<PAGE>
                                                                    Exhibit 10.1

                                                                  EXECUTION COPY

                              AMENDED AND RESTATED
                        SENIOR REVOLVING CREDIT AGREEMENT

                                   DATED AS OF
                                  JULY 28, 2005

                                      AMONG

                          PETROHAWK ENERGY CORPORATION,
                                  AS BORROWER,

                                  BNP PARIBAS,
                            AS ADMINISTRATIVE AGENT,

                             BANK OF AMERICA, N.A.,
                              AS SYNDICATION AGENT,

                          JPMORGAN CHASE BANK, N.A. AND
                             WELLS FARGO BANK, N.A.
                           AS CO-DOCUMENTATION AGENTS,

                                       AND

                            THE LENDERS PARTY HERETO

                        LEAD ARRANGER AND SOLE BOOKRUNNER

                                   BNP PARIBAS

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                            PAGE
                                                                                            ----
<S>             <C>                                                                         <C>
                                    ARTICLE I
                       DEFINITIONS AND ACCOUNTING MATTERS

SECTION 1.01    TERMS DEFINED ABOVE......................................................     1
SECTION 1.02    CERTAIN DEFINED TERMS....................................................     1
SECTION 1.03    TYPES OF LOANS AND BORROWINGS............................................    21
SECTION 1.04    TERMS GENERALLY; RULES OF CONSTRUCTION...................................    21
SECTION 1.05    ACCOUNTING TERMS AND DETERMINATIONS; GAAP................................    22

                                   ARTICLE II
                                   THE CREDITS

SECTION 2.01    COMMITMENTS..............................................................    22
SECTION 2.02    LOANS AND BORROWINGS.....................................................    23
SECTION 2.03    REQUESTS FOR BORROWINGS..................................................    24
SECTION 2.04    INTEREST ELECTIONS.......................................................    25
SECTION 2.05    FUNDING OF BORROWINGS....................................................    26
SECTION 2.06    TERMINATION AND REDUCTION OF AGGREGATE MAXIMUM CREDIT AMOUNTS............    27
SECTION 2.07    BORROWING BASE...........................................................    28
SECTION 2.08    LETTERS OF CREDIT........................................................    30

                                   ARTICLE III
              PAYMENTS OF PRINCIPAL AND INTEREST; PREPAYMENTS; FEES

SECTION 3.01    REPAYMENT OF LOANS.......................................................    35
SECTION 3.02    INTEREST.................................................................    35
SECTION 3.03    ALTERNATE RATE OF INTEREST...............................................    35
SECTION 3.04    PREPAYMENTS..............................................................    36
SECTION 3.05    FEES.....................................................................    37

                                   ARTICLE IV
                PAYMENTS; PRO RATA TREATMENT; SHARING OF SET-OFFS

SECTION 4.01    PAYMENTS GENERALLY; PRO RATA TREATMENT; SHARING OF SET-OFFS..............    38
SECTION 4.02    PRESUMPTION OF PAYMENT BY THE BORROWER...................................    39
SECTION 4.03    CERTAIN DEDUCTIONS BY THE ADMINISTRATIVE AGENT...........................    40
SECTION 4.04    DISPOSITION OF PROCEEDS..................................................    40

                                    ARTICLE V
           INCREASED COSTS; BREAK FUNDING PAYMENTS; TAXES; ILLEGALITY

SECTION 5.01    INCREASED COSTS..........................................................    40
SECTION 5.02    BREAK FUNDING PAYMENTS...................................................    41
SECTION 5.03    TAXES....................................................................    42
SECTION 5.04    MITIGATION OBLIGATIONS; REPLACEMENT OF LENDERS...........................    43
SECTION 5.05    ILLEGALITY...............................................................    43
</TABLE>


                                       i

<PAGE>

<TABLE>
<S>             <C>                                                                         <C>
                                   ARTICLE VI
                              CONDITIONS PRECEDENT

SECTION 6.01    EFFECTIVE DATE...........................................................    44
SECTION 6.02    EACH CREDIT EVENT........................................................    47

                                   ARTICLE VII
                         REPRESENTATIONS AND WARRANTIES

SECTION 7.01    ORGANIZATION; POWERS.....................................................    48
SECTION 7.02    AUTHORITY; ENFORCEABILITY................................................    48
SECTION 7.03    APPROVALS; NO CONFLICTS..................................................    48
SECTION 7.04    FINANCIAL CONDITION; NO MATERIAL ADVERSE CHANGE..........................    49
SECTION 7.05    LITIGATION...............................................................    49
SECTION 7.06    ENVIRONMENTAL MATTERS....................................................    50
SECTION 7.07    COMPLIANCE WITH THE LAWS AND AGREEMENTS; NO DEFAULTS.....................    51
SECTION 7.08    INVESTMENT COMPANY ACT...................................................    51
SECTION 7.09    PUBLIC UTILITY HOLDING COMPANY ACT.......................................    51
SECTION 7.10    TAXES....................................................................    51
SECTION 7.11    ERISA....................................................................    52
SECTION 7.12    DISCLOSURE; NO MATERIAL MISSTATEMENTS....................................    53
SECTION 7.13    INSURANCE................................................................    53
SECTION 7.14    RESTRICTION ON LIENS.....................................................    53
SECTION 7.15    SUBSIDIARIES.............................................................    54
SECTION 7.16    LOCATION OF BUSINESS AND OFFICES.........................................    54
SECTION 7.17    PROPERTIES; TITLES, ETC..................................................    54
SECTION 7.18    MAINTENANCE OF PROPERTIES................................................    55
SECTION 7.19    GAS IMBALANCES, PREPAYMENTS..............................................    55
SECTION 7.20    MARKETING OF PRODUCTION..................................................    56
SECTION 7.21    SWAP AGREEMENTS..........................................................    56
SECTION 7.22    USE OF LOANS AND LETTERS OF CREDIT.......................................    56
SECTION 7.23    SOLVENCY.................................................................    56
SECTION 7.24    SPECIFIED SENIOR INDEBTEDNESS............................................    57
SECTION 7.25    MERGERS..................................................................    57

                                  ARTICLE VIII
                              AFFIRMATIVE COVENANTS

SECTION 8.01    FINANCIAL STATEMENTS; RATINGS CHANGE; OTHER INFORMATION..................    57
SECTION 8.02    NOTICES OF MATERIAL EVENTS...............................................    60
SECTION 8.03    EXISTENCE; CONDUCT OF BUSINESS...........................................    60
SECTION 8.04    PAYMENT OF OBLIGATIONS...................................................    61
SECTION 8.05    PERFORMANCE OF OBLIGATIONS UNDER LOAN DOCUMENTS..........................    61
SECTION 8.06    OPERATION AND MAINTENANCE OF PROPERTIES..................................    61
SECTION 8.07    INSURANCE................................................................    62
SECTION 8.08    BOOKS AND RECORDS; INSPECTION RIGHTS.....................................    62
SECTION 8.09    COMPLIANCE WITH LAWS.....................................................    62
SECTION 8.10    ENVIRONMENTAL MATTERS....................................................    62
SECTION 8.11    FURTHER ASSURANCES.......................................................    63
</TABLE>


                                       ii

<PAGE>

<TABLE>
<S>             <C>                                                                         <C>
SECTION 8.12    RESERVE REPORTS..........................................................    64
SECTION 8.13    TITLE INFORMATION........................................................    65
SECTION 8.14    ADDITIONAL COLLATERAL; ADDITIONAL GUARANTORS.............................    66
SECTION 8.15    ERISA COMPLIANCE.........................................................    67
SECTION 8.16    SWAP AGREEMENTS..........................................................    67
SECTION 8.17    UNRESTRICTED SUBSIDIARIES................................................    67
SECTION 8.18    MARKETING ACTIVITIES.....................................................    68

                                   ARTICLE IX
                               NEGATIVE COVENANTS

SECTION 9.01    FINANCIAL COVENANTS......................................................    68
SECTION 9.02    DEBT.....................................................................    68
SECTION 9.03    LIENS....................................................................    69
SECTION 9.04    DIVIDENDS, DISTRIBUTIONS AND REDEMPTIONS; REPAYMENT OF SENIOR
                UNSECURED NOTES AND SECOND LIEN TERM LOAN AGREEMENT......................    70
SECTION 9.05    INVESTMENTS, LOANS AND ADVANCES..........................................    71
SECTION 9.06    DESIGNATION AND CONVERSION OF RESTRICTED AND UNRESTRICTED SUBSIDIARIES;
                DEBT OF UNRESTRICTED SUBSIDIARIES........................................    72
SECTION 9.07    NATURE OF BUSINESS; INTERNATIONAL OPERATIONS.............................    73
SECTION 9.08    LIMITATION ON LEASES.....................................................    73
SECTION 9.09    PROCEEDS OF NOTES........................................................    73
SECTION 9.10    ERISA COMPLIANCE.........................................................    74
SECTION 9.11    SALE OR DISCOUNT OF RECEIVABLES..........................................    75
SECTION 9.12    MERGERS, ETC.............................................................    75
SECTION 9.13    SALE OF PROPERTIES.......................................................    75
SECTION 9.14    ENVIRONMENTAL MATTERS....................................................    76
SECTION 9.15    TRANSACTIONS WITH AFFILIATES.............................................    76
SECTION 9.16    SUBSIDIARIES.............................................................    76
SECTION 9.17    NEGATIVE PLEDGE AGREEMENTS; DIVIDEND RESTRICTIONS........................    76
SECTION 9.18    GAS IMBALANCES, TAKE-OR-PAY OR OTHER PREPAYMENTS.........................    77
SECTION 9.19    SWAP AGREEMENTS..........................................................    77
SECTION 9.20    MERGER DOCUMENTS.........................................................    77

                                    ARTICLE X
                           EVENTS OF DEFAULT; REMEDIES

SECTION 10.01   EVENTS OF DEFAULT........................................................    78
SECTION 10.02   REMEDIES.................................................................    80

                                   ARTICLE XI
                                   THE AGENTS

SECTION 11.02   DUTIES AND OBLIGATIONS OF ADMINISTRATIVE AGENT...........................    81
SECTION 11.03   ACTION BY ADMINISTRATIVE AGENT...........................................    81
SECTION 11.04   RELIANCE BY ADMINISTRATIVE AGENT.........................................    82
SECTION 11.05   SUBAGENTS................................................................    82
SECTION 11.06   RESIGNATION OR REMOVAL OF AGENTS.........................................    82
SECTION 11.07   AGENTS AS LENDERS........................................................    83
SECTION 11.08   NO RELIANCE..............................................................    83
</TABLE>


                                      iii

<PAGE>

<TABLE>
<S>             <C>                                                                         <C>
SECTION 11.09   AUTHORITY OF ADMINISTRATIVE AGENT TO RELEASE COLLATERAL AND LIENS........    84
SECTION 11.10   THE ARRANGER, THE SYNDICATION AGENT AND THE CO-DOCUMENTATION AGENTS......    84

                                   ARTICLE XII
                                  MISCELLANEOUS

SECTION 12.01   NOTICES..................................................................    84
SECTION 12.02   WAIVERS; AMENDMENTS......................................................    85
SECTION 12.03   EXPENSES, INDEMNITY; DAMAGE WAIVER.......................................    86
SECTION 12.04   SUCCESSORS AND ASSIGNS...................................................    88
SECTION 12.05   SURVIVAL; REVIVAL; REINSTATEMENT.........................................    91
SECTION 12.06   COUNTERPARTS; INTEGRATION; EFFECTIVENESS.................................    92
SECTION 12.07   SEVERABILITY.............................................................    92
SECTION 12.08   RIGHT OF SETOFF..........................................................    92
SECTION 12.09   GOVERNING LAW; JURISDICTION; CONSENT TO SERVICE OF PROCESS...............    93
SECTION 12.10   HEADINGS.................................................................    94
SECTION 12.11   CONFIDENTIALITY..........................................................    94
SECTION 12.12   INTEREST RATE LIMITATION.................................................    95
SECTION 12.13   EXCULPATION PROVISIONS...................................................    96
SECTION 12.14   SPECIFIED SENIOR INDEBTEDNESS............................................    96
SECTION 12.15   COLLATERAL MATTERS; SWAP AGREEMENTS......................................    96
SECTION 12.16   NO THIRD PARTY BENEFICIARIES.............................................    96
SECTION 12.17   USA PATRIOT ACT NOTICE...................................................    97
</TABLE>


                                       iv

<PAGE>

                         ANNEXES, EXHIBITS AND SCHEDULES

Annex I         List of Maximum Credit Amounts

Exhibit A       Form of Note
Exhibit B       Form of Borrowing Request
Exhibit C       Form of Interest Election Request
Exhibit D       Form of Compliance Certificate
Exhibit E-1     Form of Legal Opinion of Hinkle Elkouri Law Firm L.L.C.,
                special counsel to the Borrower
Exhibit E-2     Form of Legal Opinion of Local Counsel
Exhibit F-1     Security Instruments
Exhibit F-2     Form of Guaranty and Collateral Agreement
Exhibit G       Form of Assignment and Assumption

Schedule 7.05   Litigation
Schedule 7.15   Subsidiaries and Partnerships; Unrestricted Subsidiaries
Schedule 7.19   Gas Imbalances
Schedule 7.20   Marketing Contracts
Schedule 7.21   Swap Agreements
Schedule 9.05   Investments


                                       v

<PAGE>

     THIS AMENDED AND RESTATED SENIOR REVOLVING CREDIT AGREEMENT dated as of
July 28, 2005, is among: Petrohawk Energy Corporation, a corporation duly formed
and existing under the laws of the State of Delaware (the "Borrower"); each of
the Lenders from time to time party hereto; BNP Paribas (in its individual
capacity, "BNP Paribas"), as administrative agent for the Lenders (in such
capacity, together with its successors in such capacity, the "Administrative
Agent"); Bank of America, N.A., as syndication agent for the Lenders (in such
capacity, together with its successors in such capacity, the "Syndication
Agent"); and JPMorgan Chase Bank, N.A. and Wells Fargo Bank, N.A. as
co-documentation agents for the Lenders (in such capacity, together with its
successors in such capacity, the "Co-Documentation Agents").

                                    RECITALS

     A. The Borrower, the Administrative Agent and Lenders named and defined
therein as lenders and agents, are parties to that certain Senior Revolving
Credit Agreement dated as of November 23, 2004, pursuant to which such lenders
and agents provided certain loans and extensions of credit to the Borrower (as
renewed, extended, amended or restated from time to time, the "Existing Credit
Agreement").

     B. The Borrower has requested the Lenders, and the Lenders have agreed, to
amend and restate the Existing Credit Agreement subject to the terms and
conditions of this Agreement.

     C. In consideration of the mutual covenants and agreements herein contained
and of the loans, extensions of credit and commitments hereinafter referred to,
the parties hereto agree as follows:

                                   ARTICLE I
                       DEFINITIONS AND ACCOUNTING MATTERS

     Section 1.01 Terms Defined Above. As used in this Agreement, each term
defined above has the meaning indicated above.

     Section 1.02 Certain Defined Terms. As used in this Agreement, the
following terms have the meanings specified below:

     "ABR", when used in reference to any Loan or Borrowing, refers to whether
such Loan, or the Loans comprising such Borrowing, are bearing interest at a
rate determined by reference to the Alternate Base Rate.

     "Adjusted LIBO Rate" means, with respect to any Eurodollar Borrowing for
any Interest Period, an interest rate per annum (rounded upwards, if necessary,
to the next 1/16 of 1%) equal to (a) the LIBO Rate for such Interest Period
multiplied by (b) the Statutory Reserve Rate.

     "Administrative Questionnaire" means an Administrative Questionnaire in a
form supplied by the Administrative Agent.

     "Affected Loans" has the meaning assigned such term in Section 5.05.

<PAGE>

     "Affiliate" means, with respect to a specified Person, another Person that
directly, or indirectly through one or more intermediaries, Controls or is
Controlled by or is under common Control with the Person specified.

     "Agents" means, collectively, the Administrative Agent, the Syndication
Agent and the Co-Documentation Agents; and "Agent" shall mean either the
Administrative Agent, the Syndication Agent or any Co-Documentation Agent, as
the context requires.

     "Aggregate Maximum Credit Amounts" at any time shall equal the sum of the
Maximum Credit Amounts, as the same may be reduced or terminated pursuant to
Section 2.06.

     "Agreement" means this Amended and Restated Senior Revolving Credit
Agreement, as the same may from time to time be amended, modified, supplemented
or restated.

     "Alternate Base Rate" means, for any day, a rate per annum equal to the
greater of (a) the Prime Rate in effect on such day and (b) the Federal Funds
Effective Rate in effect on such day plus 1/2 of 1%. Any change in the Alternate
Base Rate due to a change in the Prime Rate or the Federal Funds Effective Rate
shall be effective from and including the effective date of such change in the
Prime Rate or the Federal Funds Effective Rate, respectively.

     "Applicable Margin" means, for any day, with respect to any ABR Loan or
Eurodollar Loan, or with respect to the Commitment Fee Rate, as the case may be,
the rate per annum set forth in the Borrowing Base Utilization Grid below based
upon the Borrowing Base Utilization Percentage then in effect:

                        BORROWING BASE UTILIZATION GRID

<TABLE>
<CAPTION>
Borrowing Base
Utilization               Greater than or     Greater than or    Greater than or
Percentage        <50%   equal to 50% <75%   equal to 75% <90%    equal to 90%
--------------   -----   -----------------   -----------------   ---------------
<S>              <C>     <C>                 <C>                 <C>
LIBOR Margin     1.250%        1.500%              1.750%             2.000%
ABR Margin       0.000%        0.000%              0.250%             0.500%
Commitment Fee
   Rate          0.250%        0.375%              0.375%             0.500%
</TABLE>

     Each change in the Applicable Margin shall apply during the period
commencing on the effective date of such change and ending on the date
immediately preceding the effective date of the next such change, provided,
however, that if at any time the Borrower fails to deliver a Reserve Report
pursuant to Section 8.12(a), then the "Applicable Margin" means the rate per
annum set forth on the grid when the Borrowing Base Utilization Percentage is at
its highest level.

     "Applicable Percentage" means, with respect to any Lender, the percentage
of the Aggregate Maximum Credit Amounts represented by such Lender's Maximum
Credit Amount as such percentage is set forth on Annex I.


                                       2

<PAGE>

     "Approved Counterparty" means (a) any Lender or any Affiliate of a Lender
or (b) any other Person whose long term senior unsecured debt rating is A/A2 by
S&P or Moody's (or their equivalent) or higher.

     "Approved Fund" means any Person (other than a natural person) that is
engaged in making, purchasing, holding or investing in bank loans and similar
extensions of credit in the ordinary course of its business and that is
administered or managed by (a) a Lender, (b) an Affiliate of a Lender or (c) an
entity or an Affiliate of an entity that administers or manages a Lender.

     "Approved Petroleum Engineers" means Netherland, Sewell & Associates, Inc.
and any other independent petroleum engineers reasonably acceptable to the
Administrative Agent.

     "Arranger" means BNP Paribas, in its capacity as the lead arranger and sole
bookrunner hereunder.

     "Assignment and Assumption" means an assignment and assumption entered into
by a Lender and an assignee (with the consent of any party whose consent is
required by Section 12.04(b)), and accepted by the Administrative Agent, in the
form of Exhibit G or any other form approved by the Administrative Agent.

     "Availability Period" means the period from and including the Effective
Date to but excluding the Termination Date.

     "Board" means the Board of Governors of the Federal Reserve System of the
United States of America or any successor Governmental Authority.

     "Borrowing" means Loans of the same Type, made, converted or continued on
the same date and, in the case of Eurodollar Loans, as to which a single
Interest Period is in effect.

     "Borrowing Base" means at any time an amount equal to the amount determined
in accordance with Section 2.07 and Section 6.01(q), as the same may be adjusted
from time to time pursuant to Section 8.13(c) or Section 9.13(e).

     "Borrowing Base Utilization Percentage" means, as of any day, the fraction
expressed as a percentage, the numerator of which is the sum of the Revolving
Credit Exposures of the Lenders on such day, and the denominator of which is the
Borrowing Base in effect on such day.

     "Borrowing Request" means a request by the Borrower for a Borrowing in
accordance with Section 2.03.

     "Business Day" means any day that is not a Saturday, Sunday or other day on
which commercial banks in New York City or Houston, Texas are authorized or
required by law to remain closed; and if such day relates to a Borrowing or
continuation of, a payment or prepayment of principal of or interest on, or a
conversion of or into, or the Interest Period for, a Eurodollar Loan or a notice
by the Borrower with respect to any such Borrowing or continuation, payment,
prepayment, conversion or Interest Period, any day which is also a day on which
dealings in dollar deposits are carried out in the London interbank market.


                                       3

<PAGE>

     "Capital Leases" means, in respect of any Person, all leases which shall
have been, or should have been, in accordance with GAAP, recorded as capital
leases on the balance sheet of the Person liable (whether contingent or
otherwise) for the payment of rent thereunder.

     "Cash Equivalent" means cash held in US dollars and all Investments of the
type identified in Section 9.05(c).

     "Casualty Event" means any loss, casualty or other insured damage to, or
any nationalization, taking under power of eminent domain or by condemnation or
similar proceeding of, any Property of the Borrower or any of its Restricted
Subsidiaries having a fair market value in excess of $500,000.

     "Change in Control" means (a) the acquisition of ownership, directly or
indirectly, beneficially or of record, by any Person or group (within the
meaning of the Securities Exchange Act of 1934 and the rules of the SEC
thereunder as in effect on the date hereof) other than the Permitted Holders, of
Equity Interests representing more than 35% of the aggregate ordinary voting
power represented by the issued and outstanding Equity Interests of the
Borrower, (b) occupation of a majority of the seats (other than vacant seats) on
the board of directors of the Borrower by Persons who were neither (i) nominated
by the board of directors of the Borrower nor (ii) appointed by directors so
nominated or (c) the acquisition of direct or indirect Control of the Borrower
by any Person or group other than the Permitted Holders.

     "Change in Law" means (a) the adoption of any law, rule or regulation after
the date of this Agreement, (b) any change in any law, rule or regulation or in
the interpretation or application thereof by any Governmental Authority after
the date of this Agreement or (c) compliance by any Lender or the Issuing Bank
(or, for purposes of Section 5.01(b)), by any lending office of such Lender or
by such Lender's or the Issuing Bank's holding company, if any) with any
request, guideline or directive (whether or not having the force of law) of any
Governmental Authority made or issued after the date of this Agreement.

     "Code" means the Internal Revenue Code of 1986, as amended from time to
time, and any successor statute.

     "Commitment" means, with respect to each Lender, the commitment of such
Lender to make Loans and to acquire participations in Letters of Credit
hereunder, expressed as an amount representing the maximum aggregate amount of
such Lender's Revolving Credit Exposure hereunder, as such commitment may be (a)
modified from time to time pursuant to Section 2.06 and (b) modified from time
to time pursuant to assignments by or to such Lender pursuant to Section
12.04(b). The amount representing each Lender's Commitment shall at any time be
the lesser of such Lender's Maximum Credit Amount and such Lender's Applicable
Percentage of the then effective Borrowing Base.

     "Commitment Fee Rate" has the meaning set forth in the definition of
"Applicable Margin".

