Name:	Joseph G. Greenberg
Title:	President
GPM ENERGY LLC
By:	/s/ BARRY E. LEAVITT
Name:	Barry E. Leavitt
Title:	Vice President and Authorized Agent
MND PARTNERS, L.P.
By:	/s/ BARRY E. LEAVITT
Name:	Barry E. Leavitt
Title:	Vice President and Authorized Agent
TEPEE PETROLEUM COMPANY, INC.
By:	/s/ TOWNES G. PRESSLER
Name:	Townes G. Pressler
Title:	President

Signature Page to Asset Purchase Agreement

Strictly Confidential