     "Consolidated Net Income" means with respect to the Borrower and the
Consolidated Restricted Subsidiaries, for any period, the aggregate of the net
income (or loss) of the Borrower and the Consolidated Restricted Subsidiaries
after allowances for taxes for such period


                                       4

<PAGE>

determined on a consolidated basis in accordance with GAAP; provided that there
shall be excluded from such net income (to the extent otherwise included
therein) the following: (a) the net income of any Person in which the Borrower
or any Consolidated Restricted Subsidiary has an interest (which interest does
not cause the net income of such other Person to be consolidated with the net
income of the Borrower and the Consolidated Restricted Subsidiaries in
accordance with GAAP), except to the extent of the amount of dividends or
distributions actually paid in cash during such period by such other Person to
the Borrower or to a Consolidated Restricted Subsidiary, as the case may be; (b)
the net income (but not loss) during such period of any Consolidated Restricted
Subsidiary to the extent that the declaration or payment of dividends or similar
distributions or transfers or loans by that Consolidated Restricted Subsidiary
is not at the time permitted by operation of the terms of its charter or any
agreement, instrument or Governmental Requirement applicable to such
Consolidated Restricted Subsidiary or is otherwise restricted or prohibited, in
each case determined in accordance with GAAP; (c) any extraordinary non-cash
gains or losses during such period and (d) any gains or losses attributable to
writeups or writedowns of assets, including ceiling test writedowns; and
provided further that if the Borrower or any Consolidated Restricted Subsidiary
shall acquire or dispose of any Property during such period or a Subsidiary
shall be redesignated as either an Unrestricted Subsidiary or a Restricted
Subsidiary, then Consolidated Net Income shall be calculated after giving pro
forma effect to such acquisition, merger, disposition or redesignation, as if
such acquisition, merger, disposition or redesignation had occurred on the first
day of such period.

     "Consolidated Restricted Subsidiaries" means any Restricted Subsidiaries
that are Consolidated Subsidiaries.

     "Consolidated Subsidiaries" means each Subsidiary of the Borrower (whether
now existing or hereafter created or acquired) the financial statements of which
shall be (or should have been) consolidated with the financial statements of the
Borrower in accordance with GAAP.

     "Consolidated Unrestricted Subsidiaries" means any Unrestricted
Subsidiaries that are Consolidated Subsidiaries.

     "Control" means the possession, directly or indirectly, of the power to
direct or cause the direction of the management or policies of a Person, whether
through the ability to exercise voting power, by contract or otherwise. For the
purposes of this definition, and without limiting the generality of the
foregoing, any Person that owns directly or indirectly 10% or more of the Equity
Interests having ordinary voting power for the election of the directors or
other governing body of a Person (other than as a limited partner of such other
Person) will be deemed to "control" such other Person. "Controlling" and
"Controlled" have meanings correlative thereto.

     "Debt" means, for any Person, the sum of the following (without
duplication): (a) all obligations of such Person for borrowed money or evidenced
by bonds, bankers' acceptances, debentures, notes or other similar instruments;
(b) all obligations of such Person (whether contingent or otherwise) in respect
of letters of credit, surety or other bonds and similar instruments; (c) all
accounts payable and all accrued expenses, liabilities or other obligations of
such Person to pay the deferred purchase price of Property or services; (d) all
obligations under Capital Leases; (e) all obligations under Synthetic Leases;
(f) all Debt (as defined in the other


                                       5

<PAGE>

clauses of this definition) of others secured by (or for which the holder of
such Debt has an existing right, contingent or otherwise, to be secured by) a
Lien on any Property of such Person, whether or not such Debt is assumed by such
Person; (g) all Debt (as defined in the other clauses of this definition) of
others guaranteed by such Person or in which such Person otherwise assures a
creditor against loss of the Debt (howsoever such assurance shall be made) to
the extent of the lesser of the amount of such Debt and the maximum stated
amount of such guarantee or assurance against loss; (h) all obligations or
undertakings of such Person to maintain or cause to be maintained the financial
position or covenants of others or to purchase the Debt or Property of others;
(i) obligations to deliver commodities, goods or services, including, without
limitation, Hydrocarbons, in consideration of one or more advance payments,
other than gas balancing arrangements in the ordinary course of business; (j)
obligations to pay for goods or services whether or not such goods or services
are actually received or utilized by such Person; (k) any Debt of a partnership
for which such Person is liable either by agreement, by operation of law or by a
Governmental Requirement but only to the extent of such liability; (l)
Disqualified Capital Stock; and (m) the undischarged balance of any production
payment created by such Person or for the creation of which such Person directly
or indirectly received payment. The Debt of any Person shall include all
obligations of such Person of the character described above to the extent such
Person remains legally liable in respect thereof notwithstanding that any such
obligation is not included as a liability of such Person under GAAP.

     "Default" means any event or condition which constitutes an Event of
Default or which upon notice, lapse of time or both would, unless cured or
waived, become an Event of Default.

     "Designated Preferred Stock" means the Borrower's Series A 8% Cumulative
Convertible Preferred Stock issued under certificate of designation dated June
29, 2001.

     "Disqualified Capital Stock" means any Equity Interest that, by its terms
(or by the terms of any security into which it is convertible or for which it is
exchangeable) or upon the happening of any event, matures or is mandatorily
redeemable for any consideration other than other Equity Interests (which would
not constitute Disqualified Capital Stock), pursuant to a sinking fund
obligation or otherwise, or is convertible or exchangeable for Debt or
redeemable for any consideration other than other Equity Interests (which would
not constitute Disqualified Capital Stock) at the option of the holder thereof,
in whole or in part, on or prior to the date that is one year after the earlier
of (a) the Maturity Date and (b) the date on which there are no Loans, LC
Exposure or other obligations hereunder outstanding and all of the Commitments
are terminated.

     "dollars" or "$" refers to lawful money of the United States of America.

     "Domestic Subsidiary" means any Restricted Subsidiary that is organized
under the laws of the United States of America or any state thereof or the
District of Columbia.

     "EBITDA" means, for any period, the sum of Consolidated Net Income for such
period plus the following expenses or charges to the extent deducted from
Consolidated Net Income in such period: interest, income taxes, depreciation,
depletion, amortization and other similar noncash charges, minus all noncash
income added to Consolidated Net Income.


                                       6

<PAGE>

     "Effective Date" means the date on which the conditions specified in
Section 6.01 are satisfied (or waived in accordance with Section 12.02).

     "Engineering Reports" has the meaning assigned such term in Section
2.07(c)(i).

     "Environmental Laws" means any and all Governmental Requirements pertaining
in any way to health, safety the environment or the preservation or reclamation
of natural resources, in effect in any and all jurisdictions in which the
Borrower or any Restricted Subsidiary is conducting or at any time has conducted
business, or where any Property of the Borrower or any Restricted Subsidiary is
located, including without limitation, the Oil Pollution Act of 1990 ("OPA"), as
amended, the Clean Air Act, as amended, the Comprehensive Environmental,
Response, Compensation, and Liability Act of 1980 ("CERCLA"), as amended, the
Federal Water Pollution Control Act, as amended, the Occupational Safety and
Health Act of 1970, as amended, the Resource Conservation and Recovery Act of
1976 ("RCRA"), as amended, the Safe Drinking Water Act, as amended, the Toxic
Substances Control Act, as amended, the Superfund Amendments and Reauthorization
Act of 1986, as amended, the Hazardous Materials Transportation Act, as amended,
and other environmental conservation or protection Governmental Requirements.
The term "oil" shall have the meaning specified in OPA, the terms "hazardous
substance" and "release" (or "threatened release") have the meanings specified
in CERCLA, the terms "solid waste" and "disposal" (or "disposed") have the
meanings specified in RCRA and the term "oil and gas waste" shall have the
meaning specified in Section 91.1011 of the Texas Natural Resources Code
("Section 91.1011"); provided, however, that (a) in the event either OPA,
CERCLA, RCRA or Section 91.1011 is amended so as to broaden the meaning of any
term defined thereby, such broader meaning shall apply subsequent to the
effective date of such amendment and (b) to the extent the laws of the state or
other jurisdiction in which any Property of the Borrower or any Restricted
Subsidiary is located establish a meaning for "oil," "hazardous substance,"
"release," "solid waste," "disposal" or "oil and gas waste" which is broader
than that specified in either OPA, CERCLA, RCRA or Section 91.1011, such broader
meaning shall apply.

     "Equity Interests" means shares of capital stock, partnership interests,
membership interests in a limited liability company, beneficial interests in a
trust or other equity ownership interests in a Person, and any warrants, options
or other rights entitling the holder thereof to purchase or acquire any such
Equity Interest.

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended, and any successor statute.

     "ERISA Affiliate" means each trade or business (whether or not
incorporated) which together with the Borrower or a Subsidiary would be deemed
to be a "single employer" within the meaning of section 4001(b)(1) of ERISA or
subsections (b), (c), (m) or (o) of section 414 of the Code.

     "ERISA Event" means (a) a "Reportable Event" described in section 4043 of
ERISA and the regulations issued thereunder, (b) the withdrawal of the Borrower,
a Subsidiary or any ERISA Affiliate from a Plan during a plan year in which it
was a "substantial employer" as defined in section 4001(a)(2) of ERISA, (c) the
filing of a notice of intent to terminate a Plan or


                                       7

<PAGE>

the treatment of a Plan amendment as a termination under section 4041 of ERISA,
(d) the institution of proceedings to terminate a Plan by the PBGC, (e) receipt
of a notice of withdrawal liability pursuant to Section 4202 of ERISA or (f) any
other event or condition which might constitute grounds under section 4042 of
ERISA for the termination of, or the appointment of a trustee to administer, any
Plan.

     "Eurodollar", when used in reference to any Loan or Borrowing, refers to
whether such Loan, or the Loans comprising such Borrowing, are bearing interest
at a rate determined by reference to the Adjusted LIBO Rate.

     "Event of Default" has the meaning assigned such term in Section 10.01.

     "Excepted Liens" means: (a) Liens for Taxes, assessments or other
governmental charges or levies which are not delinquent or which are being
contested in good faith by appropriate action and for which adequate reserves
have been maintained in accordance with GAAP; (b) Liens in connection with
workers' compensation, unemployment insurance or other social security, old age
pension or public liability obligations which are not delinquent or which are
being contested in good faith by appropriate action and for which adequate
reserves have been maintained in accordance with GAAP; (c) statutory landlord's
liens, operators', vendors', carriers', warehousemen's, repairmen's, mechanics',
suppliers', workers', materialmen's, construction or other like Liens arising by
operation of law in the ordinary course of business or incident to the
exploration, development, operation and maintenance of Oil and Gas Properties
each of which is in respect of obligations that are not delinquent or which are
being contested in good faith by appropriate action and for which adequate
reserves have been maintained in accordance with GAAP; (d) contractual Liens
which arise in the ordinary course of business under operating agreements, joint
venture agreements, oil and gas partnership agreements, oil and gas leases,
farm-out agreements, division orders, contracts for the sale, transportation or
exchange of oil and natural gas, unitization and pooling declarations and
agreements, area of mutual interest agreements, overriding royalty agreements,
marketing agreements, processing agreements, net profits agreements, development
agreements, gas balancing or deferred production agreements, injection,
repressuring and recycling agreements, salt water or other disposal agreements,
seismic or other geophysical permits or agreements, and other agreements which
are usual and customary in the oil and gas business and are for claims which are
not delinquent or which are being contested in good faith by appropriate action
and for which adequate reserves have been maintained in accordance with GAAP,
provided that any such Lien referred to in this clause does not materially
impair the use of the Property covered by such Lien for the purposes for which
such Property is held by the Borrower or any Restricted Subsidiary or materially
impair the value of such Property subject thereto; (e) Liens arising solely by
virtue of any statutory or common law provision relating to banker's liens,
rights of set-off or similar rights and remedies and burdening only deposit
accounts or other funds maintained with a creditor depository institution,
provided that no such deposit account is a dedicated cash collateral account or
is subject to restrictions against access by the depositor in excess of those
set forth by regulations promulgated by the Board and no such deposit account is
intended by Borrower or any of its Restricted Subsidiaries to provide collateral
to the depository institution; (f) easements, restrictions, servitudes, permits,
conditions, covenants, exceptions or reservations in any Property of the
Borrower or any Restricted Subsidiary for the purpose of roads, pipelines,
transmission lines, transportation lines, distribution lines for the removal of
gas, oil, coal or other


                                       8

<PAGE>

minerals or timber, and other like purposes, or for the joint or common use of
real estate, rights of way, facilities and equipment, that do not secure any
monetary obligations and which in the aggregate do not materially impair the use
of such Property for the purposes of which such Property is held by the Borrower
or any Restricted Subsidiary or materially impair the value of such Property
subject thereto; (g) Liens on cash or securities pledged to secure performance
of tenders, surety and appeal bonds, government contracts, performance and
return of money bonds, bids, trade contracts, leases, statutory obligations,
regulatory obligations and other obligations of a like nature incurred in the
ordinary course of business and (h) judgment and attachment Liens not giving
rise to an Event of Default, provided that any appropriate legal proceedings
which may have been duly initiated for the review of such judgment shall not
have been finally terminated or the period within which such proceeding may be
initiated shall not have expired and no action to enforce such Lien has been
commenced; provided, further that Liens described in clauses (a) through (e)
shall remain "Excepted Liens" only for so long as no action to enforce such Lien
has been commenced and no intention to subordinate the first priority Lien
granted in favor of the Administrative Agent and the Lenders is to be hereby
implied or expressed by the permitted existence of such Excepted Liens.

     "Excluded Taxes" means, with respect to the Administrative Agent, any
Lender, the Issuing Bank or any other recipient of any payment to be made by or
on account of any obligation of the Borrower or any Guarantor hereunder or under
any other Loan Document, (a) income or franchise taxes imposed on (or measured
by) its net income by the United States of America or such other jurisdiction
under the laws of which such recipient is organized or in which its principal
office is located or, in the case of any Lender, in which its applicable lending
office is located, (b) any branch profits taxes imposed by the United States of
America or any similar tax imposed by any other jurisdiction in which the
Borrower or any Guarantor is located and (c) in the case of a Foreign Lender
(other than an assignee pursuant to a request by the Borrower under Section
5.04(b)), any withholding tax that is imposed on amounts payable to such Foreign
Lender at the time such Foreign Lender becomes a party to this Agreement (or
designates a new lending office) or is attributable to such Foreign Lender's
failure to comply with Section 5.03(e), except to the extent that such Foreign
Lender (or its assignor, if any) was entitled, at the time of designation of a
new lending office (or assignment), to receive additional amounts with respect
to such withholding tax pursuant to Section 5.03 or Section 5.03(c).

     "Federal Funds Effective Rate" means, for any day, the weighted average
(rounded upwards, if necessary, to the next 1/100 of 1%) of the rates on
overnight Federal funds transactions with members of the Federal Reserve System
arranged by Federal funds brokers, as published on the next succeeding Business
Day by the Federal Reserve Bank of New York, or, if such rate is not so
published for any day that is a Business Day, the average (rounded upwards, if
necessary, to the next 1/100 of 1%) of the quotations for such day for such
transactions received by the Administrative Agent from three Federal funds
brokers of recognized standing selected by it.

     "Financial Officer" means, for any Person, the chief financial officer,
principal accounting officer, treasurer or controller of such Person. Unless
otherwise specified, all references herein to a Financial Officer means a
Financial Officer of the Borrower.


                                       9

<PAGE>

     "Financial Statements" means the financial statement or statements of the
Borrower and its Consolidated Subsidiaries referred to in Section 7.04(a).

     "Foreign Lender" means any Lender that is organized under the laws of a
jurisdiction other than that in which the Borrower is located. For purposes of
this definition, the United States of America, each State thereof and the
District of Columbia shall be deemed to constitute a single jurisdiction.

     "Foreign Subsidiary" means any Restricted Subsidiary that is not a Domestic
Subsidiary.

     "GAAP" means generally accepted accounting principles in the United States
of America as in effect from time to time subject to the terms and conditions
set forth in Section 1.05.

     "Gas Balancing Obligations" means those obligations set forth on Schedule
7.19.

     "Governmental Authority" means the government of the United States of
America, any other nation or any political subdivision thereof, whether state or
local, and any agency, authority, instrumentality, regulatory body, court,
central bank or other entity exercising executive, legislative, judicial,
taxing, regulatory or administrative powers or functions of or pertaining to
government over the Borrower, any Restricted Subsidiary, any of their
Properties, any Agent, the Issuing Bank or any Lender.

     "Governmental Requirement" means any law, statute, code, ordinance, order,
determination, rule, regulation, judgment, decree, injunction, franchise,
permit, certificate, license, authorization or other directive or requirement,
whether now or hereinafter in effect, including, without limitation,
Environmental Laws, energy regulations and occupational, safety and health
standards or controls, of any Governmental Authority.

     "Guarantors" means, collectively:

     (a) as of the Effective Date, each of the following:

          -    Petrohawk Operating Company, a Texas corporation;

          -    Beta Operating Company, L.L.C., an Oklahoma limited liability
               company;

          -    P-H Energy, LLC, a Texas limited liability company;

          -    Prohawk Oil & Gas Corporation, a Texas corporation;

          -    Red River Field Services, L.L.C., an Oklahoma limited liability
               company;

          -    TCM, L.L.C., an Oklahoma limited liability company;

          -    Petrohawk Properties, LP, a Texas limited partnership;

          -    Prohawk Operating, LLC, a Texas limited liability company;


                                       10

<PAGE>

          -    Petrohawk Holdings, LLC, a Delaware limited liability company;

          -    Black Hawk Oil Company, a Delaware corporation;

          -    Mission Holdings LLC, a Delaware limited liability company;

          -    Mission E&P Limited Partnership, a Texas limited partnership; and

     (b) each other Material Domestic Subsidiary or other Domestic Subsidiary
that guarantees the Indebtedness pursuant to Section 8.14(b).

     "Guaranty Agreement" means an agreement executed by the Guarantors in
substantially the form of Exhibit F-2 unconditionally guarantying on a joint and
several basis, payment of the Indebtedness, as the same may be amended, modified
or supplemented from time to time.

     "Highest Lawful Rate" means, with respect to each Lender, the maximum
nonusurious interest rate, if any, that at any time or from time to time may be
contracted for, taken, reserved, charged or received on the Loans or on other
Indebtedness under laws applicable to such Lender which are presently in effect
or, to the extent allowed by law, under such applicable laws which may hereafter
be in effect and which allow a higher maximum nonusurious interest rate than
applicable laws allow as of the date hereof.

     "Hydrocarbon Interests" means all rights, titles, interests and estates now
or hereafter acquired in and to oil and gas leases, oil, gas and mineral leases,
or other liquid or gaseous hydrocarbon leases, mineral fee interests, overriding
royalty and royalty interests, net profit interests and production payment
interests, including any reserved or residual interests of whatever nature.

     "Hydrocarbons" means oil, gas, casinghead gas, drip gasoline, natural
gasoline, condensate, distillate, liquid hydrocarbons, gaseous hydrocarbons and
all products refined or separated therefrom.

     "Indebtedness" means any and all amounts owing or to be owing by the
Borrower, any Restricted Subsidiary or any Guarantor: (a) to the Administrative
Agent, the Issuing Bank or any Lender under any Loan Document, (b) to any Lender
or any Affiliate of a Lender under any Swap Agreement between the Borrower or
any Restricted Subsidiary and such Lender or Affiliate of a Lender while such
Person (or in the case of its Affiliate, the Person affiliated therewith) is a
Lender hereunder and (c) all renewals, extensions and/or rearrangements of any
of the above.

     "Indemnified Taxes" means Taxes other than Excluded Taxes.

     "Information Memorandum" means the Confidential Information Memorandum
dated June 2005 relating to the Borrower and the Transactions.

     "Initial Reserve Report" means the respective reports internally generated
by the Borrower with respect to certain Oil and Gas Properties of the Borrower
and the Restricted


                                       11

<PAGE>

Subsidiaries as of July 1, 2005, and Mission with respect to certain Oil and Gas
Properties of Mission and its Subsidiaries as of July 1, 2005.

     "Intercreditor Agreement" means in respect of the Second Lien Term Loan
Agreement, the terms of subordination as attached as Annex II to the Second Lien
Term Loan Agreement.

     "Interest Election Request" means a request by the Borrower to convert or
continue a Borrowing in accordance with Section 2.04.

     "Interest Expense" means, for any period, the sum (determined without
duplication) of the aggregate of (i) all cash dividends paid on the Borrower's
preferred Equity Interests and (ii) gross interest expense of the Borrower and
the Consolidated Restricted Subsidiaries for such period, including to the
extent included in interest expense under GAAP: (a) amortization of debt
discount, (b) capitalized interest and (c) the portion of any payments or
accruals under Capital Leases allocable to interest expense, plus the portion of
any payments or accruals under Synthetic Leases allocable to interest expense
whether or not the same constitutes interest expense under GAAP.

     "Interest Payment Date" means (a) with respect to any ABR Loan, the last
day of each March, June, September and December and (b) with respect to any
Eurodollar Loan, the last day of the Interest Period applicable to the Borrowing
of which such Loan is a part and, in the case of a Eurodollar Borrowing with an
Interest Period of more than three months' duration, each day prior to the last
day of such Interest Period that occurs at intervals of three months' duration
after the first day of such Interest Period.

     "Interest Period" means with respect to any Eurodollar Borrowing, the
period commencing on the date of such Borrowing and ending on the numerically
corresponding day in the calendar month that is one, two, three or six months
(or, with the consent of each Lender, nine or twelve months) thereafter, as the
Borrower may elect; provided, that (a) if any Interest Period would end on a day
other than a Business Day, such Interest Period shall be extended to the next
succeeding Business Day unless such next succeeding Business Day would fall in
the next calendar month, in which case such Interest Period shall end on the
next preceding Business Day and (b) any Interest Period pertaining to a
Eurodollar Borrowing that commences on the last Business Day of a calendar month
(or on a day for which there is no numerically corresponding day in the last
calendar month of such Interest Period) shall end on the last Business Day of
the last calendar month of such Interest Period. For purposes hereof, the date
of a Borrowing initially shall be the date on which such Borrowing is made and
thereafter shall be the effective date of the most recent conversion or
continuation of such Borrowing.

     "Interim Redetermination" has the meaning assigned such term in Section
2.07(b).

     "Interim Redetermination Date" means the date on which a Borrowing Base
that has been redetermined pursuant to an Interim Redetermination becomes
effective as provided in Section 2.07(d).

     "Investment" means, for any Person: (a) the acquisition (whether for cash,
Property, services or securities or otherwise) of Equity Interests of any other
Person or any agreement to make any such acquisition (including, without
limitation, any "short sale" or any sale of any


                                       12

<PAGE>

securities at a time when such securities are not owned by the Person entering
into such short sale); (b) the making of any deposit with, or advance, loan or
other extension of credit to, any other Person (including the purchase of
Property from another Person subject to an understanding or agreement,
contingent or otherwise, to resell such Property to such Person, but excluding
any such advance, loan or extension of credit having a term not exceeding ninety
(90) days representing the purchase price of inventory or supplies sold by such
Person in the ordinary course of business) or (c) the entering into of any
guarantee of, or other contingent obligation (including the deposit of any
Equity Interests to be sold) with respect to, Debt or other liability of any
other Person and (without duplication) any amount committed to be advanced, lent
or extended to such Person.

     "Issuing Bank" means BNP Paribas, in its capacity as the issuer of Letters
of Credit hereunder, and its successors in such capacity as provided in Section
2.08(i). The Issuing Bank may, in its discretion, arrange for one or more
Letters of Credit to be issued by Affiliates of the Issuing Bank, in which case
the term "Issuing Bank" shall include any such Affiliate with respect to Letters
of Credit issued by such Affiliate.

     "Knowledge" means, with respect to an individual, his or her actual
knowledge and with respect to any corporation, limited liability company,
partnership or other business entity, the actual knowledge of any officer,
general partner or individual being a member of the executive management of such
entity.

     "LC Commitment" at any time means Twenty-Five Million Dollars
($25,000,000).

     "LC Disbursement" means a payment made by the Issuing Bank pursuant to a
Letter of Credit.

     "LC Exposure" means, at any time, the sum of (a) the aggregate undrawn
amount of all outstanding Letters of Credit at such time plus (b) the aggregate
amount of all LC Disbursements that have not yet been reimbursed by or on behalf
of the Borrower at such time. The LC Exposure of any Lender at any time shall be
its Applicable Percentage of the total LC Exposure at such time.

     "Lenders" means the Persons listed on Annex I and any Person that shall
have become a party hereto pursuant to an Assignment and Assumption, other than
any such Person that ceases to be a party hereto pursuant to an Assignment and
Assumption.

     "Letter of Credit" means any letter of credit issued pursuant to this
Agreement.

     "Letter of Credit Agreements" means all letter of credit applications and
other agreements (including any amendments, modifications or supplements
thereto) submitted by the Borrower, or entered into by the Borrower, with the
Issuing Bank relating to any Letter of Credit.

     "LIBO Rate" means, with respect to any Eurodollar Borrowing for any
Interest Period, the rate appearing on Page 3750 of the Dow Jones Market Service
(or on any successor or substitute page of such Service, or any successor to or
substitute for such Service, providing rate quotations comparable to those
currently provided on such page of such Service, as determined by the
Administrative Agent from time to time for purposes of providing quotations of
interest


                                       13

<PAGE>

rates applicable to dollar deposits in the London interbank market) at
approximately 11:00 a.m., London time, two Business Days prior to the
commencement of such Interest Period, as the rate for dollar deposits with a
maturity comparable to such Interest Period. In the event that such rate is not
available at such time for any reason, then the "LIBO Rate" with respect to such
Eurodollar Borrowing for such Interest Period shall be the rate (rounded
upwards, if necessary, to the next 1/16 of 1%) at which dollar deposits of
$5,000,000 and for a maturity comparable to such Interest Period are offered by
the principal London office of the Administrative Agent in immediately available
funds in the London interbank market at approximately 11:00 a.m., London time,
two Business Days prior to the commencement of such Interest Period.

     "Lien" means any interest in Property securing an obligation owed to, or a
claim by, a Person other than the owner of the Property, whether such interest
is based on the common law, statute or contract, and whether such obligation or
claim is fixed or contingent, and including but not limited to (a) the lien or
security interest arising from a mortgage, encumbrance, pledge, security
agreement, conditional sale or trust receipt or a lease, consignment or bailment
for security purposes or (b) production payments and the like payable out of Oil
and Gas Properties. The term "Lien" shall include easements, restrictions,
servitudes, permits, conditions, covenants, exceptions or reservations. For the
purposes of this Agreement, the Borrower and its Restricted Subsidiaries shall
be deemed to be the owner of any Property which it has acquired or holds subject
to a conditional sale agreement, or leases under a financing lease or other
arrangement pursuant to which title to the Property has been retained by or
vested in some other Person in a transaction intended to create a financing.

     "Loan Documents" means this Agreement, the Notes, if any, the Letter of
Credit Agreements, the Letters of Credit, the Security Instruments and any
Intercreditor Agreement.

     "Loans" means the loans made by the Lenders to the Borrower pursuant to
this Agreement.

     "Majority Lenders" means, at any time while no Loans or LC Exposure is
outstanding, Lenders having at least sixty-six and two-thirds percent (66-2/3%)
of the Aggregate Maximum Credit Amounts; and at any time while any Loans or LC
Exposure is outstanding, Lenders holding at least sixty-six and two-thirds
percent (66-2/3%) of the outstanding aggregate principal amount of the Loans or
participation interests in Letters of Credit (without regard to any sale by a
Lender of a participation in any Loan under Section 12.04(c)).

     "Material Adverse Effect" means a material adverse effect on (a) the
business, operations, Property, condition (financial or otherwise) or prospects
of the Borrower and the Restricted Subsidiaries taken as a whole, (b) the
ability of the Borrower, any Restricted Subsidiary or any Guarantor to perform
any of its obligations under any Loan Document, (c) the validity or
enforceability of any Loan Document or (d) the rights and remedies of or
benefits available to the Administrative Agent, any other Agent, the Issuing
Bank or any Lender under any Loan Document.

     "Material Domestic Subsidiary" means, as of any date, any Domestic
Subsidiary that (a) is a Wholly-Owned Subsidiary and (b) together with its
Restricted Subsidiaries, owns Property having a fair market value of $500,000 or
more.


                                       14

<PAGE>

     "Material Indebtedness" means Debt (other than the Loans and Letters of
Credit), or obligations in respect of one or more Swap Agreements, of any one or
more of the Borrower and its Restricted Subsidiaries in an aggregate principal
amount exceeding $1,000,000. For purposes of determining Material Indebtedness,
the "principal amount" of the obligations of the Borrower or any Restricted
Subsidiary in respect of any Swap Agreement at any time shall be the maximum
aggregate amount (giving effect to any netting agreements) that the Borrower or
such Subsidiary would be required to pay if such Swap Agreement were terminated
at such time.

     "Maturity Date" means July 28, 2009.

     "Maximum Credit Amount" means, as to each Lender, the amount set forth
opposite such Lender's name on Annex I under the caption "Maximum Credit
Amounts", as the same may be (a) reduced or terminated from time to time in
connection with a reduction or termination of the Aggregate Maximum Credit
Amounts pursuant to Section 2.06(b) or (b) modified from time to time pursuant
to any assignment permitted by Section 12.04(b).

     "Mergers" means the merger of Petrohawk Acquisition Corporation into
Mission, and the subsequent merger of Mission into the Borrower.

     "Merger Documents" means the Agreement and Plan of Merger by and among the
Borrower, Petrohawk Acquisition Corporation, a Delaware corporation, and
Mission, dated as of April 3, 2005, and all other agreements, instruments and
documents executed in connection with the Mergers.

     "Mission" means Mission Resources Corporation, a Delaware corporation.

     "Mission Credit Agreement" means (i) that certain Credit Agreement dated as
of April 8, 2004 among Mission, each of the lenders party thereto and Wells
Fargo Bank, National Association, as administrative agent for the lenders and
(ii) that certain Term Loan Agreement dated as of April 8, 2004 between Mission,
each of the lenders party thereto and Guggenheim, Corporate Funding, LLC, as
collateral agent for the lenders.

     "Moody's" means Moody's Investors Service, Inc. and any successor thereto
that is a nationally recognized rating agency.

     "Mortgaged Property" means any Property owned by the Borrower or any
Guarantor which is subject to the Liens existing and to exist under the terms of
the Security Instruments.

     "Multiemployer Plan" means a Plan which is a multiemployer plan as defined
in section 3(37) or 4001 (a)(3) of ERISA.

     "Net Cash Proceeds" means in connection with any issuance or sale of Equity
Interests or Debt securities or instruments or the incurrence of loans, the cash
proceeds received from such issuance or incurrence, net of attorneys' fees,
investment banking fees, accountants' fees, underwriting discounts and
commissions and other customary fees and expenses actually incurred in
connection therewith.

     "New Borrowing Base Notice" has the meaning assigned such term in Section
2.07(d).


                                       15

<PAGE>

     "Non-Recourse Debt" means any Debt of any Unrestricted Subsidiary, in each
case in respect of which: (a) the holder or holders thereof (i) shall have
recourse only to, and shall have the right to require the obligations of such
Unrestricted Subsidiary to be performed, satisfied, and paid only out of, the
Property of such Unrestricted Subsidiary and/or one or more of its Subsidiaries
(but only to the extent that such Subsidiaries are Unrestricted Subsidiaries)
and/or any other Person (other than Borrower and/or any Restricted Subsidiary)
and (ii) shall have no direct or indirect recourse (including by way of
guaranty, support or indemnity) to the Borrower or any Restricted Subsidiary or
to any of the Property of Borrower or any Restricted Subsidiary, whether for
principal, interest, fees, expenses or otherwise; and (b) the terms and
conditions relating to the non-recourse nature of such Debt are in form and
substance reasonably acceptable to the Administrative Agent.

     "Notes" means the promissory notes of the Borrower as requested by a Lender
and described in Section 2.02(d) and being substantially in the form of Exhibit
A, together with all amendments, modifications, replacements, extensions and
rearrangements thereof.

     "Oil and Gas Properties" means (a) Hydrocarbon Interests; (b) the
Properties now or hereafter pooled or unitized with Hydrocarbon Interests; (c)
all presently existing or future unitization, pooling agreements and
declarations of pooled units and the units created thereby (including without
limitation all units created under orders, regulations and rules of any
Governmental Authority) which may affect all or any portion of the Hydrocarbon
Interests; (d) all operating agreements, contracts and other agreements,
including production sharing contracts and agreements, which relate to any of
the Hydrocarbon Interests or the production, sale, purchase, exchange or
processing of Hydrocarbons from or attributable to such Hydrocarbon Interests;
(e) all Hydrocarbons in and under and which may be produced and saved or
attributable to the Hydrocarbon Interests, including all oil in tanks, and all
rents, issues, profits, proceeds, products, revenues and other incomes from or
attributable to the Hydrocarbon Interests; (f) all tenements, hereditaments,
appurtenances and Properties in any manner appertaining, belonging, affixed or
incidental to the Hydrocarbon Interests and (g) all Properties, rights, titles,
interests and estates described or referred to above, including any and all
Property, real or personal, now owned or hereinafter acquired and situated upon,
used, held for use or useful in connection with the operating, working or
development of any of such Hydrocarbon Interests or Property (excluding drilling
rigs, automotive equipment, rental equipment or other personal Property which
may be on such premises for the purpose of drilling a well or for other similar
temporary uses) and including any and all oil wells, gas wells, injection wells
or other wells, buildings, structures, fuel separators, liquid extraction
plants, plant compressors, pumps, pumping units, field gathering systems, tanks
and tank batteries, fixtures, valves, fittings, machinery and parts, engines,
boilers, meters, apparatus, equipment, appliances, tools, implements, cables,
wires, towers, casing, tubing and rods, surface leases, rights-of-way, easements
and servitudes together with all additions, substitutions, replacements,
accessions and attachments to any and all of the foregoing.

     "Other Taxes" means any and all present or future stamp or documentary
taxes or any other excise or Property taxes, charges or similar levies arising
from any payment made hereunder or from the execution, delivery or enforcement
of, or otherwise with respect to, this Agreement and any other Loan Document.


                                       16

<PAGE>

     "Participant" has the meaning set forth in Section 12.04(c)(i).

     "PBGC" means the Pension Benefit Guaranty Corporation, or any successor
thereto.

     "Permitted Holders" means PHAWK LLC, a Delaware limited liability company,
EnCap Investments, L.P., Liberty Energy Holdings, Floyd C. Wilson, and each of
their respective Affiliates.

     "Permitted Refinancing Debt" means Debt (for purposes of this definition,
"new Debt") incurred in exchange for, or proceeds of which are used to
refinance, all of any other Debt (the "Refinanced Debt"); provided that (a) such
new Debt is in an aggregate principal amount not in excess of the sum of (i) the
aggregate principal amount then outstanding of the Refinanced Debt (or, if the
Refinanced Debt is exchanged or acquired for an amount less than the principal
amount thereof to be due and payable upon a declaration of acceleration thereof,
such lesser amount) and (ii) an amount necessary to pay any fees and expenses,
including premiums, related to such exchange or refinancing; (b) such new Debt
has a stated maturity no earlier than the stated maturity of the Refinanced Debt
and an average life no shorter than the average life of the Refinanced Debt; (c)
such new Debt does not have a stated interest rate in excess of the stated
interest rate of the Refinanced Debt, except that with respect to any Debt
refinancing of the Senior Unsecured Notes pursuant to a Change of Control tender
or as a direct consequence of the Mergers within 2 months of the Effective Date,
such new Debt does not have a stated interest rate in excess of 12-3/8 % per
annum; (d) such new Debt does not contain any covenants which are more onerous
to the Borrower and its Restricted Subsidiaries than those imposed by the
Refinanced Debt and (e) such new Debt (and any guarantees thereof) is
subordinated in right of payment to the Indebtedness (or, if applicable, the
Guaranty Agreement) to at least the same extent as the Refinanced Debt.

     "Person" means any natural person, corporation, limited liability company,
trust, joint venture, association, company, partnership, Governmental Authority
or other entity.

     "Plan" means any employee pension benefit plan, as defined in section 3(2)
of ERISA, which (a) is currently or hereafter sponsored, maintained or
contributed to by the Borrower, a Subsidiary or an ERISA Affiliate or (b) was at
any time during the six calendar years preceding the date hereof, sponsored,
maintained or contributed to by the Borrower or a Subsidiary or an ERISA
Affiliate.

     "Prime Rate" means the rate of interest per annum publicly announced from
time to time by the Administrative Agent as its prime rate in effect at its
principal office in New York City; each change in the Prime Rate shall be
effective from and including the date such change is publicly announced as being
effective. Such rate is set by the Administrative Agent as a general reference
rate of interest, taking into account such factors as the Administrative Agent
may deem appropriate; it being understood that many of the Administrative
Agent's commercial or other loans are priced in relation to such rate, that it
is not necessarily the lowest or best rate actually charged to any customer and
that the Administrative Agent may make various commercial or other loans at
rates of interest having no relationship to such rate.


                                       17

<PAGE>

     "Property" means any interest in any kind of property or asset, whether
real, personal or mixed, or tangible or intangible, including, without
limitation, cash, securities, accounts and contract rights.

     "Proposed Borrowing Base" has the meaning assigned to such term in Section
2.07(c)(i).

     "Proposed Borrowing Base Notice" has the meaning assigned to such term in
Section 2.07(c)(ii).

     "Redemption" means with respect to any Debt, the repurchase, redemption,
prepayment, repayment, defeasance or any other acquisition or retirement for
value (or the segregation of funds with respect to any of the foregoing) of such
Debt. "Redeem" has the correlative meaning thereto.

     "Redetermination Date" means, with respect to any Scheduled Redetermination
or any Interim Redetermination, the date that the redetermined Borrowing Base
related thereto becomes effective pursuant to Section 2.07(d).

     "Register" has the meaning assigned such term in Section 12.04(b)(iv).

     "Regulation D" means Regulation D of the Board, as the same may be amended,
supplemented or replaced from time to time.

     "Related Parties" means, with respect to any specified Person, such
Person's Affiliates and the respective directors, officers, employees, agents
and advisors (including attorneys, accountants and experts) of such Person and
such Person's Affiliates.

     "Remedial Work" has the meaning assigned such term in Section 8.10(a).

     "Required Lenders" means, at any time while no Loans or LC Exposure is
outstanding, Lenders having in excess of eighty-seven and one-half percent
(87-1/2%) of the Aggregate Maximum Credit Amounts; and at any time while any
Loans or LC Exposure is outstanding, Lenders holding in excess of eighty-seven
and one-half percent (87-1/2%) of the outstanding aggregate principal amount of
the Loans or participation interests in such Letters of Credit (without regard
to any sale by a Lender of a participation in any Loan under Section 12.04(c)).

     "Reserve Report" means a report, in form and substance reasonably
satisfactory to the Administrative Agent, setting forth, as of each January 1st
or July 1st (or such other date in the event of an Interim Redetermination) the
oil and gas reserves attributable to the Oil and Gas Properties of the Borrower
and the Restricted Subsidiaries, together with a projection of the rate of
production and future net income, taxes, operating expenses and capital
expenditures with respect thereto as of such date, based upon the pricing
assumptions consistent with SEC reporting requirements at the time.

     "Responsible Officer" means, as to any Person, the Chief Executive Officer,
the President, any Financial Officer or any Vice President of such Person.
Unless otherwise specified, all references to a Responsible Officer herein shall
mean a Responsible Officer of the Borrower.


                                       18

<PAGE>

     "Restricted Payment" means any dividend or other distribution (whether in
cash, securities or other Property) with respect to any Equity Interests in the
Borrower, or any payment (whether in cash, securities or other Property),
including any sinking fund or similar deposit, on account of the purchase,
redemption, retirement, acquisition, cancellation or termination of any such
Equity Interests in the Borrower or any option, warrant or other right to
acquire any such Equity Interests in the Borrower.

     "Restricted Subsidiary" means any Subsidiary of the Borrower that is not an
Unrestricted Subsidiary.

     "Revolving Credit Exposure" means, with respect to any Lender at any time,
the sum of the outstanding principal amount of such Lender's Loans and its LC
Exposure at such time.

     "Scheduled Redetermination" has the meaning assigned such term in Section
2.07(b).

     "Scheduled Redetermination Date" means the date on which a Borrowing Base
that has been redetermined pursuant to a Scheduled Redetermination becomes
effective as provided in Section 2.07(d).

     "SEC" means the Securities and Exchange Commission or any successor
Governmental Authority.

     "Second Lien Term Loan Agreement" means that certain Amended and Restated
Second Lien Term Loan Credit Agreement as amended and restated on the Effective
Date among the Borrower, BNP Paribas, as the Second Lien Administrative Agent,
and the lenders party thereto, and any "Loan Documents" (as defined therein)
executed in connection therewith, in each case, as hereafter amended or
supplemented pursuant to Section 9.04(b).

     "Security Instruments" means the Guaranty Agreement, mortgages, deeds of
trust and other agreements, instruments or certificates described or referred to
in Exhibit F-1, and any and all other agreements, instruments or certificates
now or hereafter executed and delivered by the Borrower or any other Person
(other than Swap Agreements with the Lenders or any Affiliate of a Lender or
participation or similar agreements between any Lender and any other lender or
creditor with respect to any Indebtedness pursuant to this Agreement) in
connection with, or as security for the payment or performance of the
Indebtedness, the Loans, the Notes, if any, this Agreement, or reimbursement
obligations under the Letters of Credit, as such agreements may be amended,
modified, supplemented or restated from time to time.

     "Senior Indenture" means that certain Indenture dated as of April 8, 2004
among the Borrower (as successor by merger to Mission), the Subsidiary
Guarantors (as defined therein) and The Bank of New York, as trustee, as the
same has been amended or supplemented on or prior to the Effective Date and as
the same may hereafter be amended or supplemented pursuant to Section 9.04(b).

     "Senior Unsecured Notes" means those certain $130,000,000 9-7/8% Senior
Notes due 2011, issued by the Borrower (as successor to Mission), as issuer
pursuant to the Senior Indenture.


                                       19

<PAGE>

     "S&P" means Standard & Poor's Ratings Group, a division of The McGraw-Hill
Companies, Inc., and any successor thereto that is a nationally recognized
rating agency.

     "Statutory Reserve Rate" means a fraction (expressed as a decimal), the
numerator of which is the number one and the denominator of which is the number
one minus the aggregate of the maximum reserve percentages (including any
marginal, special, emergency or supplemental reserves) expressed as a decimal
established by the Board to which the Administrative Agent is subject with
respect to the Adjusted LIBO Rate, for eurocurrency funding (currently referred
to as "Eurocurrency Liabilities" in Regulation D of the Board). Such reserve
percentages shall include those imposed pursuant to such Regulation D.
Eurodollar Loans shall be deemed to constitute eurocurrency funding and to be
subject to such reserve requirements without benefit of or credit for proration,
exemptions or offsets that may be available from time to time to any Lender
under such Regulation D or any comparable regulation. The Statutory Reserve Rate
shall be adjusted automatically on and as of the effective date of any change in
any reserve percentage.

     "Subordinated Debt" means the Second Lien Term Loan Documents and the
Senior Unsecured Notes.

     "Subsidiary" means: (a) any Person of which at least a majority of the
outstanding Equity Interests having by the terms thereof ordinary voting power
to elect a majority of the board of directors, manager or other governing body
of such Person (irrespective of whether or not at the time Equity Interests of
any other class or classes of such Person shall have or might have voting power
by reason of the happening of any contingency) is at the time directly or
indirectly owned or controlled by the Borrower or one or more of its
Subsidiaries or by the Borrower and one or more of its Subsidiaries and (b) any
partnership of which the Borrower or any of its Subsidiaries is a general
partner. Unless otherwise indicated herein, each reference to the term
"Subsidiary" shall mean a Subsidiary of the Borrower.

     "Swap Agreement" means any agreement with respect to any swap, forward,
future or derivative transaction, collar or option or similar agreement, whether
exchange traded, "over-the-counter" or otherwise, involving, or settled by
reference to, one or more rates, currencies, commodities, equity or debt
instruments or securities, or economic, financial or pricing indices or measures
of economic, financial or pricing risk or value or any similar transaction or
any combination of these transactions; provided that no phantom stock or similar
plan providing for payments only on account of services provided by current or
former directors, officers, employees or consultants of the Borrower or the
Subsidiaries shall be a Swap Agreement.

     "Synthetic Leases" means, in respect of any Person, all leases which shall
have been, or should have been, in accordance with GAAP, treated as operating
leases on the financial statements of the Person liable (whether contingently or
otherwise) for the payment of rent thereunder and which were properly treated as
indebtedness for borrowed money for purposes of U.S. federal income taxes, if
the lessee in respect thereof is obligated to either purchase for an amount in
excess of, or pay upon early termination an amount in excess of, 80% of the
residual value of the Property subject to such operating lease upon expiration
or early termination of such lease.


                                       20

<PAGE>

     "Taxes" means any and all present or future taxes, levies, imposts, duties,
deductions, charges or withholdings imposed by any Governmental Authority.

     "Termination Date" means the earlier of the Maturity Date and the date of
termination of the Commitments.

     "Total Debt" means, at any date, all Debt of the Borrower and the
Consolidated Restricted Subsidiaries on a consolidated basis less (i) Cash
Equivalents, (ii) letters of credit issued for the account of the Borrower
and/or any of its Restricted Subsidiaries but only to the extent the aggregate
face amount of all such letters of credit is less than $5,000,000 and (iii)
surety bonds permitted under Section 9.02(e) to the extent the aggregate face
amount of all such bonds does not exceed $55,000,000.

     "Transactions" means, with respect to (a) the Borrower, the execution,
delivery and performance by the Borrower of this Agreement, each other Loan
Document and each Merger Document to which it is a party, the Mergers, the
borrowing of Loans, the use of the proceeds thereof and the issuance of Letters
of Credit hereunder, and the grant of Liens by the Borrower on Mortgaged
Properties and other Properties pursuant to the Security Instruments and (b)
each Guarantor, the execution, delivery and performance by such Guarantor of
each Loan Document and Merger Document to which it is a party, the Mergers, the
guaranteeing of the Indebtedness and the other obligations under the Guaranty
Agreement by such Guarantor and such Guarantor's grant of the security interests
and provision of collateral thereunder, and the grant of Liens by such Guarantor
on Mortgaged Properties and other Properties pursuant to the Security
Instruments.

     "Type", when used in reference to any Loan or Borrowing, refers to whether
the rate of interest on such Loan, or on the Loans comprising such Borrowing, is
determined by reference to the Alternate Base Rate or the Adjusted LIBO Rate.

     "Unrestricted Subsidiary" means any Subsidiary of the Borrower designated
as such on Schedule 7.15 or which the Borrower has designated in writing to the
Administrative Agent to be an Unrestricted Subsidiary pursuant to Section 9.06.

     "Wholly-Owned Subsidiary" means any Restricted Subsidiary of which all of
the outstanding Equity Interests (other than any directors' qualifying shares
mandated by applicable law), on a fully-diluted basis, are owned by the Borrower
or one or more of the Wholly-Owned Subsidiaries or by the Borrower and one or
more of the Wholly-Owned Subsidiaries.

     Section 1.03 Types of Loans and Borrowings. For purposes of this Agreement,
Loans and Borrowings, respectively, may be classified and referred to by Type
(e.g., a "Eurodollar Loan" or a "Eurodollar Borrowing").

     Section 1.04 Terms Generally; Rules of Construction. The definitions of
terms herein shall apply equally to the singular and plural forms of the terms
defined. Whenever the context may require, any pronoun shall include the
corresponding masculine, feminine and neuter forms. The words "include",
"includes" and "including" shall be deemed to be followed by the phrase "without
limitation". The word "will" shall be construed to have the same meaning and
effect as the word "shall". Unless the context requires otherwise (a) any
definition of or reference to any


                                       21

<PAGE>

agreement, instrument or other document herein shall be construed as referring
to such agreement, instrument or other document as from time to time amended,
supplemented or otherwise modified (subject to any restrictions on such
amendments, supplements or modifications set forth herein), (b) any reference
herein to any law shall be construed as referring to such law as amended,
modified, codified or reenacted, in whole or in part, and in effect from time to
time, (c) any reference herein to any Person shall be construed to include such
Person's successors and assigns (subject to the restrictions contained herein),
(d) the words "herein", "hereof" and "hereunder", and words of similar import,
shall be construed to refer to this Agreement in its entirety and not to any
particular provision hereof, (e) with respect to the determination of any time
period, the word "from" means "from and including" and the word "to" means "to
and including" and (f) any reference herein to Articles, Sections, Annexes,
Exhibits and Schedules shall be construed to refer to Articles and Sections of,
and Annexes, Exhibits and Schedules to, this Agreement. No provision of this
Agreement or any other Loan Document shall be interpreted or construed against
any Person solely because such Person or its legal representative drafted such
provision.

     Section 1.05 Accounting Terms and Determinations; GAAP. Unless otherwise
specified herein, all accounting terms used herein shall be interpreted, all
determinations with respect to accounting matters hereunder shall be made, and
all financial statements and certificates and reports as to financial matters
required to be furnished to the Administrative Agent or the Lenders hereunder
shall be prepared, in accordance with GAAP, applied on a basis consistent with
the Financial Statements except for changes in which Borrower's independent
certified public accountants concur and which are disclosed to Administrative
Agent on the next date on which financial statements are required to be
delivered to the Lenders pursuant to Section 8.01(a); provided that, unless the
Borrower and the Majority Lenders shall otherwise agree in writing, no such
change shall modify or affect the manner in which compliance with the covenants
contained herein is computed such that all such computations shall be conducted
utilizing financial information presented consistently with prior periods.

                                   ARTICLE II
                                   THE CREDITS

     Section 2.01 Commitments. Subject to the terms and conditions set forth
herein, each Lender agrees to make Loans to the Borrower during the Availability
Period in an aggregate principal amount that will not result in (a) such
Lender's Revolving Credit Exposure exceeding such Lender's Commitment or (b) the
total Revolving Credit Exposures exceeding the total Commitments. Within the
foregoing limits and subject to the terms and conditions set forth herein, the
Borrower may borrow, repay and reborrow the Loans. On the Effective Date (or as
soon as practicable with respect to (iii)):

               (i) the Borrower shall pay all accrued and unpaid commitment
fees, break funding fees under Section 5.02 and all other fees that are
outstanding under the Existing Credit Agreement for the account of each "Lender"
under the Existing Credit Agreement;

               (ii) each "ABR Loan" and "Eurodollar Loan" outstanding under the
Existing Credit Agreement shall be deemed to be repaid with the proceeds of a
new ABR Loan or Eurodollar Loan, as applicable, under this Agreement;


                                       22

<PAGE>

               (iii) the Administrative Agent shall use reasonable efforts to
cause such "Lender" under the Existing Credit Agreement to deliver to the
Borrower as soon as practicable after the Effective Date the Note issued by the
Borrower to it under the Existing Credit Agreement, marked "canceled" or
otherwise similarly defaced;

               (iv) each Letter of Credit issued and outstanding under the
Existing Credit Agreement shall be deemed issued under this Agreement without
the payment of additional fees; and

               (v) the Existing Credit Agreement and the commitments thereunder
shall be superceded by this Agreement and such commitments shall terminate.

It is the intent of the parties hereto that this Agreement not constitute a
novation of the obligations and liabilities existing under the Existing Credit
Agreement or evidence repayment of any such obligations and liabilities and that
this Agreement amend and restate in its entirety the Existing Credit Agreement
and re-evidence the obligations of the Borrower outstanding thereunder.

     Section 2.02 Loans and Borrowings.

          (a) Borrowings; Several Obligations. Each Loan shall be made as part
of a Borrowing consisting of Loans made by the Lenders ratably in accordance
with their respective Commitments. The failure of any Lender to make any Loan
required to be made by it shall not relieve any other Lender of its obligations
hereunder; provided that the Commitments are several and no Lender shall be
responsible for any other Lender's failure to make Loans as required.

          (b) Types of Loans. Subject to Section 3.03, each Borrowing shall be
comprised entirely of ABR Loans or Eurodollar Loans as the Borrower may request
in accordance herewith. Each Lender at its option may make any Eurodollar Loan
by causing any domestic or foreign branch or Affiliate of such Lender to make
such Loan; provided that any exercise of such option shall not affect the
obligation of the Borrower to repay such Loan in accordance with the terms of
this Agreement.

          (c) Minimum Amounts; Limitation on Number of Borrowings. At the
commencement of each Interest Period for any Eurodollar Borrowing, such
Borrowing shall be in an aggregate amount that is an integral multiple of
$1,000,000 and not less than $1,000,000. At the time that each ABR Borrowing is
made, such Borrowing shall be in an aggregate amount that is an integral
multiple of $1,000,000 and not less than $1,000,000; provided that an ABR
Borrowing may be in an aggregate amount that is equal to the entire unused
balance of the total Commitments or that is required to finance the
reimbursement of an LC Disbursement as contemplated by Section 2.08(e).
Borrowings of more than one Type may be outstanding at the same time, provided
that there shall not at any time be more than a total of 8 Eurodollar Borrowings
outstanding. Notwithstanding any other provision of this Agreement, the Borrower
shall not be entitled to request, or to elect to convert or continue, any
Borrowing if the Interest Period requested with respect thereto would end after
the Maturity Date.

          (d) Notes. Each Lender shall maintain in accordance with its usual
practice an account or accounts evidencing the indebtedness of the Borrower to
such Lender resulting from


                                       23

<PAGE>

each Loan made by such Lender, including the amounts of principal and interest
payable and paid to such Lender from time to time hereunder. The Administrative
Agent shall maintain accounts in which it shall record (i) the amount of each
Loan made hereunder, the Type thereof and the Interest Period applicable
thereto, (ii) the amount of any principal or interest due and payable or to
become due and payable from the Borrower to each Lender hereunder and (iii) the
amount of any sum received by the Administrative Agent hereunder for the account
of the Lenders and each Lender's share thereof. The entries made in the accounts
maintained pursuant to this Section 2.02(d) shall be prima facie evidence of the
existence and amounts of the obligations recorded therein; provided that the
failure of any Lender or the Administrative Agent to maintain such accounts or
any error therein shall not in any manner affect the obligation of the Borrower
to repay the Loans in accordance with the terms of this Agreement. Any Lender
may request that Loans made by it be evidenced by a Note. In such event, the
Borrower shall prepare, execute and deliver to such Lender a Note payable to the
order of such Lender and substantially in the form of Exhibit A dated, in the
case of (i) any Lender party hereto as of the date of this Agreement, as of the
date of this Agreement or (ii) any Lender that becomes a party hereto pursuant
to an Assignment and Assumption, as of the effective date of the Assignment and
Assumption, payable to the order of such Lender in a principal amount equal to
its Maximum Credit Amount as in effect on such date, and otherwise duly
completed. Thereafter, the Loans evidenced by such Note and interest thereon
shall at all times (including after assignment pursuant to Section 12.04) be
represented by one or more Notes in such form payable to the order of the payee
named therein (or, if such Note is a registered note, to such payee and its
registered assigns). In the event that any Lender's Maximum Credit Amount
increases or decreases for any reason (whether pursuant to Section 2.06, Section
12.04(b) or otherwise), the Borrower shall deliver or cause to be delivered on
the effective date of such increase or decrease, a new Note payable to the order
of such Lender in a principal amount equal to its Maximum Credit Amount after
giving effect to such increase or decrease, and otherwise duly completed. The
date, amount, Type, interest rate and, if applicable, Interest Period of each
Loan made by each Lender, and all payments made on account of the principal
thereof, shall be recorded by such Lender on its books for its Note, and, prior
to any transfer, may be endorsed by such Lender on a schedule attached to such
Note or any continuation thereof or on any separate record maintained by such
Lender. Failure to make any such notation or to attach a schedule shall not
affect any Lender's or the Borrower's rights or obligations in respect of such
Loans or affect the validity of such transfer by any Lender of its Note.

     Section 2.03 Requests for Borrowings. To request a Borrowing, the Borrower
shall notify the Administrative Agent of such request by telephone, fax (or
transmit by electronic communication, if arrangements for doing so have been
approved by the Administrative Agent) (a) in the case of a Eurodollar Borrowing,
not later than 12:00 noon, New York City time, three Business Days before the
date of the proposed Borrowing or (b) in the case of an ABR Borrowing, not later
than 12:00 noon, New York City time, one Business Day before the date of the
proposed Borrowing; provided that no such notice shall be required for any
deemed request of an ABR Borrowing to finance the reimbursement of an LC
Disbursement as provided in Section 2.08(e). Each such telephonic (or electronic
communication) Borrowing Request shall be irrevocable and shall be confirmed
promptly by hand delivery or telecopy to the Administrative Agent of a written
Borrowing Request in substantially the form of Exhibit B and signed by the
Borrower. Each such telephonic, electronic communication, and written Borrowing
Request shall specify the following information in compliance with Section 2.02:


                                       24

<PAGE>

               (i) the aggregate amount of the requested Borrowing;

               (ii) the date of such Borrowing, which shall be a Business Day;

               (iii) whether such Borrowing is to be an ABR Borrowing or a
Eurodollar Borrowing;

               (iv) in the case of a Eurodollar Borrowing, the initial Interest
Period to be applicable thereto, which shall be a period contemplated by the
definition of the term "Interest Period";

               (v) the amount of the then effective Borrowing Base, the current
total Revolving Credit Exposures (without regard to the requested Borrowing) and
the pro forma total Revolving Credit Exposures (giving effect to the requested
Borrowing); and

               (vi) the location and number of the Borrower's account to which
funds are to be disbursed, which shall comply with the requirements of Section
2.05.

If no election as to the Type of Borrowing is specified, then the requested
Borrowing shall be an ABR Borrowing. If no Interest Period is specified with
respect to any requested Eurodollar Borrowing, then the Borrower shall be deemed
to have selected an Interest Period of one month's duration. Each Borrowing
Request shall constitute a representation that the amount of the requested
Borrowing shall not cause the total Revolving Credit Exposures to exceed the
total Commitments (i.e., the lesser of the Aggregate Maximum Credit Amounts and
the then effective Borrowing Base).

Promptly following receipt of a Borrowing Request in accordance with this
Section 2.03, the Administrative Agent shall advise each Lender of the details
thereof and of the amount of such Lender's Loan to be made as part of the
requested Borrowing.

     Section 2.04 Interest Elections.

          (a) Conversion and Continuance. Each Borrowing initially shall be of
the Type specified in the applicable Borrowing Request and, in the case of a
Eurodollar Borrowing, shall have an initial Interest Period as specified in such
Borrowing Request. Thereafter, the Borrower may elect to convert such Borrowing
to a different Type or to continue such Borrowing and, in the case of a
Eurodollar Borrowing, may elect Interest Periods therefor, all as provided in
this Section 2.04. The Borrower may elect different options with respect to
different portions of the affected Borrowing, in which case each such portion
shall be allocated ratably among the Lenders holding the Loans comprising such
Borrowing, and the Loans comprising each such portion shall be considered a
separate Borrowing.

          (b) Interest Election Requests. To make an election pursuant to this
Section 2.04, the Borrower shall notify the Administrative Agent of such
election by telephone, fax (or transmit by electronic communication, if
arrangements for doing so have been approved by the Issuing Bank) by the time
that a Borrowing Request would be required under Section 2.03 if the Borrower
were requesting a Borrowing of the Type resulting from such election to be made
on the effective date of such election. Each such telephonic (or electronic
communication) Interest


                                       25

<PAGE>

Election Request shall be irrevocable and shall be confirmed promptly by hand
delivery or telecopy to the Administrative Agent of a written Interest Election
Request in substantially the form of Exhibit C and signed by the Borrower.

          (c) Information in Interest Election Requests. Each telephonic,
electronic communication and written Interest Election Request shall specify the
following information in compliance with Section 2.02:

               (i) the Borrowing to which such Interest Election Request applies
and, if different options are being elected with respect to different portions
thereof, the portions thereof to be allocated to each resulting Borrowing (in
which case the information to be specified pursuant to Section 2.04(c)(iii) and
(iv) shall be specified for each resulting Borrowing);

               (ii) the effective date of the election made pursuant to such
Interest Election Request, which shall be a Business Day;

               (iii) whether the resulting Borrowing is to be an ABR Borrowing
or a Eurodollar Borrowing; and

               (iv) if the resulting Borrowing is a Eurodollar Borrowing, the
Interest Period to be applicable thereto after giving effect to such election,
which shall be a period contemplated by the definition of the term "Interest
Period".

If any such Interest Election Request requests a Eurodollar Borrowing but does
not specify an Interest Period, then the Borrower shall be deemed to have
selected an Interest Period of one month's duration.

          (d) Notice to Lenders by the Administrative Agent. Promptly following
receipt of an Interest Election Request, the Administrative Agent shall advise
each Lender of the details thereof and of such Lender's portion of each
resulting Borrowing.

          (e) Effect of Failure to Deliver Timely Interest Election Request and
Events of Default on Interest Election. If the Borrower fails to deliver a
timely Interest Election Request with respect to a Eurodollar Borrowing prior to
the end of the Interest Period applicable thereto, then, unless such Borrowing
is repaid as provided herein, at the end of such Interest Period such Borrowing
shall be converted to an ABR Borrowing. Notwithstanding any contrary provision
hereof, if an Event of Default has occurred and is continuing: (i) no
outstanding Borrowing may be converted to or continued as a Eurodollar Borrowing
(and any Interest Election Request that requests the conversion of any Borrowing
to, or continuation of any Borrowing as, a Eurodollar Borrowing shall be
ineffective) and (ii) unless repaid, each Eurodollar Borrowing shall be
converted to an ABR Borrowing at the end of the Interest Period applicable
thereto.

     Section 2.05 Funding of Borrowings.

          (a) Funding by Lenders. Each Lender shall make each Loan to be made by
it hereunder on the proposed date thereof by wire transfer of immediately
available funds by 1:00 p.m., New York City time, to the account of the
Administrative Agent most recently designated by it for such purpose by notice
to the Lenders. The Administrative Agent will make such Loans


                                       26

<PAGE>

available to the Borrower by promptly crediting the amounts so received, in like
funds, to an account of the Borrower maintained with the Administrative Agent in
New York, New York and designated by the Borrower in the applicable Borrowing
Request; provided that ABR Loans made to finance the reimbursement of an LC
Disbursement as provided in Section 2.08(e) shall be remitted by the
Administrative Agent to the Issuing Bank.

          (b) Presumption of Funding by the Lenders. Unless the Administrative
Agent shall have received notice from a Lender prior to the proposed date of any
Borrowing that such Lender will not make available to the Administrative Agent
such Lender's share of such Borrowing, the Administrative Agent may assume that
such Lender has made such share available on such date in accordance with
Section 2.05(a) and may, in reliance upon such assumption, make available to the
Borrower a corresponding amount. In such event, if a Lender has not in fact made
its share of the applicable Borrowing available to the Administrative Agent,
then the applicable Lender and the Borrower severally agree to pay to the
Administrative Agent forthwith on demand such corresponding amount with interest
thereon, for each day from and including the date such amount is made available
to the Borrower to but excluding the date of payment to the Administrative
Agent, at (i) in the case of such Lender, the greater of the Federal Funds
Effective Rate and a rate determined by the Administrative Agent in accordance
with banking industry rules on interbank compensation or (ii) in the case of the
Borrower, the interest rate applicable to ABR Loans. If such Lender pays such
amount to the Administrative Agent, then such amount shall constitute such
Lender's Loan included in such Borrowing.

     Section 2.06 Termination and Reduction of Aggregate Maximum Credit Amounts.

          (a) Scheduled Termination of Commitments. Unless previously
terminated, the Commitments shall terminate on the Maturity Date. If at any time
the Aggregate Maximum Credit Amounts or the Borrowing Base is terminated or
reduced to zero, then the Commitments shall terminate on the effective date of
such termination or reduction.

          (b) Optional Termination and Reduction of Aggregate Credit Amounts.

               (i) The Borrower may at any time terminate, or from time to time
reduce, the Aggregate Maximum Credit Amounts; provided that (A) each reduction
of the Aggregate Maximum Credit Amounts shall be in an amount that is an
integral multiple of $1,000,000 and not less than $5,000,000 and (B) the
Borrower shall not terminate or reduce the Aggregate Maximum Credit Amounts if,
after giving effect to any concurrent prepayment of the Loans in accordance with
Section 3.04(c), the total Revolving Credit Exposures would exceed the total
Commitments.

               (ii) The Borrower shall notify the Administrative Agent of any
election to terminate or reduce the Aggregate Maximum Credit Amounts under
Section 2.06(b)(i) at least three Business Days prior to the effective date of
such termination or reduction, specifying such election and the effective date
thereof. Promptly following receipt of any notice, the Administrative Agent
shall advise the Lenders of the contents thereof. Each notice delivered by the
Borrower pursuant to this Section 2.06(b)(ii) shall be irrevocable; provided
that a notice of termination of the Aggregate Maximum Credit Amounts delivered
by the Borrower may state that such notice is conditioned upon the effectiveness
of other credit


                                       27

<PAGE>

facilities, in which case such notice may be revoked by the Borrower (by notice
to the Administrative Agent on or prior to the specified effective date) if such
condition is not satisfied. Any termination or reduction of the Aggregate
Maximum Credit Amounts shall be permanent and may not be reinstated. Each
reduction of the Aggregate Maximum Credit Amounts shall be made ratably among
the Lenders in accordance with each Lender's Applicable Percentage.

     Section 2.07 Borrowing Base.

          (a) Initial Borrowing Base. For the period from and including the
Effective Date to but excluding the first Redetermination Date, the amount of
the Borrowing Base shall be $280,000,000; provided that the Borrowing Base shall
be reduced by an amount equal to $0.2666666 for every additional dollar of Debt
incurred under the Second Lien Term Loan Agreement that is borrowed in excess of
$75,000,000 and up to $150,000,000 (for the avoidance of doubt, if the Borrower
borrowed the entire incremental $75,000,000, the Borrowing Base would be
$260,000,000). Notwithstanding the foregoing, the Borrowing Base may be subject
to further adjustments from time to time pursuant to Section 8.13(c) or Section
9.13.

          (b) Scheduled and Interim Redeterminations. The Borrowing Base shall
be redetermined semi-annually in accordance with this Section 2.07 (a "Scheduled
Redetermination"), and, subject to Section 2.07(d), such redetermined Borrowing
Base shall become effective and applicable to the Borrower, the Agents, the
Issuing Bank and the Lenders on April 1st and October 1st of each year,
commencing April 1, 2006. In addition, the Borrower may, by notifying the
Administrative Agent thereof, and the Administrative Agent may, at the direction
of the Majority Lenders, by notifying the Borrower thereof, one time during any
12-month period, each elect to cause the Borrowing Base to be redetermined
between Scheduled Redeterminations (an "Interim Redetermination") in accordance
with this Section 2.07.

          (c) Scheduled and Interim Redetermination Procedure.

               (i) Each Scheduled Redetermination and each Interim
Redetermination shall be effectuated as follows: Upon receipt by the
Administrative Agent of (A) the Reserve Report and the certificate required to
be delivered by the Borrower to the Administrative Agent, in the case of a
Scheduled Redetermination, pursuant to Section 8.12(a) and (c), and, in the case
of an Interim Redetermination, pursuant to Section 8.12(b) and (c), and (B) such
other reports, data and supplemental information, including, without limitation,
the information provided pursuant to Section 8.12(c), as may, from time to time,
be reasonably requested by the Majority Lenders (the Reserve Report, such
certificate and such other reports, data and supplemental information being the
"Engineering Reports"), the Administrative Agent shall evaluate the information
contained in the Engineering Reports and shall, in its sole discretion, propose
a new Borrowing Base (the "Proposed Borrowing Base") based upon such information
and such other information (including, without limitation, the status of title
information with respect to the Oil and Gas Properties as described in the
Engineering Reports and the existence of any other Debt) as the Administrative
Agent deems appropriate and consistent with its normal oil and gas lending
criteria as it exists at the particular time. In no event shall the Proposed
Borrowing Base exceed the Aggregate Maximum Credit Amounts.


                                       28

<PAGE>

               (ii) The Administrative Agent shall notify the Borrower and the
Lenders of the Proposed Borrowing Base (the "Proposed Borrowing Base Notice"):

                    (A) in the case of a Scheduled Redetermination (1) if the
Administrative Agent shall have received the Engineering Reports required to be
delivered by the Borrower pursuant to Section 8.12(a) and (c) in a timely and
complete manner, then on or before March 15th and September 15th of such year
following the date of delivery or (2) if the Administrative Agent shall not have
received the Engineering Reports required to be delivered by the Borrower
pursuant to Section 8.12(a) and (c) in a timely and complete manner, then
promptly after the Administrative Agent has received complete Engineering
Reports from the Borrower and has had a reasonable opportunity to determine the
Proposed Borrowing Base in accordance with Section 2.07(c)(i); and

                    (B) in the case of an Interim Redetermination, promptly, and
in any event, within fifteen (15) days after the Administrative Agent has
received the required Engineering Reports.

               (iii) Any Proposed Borrowing Base that would increase the
Borrowing Base then in effect must be approved or deemed to have been approved
by the Required Lenders as provided in this Section 2.07(c)(iii); and any
Proposed Borrowing Base that would decrease or maintain the Borrowing Base then
in effect must be approved or be deemed to have been approved by the Majority
Lenders as provided in this Section 2.07(c)(iii). Upon receipt of the Proposed
Borrowing Base Notice, each Lender shall have fifteen (15) days to agree with
the Proposed Borrowing Base or disagree with the Proposed Borrowing Base by
proposing an alternate Borrowing Base. If at the end of such fifteen (15) days,
any Lender has not communicated its approval or disapproval in writing to the
Administrative Agent, such silence shall be deemed to be an approval of the
Proposed Borrowing Base. If, at the end of such 15-day period, the Required
Lenders, in the case of a Proposed Borrowing Base that would increase the
Borrowing Base then in effect, or the Majority Lenders, in the case of a
Proposed Borrowing Base that would decrease or maintain the Borrowing Base then
in effect, have approved or deemed to have approved, as aforesaid, then the
Proposed Borrowing Base shall become the new Borrowing Base, effective on the
date specified in Section 2.07(d). If, however, at the end of such 15-day
period, the Required or Majority Lenders, as applicable, have not approved or
deemed to have approved, as aforesaid, then the Administrative Agent shall poll
the Lenders to ascertain the highest Borrowing Base then acceptable to the
Majority Lenders for purposes of this Section 2.07 and, so long as such amount
does not increase the Borrowing Base then in effect, such amount shall become
the new Borrowing Base, effective on the date specified in Section 2.07(d).

          (d) Effectiveness of a Redetermined Borrowing Base. After a
redetermined Borrowing Base is approved or is deemed to have been approved by
the Required Lenders or the Majority Lenders, as applicable, pursuant to Section
2.07(c)(iii), the Administrative Agent shall notify the Borrower and the Lenders
of the amount of the redetermined Borrowing Base (the "New Borrowing Base
Notice"), and such amount shall become the new Borrowing Base, effective and
applicable to the Borrower, the Agents, the Issuing Bank and the Lenders:


                                       29

<PAGE>

               (i) in the case of a Scheduled Redetermination, (A) if the
Administrative Agent shall have received the Engineering Reports required to be
delivered by the Borrower pursuant to Section 8.12(a) and (c) in a timely and
complete manner, then on the April 1st or October 1st, as applicable, following
such notice, or (B) if the Administrative Agent shall not have received the
Engineering Reports required to be delivered by the Borrower pursuant to Section
8.12(a) and (c) in a timely and complete manner, then on the Business Day next
succeeding delivery of such notice; and

               (ii) in the case of an Interim Redetermination, on the Business
Day next succeeding delivery of such notice.

Such amount shall then become the Borrowing Base until the next Scheduled
Redetermination Date, the next Interim Redetermination Date or the next
adjustment to the Borrowing Base under Section 8.13(c) or Section 9.13,
whichever occurs first. Notwithstanding the foregoing, no Scheduled
Redetermination or Interim Redetermination shall become effective until the New
Borrowing Base Notice related thereto is received by the Borrower.

          (e) Automatic Redetermination of Borrowing Base. Notwithstanding
anything to the contrary contained herein, upon the Borrower's incurrence of
Debt under the Second Lien Term Loan Agreement greater than $150,000,000, the
Majority Lenders shall have the right to redetermine the Borrowing Base then in
effect as contemplated by Section 2.07(c), and the redetermined Borrowing Base
shall become the new Borrowing Base immediately, effective and applicable to the
Borrower, the Agents, each Lender on such date until the next redetermination or
modification thereof hereunder.

     Section 2.08 Letters of Credit.

          (a) General. Subject to the terms and conditions set forth herein, the
Borrower may request the issuance of dollar denominated Letters of Credit for
its own account or for the account of any of its Restricted Subsidiaries, in a
form reasonably acceptable to the Administrative Agent and the Issuing Bank, at
any time and from time to time during the Availability Period. In the event of
any inconsistency between the terms and conditions of this Agreement and the
terms and conditions of any form of letter of credit application or other
agreement submitted by the Borrower to, or entered into by the Borrower with,
the Issuing Bank relating to any Letter of Credit, the terms and conditions of
this Agreement shall control.

          (b) Notice of Issuance, Amendment, Renewal, Extension; Certain
Conditions. To request the issuance of a Letter of Credit (or the amendment,
renewal or extension of an outstanding Letter of Credit), the Borrower shall
hand deliver or telecopy (or transmit by electronic communication, if
arrangements for doing so have been approved by the Issuing Bank) to the Issuing
Bank and the Administrative Agent (not less than three (3) Business Days in
advance of the requested date of issuance, amendment, renewal or extension) a
notice:

               (i) requesting the issuance of a Letter of Credit or identifying
the Letter of Credit to be amended, renewed or extended;

               (ii) specifying the date of issuance, amendment, renewal or
extension (which shall be a Business Day);


                                       30

<PAGE>

               (iii) specifying the date on which such Letter of Credit is to
expire (which shall comply with Section 2.08(c));

               (iv) specifying the amount of such Letter of Credit;

               (v) specifying the name and address of the beneficiary thereof
and such other information as shall be necessary to prepare, amend, renew or
extend such Letter of Credit; and

               (vi) specifying the amount of the then effective Borrowing Base,
the current total Revolving Credit Exposures (without regard to the requested
Letter of Credit or the requested amendment, renewal or extension of an
outstanding Letter of Credit) and the pro forma total Revolving Credit Exposures
(giving effect to the requested Letter of Credit or the requested amendment,
renewal or extension of an outstanding Letter of Credit).

Each notice shall constitute a representation that after giving effect to the
requested issuance, amendment, renewal or extension, as applicable, (i) the LC
Exposure shall not exceed the LC Commitment and (ii) the total Revolving Credit
Exposures shall not exceed the total Commitments (i.e. the lesser of the
Aggregate Maximum Credit Amounts and the then effective Borrowing Base).

If requested by the Issuing Bank, the Borrower also shall submit a letter of
credit application on the Issuing Bank's standard form in connection with any
request for a Letter of Credit.

          (c) Expiration Date. Each Letter of Credit shall expire at or prior to
the close of business on the earlier of (i) the date one year after the date of
the issuance of such Letter of Credit (or, in the case of any renewal or
extension thereof, one year after such renewal or extension) and (ii) the date
that is five Business Days prior to the Maturity Date.

          (d) Participations. By the issuance of a Letter of Credit (or an
amendment to a Letter of Credit increasing the amount thereof) and without any
further action on the part of the Issuing Bank or the Lenders, the Issuing Bank
hereby grants to each Lender, and each Lender hereby acquires from the Issuing
Bank, a participation in such Letter of Credit equal to such Lender's Applicable
Percentage of the aggregate amount available to be drawn under such Letter of
Credit. In consideration and in furtherance of the foregoing, each Lender hereby
absolutely and unconditionally agrees to pay to the Administrative Agent, for
the account of the Issuing Bank, such Lender's Applicable Percentage of each LC
Disbursement made by the Issuing Bank and not reimbursed by the Borrower on the
date due as provided in Section 2.08(e), or of any reimbursement payment
required to be refunded to the Borrower for any reason. Each Lender acknowledges
and agrees that its obligation to acquire participations pursuant to this
Section 2.08(d) in respect of Letters of Credit is absolute and unconditional
and shall not be affected by any circumstance whatsoever, including any
amendment, renewal or extension of any Letter of Credit or the occurrence and
continuance of a Default or reduction or termination of the Commitments, and
that each such payment shall be made without any offset, abatement, withholding
or reduction whatsoever.

          (e) Reimbursement. If the Issuing Bank shall make any LC Disbursement
in respect of a Letter of Credit, the Borrower shall reimburse such LC
Disbursement by paying to


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<PAGE>

the Administrative Agent an amount equal to such LC Disbursement not later than
12:00 noon, New York City time, on the date that such LC Disbursement is made,
if the Borrower shall have received notice of such LC Disbursement prior to
10:00 a.m., New York City time, on such date, or, if such notice has not been
received by the Borrower prior to such time on such date, then not later than
12:00 noon, New York City time, on (i) the Business Day that the Borrower
receives such notice, if such notice is received prior to 10:00 a.m., New York
City time, on the day of receipt, or (ii) the Business Day immediately following
the day that the Borrower receives such notice, if such notice is not received
prior to such time on the day of receipt; provided that if such LC Disbursement
is equal to or greater than $1,000,000, the Borrower shall, subject to the
conditions to Borrowing set forth herein, be deemed to have requested, and the
Borrower does hereby request under such circumstances, that such LC Disbursement
be financed with an ABR Borrowing in an equivalent amount and, to the extent so
financed, the Borrower's obligation to make such payment shall be discharged and
replaced by the resulting ABR Borrowing. If the Borrower fails to make such
payment when due, the Administrative Agent shall notify each Lender of the
applicable LC Disbursement, the payment then due from the Borrower in respect
thereof and such Lender's Applicable Percentage thereof. Promptly following
receipt of such notice, each Lender shall pay to the Administrative Agent its
Applicable Percentage of the payment then due from the Borrower, in the same
manner as provided in Section 2.05 with respect to Loans made by such Lender
(and Section 2.05 shall apply, mutatis mutandis, to the payment obligations of
the Lenders), and the Administrative Agent shall promptly pay to the Issuing
Bank the amounts so received by it from the Lenders. Promptly following receipt
by the Administrative Agent of any payment from the Borrower pursuant to this
Section 2.08(e), the Administrative Agent shall distribute such payment to the
Issuing Bank or, to the extent that Lenders have made payments pursuant to this
Section 2.08(e) to reimburse the Issuing Bank, then to such Lenders and the
Issuing Bank as their interests may appear. Any payment made by a Lender
pursuant to this Section 2.08(e) to reimburse the Issuing Bank for any LC
Disbursement (other than the funding of ABR Loans as contemplated above) shall
not constitute a Loan and shall not relieve the Borrower of its obligation to
reimburse such LC Disbursement.

          (f) Obligations Absolute. The Borrower's obligation to reimburse LC
Disbursements as provided in Section 2.08(e) shall be absolute, unconditional
and irrevocable, and shall be performed strictly in accordance with the terms of
this Agreement under any and all circumstances whatsoever and irrespective of
(i) any lack of validity or enforceability of any Letter of Credit, any Letter
of Credit Agreement or this Agreement, or any term or provision therein, (ii)
any draft or other document presented under a Letter of Credit proving to be
forged, fraudulent or invalid in any respect or any statement therein being
untrue or inaccurate in any respect, (iii) payment by the Issuing Bank under a
Letter of Credit against presentation of a draft or other document that does not
comply substantially with the terms of such Letter of Credit or any Letter of
Credit Agreement, or (iv) any other event or circumstance whatsoever, whether or
not similar to any of the foregoing, that might, but for the provisions of this
Section 2.08(f), constitute a legal or equitable discharge of, or provide a
right of setoff against, the Borrower's obligations hereunder. Neither the
Administrative Agent, the Lenders nor the Issuing Bank, nor any of their Related
Parties shall have any liability or responsibility by reason of or in connection
with the issuance or transfer of any Letter of Credit or any payment or failure
to make any payment thereunder (irrespective of any of the circumstances
referred to in the preceding sentence), or any error, omission, interruption,
loss or delay in transmission or delivery of any draft, notice or other
communication under or relating to any Letter of Credit (including any


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<PAGE>

document required to make a drawing thereunder), any error in interpretation of
technical terms or any consequence arising from causes beyond the control of the
Issuing Bank; provided that the foregoing shall not be construed to excuse the
Issuing Bank from liability to the Borrower to the extent of any direct damages
(as opposed to consequential damages, claims in respect of which are hereby
waived by the Borrower to the extent permitted by applicable law) suffered by
the Borrower that are caused by the Issuing Bank's failure to exercise care when
determining whether drafts and other documents presented under a Letter of
Credit comply with the terms thereof. The parties hereto expressly agree that,
in the absence of gross negligence or willful misconduct on the part of the
Issuing Bank (as finally determined by a court of competent jurisdiction), the
Issuing Bank shall be deemed to have exercised all requisite care in each such
determination. In furtherance of the foregoing and without limiting the
generality thereof, the parties agree that, with respect to documents presented
which appear on their face to be in substantial compliance with the terms of a
Letter of Credit, the Issuing Bank may, in its reasonable discretion, either
accept and make payment upon such documents without responsibility for further
investigation, or refuse to accept and make payment upon such documents if such
documents are not in strict compliance with the terms of such Letter of Credit.

          (g) Disbursement Procedures. The Issuing Bank shall, promptly
following its receipt thereof, examine all documents purporting to represent a
demand for payment under a Letter of Credit. The Issuing Bank shall promptly
notify the Administrative Agent and the Borrower by telephone (confirmed by
telecopy) of such demand for payment and whether the Issuing Bank has made or
will make an LC Disbursement thereunder; provided that any failure to give or
delay in giving such notice shall not relieve the Borrower of its obligation to
reimburse the Issuing Bank and the Lenders with respect to any such LC
Disbursement.

          (h) Interim Interest. If the Issuing Bank shall make any LC
Disbursement, then, until the Borrower shall have reimbursed the Issuing Bank
for such LC Disbursement (either with its own funds or a Borrowing under Section
2.08(e)), the unpaid amount thereof shall bear interest, for each day from and
including the date such LC Disbursement is made to but excluding the date that
the Borrower reimburses such LC Disbursement, at the rate per annum then
applicable to ABR Loans. Interest accrued pursuant to this Section 2.08(h) shall
be for the account of the Issuing Bank, except that interest accrued on and
after the date of payment by any Lender pursuant to Section 2.08(e) to reimburse
the Issuing Bank shall be for the account of such Lender to the extent of such
payment.

          (i) Replacement of the Issuing Bank. The Issuing Bank may be replaced
at any time by written agreement among the Borrower, the Administrative Agent,
the replaced Issuing Bank and the successor Issuing Bank. The Administrative
Agent shall notify the Lenders of any such replacement of the Issuing Bank. At
the time any such replacement shall become effective, the Borrower shall pay all
unpaid fees accrued for the account of the replaced Issuing Bank pursuant to
Section 3.05(b). From and after the effective date of any such replacement, (i)
the successor Issuing Bank shall have all the rights and obligations of the
Issuing Bank under this Agreement with respect to Letters of Credit to be issued
thereafter and (ii) references herein to the term "Issuing Bank" shall be deemed
to refer to such successor or to any previous Issuing Bank, or to such successor
and all previous Issuing Banks, as the context shall require. After the
replacement of the Issuing Bank hereunder, the replaced Issuing Bank shall
remain a party hereto and shall continue to have all the rights and obligations
of the Issuing Bank under this


                                       33

<PAGE>

Agreement with respect to Letters of Credit issued by it prior to such
replacement, but shall not be required to issue additional Letters of Credit.

          (j) Cash Collateralization. If (i) any Event of Default shall occur
and be continuing and the Borrower receives notice from the Administrative Agent
or the Majority Lenders demanding the deposit of cash collateral pursuant to
this Section 2.08(j), or (ii) the Borrower is required to pay to the
Administrative Agent the excess attributable to an LC Exposure in connection
with any prepayment pursuant to Section 3.04(c), then the Borrower shall
deposit, in an account with the Administrative Agent, in the name of the
Administrative Agent and for the benefit of the Lenders, an amount in cash equal
to, in the case of an Event of Default, the LC Exposure, and in the case of a
payment required by Section 3.04(c), the amount of such excess as provided in
Section 3.04(c), as of such date plus any accrued and unpaid interest thereon;
provided that the obligation to deposit such cash collateral shall become
effective immediately, and such deposit shall become immediately due and
payable, without demand or other notice of any kind, upon the occurrence of any
Event of Default with respect to the Borrower or any Restricted Subsidiary
described in Section 10.01(h) or Section 10.01(i). The Borrower hereby grants to
the Administrative Agent, for the benefit of the Issuing Bank and the Lenders,
an exclusive first priority and continuing perfected security interest in and
Lien on such account and all cash, checks, drafts, certificates and instruments,
if any, from time to time deposited or held in such account, all deposits or
wire transfers made thereto, any and all investments purchased with funds
deposited in such account, all interest, dividends, cash, instruments, financial
assets and other Property from time to time received, receivable or otherwise
payable in respect of, or in exchange for, any or all of the foregoing, and all
proceeds, products, accessions, rents, profits, income and benefits therefrom,
and any substitutions and replacements therefor. The Borrower's obligation to
deposit amounts pursuant to this Section 2.08(j) shall be absolute and
unconditional, without regard to whether any beneficiary of any such Letter of
Credit has attempted to draw down all or a portion of such amount under the
terms of a Letter of Credit, and, to the fullest extent permitted by applicable
law, shall not be subject to any defense or be affected by a right of set-off,
counterclaim or recoupment which the Borrower or any of its Subsidiaries may now
or hereafter have against any such beneficiary, the Issuing Bank, the
Administrative Agent, the Lenders or any other Person for any reason whatsoever.
Such deposit shall be held as collateral securing the payment and performance of
the Borrower's and the Guarantor's obligations under this Agreement and the
other Loan Documents. The Administrative Agent shall have exclusive dominion and
control, including the exclusive right of withdrawal, over such account.
Interest, if any, on such deposit shall accumulate in such account. Moneys in
such account shall be applied by the Administrative Agent to reimburse the
Issuing Bank for LC Disbursements for which it has not been reimbursed and, to
the extent not so applied, shall be held for the satisfaction of the
reimbursement obligations of the Borrower for the LC Exposure at such time or,
if the maturity of the Loans has been accelerated, be applied to satisfy other
obligations of the Borrower and the Guarantors under this Agreement or the other
Loan Documents. If the Borrower is required to provide an amount of cash
collateral hereunder as a result of the occurrence of an Event of Default, and
the Borrower is not otherwise required to pay to the Administrative Agent the
excess attributable to an LC Exposure in connection with any prepayment pursuant
to Section 3.04(c), then such amount (to the extent not applied as aforesaid)
shall be returned to the Borrower within three Business Days after all Events of
Default have been cured or waived.


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<PAGE>

                                   ARTICLE III
              PAYMENTS OF PRINCIPAL AND INTEREST; PREPAYMENTS; FEES

     Section 3.01 Repayment of Loans. The Borrower hereby unconditionally
promises to pay to the Administrative Agent for the account of each Lender the
then unpaid principal amount of each Loan on the Termination Date.

     Section 3.02 Interest.

          (a) ABR Loans. The Loans comprising each ABR Borrowing shall bear
interest at the Alternate Base Rate plus the Applicable Margin, but in no event
to exceed the Highest Lawful Rate.

          (b) Eurodollar Loans. The Loans comprising each Eurodollar Borrowing
shall bear interest at the Adjusted LIBO Rate for the Interest Period in effect
for such Borrowing plus the Applicable Margin, but in no event to exceed the
Highest Lawful Rate.

          (c) Post-Default Rate. Notwithstanding the foregoing, if any principal
of or interest on any Loan or any fee or other amount payable by the Borrower or
any Guarantor hereunder or under any other Loan Document is not paid when due,
whether at stated maturity, upon acceleration or otherwise, such overdue amount
shall bear interest, after as well as before judgment, at a rate per annum equal
to two percent (2%) plus the rate applicable to ABR Loans as provided in Section
3.02(a), but in no event to exceed the Highest Lawful Rate.

          (d) Interest Payment Dates. Accrued interest on each Loan shall be
payable in arrears on each Interest Payment Date for such Loan and on the
Termination Date; provided that (i) interest accrued pursuant to Section 3.02(c)
shall be payable on demand, (ii) in the event of any repayment or prepayment of
any Loan (other than an optional prepayment of an ABR Loan prior to the
Termination Date), accrued interest on the principal amount repaid or prepaid
shall be payable on the date of such repayment or prepayment, and (iii) in the
event of any conversion of any Eurodollar Loan prior to the end of the current
Interest Period therefor, accrued interest on such Loan shall be payable on the
effective date of such conversion.

          (e) Interest Rate Computations. All interest hereunder shall be
computed on the basis of a year of 360 days, unless such computation would
exceed the Highest Lawful Rate, in which case interest shall be computed on the
basis of a year of 365 days (or 366 days in a leap year), except that interest
computed by reference to the Alternate Base Rate at times when the Alternate
Base Rate is based on the Prime Rate shall be computed on the basis of a year of
365 days (or 366 days in a leap year), and in each case shall be payable for the
actual number of days elapsed (including the first day but excluding the last
day). The applicable Alternate Base Rate, Adjusted LIBO Rate or LIBO Rate shall
be determined by the Administrative Agent, and such determination shall be
conclusive absent manifest error, and be binding upon the parties hereto.

     Section 3.03 Alternate Rate of Interest. If prior to the commencement of
any Interest Period for a Eurodollar Borrowing:


                                       35

<PAGE>

          (a) the Administrative Agent determines (which determination shall be
conclusive absent manifest error) that adequate and reasonable means do not
exist for ascertaining the Adjusted LIBO Rate or the LIBO Rate for such Interest
Period; or

          (b) the Administrative Agent is advised by the Majority Lenders that
the Adjusted LIBO Rate or LIBO Rate, as applicable, for such Interest Period
will not adequately and fairly reflect the cost to such Lenders of making or
maintaining their Loans included in such Borrowing for such Interest Period;

then the Administrative Agent shall give notice thereof to the Borrower and the
Lenders by telephone or telecopy as promptly as practicable thereafter and,
until the Administrative Agent notifies the Borrower and the Lenders that the
circumstances giving rise to such notice no longer exist, (i) any Interest
Election Request that requests the conversion of any Borrowing to, or
continuation of any Borrowing as, a Eurodollar Borrowing shall be ineffective,
and (ii) if any Borrowing Request requests a Eurodollar Borrowing, such
Borrowing shall be made as an ABR Borrowing.

     Section 3.04 Prepayments.

          (a) Optional Prepayments. The Borrower shall have the right at any
time and from time to time to prepay any Borrowing in whole or in part, subject
to prior notice in accordance with Section 3.04(b).

          (b) Notice and Terms of Optional Prepayment. The Borrower shall notify
the Administrative Agent by telephone and/or fax (confirmed by telecopy) of any
prepayment hereunder (i) in the case of prepayment of a Eurodollar Borrowing,
not later than 12:00 noon, New York City time, three Business Days before the
date of prepayment, or (ii) in the case of prepayment of an ABR Borrowing, not
later than 12:00 noon, New York City time, on the date of prepayment. Each such
notice shall be irrevocable and shall specify the prepayment date and the
principal amount of each Borrowing or portion thereof to be prepaid. Promptly
following receipt of any such notice relating to a Borrowing, the Administrative
Agent shall advise the Lenders of the contents thereof. Each partial prepayment
of any Borrowing shall be in an amount that would be permitted in the case of an
advance of a Borrowing of the same Type as provided in Section 2.02. Each
prepayment of a Borrowing shall be applied ratably to the Loans included in the
prepaid Borrowing. Prepayments shall be accompanied by accrued interest to the
extent required by Section 3.02.

          (c) Mandatory Prepayments.

               (i) If, after giving effect to any termination or reduction of
the Aggregate Maximum Credit Amounts pursuant to Section 2.06(b), the total
Revolving Credit Exposures exceeds the total Commitments, then the Borrower
shall (A) prepay the Borrowings on the date of such termination or reduction in
an aggregate principal amount equal to such excess, and (B) if any excess
remains after prepaying all of the Borrowings as a result of an LC Exposure, pay
to the Administrative Agent on behalf of the Lenders an amount equal to such
excess to be held as cash collateral as provided in Section 2.08(j).


                                       36

<PAGE>

               (ii) Upon any redetermination of or adjustment to the amount of
the Borrowing Base in accordance with Section 2.07 or Section 8.13(c), if the
total Revolving Credit Exposures exceeds the redetermined or adjusted Borrowing
Base, then the Borrower shall (A) prepay the Borrowings in an aggregate
principal amount equal to such excess, and (B) if any excess remains after
prepaying all of the Borrowings as a result of an LC Exposure, pay to the
Administrative Agent on behalf of the Lenders an amount equal to such excess to
be held as cash collateral as provided in Section 2.08(j). The Borrower shall be
obligated to make such prepayment and/or deposit of cash collateral within
forty-five (45) days following its receipt of the New Borrowing Base Notice in
accordance with Section 2.07(d) or the date the adjustment occurs; provided that
all payments required to be made pursuant to this Section 3.04(c)(ii) must be
made on or prior to the Termination Date.

               (iii) Upon any adjustments to the Borrowing Base pursuant to
Section 9.13, if the total Revolving Credit Exposures exceeds the Borrowing Base
as adjusted, then the Borrower shall (A) prepay the Borrowings in an aggregate
principal amount equal to such excess, and (B) if any excess remains after
prepaying all of the Borrowings as a result of an LC Exposure, pay to the
Administrative Agent on behalf of the Lenders an amount equal to such excess to
be held as cash collateral as provided in Section 2.08(j). The Borrower shall be
obligated to make such prepayment and/or deposit of cash collateral on the date
it or any Subsidiary receives cash proceeds as a result of such disposition;
provided that all payments required to be made pursuant to this Section
3.04(c)(iii) must be made on or prior to the Termination Date.

               (iv) Each prepayment of Borrowings pursuant to this Section
3.04(c) shall be applied, first, ratably to any ABR Borrowings then outstanding,
and, second, to any Eurodollar Borrowings then outstanding, and if more than one
Eurodollar Borrowing is then outstanding, to each such Eurodollar Borrowing in
order of priority beginning with the Eurodollar Borrowing with the least number
of days remaining in the Interest Period applicable thereto and ending with the
Eurodollar Borrowing with the most number of days remaining in the Interest
Period applicable thereto.

               (v) Each prepayment of Borrowings pursuant to this Section
3.04(c) shall be applied ratably to the Loans included in the prepaid
Borrowings. Prepayments pursuant to this Section 3.04(c) shall be accompanied by
accrued interest to the extent required by Section 3.02.

          (d) No Premium or Penalty. Prepayments permitted or required under
this Section 3.04 shall be without premium or penalty, except as required under
Section 5.02.

     Section 3.05 Fees.

          (a) Commitment Fees. The Borrower agrees to pay to the Administrative
Agent for the account of each Lender a commitment fee, which shall accrue at the
applicable Commitment Fee Rate on the average daily amount of the unused amount
of the Commitment of such Lender during the period from and including the date
of this Agreement to but excluding the Termination Date. Accrued commitment fees
shall be payable in arrears on the last day of March, June, September and
December of each year and on the Termination Date, commencing


                                       37

<PAGE>

on the first such date to occur after the date hereof. All commitment fees shall
be computed on the basis of a year of 365 days, unless such computation would
exceed the Highest Lawful Rate, in which case interest shall be computed on the
basis of a year of 365 days (or 366 days in a leap year), and shall be payable
for the actual number of days elapsed (including the first day but excluding the
last day).

          (b) Letter of Credit Fees. The Borrower agrees to pay (i) to the
Administrative Agent for the account of each Lender a participation fee with
respect to its participations in Letters of Credit, which shall accrue at the
same Applicable Margin used to determine the interest rate applicable to
Eurodollar Loans on the average daily amount of such Lender's LC Exposure
(excluding any portion thereof attributable to unreimbursed LC Disbursements)
during the period from and including the date of this Agreement to but excluding
the later of the date on which such Lender's Commitment terminates and the date
on which such Lender ceases to have any LC Exposure, (ii) to the Issuing Bank a
fronting fee, which shall accrue at the rate of 0.125% per annum on the average
daily amount of the LC Exposure (excluding any portion thereof attributable to
unreimbursed LC Disbursements) during the period from and including the date of
this Agreement to but excluding the later of the date of termination of the
Commitments and the date on which there ceases to be any LC Exposure, provided
that in no event shall such fee be less than $125 during any quarter, and (iii)
to the Issuing Bank, for its own account, its standard fees with respect to the
issuance, amendment, renewal or extension of any Letter of Credit or processing
of drawings thereunder. Participation fees and fronting fees accrued through and
including the last day of March, June, September and December of each year shall
be payable on the third Business Day following such last day, commencing on the
first such date to occur after the date of this Agreement; provided that all
such fees shall be payable on the Termination Date and any such fees accruing
after the Termination Date shall be payable on demand. Any other fees payable to
the Issuing Bank pursuant to this Section 3.05(b) shall be payable within 10
days after demand. All participation fees and fronting fees shall be computed on
the basis of a year of 360 days, unless such computation would exceed the
Highest Lawful Rate, in which case interest shall be computed on the basis of a
year of 365 days (or 366 days in a leap year), and shall be payable for the
actual number of days elapsed (including the first day but excluding the last
day).

          (c) Administrative Agent Fees. The Borrower agrees to pay to the
Administrative Agent, for its own account, fees payable in the amounts and at
the times separately agreed upon between the Borrower and the Administrative
Agent.

                                   ARTICLE IV
                PAYMENTS; PRO RATA TREATMENT; SHARING OF SET-OFFS

     Section 4.01 Payments Generally; Pro Rata Treatment; Sharing of Set-offs.

          (a) Payments by the Borrower. The Borrower shall make each payment
required to be made by it hereunder (whether of principal, interest, fees or
reimbursement of LC Disbursements, or of amounts payable under Section 5.01,
Section 5.02, Section 5.03 or otherwise) prior to 12:00 noon, New York City
time, on the date when due, in immediately available funds, without defense,
deduction, recoupment, set-off or counterclaim. Fees, once paid, shall not be
refundable under any circumstances. Any amounts received after such time on any
date may, in the discretion of the Administrative Agent, be deemed to have been
received on


                                       38

<PAGE>

the next succeeding Business Day for purposes of calculating interest thereon,
but shall be considered received on the date paid for purposes of Section 10.01.
All such payments shall be made to the Administrative Agent at its offices
specified in Section 12.01, except payments to be made directly to the Issuing
Bank as expressly provided herein and except that payments pursuant to Section
5.01, Section 5.02, Section 5.03 and Section 12.03 shall be made directly to the
Persons entitled thereto. The Administrative Agent shall distribute any such
payments received by it for the account of any other Person to the appropriate
recipient promptly following receipt thereof. If any payment hereunder shall be
due on a day that is not a Business Day, the date for payment shall be extended
to the next succeeding Business Day, and, in the case of any payment accruing
interest, interest thereon shall be payable for the period of such extension.
All payments hereunder shall be made in dollars.

          (b) Application of Insufficient Payments. If at any time insufficient
funds are received by and available to the Administrative Agent to pay fully all
amounts of principal, unreimbursed LC Disbursements, interest and fees then due
hereunder, such funds shall be applied (i) first, towards payment of interest
and fees then due hereunder, ratably among the parties entitled thereto in
accordance with the amounts of interest and fees then due to such parties, and
(ii) second, towards payment of principal and unreimbursed LC Disbursements then
due hereunder, ratably among the parties entitled thereto in accordance with the
amounts of principal and unreimbursed LC Disbursements then due to such parties.

          (c) Sharing of Payments by Lenders. If any Lender shall, by exercising
any right of set-off or counterclaim or otherwise, obtain payment in respect of
any principal of or interest on any of its Loans or participations in LC
Disbursements resulting in such Lender receiving payment of a greater proportion
of the aggregate amount of its Loans and participations in LC Disbursements and
accrued interest thereon than the proportion received by any other Lender, then
the Lender receiving such greater proportion shall purchase (for cash at face
value) participations in the Loans and participations in LC Disbursements of
other Lenders to the extent necessary so that the benefit of all such payments
shall be shared by the Lenders ratably in accordance with the aggregate amount
of principal of and accrued interest on their respective Loans and
participations in LC Disbursements; provided that (i) if any such participations
are purchased and all or any portion of the payment giving rise thereto is
recovered, such participations shall be rescinded and the purchase price
restored to the extent of such recovery, without interest, and (ii) the
provisions of this Section 4.01(c) shall not be construed to apply to any
payment made by the Borrower pursuant to and in accordance with the express
terms of this Agreement or any payment obtained by a Lender as consideration for
the assignment of or sale of a participation in any of its Loans or
participations in LC Disbursements to any assignee or participant, other than to
the Borrower or any Subsidiary or Affiliate thereof (as to which the provisions
of this Section 4.01(c) shall apply). The Borrower consents to the foregoing and
agrees, to the extent it may effectively do so under applicable law, that any
Lender acquiring a participation pursuant to the foregoing arrangements may
exercise against the Borrower rights of set-off and counterclaim with respect to
such participation as fully as if such Lender were a direct creditor of the
Borrower in the amount of such participation.

     Section 4.02 Presumption of Payment by the Borrower. Unless the
Administrative Agent shall have received notice from the Borrower prior to the
date on which any payment is due to the Administrative Agent for the account of
the Lenders or the Issuing Bank that the


                                       39

<PAGE>

Borrower will not make such payment, the Administrative Agent may assume that
the Borrower has made such payment on such date in accordance herewith and may,
in reliance upon such assumption, distribute to the Lenders or the Issuing Bank,
as the case may be, the amount due. In such event, if the Borrower has not in
fact made such payment, then each of the Lenders or the Issuing Bank, as the
case may be, severally agrees to repay to the Administrative Agent forthwith on
demand the amount so distributed to such Lender or Issuing Bank with interest
thereon, for each day from and including the date such amount is distributed to
it to but excluding the date of payment to the Administrative Agent, at the
greater of the Federal Funds Effective Rate and a rate determined by the
Administrative Agent in accordance with banking industry rules on interbank
compensation.

     Section 4.03 Certain Deductions by the Administrative Agent. If any Lender
shall fail to make any payment required to be made by it pursuant to Section
2.05(b), Section 2.08(d), Section 2.08(e) or Section 4.02 then the
Administrative Agent may, in its discretion (notwithstanding any contrary
provision hereof), apply any amounts thereafter received by the Administrative
Agent for the account of such Lender to satisfy such Lender's obligations under
such Sections until all such unsatisfied obligations are fully paid.

     Section 4.04 Disposition of Proceeds. The Security Instruments contain an
assignment by the Borrower and/or the Guarantors unto and in favor of the
Administrative Agent for the benefit of the Lenders of all of the Borrower's or
each Guarantor's interest in and to production and all proceeds attributable
thereto which may be produced from or allocated to the Mortgaged Property. The
Security Instruments further provide in general for the application of such
proceeds to the satisfaction of the Indebtedness and other obligations described
therein and secured thereby. Notwithstanding the assignment contained in such
Security Instruments, until the occurrence of an Event of Default, (a) the
Administrative Agent and the Lenders agree that they will neither notify the
purchaser or purchasers of such production nor take any other action to cause
such proceeds to be remitted to the Administrative Agent or the Lenders, but the
Lenders will instead permit such proceeds to be paid to the Borrower and its
Restricted Subsidiaries and (b) the Lenders hereby authorize the Administrative
Agent to take such actions as may be necessary to cause such proceeds to be paid
to the Borrower and/or such Restricted Subsidiaries.

                                    ARTICLE V
           INCREASED COSTS; BREAK FUNDING PAYMENTS; TAXES; ILLEGALITY

     Section 5.01 Increased Costs.

          (a) Eurodollar Changes in Law. If any Change in Law shall:

               (i) impose, modify or deem applicable any reserve, special
deposit or similar requirement against assets of, deposits with or for the
account of, or credit extended by, any Lender (except any such reserve
requirement reflected in the Adjusted LIBO Rate); or

               (ii) impose on any Lender or the London interbank market any
other condition affecting this Agreement or Eurodollar Loans made by such
Lender;


                                       40

<PAGE>

and the result of any of the foregoing shall be to increase the cost to such
Lender of making or maintaining any Eurodollar Loan (or of maintaining its
obligation to make any such Loan) or to reduce the amount of any sum received or
receivable by such Lender (whether of principal, interest or otherwise), then
the Borrower will pay to such Lender such additional amount or amounts as will
compensate such Lender for such additional costs incurred or reduction suffered.

          (b) Capital Requirements. If any Lender or the Issuing Bank determines
that any Change in Law regarding capital requirements has or would have the
effect of reducing the rate of return on such Lender's or the Issuing Bank's
capital or on the capital of such Lender's or the Issuing Bank's holding
company, if any, as a consequence of this Agreement or the Loans made by, or
participations in Letters of Credit held by, such Lender, or the Letters of
Credit issued by the Issuing Bank, to a level below that which such Lender or
the Issuing Bank or such Lender's or the Issuing Bank's holding company could
have achieved but for such Change in Law (taking into consideration such
Lender's or the Issuing Bank's policies and the policies of such Lender's or the
Issuing Bank's holding company with respect to capital adequacy), then from time
to time the Borrower will pay to such Lender or the Issuing Bank, as the case
may be, such additional amount or amounts as will compensate such Lender or the
Issuing Bank or such Lender's or the Issuing Bank's holding company for any such
reduction suffered.

          (c) Certificates. A certificate of a Lender or the Issuing Bank
setting forth the amount or amounts necessary to compensate such Lender or the
Issuing Bank or its holding company, as the case may be, as specified in Section
5.01(a) or (b) shall be delivered to the Borrower and shall be conclusive absent
manifest error. The Borrower shall pay such Lender or the Issuing Bank, as the
case may be, the amount shown as due on any such certificate within 10 days
after receipt thereof.

          (d) Effect of Failure or Delay in Requesting Compensation. Failure or
delay on the part of any Lender or the Issuing Bank to demand compensation
pursuant to this Section 5.01 shall not constitute a waiver of such Lender's or
the Issuing Bank's right to demand such compensation; provided that the Borrower
shall not be required to compensate a Lender or the Issuing Bank pursuant to
this Section 5.01 for any increased costs or reductions incurred more than 180
days prior to the date that such Lender or the Issuing Bank, as the case may be,
notifies the Borrower of the Change in Law giving rise to such increased costs
or reductions and of such Lender's or the Issuing Bank's intention to claim
compensation therefor; provided further that, if the Change in Law giving rise
to such increased costs or reductions is retroactive, then the 180-day period
referred to above shall be extended to include the period of retroactive effect
thereof.

     Section 5.02 Break Funding Payments. In the event of (a) the payment of any
principal of any Eurodollar Loan other than on the last day of an Interest
Period applicable thereto (including as a result of an Event of Default), (b)
the conversion of any Eurodollar Loan into an ABR Loan other than on the last
day of the Interest Period applicable thereto, or (c) the failure to borrow,
convert, continue or prepay any Eurodollar Loan on the date specified in any
notice delivered pursuant hereto, or (d) the assignment of any Eurodollar Loan
other than on the last day of the Interest Period applicable thereto as a result
of a request by the Borrower pursuant to Section 5.04(b), then, in any such
event, the Borrower shall compensate each Lender for the loss, cost and expense
attributable to such event. In the case of a Eurodollar Loan, such loss, cost or
expense to any Lender shall be deemed to include an amount determined by such
Lender to be


                                       41

<PAGE>

the excess, if any, of (i) the amount of interest which would have accrued on
the principal amount of such Loan had such event not occurred, at the Adjusted
LIBO Rate that would have been applicable to such Loan, for the period from the
date of such event to the last day of the then current Interest Period therefor
(or, in the case of a failure to borrow, convert or continue, for the period
that would have been the Interest Period for such Loan), over (ii) the amount of
interest which would accrue on such principal amount for such period at the
interest rate which such Lender would bid were it to bid, at the commencement of
such period, for dollar deposits of a comparable amount and period from other
banks in the eurodollar market.

A certificate of any Lender setting forth any amount or amounts that such Lender
is entitled to receive pursuant to this Section 5.02 shall be delivered to the
Borrower and shall be conclusive absent manifest error. The Borrower shall pay
such Lender the amount shown as due on any such certificate within 10 days after
receipt thereof.

     Section 5.03 Taxes.

          (a) Payments Free of Taxes. Any and all payments by or on account of
any obligation of the Borrower or any Guarantor under any Loan Document shall be
made free and clear of and without deduction for any Indemnified Taxes or Other
Taxes; provided that if the Borrower or any Guarantor shall be required to
deduct any Indemnified Taxes or Other Taxes from such payments, then (i) the sum
payable shall be increased as necessary so that after making all required
deductions (including deductions applicable to additional sums payable under
this Section 5.03), the Administrative Agent, Lender or Issuing Bank (as the
case may be) receives an amount equal to the sum it would have received had no
such deductions been made, (ii) the Borrower or such Guarantor shall make such
deductions and (iii) the Borrower or such Guarantor shall pay the full amount
deducted to the relevant Governmental Authority in accordance with applicable
law.

          (b) Payment of Other Taxes by the Borrower. The Borrower shall pay any
Other Taxes to the relevant Governmental Authority in accordance with applicable
law.

          (c) Indemnification by the Borrower. The Borrower shall indemnify the
Administrative Agent, each Lender and the Issuing Bank, within 10 days after
written demand therefor, for the full amount of any Indemnified Taxes or Other
Taxes paid by the Administrative Agent, such Lender or the Issuing Bank, as the
case may be, on or with respect to any payment by or on account of any
obligation of the Borrower hereunder (including Indemnified Taxes or Other Taxes
imposed or asserted on or attributable to amounts payable under this Section
5.03) and any penalties, interest and reasonable expenses arising therefrom or
with respect thereto, whether or not such Indemnified Taxes or Other Taxes were
correctly or legally imposed or asserted by the relevant Governmental Authority.
A certificate of the Administrative Agent, a Lender or the Issuing Bank as to
the amount of such payment or liability under this Section 5.03 shall be
delivered to the Borrower and shall be conclusive absent manifest error.

          (d) Evidence of Payments. As soon as practicable after any payment of
Indemnified Taxes or Other Taxes by the Borrower or a Guarantor to a
Governmental Authority, the Borrower shall deliver to the Administrative Agent
the original or a certified copy of a receipt issued by such Governmental
Authority evidencing such payment, a copy of the return


                                       42

<PAGE>

reporting such payment or other evidence of such payment reasonably satisfactory
to the Administrative Agent.

          (e) Foreign Lenders. Any Foreign Lender that is entitled to an
exemption from or reduction of withholding tax under the law of the jurisdiction
in which the Borrower is located, or any treaty to which such jurisdiction is a
party, with respect to payments under this Agreement or any other Loan Document
shall deliver to the Borrower (with a copy to the Administrative Agent), at the
time or times prescribed by applicable law, such properly completed and executed
documentation prescribed by applicable law or reasonably requested by the
Borrower as will permit such payments to be made without withholding or at a
reduced rate.

     Section 5.04 Mitigation Obligations; Replacement of Lenders.

          (a) Designation of Different Lending Office. If any Lender requests
compensation under Section 5.01, or if the Borrower is required to pay any
additional amount to any Lender or any Governmental Authority for the account of
any Lender pursuant to Section 5.03, then such Lender shall use reasonable
efforts to designate a different lending office for funding or booking its Loans
hereunder or to assign its rights and obligations hereunder to another of its
offices, branches or affiliates, if, in the judgment of such Lender, such
designation or assignment (i) would eliminate or reduce amounts payable pursuant
to Section 5.01 or Section 5.03, as the case may be, in the future and (ii)
would not subject such Lender to any unreimbursed cost or expense and would not
otherwise be disadvantageous to such Lender. The Borrower hereby agrees to pay
all reasonable costs and expenses incurred by any Lender in connection with any
such designation or assignment.

          (b) Replacement of Lenders. If any Lender requests compensation under
Section 5.01, or if the Borrower is required to pay any additional amount to any
Lender or any Governmental Authority for the account of any Lender pursuant to
Section 5.03, or if any Lender defaults in its obligation to fund Loans
hereunder, then the Borrower may, at its sole expense and effort, upon notice to
such Lender and the Administrative Agent, require such Lender to assign and
delegate, without recourse (in accordance with and subject to the restrictions
contained in Section 12.04(b)), all its interests, rights and obligations under
this Agreement to an assignee that shall assume such obligations (which assignee
may be another Lender, if a Lender accepts such assignment); provided that (i)
the Borrower shall have received the prior written consent of the Administrative
Agent, which consent shall not unreasonably be withheld, (ii) such Lender shall
have received payment of an amount equal to the outstanding principal of its
Loans and participations in LC Disbursements, accrued interest thereon, accrued
fees and all other amounts payable to it hereunder, from the assignee (to the
extent of such outstanding principal and accrued interest and fees) or the
Borrower (in the case of all other amounts) and (iii) in the case of any such
assignment resulting from a claim for compensation under Section 5.01 or
payments required to be made pursuant to Section 5.03, such assignment will
result in a reduction in such compensation or payments. A Lender shall not be
required to make any such assignment and delegation if, prior thereto, as a
result of a waiver by such Lender or otherwise, the circumstances entitling the
Borrower to require such assignment and delegation cease to apply.

     Section 5.05 Illegality. Notwithstanding any other provision of this
Agreement, in the event that it becomes unlawful for any Lender or its
applicable lending office to honor its


                                       43

<PAGE>

obligation to make or maintain Eurodollar Loans either generally or having a
particular Interest Period hereunder, then (a) such Lender shall promptly notify
the Borrower and the Administrative Agent thereof and such Lender's obligation
to make such Eurodollar Loans shall be suspended (the "Affected Loans") until
such time as such Lender may again make and maintain such Eurodollar Loans and
(b) all Affected Loans which would otherwise be made by such Lender shall be
made instead as ABR Loans (and, if such Lender so requests by notice to the
Borrower and the Administrative Agent, all Affected Loans of such Lender then
outstanding shall be automatically converted into ABR Loans on the date
specified by such Lender in such notice) and, to the extent that Affected Loans
are so made as (or converted into) ABR Loans, all payments of principal which
would otherwise be applied to such Lender's Affected Loans shall be applied
instead to its ABR Loans.

                                   ARTICLE VI
                              CONDITIONS PRECEDENT

     Section 6.01 Effective Date. The obligations of the Lenders to amend and
restate the Existing Credit Agreement, to make Loans and of the Issuing Bank to
issue Letters of Credit hereunder shall not become effective until the date on
which each of the following conditions is satisfied (or waived in accordance
with Section 12.02):

          (a) The Administrative Agent, the Arranger and the Lenders shall have
received all fees and other amounts due and payable on or prior to the Effective
Date, including, to the extent invoiced, reimbursement or payment of all
out-of-pocket expenses required to be reimbursed or paid by the Borrower
hereunder.

          (b) The Administrative Agent shall have received a certificate of the
Secretary or an Assistant Secretary of the Borrower and each Guarantor setting
forth (i) resolutions of its board of directors with respect to the
authorization of the Borrower or such Guarantor to execute and deliver the Loan
Documents to which it is a party and to enter into the transactions contemplated
in those documents, (ii) the officers of the Borrower or such Guarantor (y) who
are authorized to sign the Loan Documents to which the Borrower or such
Guarantor is a party and (z) who will, until replaced by another officer or
officers duly authorized for that purpose, act as its representative for the
purposes of signing documents and giving notices and other communications in
connection with this Agreement and the transactions contemplated hereby, (iii)
specimen signatures of such authorized officers, and (iv) the articles or
certificate of incorporation and bylaws (or other organizational documents) of
the Borrower and such Guarantor, certified as being true and complete. The
Administrative Agent and the Lenders may conclusively rely on such certificate
until the Administrative Agent receives notice in writing from the Borrower to
the contrary.

          (c) The Administrative Agent shall have received certificates of the
appropriate State agencies with respect to the existence, qualification and good
standing of the Borrower and each Guarantor.

          (d) The Administrative Agent shall have received a compliance
certificate which shall be substantially in the form of Exhibit D, duly and
properly executed by a Responsible Officer and dated as of the date of Effective
Date.


                                       44

<PAGE>

          (e) The Administrative Agent shall have received from each party
hereto counterparts (in such number as may be requested by the Administrative
Agent) of this Agreement signed on behalf of such party.

          (f) The Administrative Agent shall have received duly executed Notes,
if requested, payable to the order of each Lender in a principal amount equal to
its Maximum Credit Amount dated as of the date hereof.

          (g) The Administrative Agent shall have received from each party
thereto duly executed counterparts (in such number as may be requested by the
Administrative Agent) of the Security Instruments, including the Guaranty
Agreement and the other Security Instruments described on Exhibit F-1. In
connection with the execution and delivery of the Security Instruments, the
Administrative Agent shall:

               (i) be reasonably satisfied that the Security Instruments create
first priority, perfected Liens (subject only to Excepted Liens identified in
clauses (a) to (d) and (f) of the definition thereof, but subject to the
provisos at the end of such definition) on at least 80% of the total value of
the Oil and Gas Properties evaluated in the Initial Reserve Report;

               (ii) have received certificates, together with undated, blank
stock powers for each such certificate, representing all of the issued and
outstanding Equity Interests of each of the Guarantors and not less than 65% of
all of the issued and outstanding capital stock of each Foreign Subsidiary with
total assets in excess of $500,000 that is not a Guarantor, which is directly
owned by either the Borrower or a Domestic Subsidiary; and

               (iii) be reasonably satisfied that it has a Lien on all Property
constituting security for the Second Lien Term Loan Agreement.

          (h) The Administrative Agent shall have received a certificate of a
Responsible Officer of the Borrower certifying that (i) the Borrower shall be
contemporaneously closing the Second Lien Term Loan Agreement which shall result
in Net Cash Proceeds of $75,000,000 and unfunded commitments for an additional
$75,000,000 of term loans and (ii) attached to such certificate is a true and
complete copy of the Senior Indenture, as amended on or prior to the Effective
Date. The structure, terms, conditions and documentation, including execution
and delivery of appropriate inter-creditor and/or subordination documentation
for each of the foregoing shall be reasonably satisfactory to the Administrative
Agent.

          (i) The Administrative Agent shall have received an opinion of (i)
Hinkle Elkouri Law Firm L.L.C., special counsel to the Borrower, substantially
in the form of Exhibit E-1 hereto, and (ii) local counsel in each of the
following states: Texas, Oklahoma, New Mexico and Louisiana and any other
jurisdictions requested by the Administrative Agent, substantially in the form
of Exhibit E-2.

          (j) The Administrative Agent shall have received a certificate of
insurance coverage of the Borrower evidencing that the Borrower is carrying
insurance in accordance with Section 7.13.


                                       45

<PAGE>

          (k) The Administrative Agent shall be reasonably satisfied with the
status of title to the Oil and Gas Properties evaluated in the Initial Reserve
Report.

          (l) The Administrative Agent shall be reasonably satisfied with the
environmental condition of the Oil and Gas Properties of the Borrower and its
Restricted Subsidiaries.

          (m) The Administrative Agent shall have received a certificate of a
Responsible Officer of the Borrower certifying that the Borrower has received
all consents and approvals required by Section 7.03.

          (n) The Administrative Agent shall have received evidence satisfactory
to it that the Borrower is repaying in full and terminating the Mission Credit
Agreement, and all credit facilities and funded Debt of Mission are being repaid
and terminated, except for the Senior Unsecured Notes, contemporaneously with
the funding of the initial Loans under this Agreement, and the Administrative
Agent shall have received a certificate dated as of the Effective Date, signed
by a Responsible Officer, to that effect. The Administrative Agent shall have
received evidence satisfactory to it that all Liens associated with the Mission
Credit Agreement and all credit facilities and funded Debt of the Mission have
been released or terminated contemporaneously with the making of such payments
and that arrangements satisfactory to the Administrative Agent has been made for
recording and filing of such releases.

          (o) The Administrative Agent shall have received the financial
statements referred to in Section 7.04(a) and the Initial Reserve Report
accompanied by a certificate covering the matters described in Section 8.12(c).

          (p) The Administrative Agent shall have received appropriate UCC
search certificates reflecting no prior Liens encumbering the Properties of the
Borrower, the Restricted Subsidiaries, Mission and its Subsidiaries for each of
the following jurisdictions: Texas, Oklahoma, Louisiana and New Mexico and any
other jurisdiction requested by the Administrative Agent; other than those being
assigned or released on or prior to the Effective Date or Liens permitted by
Section 9.03.

          (q) The Administrative Agent shall have received evidence that the
Borrower or one of its Restricted Subsidiaries has purchased one or more
commodity price floors, collars or price swaps with one or more Approved
Counterparties, which have (i) a fixed price payor or floor prices acceptable to
the Administrative Agent, and (ii) aggregate notional volumes of not less than
80% during the calendar year 2005 and 2006 and 25% during calendar year 2007 and
2008 of the reasonably estimated projected crude oil production and of the
reasonably estimated projected natural gas production, in each case, from its
proved developed, producing Oil and Gas Properties as determined by reference to
the Initial Reserve Reports for each year during the period commencing with the
Effective Date and ending on December 31, 2006.

          (r) The Administrative Agent shall have received a certificate of a
Responsible Officer of the Borrower certifying that: (i) Mission and the
Borrower are concurrently consummating the Mergers in accordance with the terms
of the Merger Documents (with all of the material conditions thereto having been
satisfied in all material respects by the parties


                                       46

<PAGE>

thereto), (ii) attached thereto is a true and complete copy of each Certificate
of Merger to be filed with the Delaware Secretary of State.

          (s) The Administrative Agent shall have received a copy, certified by
a Responsible Officer as true and complete, of the Merger Documents (together
with all amendments, if any), the terms and conditions of which shall be
reasonably acceptable to the Administrative Agent.

          (t) The Administrative Agent shall have received such other documents
as the Administrative Agent or special counsel to the Administrative Agent may
reasonably request.

     The Administrative Agent shall notify the Borrower and the Lenders of the
Effective Date, and such notice shall be conclusive and binding. Notwithstanding
the foregoing, the obligations of the Lenders to make Loans and of the Issuing
Bank to issue Letters of Credit hereunder shall not become effective unless each
of the foregoing conditions is satisfied (or waived pursuant to Section 12.02)
at or prior to 2:00 p.m., New York City time, on August 31, 2005 (and, in the
event such conditions are not so satisfied or waived, the Commitments shall
terminate at such time).

     Section 6.02 Each Credit Event. The obligation of each Lender to make a
Loan on the occasion of any Borrowing (including the initial funding), and of
the Issuing Bank to issue, amend, renew or extend any Letter of Credit, is
subject to the satisfaction of the following conditions:

          (a) At the time of and immediately after giving effect to such
Borrowing or the issuance, amendment, renewal or extension of such Letter of
Credit, as applicable, no Default shall have occurred and be continuing.

          (b) At the time of and immediately after giving effect to such
Borrowing or the issuance, amendment, renewal or extension of such Letter of
Credit, as applicable, no event, development or circumstance has occurred or
shall then exist that has resulted in, or could reasonably be expected to have,
a Material Adverse Effect.

          (c) The representations and warranties of the Borrower and the
Guarantors set forth in this Agreement and in the other Loan Documents shall be
true and correct on and as of the date of such Borrowing or the date of
issuance, amendment, renewal or extension of such Letter of Credit, as
applicable, except to the extent any such representations and warranties are
expressly limited to an earlier date, in which case, on and as of the date of
such Borrowing or the date of issuance, amendment, renewal or extension of such
Letter of Credit, as applicable, such representations and warranties shall
continue to be true and correct as of such specified earlier date.

          (d) The making of such Loan or the issuance, amendment, renewal or
extension of such Letter of Credit, as applicable, would not conflict with, or
cause any Lender or the Issuing Bank to violate or exceed, any applicable
Governmental Requirement, and no Change in Law shall have occurred, and no
litigation shall be pending or threatened, which does or, with respect to any
threatened litigation, seeks to, enjoin, prohibit or restrain, the making or
repayment of any Loan, the issuance, amendment, renewal, extension or repayment
of any Letter


                                       47

<PAGE>

of Credit or any participations therein or the consummation of the transactions
contemplated by this Agreement or any other Loan Document.

          (e) The receipt by the Administrative Agent of a Borrowing Request in
accordance with Section 2.03 or a request for a Letter of Credit in accordance
with Section 2.08(b), as applicable.

     Each Borrowing and each issuance, amendment, renewal or extension of any
Letter of Credit shall be deemed to constitute a representation and warranty by
the Borrower on the date thereof as to the matters specified in Section 6.02(a)
through (e).

                                   ARTICLE VII
                         REPRESENTATIONS AND WARRANTIES

     The Borrower represents and warrants to the Lenders that:

     Section 7.01 Organization; Powers. Each of the Borrower and the Restricted
Subsidiaries is duly organized, validly existing and in good standing under the
laws of the jurisdiction of its organization, has all requisite power and
authority, and has all material governmental licenses, authorizations, consents
and approvals necessary, to own its assets and to carry on its business as now
conducted, and is qualified to do business in, and is in good standing in, every
jurisdiction where such qualification is required, except where failure to have
such power, authority, licenses, authorizations, consents, approvals and
qualifications could not reasonably be expected to have a Material Adverse
Effect.

     Section 7.02 Authority; Enforceability. The Transactions are within the
Borrower's and each Guarantor's corporate powers and have been duly authorized
by all necessary corporate and, if required, stockholder action (including,
without limitation, any action required to be taken by any class of directors of
the Borrower, whether interested or disinterested, in order to ensure the due
authorization of the Transactions). Each Loan Document and Merger Document to
which the Borrower and each Guarantor is a party has been duly executed and
delivered by the Borrower and such Guarantor and constitutes a legal, valid and
binding obligation of the Borrower and such Guarantor, as applicable,
enforceable in accordance with its terms, subject to applicable bankruptcy,
insolvency, reorganization, moratorium or other laws affecting creditors' rights
generally and subject to general principles of equity, regardless of whether
considered in a proceeding in equity or at law.

     Section 7.03 Approvals; No Conflicts. The Transactions (a) do not require
any consent or approval of, registration or filing with, or any other action by,
any Governmental Authority or any other third Person, nor is any such consent,
approval, registration, filing or other action necessary for the validity or
enforceability of any Loan Document or the consummation of the Transactions,
except such as have been obtained or made and are in full force and effect other
than (i) the recording and filing of the Security Instruments as required by
this Agreement and (ii) those third party approvals or consents which, if not
made or obtained, would not cause a Default hereunder, could not reasonably be
expected to have a Material Adverse Effect or do not have an adverse effect on
the enforceability of the Loan Documents, (b) will not violate any applicable
law or regulation or the charter, by-laws or other organizational documents of
the


                                       48

<PAGE>

Borrower or any Restricted Subsidiary or any order of any Governmental
Authority, (c) will not violate or result in a default under any indenture,
agreement or other instrument binding upon the Borrower or any Restricted
Subsidiary or its Properties, or give rise to a right thereunder to require any
payment to be made by the Borrower or such Restricted Subsidiary and (d) will
not result in the creation or imposition of any Lien on any Property of the
Borrower or any Restricted Subsidiary (other than the Liens created by the Loan
Documents).

     Section 7.04 Financial Condition; No Material Adverse Change

          (a) The Borrower has heretofore furnished to the Lenders (i) its
consolidated balance sheet and statements of income, stockholders equity and
cash flows (x) as of and for the fiscal year ended December 31, 2004, reported
on by Deloitte & Touche LLP, independent public accountants, and (y) as of and
for the fiscal quarter and the portion of the fiscal year ended March 31, 2005,
reviewed by Deloitte & Touche LLP and (ii) the statements of income,
stockholders equity and cash flows of Mission as of and for the fiscal quarter
and the portion of the fiscal year ended December 31, 2004 and March 31, 2005,
certified by its chief financial officer. Such financial statements present
fairly, in all material respects, the financial position and results of
operations and cash flows of the Borrower and its Consolidated Subsidiaries as
of such dates and for such periods in accordance with GAAP, subject to year-end
audit adjustments and the absence of footnotes in the case of the unaudited
quarterly financial statements. The Borrower has heretofore furnished to the
Lenders the unaudited, pro forma consolidated balance sheet and statements of
income, stockholders equity and cash flows as of and for the six-month period
ended June 30, 2005 adjusted to give effect to the Mergers, this Agreement, and
the other transactions contemplated by Section 6.01(h), certified by its chief
financial officer as presenting fairly, in all material respects, the
consolidated pro forma financial position and results of operations and cash
flows of the Borrower and its Consolidated Subsidiaries as of such date and for
such period in accordance with GAAP, subject to year-end audit adjustments and
the absence of footnotes in the case of the unaudited quarterly financial
statements.

          (b) Since December 31, 2004, (i) there has been no event, development
or circumstance that has had or could reasonably be expected to have a Material
Adverse Effect and (ii) the business of the Borrower and its Restricted
Subsidiaries has been conducted only in the ordinary course consistent with past
business practices.

          (c) Neither the Borrower nor any Restricted Subsidiary has on the date
hereof any material Debt (including Disqualified Capital Stock) or any
contingent liabilities, off-balance sheet liabilities or partnerships,
liabilities for taxes, unusual forward or long-term commitments or unrealized or
anticipated losses from any unfavorable commitments (other than the Gas
Balancing Obligations and the Swap Agreements listed on Schedule 7.21) which are
not referred to or reflected or provided for in the Financial Statements.

     Section 7.05 Litigation.

          (a) Except as set forth on Schedule 7.05, there are no actions, suits,
investigations or proceedings by or before any arbitrator or Governmental
Authority pending against or, to the Knowledge of the Borrower, threatened
against or affecting the Borrower, any Restricted Subsidiary, Mission, or
involving the Mergers (i) not fully covered by insurance (except for


                                       49

<PAGE>

normal deductibles) as to which there is a reasonable possibility of an adverse
determination that, if adversely determined, could reasonably be expected,
individually or in the aggregate, to result in a Material Adverse Effect, (ii)
that involve any Loan Document, any Merger Document or the Transactions or (iii)
that could impair the consummation of the Mergers on the time and in the manner
contemplated by the Merger Documents.

          (b) Since the date of this Agreement, there has been no change in the
status of the matters disclosed in Schedule 7.05 that, individually or in the
aggregate, has resulted in, or materially increased the likelihood of, a
Material Adverse Effect.

     Section 7.06 Environmental Matters. Except as could not be reasonably
expected to have a Material Adverse Effect (or with respect to (c), (d) and (e)
below, where the failure to take such actions could not be reasonably expected
to have a Material Adverse Effect):

          (a) neither any Property of the Borrower or any Restricted Subsidiary
nor the operations conducted thereon violate any order or requirement of any
court or Governmental Authority or any Environmental Laws.

          (b) no Property of the Borrower or any Restricted Subsidiary nor the
operations currently conducted thereon or, to the Knowledge of the Borrower, by
any prior owner or operator of such Property or operation, are in violation of
or subject to any existing, pending or threatened action, suit, investigation,
inquiry or proceeding by or before any court or Governmental Authority or to any
remedial obligations under Environmental Laws.

          (c) all notices, permits, licenses, exemptions, approvals or similar
authorizations, if any, required to be obtained or filed in connection with the
operation or use of any and all Property of the Borrower and each Restricted
Subsidiary, including, without limitation, past or present treatment, storage,
disposal or release of a hazardous substance, oil and gas waste or solid waste
into the environment, have been duly obtained or filed, and the Borrower and
each Restricted Subsidiary are in compliance with the terms and conditions of
all such notices, permits, licenses and similar authorizations.

          (d) all hazardous substances, solid waste and oil and gas waste, if
any, generated at any and all Property of the Borrower or any Restricted
Subsidiary have in the past been transported, treated and disposed of in
accordance with Environmental Laws and so as not to pose an imminent and
substantial endangerment to public health or welfare or the environment, and, to
the Knowledge of the Borrower, all such transport carriers and treatment and
disposal facilities have been and are operating in compliance with Environmental
Laws and so as not to pose an imminent and substantial endangerment to public
health or welfare or the environment, and are not the subject of any existing,
pending or threatened action, investigation or inquiry by any Governmental
Authority in connection with any Environmental Laws.

          (e) the Borrower has taken all steps reasonably necessary to determine
and has determined that no oil, hazardous substances, solid waste or oil and gas
waste, have been disposed of or otherwise released and there has been no
threatened release of any oil, hazardous substances, solid waste or oil and gas
waste on or to any Property of the Borrower or any


                                       50

<PAGE>

Restricted Subsidiary except in compliance with Environmental Laws and so as not
to pose an imminent and substantial endangerment to public health or welfare or
the environment.

          (f) to the extent applicable, all Property of the Borrower and each
Restricted Subsidiary currently satisfies all design, operation, and equipment
requirements imposed by the OPA, and the Borrower does not have any reason to
believe that such Property, to the extent subject to the OPA, will not be able
to maintain compliance with the OPA requirements during the term of this
Agreement.

          (g) neither the Borrower nor any Restricted Subsidiary has any known
contingent liability or Remedial Work in connection with any release or
threatened release of any oil, hazardous substance, solid waste or oil and gas
waste into the environment.

     Section 7.07 Compliance with the Laws and Agreements; No Defaults.

          (a) Each of the Borrower and each Restricted Subsidiary is in
compliance with all Governmental Requirements applicable to it or its Property
and all agreements and other instruments binding upon it or its Property, and
possesses all licenses, permits, franchises, exemptions, approvals and other
governmental authorizations necessary for the ownership of its Property and the
conduct of its business, except where the failure to do so, individually or in
the aggregate, could not reasonably be expected to result in a Material Adverse
Effect.

          (b) Neither the Borrower nor any Restricted Subsidiary is in default
nor has any event or circumstance occurred which, but for the expiration of any
applicable grace period or the giving of notice, or both, would constitute a
default or would require the Borrower or a Restricted Subsidiary to Redeem or
make any offer to Redeem under any indenture, note, credit agreement or
instrument pursuant to which any Material Indebtedness is outstanding or by
which the Borrower or any Restricted Subsidiary or any of their Properties is
bound.

          (c) No Default has occurred and is continuing.

     Section 7.08 Investment Company Act. Neither the Borrower nor any
Subsidiary is an "investment company" or a company "controlled" by an
"investment company," within the meaning of, or subject to regulation under, the
Investment Company Act of 1940, as amended.

     Section 7.09 Public Utility Holding Company Act. Neither the Borrower nor
any Subsidiary is a "holding company," or a "subsidiary company" of a "holding
company," or an "affiliate" of a "holding company" or of a "subsidiary company"
of a "holding company," or a "public utility" within the meaning of, or subject
to regulation under, the Public Utility Holding Company Act of 1935, as amended.

     Section 7.10 Taxes. Each of the Borrower and its Subsidiaries has timely
filed or caused to be filed all Tax returns and reports required to have been
filed and has paid or caused to be paid all Taxes required to have been paid by
it, except (a) Taxes that are being contested in good faith by appropriate
proceedings and for which the Borrower or such Subsidiary, as applicable, has
set aside on its books adequate reserves in accordance with GAAP or (b) to the
extent that the failure to do so could not reasonably be expected to result in a
Material Adverse Effect. The charges, accruals and reserves on the books of the
Borrower and its Subsidiaries in


                                       51

<PAGE>

respect of Taxes and other governmental charges are, in the reasonable opinion
of the Borrower, adequate. No Tax Lien has been filed and, to the Knowledge of
the Borrower, no claim is being asserted with respect to any such Tax or other
such governmental charge.

     Section 7.11 ERISA.

          (a) The Borrower, the Subsidiaries and each ERISA Affiliate have
complied in all material respects with ERISA and, where applicable, the Code
regarding each Plan.

          (b) Each Plan is, and has been, maintained in substantial compliance
with ERISA and, where applicable, the Code.

          (c) No act, omission or transaction has occurred which could result in
imposition on the Borrower, any Subsidiary or any ERISA Affiliate (whether
directly or indirectly) of (i) either a civil penalty assessed pursuant to
subsections (c), (i) or (l) of section 502 of ERISA or a tax imposed pursuant to
Chapter 43 of Subtitle D of the Code or (ii) breach of fiduciary duty liability
damages under section 409 of ERISA.

          (d) No Plan (other than a defined contribution plan) or any trust
created under any such Plan has been terminated since September 2, 1974. No
liability to the PBGC (other than for the payment of current premiums which are
not past due) by the Borrower, any Subsidiary or any ERISA Affiliate has been or
is expected by the Borrower, any Subsidiary or any ERISA Affiliate to be
incurred with respect to any Plan. No ERISA Event with respect to any Plan has
occurred.

          (e) Full payment when due has been made of all amounts which the
Borrower, the Subsidiaries or any ERISA Affiliate is required under the terms of
each Plan or applicable law to have paid as contributions to such Plan as of the
date hereof, and no accumulated funding deficiency (as defined in section 302 of
ERISA and section 412 of the Code), whether or not waived, exists with respect
to any Plan.

          (f) The actuarial present value of the benefit liabilities under each
Plan which is subject to Title IV of ERISA does not, as of the end of the
Borrower's most recently ended fiscal year, exceed the current value of the
assets (computed on a plan termination basis in accordance with Title IV of
ERISA) of such Plan allocable to such benefit liabilities. The term "actuarial
present value of the benefit liabilities" shall have the meaning specified in
section 4041 of ERISA.

          (g) Neither the Borrower, the Subsidiaries nor any ERISA Affiliate
sponsors, maintains, or contributes to an employee welfare benefit plan, as
defined in section 3(1) of ERISA, including, without limitation, any such plan
maintained to provide benefits to former employees of such entities, that may
not be terminated by the Borrower, a Subsidiary or any ERISA Affiliate in its
sole discretion at any time without any material liability.

          (h) Neither the Borrower, the Subsidiaries nor any ERISA Affiliate
sponsors, maintains or contributes to, or has at any time in the six-year period
preceding the date hereof sponsored, maintained or contributed to, any
Multiemployer Plan.


                                       52

<PAGE>

          (i) Neither the Borrower, the Subsidiaries nor any ERISA Affiliate is
required to provide security under section 401(a)(29) of the Code due to a Plan
amendment that results in an increase in current liability for the Plan.

     Section 7.12 Disclosure; No Material Misstatements. The Borrower has
disclosed to the Administrative Agent and the Lenders all agreements,
instruments and corporate or other restrictions to which it or any of its
Restricted Subsidiaries is subject, and all other matters known to it, that,
individually or in the aggregate, could reasonably be expected to result in a
Material Adverse Effect. Neither the Information Memorandum nor any of the other
reports, financial statements, certificates or other information furnished by or
on behalf of the Borrower or any Restricted Subsidiary to the Administrative
Agent or any Lender or any of their Affiliates in connection with the
negotiation of this Agreement or any other Loan Document or delivered hereunder
or under any other Loan Document (as modified or supplemented by other
information so furnished) contains any material misstatement of fact or omits to
state any material fact necessary to make the statements therein, in the light
of the circumstances under which they were made, not misleading; provided that,
with respect to projected financial information, the Borrower represents only
that such information was prepared in good faith based upon assumptions believed
to be reasonable at the time. There is no fact peculiar to the Borrower or any
Restricted Subsidiary which could reasonably be expected to have a Material
Adverse Effect or in the future is reasonably likely to have a Material Adverse
Effect and which has not been set forth in this Agreement or the Loan Documents
or the other documents, certificates and statements furnished to the
Administrative Agent or the Lenders by or on behalf of the Borrower or any
Restricted Subsidiary prior to, or on, the date hereof in connection with the
transactions contemplated hereby. No statements or conclusions exist in any
Reserve Report which are based upon or include misleading information or which
fail to take into account material information regarding the matters reported
therein to the extent such misstatement, misleading information or failure could
reasonably be expected to have a Material Adverse Effect.

     Section 7.13 Insurance. The Borrower has, and has caused all its Restricted
Subsidiaries to have, (a) all insurance policies sufficient for the compliance
by each of them with all material Governmental Requirements and all material
agreements and (b) insurance coverage in at least amounts and against such risk
(including, without limitation, public liability) that are usually insured
against by companies similarly situated and engaged in the same or a similar
business for the assets and operations of the Borrower and its Restricted
Subsidiaries. The Administrative Agent and the Lenders have been named as
additional insureds in respect of such liability insurance policies and the
Administrative Agent has been named as loss payee with respect to Property loss
insurance.

     Section 7.14 Restriction on Liens. Neither the Borrower nor any of the
Restricted Subsidiaries is a party to any material agreement or arrangement
(other than Capital Leases creating Liens permitted by Section 9.03(c), but then
only on the Property subject of such Capital Lease), or subject to any order,
judgment, writ or decree, which either restricts or purports to restrict its
ability to grant Liens to the Administrative Agent and the Lenders on or in
respect of their Properties to secure the Indebtedness and the Loan Documents.


                                       53

<PAGE>

     Section 7.15 Subsidiaries. Except as set forth on Schedule 7.15 or as
disclosed in writing to the Administrative Agent (which shall promptly furnish a
copy to the Lenders), which shall be a supplement to Schedule 7.15, the Borrower
has no Subsidiaries and the Borrower has no Foreign Subsidiaries. Schedule 7.15
identifies each Subsidiary as either Restricted or Unrestricted, and each
Restricted Subsidiary on such schedule is a Wholly-Owned Subsidiary.

     Section 7.16 Location of Business and Offices. The Borrower's jurisdiction
of organization is Delaware; the name of the Borrower as listed in the public
records of its jurisdiction of organization is Petrohawk Energy Corporation; and
the organizational identification number of the Borrower in its jurisdiction of
organization is 3828463 (or, in each case, as set forth in a notice delivered to
the Administrative Agent pursuant to Section 8.01(m) in accordance with Section
12.01). The Borrower's principal place of business and chief executive offices
are located at the address specified in Section 12.01 (or as set forth in a
notice delivered pursuant to Section 8.01(m) and Section 12.01(c)). Each
Restricted Subsidiary's jurisdiction of organization, name as listed in the
public records of its jurisdiction of organization, organizational
identification number in its jurisdiction of organization, and the location of
its principal place of business and chief executive office is stated on Schedule
7.15 (or as set forth in a notice delivered pursuant to Section 8.01(m)).

     Section 7.17 Properties; Titles, Etc.

          (a) Each of the Borrower and the Restricted Subsidiaries has good and
defensible title to the Oil and Gas Properties evaluated in the most recently
delivered Reserve Report and good title to all its personal Properties, in each
case, free and clear of all Liens except Liens permitted by Section 9.03. After
giving full effect to the Excepted Liens, the Borrower or the Restricted
Subsidiary specified as the owner owns the net interests in production
attributable to the Hydrocarbon Interests as reflected in the most recently
delivered Reserve Report, and the ownership of such Properties shall not in any
material respect obligate the Borrower or such Restricted Subsidiary to bear the
costs and expenses relating to the maintenance, development and operations of
each such Property in an amount in excess of the working interest of each
Property set forth in the most recently delivered Reserve Report that is not
offset by a corresponding proportionate increase in the Borrower's or such
Restricted Subsidiary's net revenue interest in such Property.

          (b) All material leases and agreements necessary for the conduct of
the business of the Borrower and the Restricted Subsidiaries are valid and
subsisting, in full force and effect, and there exists no default or event or
circumstance which with the giving of notice or the passage of time or both
would give rise to a default under any such lease or leases, which could
reasonably be expected to have a Material Adverse Effect.

          (c) The rights and Properties presently owned, leased or licensed by
the Borrower and the Restricted Subsidiaries including, without limitation, all
easements and rights of way, include all rights and Properties necessary to
permit the Borrower and the Restricted Subsidiaries to conduct their business in
all material respects in the same manner as its business has been conducted
prior to the date hereof.


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<PAGE>

          (d) All of the Properties of the Borrower and the Restricted
Subsidiaries which are reasonably necessary for the operation of their
businesses are in good working condition and are maintained in accordance with
prudent business standards.

          (e) The Borrower and each Restricted Subsidiary owns, or is licensed
to use, all trademarks, tradenames, copyrights, patents and other intellectual
Property material to its business, and the use thereof by the Borrower and such
Restricted Subsidiary does not infringe upon the rights of any other Person,
except for any such infringements that, individually or in the aggregate, could
not reasonably be expected to result in a Material Adverse Effect. The Borrower
and its Restricted Subsidiaries either own or have valid licenses or other
rights to use all databases, geological data, geophysical data, engineering
data, seismic data, maps, interpretations and other technical information used
in their businesses as presently conducted, subject to the limitations contained
in the agreements governing the use of the same, which limitations are customary
for companies engaged in the business of the exploration and production of
Hydrocarbons, with such exceptions as could not reasonably be expected to have a
Material Adverse Effect.

     Section 7.18 Maintenance of Properties. Except for such acts or failures to
act as could not be reasonably expected to have a Material Adverse Effect, the
Oil and Gas Properties (and Properties unitized therewith) of the Borrower and
its Restricted Subsidiaries have been maintained, operated and developed in a
good and workmanlike manner and in conformity with all Government Requirements
and in conformity with the provisions of all leases, subleases or other
contracts comprising a part of the Hydrocarbon Interests and other contracts and
agreements forming a part of the Oil and Gas Properties of the Borrower and its
Restricted Subsidiaries. Specifically in connection with the foregoing, except
for those as could not be reasonably expected to have a Material Adverse Effect,
(i) no Oil and Gas Property of the Borrower or any Restricted Subsidiary is
subject to having allowable production reduced below the full and regular
allowable (including the maximum permissible tolerance) because of any
overproduction (whether or not the same was permissible at the time) and (ii)
none of the wells comprising a part of the Oil and Gas Properties (or Properties
unitized therewith) of the Borrower or any Restricted Subsidiary is deviated
from the vertical more than the maximum permitted by Government Requirements,
and such wells are, in fact, bottomed under and are producing from, and the well
bores are wholly within, the Oil and Gas Properties (or in the case of wells
located on Properties unitized therewith, such unitized Properties) of the
Borrower or such Restricted Subsidiary. All pipelines, wells, gas processing
plants, platforms and other material improvements, fixtures and equipment owned
in whole or in part by the Borrower or any of its Restricted Subsidiaries that
are necessary to conduct normal operations are being maintained in a state
adequate to conduct normal operations, and with respect to such of the foregoing
which are operated by the Borrower or any of its Restricted Subsidiaries, in a
manner consistent with the Borrower's or its Restricted Subsidiaries' past
practices (other than those the failure of which to maintain in accordance with
this Section 7.18 could not reasonably be expected to have a Material Adverse
Effect).

     Section 7.19 Gas Imbalances, Prepayments. Except as set forth on Schedule
7.19 or on the most recent certificate delivered pursuant to Section 8.12(c), on
a net basis there are no gas imbalances, take or pay or other prepayments which
would require the Borrower or any of its Restricted Subsidiaries to deliver
Hydrocarbons produced from the Oil and Gas Properties at


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<PAGE>

some future time without then or thereafter receiving full payment therefor
exceeding 1.5 bcf of gas (on an mcf equivalent basis) in the aggregate.

     Section 7.20 Marketing of Production. Except for contracts listed and in
effect on the date hereof on Schedule 7.20, and thereafter either disclosed in
writing to the Administrative Agent or included in the most recently delivered
Reserve Report (with respect to all of which contracts the Borrower represents
that it or its Restricted Subsidiaries are receiving a price for all production
sold thereunder which is computed substantially in accordance with the terms of
the relevant contract and are not having deliveries curtailed substantially
below the subject Property's delivery capacity), no material agreements exist
which are not cancelable on 60 days notice or less without penalty or detriment
for the sale of production from the Borrower's or its Restricted Subsidiaries'
Hydrocarbons (including, without limitation, calls on or other rights to
purchase, production, whether or not the same are currently being exercised)
that (a) pertain to the sale of production at a fixed price and (b) have a
maturity or expiry date of longer than six (6) months from the date hereof.

     Section 7.21 Swap Agreements. Schedule 7.21, as of the date hereof, and
after the date hereof, each report required to be delivered by the Borrower
pursuant to Section 8.01(e), sets forth, a true and complete list of all Swap
Agreements of the Borrower and each Restricted Subsidiary, the material terms
thereof (including the type, term, effective date, termination date and notional
amounts or volumes), the net mark to market value thereof, all credit support
agreements relating thereto (including any margin required or supplied) and the
counterparty to each such agreement.

     Section 7.22 Use of Loans and Letters of Credit. The proceeds of the Loans
and the Letters of Credit shall be used to provide working capital for
exploration and production operations, to provide funding in connection with the
Mergers and for general corporate purposes, including the issuance of letters of
credit. The Borrower and its Subsidiaries are not engaged principally, or as one
of its or their important activities, in the business of extending credit for
the purpose, whether immediate, incidental or ultimate, of buying or carrying
margin stock (within the meaning of Regulation T, U or X of the Board). No part
of the proceeds of any Loan or Letter of Credit will be used for any purpose
which violates the provisions of Regulations T, U or X of the Board.

     Section 7.23 Solvency. After giving effect to the transactions contemplated
hereby, (a) the aggregate assets (after giving effect to amounts that could
reasonably be received by reason of indemnity, offset, insurance or any similar
arrangement), at a fair valuation, of the Borrower and the Guarantors, taken as
a whole, will exceed the aggregate Debt of the Borrower and the Guarantors on a
consolidated basis, as the Debt becomes absolute and matures, (b) each of the
Borrower and the Guarantors will not have incurred or intended to incur, and
will not believe that it will incur, Debt beyond its ability to pay such Debt
(after taking into account the timing and amounts of cash to be received by each
of the Borrower and the Guarantors and the amounts to be payable on or in
respect of its liabilities, and giving effect to amounts that could reasonably
be received by reason of indemnity, offset, insurance or any similar
arrangement) as such Debt becomes absolute and matures and (c) each of the
Borrower and the Guarantors will not have (and will have no reason to believe
that it will have thereafter) unreasonably small capital for the conduct of its
business.


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<PAGE>

     Section 7.24 Specified Senior Indebtedness. The Indebtedness of the
Borrower constitutes "Senior Indebtedness" and "Specified Senior Indebtedness,"
and the Indebtedness of each Guarantor under the Loan Documents to which it is a
party constitutes "Guarantor Senior Indebtedness" and "Specified Guarantor
Senior Indebtedness," in each case, under and as defined in the Second Lien Term
Loan Documents.

     Section 7.25 Mergers. The copies of the Merger Documents previously
delivered by the Borrower to the Administrative Agent are true, accurate and
complete and have not been amended or modified in any manner, other than
pursuant to amendments or modifications previously delivered to the
Administrative Agent. Neither the Borrower nor any Person constituting a
Subsidiary prior to the effectiveness of the Mergers is in default in respect of
any material term or obligation set forth in the Merger Documents. To the
Knowledge of the Borrower, none of Mission's or any of Mission's respective
shareholders, members, partners or other holders of Equity Interests is in
default in respect of any material term or obligation set forth in the Merger
Documents.

                                  ARTICLE VIII
                              AFFIRMATIVE COVENANTS

     Until the Commitments have expired or been terminated and the principal of
and interest on each Loan and all fees payable hereunder and all other amounts
payable under the Loan Documents shall have been paid in full and all Letters of
Credit shall have expired or terminated and all LC Disbursements shall have been
reimbursed, the Borrower covenants and agrees with the Lenders that:

     Section 8.01 Financial Statements; Ratings Change; Other Information. The
Borrower will furnish to the Administrative Agent and each Lender:

          (a) Annual Financial Statements. As soon as available, but in any
event in accordance with then applicable law and not later than 90 days after
the end of each fiscal year of the Borrower, its audited consolidated balance
sheet and related statements of operations, stockholders' equity and cash flows
as of the end of and for such year, setting forth in each case in comparative
form the figures for the previous fiscal year, all reported on by independent
public accountants of recognized national standing (without a "going concern" or
like qualification or exception and without any qualification or exception as to
the scope of such audit) to the effect that such consolidated financial
statements present fairly in all material respects the financial condition and
results of operations of the Borrower and its Consolidated Subsidiaries on a
consolidated basis in accordance with GAAP consistently applied.

          (b) Quarterly Financial Statements. As soon as available, but in any
event in accordance with then applicable law and not later than 45 days after
the end of each of the first three fiscal quarters of each fiscal year of the
Borrower, its consolidated balance sheet and related statements of operations,
stockholders' equity and cash flows as of the end of and for such fiscal quarter
and the then elapsed portion of the fiscal year, setting forth in each case in
comparative form the figures for the corresponding period or periods of (or, in
the case of the balance sheet, as of the end of) the previous fiscal year, all
certified by one of its Financial Officers as presenting fairly in all material
respects the financial condition and results of


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<PAGE>

operations of the Borrower and its Consolidated Subsidiaries on a consolidated
basis in accordance with GAAP consistently applied, subject to normal year-end
audit adjustments and the absence of footnotes.

          (c) Certificate of Financial Officer -- Compliance. Concurrently with
any delivery of financial statements under Section 8.01(a) or Section 8.01(b), a
certificate of a Financial Officer in substantially the form of Exhibit D hereto
(i) certifying as to whether a Default has occurred and, if a Default has
occurred, specifying the details thereof and any action taken or proposed to be
taken with respect thereto, (ii) setting forth reasonably detailed calculations
demonstrating compliance with Section 8.13(b) and Section 9.01 and (iii) stating
whether any change in GAAP or in the application thereof has occurred since the
date of the audited financial statements referred to in Section 7.04 and, if any
such change has occurred, specifying the effect of such change on the financial
statements accompanying such certificate.

          (d) Certificate of Financial Officer -- Consolidating Information. If,
at any time, all of the Consolidated Subsidiaries of the Borrower are not
Consolidated Restricted Subsidiaries, then concurrently with any delivery of
financial statements under Section 8.01(a) or Section 8.01(b), a certificate of
a Financial Officer setting forth consolidating spreadsheets that show all
Consolidated Unrestricted Subsidiaries and the eliminating entries, in such form
as would be presentable to the auditors of the Borrower.

          (e) Certificate of Financial Officer - Swap Agreements. Concurrently
with any delivery of financial statements under Section 8.01(a) and Section
8.01(b), a certificate of a Financial Officer, in form and substance
satisfactory to the Administrative Agent, setting forth as of the last Business
Day of such fiscal quarter or fiscal year, a true and complete list of all Swap
Agreements of the Borrower and each Restricted Subsidiary, the material terms
thereof (including the type, term, effective date, termination date and notional
amounts or volumes), the net mark-to-market value therefor, any new credit
support agreements relating thereto not listed on Schedule 7.21, any margin
required or supplied under any credit support document, and the counterparty to
each such agreement.

          (f) Certificate of Insurer -- Insurance Coverage. Concurrently with
any delivery of financial statements under Section 8.01(a), a certificate of
insurance coverage from each insurer with respect to the insurance required by
Section 8.07, in form and substance satisfactory to the Administrative Agent,
and, if requested by the Administrative Agent or any Lender, all copies of the
applicable policies.

          (g) Other Accounting Reports. Promptly upon receipt thereof, a copy of
each other report or letter submitted to the Borrower or any of its Subsidiaries
by independent accountants in connection with any annual, interim or special
audit made by them of the books of the Borrower or any such Subsidiary, and a
copy of any response by the Borrower or any such Subsidiary, or the Board of
Directors of the Borrower or any such Subsidiary, to such letter or report.

          (h) SEC and Other Filings; Reports to Shareholders. Promptly after the
same become publicly available, and upon the request of the Lenders, copies of
all periodic and other reports, proxy statements and other materials filed by
the Borrower or any Subsidiary with the


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<PAGE>

SEC, or with any national securities exchange and distributed by the Borrower to
its shareholders.

          (i) Notices Under Material Instruments. Promptly after the furnishing
thereof, copies of any financial statement, report or notice furnished to or by
any Person pursuant to the terms of any preferred stock designation, indenture,
loan or credit or other similar agreement, other than this Agreement and not
otherwise required to be furnished to the Lenders pursuant to any other
provision of this Section 8.01.

          (j) Lists of Purchasers. Concurrently with the delivery of any Reserve
Report to the Administrative Agent pursuant to Section 8.12, a list of Persons
who purchase (or did purchase in the last six months) at least 70% of the
Hydrocarbons from the Borrower or any Restricted Subsidiary.

          (k) Notice of Sales of Oil and Gas Properties. In the event the
Borrower or any Restricted Subsidiary intends to sell, transfer, assign or
otherwise dispose of at least $500,000 worth of any Oil or Gas Properties or any
Equity Interests in any Subsidiary in accordance with Section 9.13, prior
written notice of such disposition, the price thereof and the anticipated date
of closing.

          (l) Notice of Casualty Events. Prompt written notice, and in any event
within three Business Days, of the occurrence of any Casualty Event or the
commencement of any action or proceeding that could reasonably be expected to
result in a Casualty Event.

          (m) Information Regarding Borrower and Guarantors. Prompt written
notice (and in any event within thirty (30) days prior thereto) of any change
(i) in the Borrower or any Guarantor's corporate name or in any trade name used
to identify such Person in the conduct of its business or in the ownership of
its Properties, (ii) in the location of the Borrower or any Guarantor's chief
executive office or principal place of business, (iii) in the Borrower or any
Guarantor's identity or corporate structure or in the jurisdiction in which such
Person is incorporated or formed, (iv) in the Borrower or any Guarantor's
jurisdiction of organization or such Person's organizational identification
number in such jurisdiction of organization, and (v) in the Borrower or any
Guarantor's federal taxpayer identification number.

          (n) Production Report and Lease Operating Statements. With the
delivery of quarterly financial statements under Section 8.01(b) and in any
event, no later than 60 days after the end of each fiscal quarter, a report
setting forth, for each calendar month during the then current fiscal year to
date on a production date basis, the volume of production and sales attributable
to production (and the prices at which such sales were made and the revenues
derived from such sales) for each such calendar month from the Oil and Gas
Properties, and setting forth the related ad valorem, severance and production
taxes and lease operating expenses attributable thereto and incurred for each
such calendar month.

          (o) Notices of Certain Changes. Promptly, but in any event within five
(5) Business Days after the execution thereof, copies of any amendment,
modification or supplement to the certificate or articles of incorporation,
by-laws, any preferred stock designation or any other organic document of the
Borrower or any Restricted Subsidiary.


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<PAGE>

          (p) Ratings Change. Promptly after Moody's or S&P shall have announced
a change in the rating, established or deemed to have been established for the
Borrower or any Material Indebtedness, written notice of such rating change.

          (q) Other Requested Information. Promptly following any request
therefor, such other information regarding the operations, business affairs and
financial condition of the Borrower or any Subsidiary (including, without
limitation, any Plan or Multiemployer Plan and any reports or other information
required to be filed under ERISA), or compliance with the terms of this
Agreement or any other Loan Document, as the Administrative Agent or any Lender
may reasonably request.

          (s) Delivery of Information Electronically. Notices to the
Administrative Agent and the Lenders under this Section 8.01 may be delivered or
furnished by electronic communications pursuant to procedures approved by the
Administrative Agent, including broadcast email to the Lenders that the
available information has been made available to the Lenders on either the
Borrower's "Intralinks" page or the Borrower's website at www.petrohawk.com.

     Section 8.02 Notices of Material Events. The Borrower will furnish to the
Administrative Agent and each Lender prompt written notice of the following:

          (a) the occurrence of any Default;

          (b) the filing or commencement of, or the threat in writing of, any
action, suit, proceeding, investigation or arbitration by or before any
arbitrator or Governmental Authority against or affecting the Borrower or any
Affiliate thereof not previously disclosed in writing to the Lenders or any
material adverse development in any action, suit, proceeding, investigation or
arbitration previously disclosed to the Lenders that, if adversely determined,
could reasonably be expected to result in liability in excess of $2,000,000 not
fully covered by insurance, subject to normal deductibles;

          (c) the occurrence of any ERISA Event that, alone or together with any
other ERISA Events that have occurred, could reasonably be expected to result in
liability of the Borrower and its Subsidiaries in an aggregate amount exceeding
$1,000,000; and

          (d) any other development that results in, or could reasonably be
expected to result in, a Material Adverse Effect.

Each notice delivered under this Section 8.02 shall be accompanied by a
statement of a Responsible Officer setting forth the details of the event or
development requiring such notice and any action taken or proposed to be taken
with respect thereto.

     Section 8.03 Existence; Conduct of Business. The Borrower will, and will
cause each Restricted Subsidiary to, do or cause to be done all things necessary
to preserve, renew and keep in full force and effect its legal existence and the
rights, licenses, permits, privileges and franchises material to the conduct of
its business and maintain, if necessary, its qualification to do business in
each other jurisdiction in which its Oil and Gas Properties is located or the
ownership of its Properties requires such qualification, except where the
failure to so qualify


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<PAGE>

could not reasonably be expected to have a Material Adverse Effect; provided
that the foregoing shall not prohibit any merger, consolidation, liquidation or
dissolution permitted under Section 9.12.

     Section 8.04 Payment of Obligations. The Borrower will, and will cause each
Restricted Subsidiary to, pay its obligations, including Tax liabilities of the
Borrower and all of its Subsidiaries before the same shall become delinquent or
in default, except where (a) the validity or amount thereof is being contested
in good faith by appropriate proceedings, (b) the Borrower or such Restricted
Subsidiary has set aside on its books adequate reserves with respect thereto in
accordance with GAAP and (c) the failure to make payment pending such contest
could not reasonably be expected to result in a Material Adverse Effect or
result in the seizure or levy of any Property of the Borrower or any Subsidiary.

     Section 8.05 Performance of Obligations under Loan Documents. The Borrower
will pay the Loans according to the reading, tenor and effect thereof, and the
Borrower will, and will cause each Restricted Subsidiary to, do and perform
every act and discharge all of the obligations to be performed and discharged by
them under the Loan Documents, including, without limitation, this Agreement, at
the time or times and in the manner specified.

     Section 8.06 Operation and Maintenance of Properties. The Borrower, at its
own expense, will, and will cause each Restricted Subsidiary to:

          (a) operate its Oil and Gas Properties and other material Properties
or cause such Oil and Gas Properties and other material Properties to be
operated in a careful and efficient manner in accordance with the practices of
the industry and in compliance with all applicable contracts and agreements and
in compliance with all Governmental Requirements, including, without limitation,
applicable pro ration requirements and Environmental Laws, and all applicable
laws, rules and regulations of every other Governmental Authority from time to
time constituted to regulate the development and operation of its Oil and Gas
Properties and the production and sale of Hydrocarbons and other minerals
therefrom, except, in each case, where the failure to comply could not
reasonably be expected to have a Material Adverse Effect.

          (b) keep and maintain all Property material to the conduct of its
business in good working order and condition, ordinary wear and tear excepted
preserve, maintain and keep in good repair, working order and efficiency
(ordinary wear and tear excepted) all of its Oil and Gas Properties and other
Properties, including, without limitation, all equipment, machinery and
facilities except, in each case, where the failure to do so could not reasonably
be expected to have a Material Adverse Effect.

          (c) promptly pay and discharge, or make reasonable and customary
efforts to cause to be paid and discharged, all delay rentals, royalties,
expenses and indebtedness accruing under the leases or other agreements
affecting or pertaining to its Oil and Gas Properties and will do all other
things necessary to keep unimpaired their rights with respect thereto and
prevent any forfeiture thereof or default thereunder.

          (d) promptly perform or make reasonable and customary efforts to cause
to be performed, in accordance with industry standards, the obligations required
by each and all of the


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<PAGE>

assignments, deeds, leases, sub-leases, contracts and agreements affecting its
interests in its Oil and Gas Properties and other material Properties.

          (e) operate its Oil and Gas Properties and other material Properties
or cause or make reasonable and customary efforts to cause such Oil and Gas
Properties and other material Properties to be operated in accordance with the
practices of the industry and in material compliance with all applicable
contracts and agreements and in compliance in all material respects with all
Governmental Requirements.

          (f) to the extent the Borrower is not the operator of any Property,
the Borrower shall use reasonable efforts to cause the operator to comply with
this Section 8.06.

     Section 8.07 Insurance. The Borrower will, and will cause each Restricted
Subsidiary to, maintain, with financially sound and reputable insurance
companies, insurance in such amounts and against such risks as are customarily
maintained by companies engaged in the same or similar businesses operating in
the same or similar locations. The loss payable clauses or provisions in said
insurance policy or policies insuring any of the collateral for the Loans shall
be endorsed in favor of and made payable to the Administrative Agent as its
interests may appear and such policies shall name the Administrative Agent and
the Lenders as "additional insureds" and provide that the insurer will endeavor
to give at least 30 days prior notice of any cancellation to the Administrative
Agent.

     Section 8.08 Books and Records; Inspection Rights. The Borrower will, and
will cause each Restricted Subsidiary to, keep proper books of record and
account in which full, true and correct entries are made of all dealings and
transactions in relation to its business and activities. The Borrower will, and
will cause each Restricted Subsidiary to, permit any representatives designated
by the Administrative Agent or any Lender, upon reasonable prior notice, to
visit and inspect its Properties, to examine and make extracts from its books
and records, and to discuss its affairs, finances and condition with its
officers and independent accountants, all at such reasonable times and as often
as reasonably requested.

     Section 8.09 Compliance with Laws. The Borrower will, and will cause each
Restricted Subsidiary to, comply with all laws, rules, regulations and orders of
any Governmental Authority applicable to it or its Property, except where the
failure to do so, individually or in the aggregate, could not reasonably be
expected to result in a Material Adverse Effect.

     Section 8.10 Environmental Matters.

          (a) The Borrower shall at its sole expense: (i) comply, and shall
cause its Properties and operations and each Subsidiary and each Subsidiary's
Properties and operations to comply, with all applicable Environmental Laws, the
breach of which could be reasonably expected to have a Material Adverse Effect;
(ii) not dispose of or otherwise release, and shall cause each Subsidiary not to
dispose of or otherwise release, any oil, oil and gas waste, hazardous
substance, or solid waste on, under, about or from any of the Borrower's or its
Subsidiaries' Properties or any other Property to the extent caused by the
Borrower's or any of its Subsidiaries' operations except in compliance with
applicable Environmental Laws, the


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<PAGE>

disposal or release of which could reasonably be expected to have a Material
Adverse Effect; (iii) timely obtain or file, and shall cause each Subsidiary to
timely obtain or file, all notices, permits, licenses, exemptions, approvals,
registrations or other authorizations, if any, required under applicable
Environmental Laws to be obtained or filed in connection with the operation or
use of the Borrower's or its Subsidiaries' Properties, which failure to obtain
or file could reasonably be expected to have a Material Adverse Effect; (iv)
promptly commence and diligently prosecute to completion, and shall cause each
Subsidiary to promptly commence and diligently prosecute to completion, any
assessment, evaluation, investigation, monitoring, containment, cleanup,
removal, repair, restoration, remediation or other remedial obligations
(collectively, the "Remedial Work") in the event any Remedial Work is required
or reasonably necessary under applicable Environmental Laws because of or in
connection with the actual or suspected past, present or future disposal or
other release of any oil, oil and gas waste, hazardous substance or solid waste
on, under, about or from any of the Borrower's or its Subsidiaries' Properties,
which failure to commence and diligently prosecute to completion could
reasonably be expected to have a Material Adverse Effect; and (v) establish and
implement, and shall cause each Subsidiary to establish and implement, such
procedures as may be necessary to continuously determine and assure that the
Borrower's and its Subsidiaries' obligations under this Section 8.10(a) are
timely and fully satisfied, which failure to establish and implement could
reasonably be expected to have a Material Adverse Effect.

          (b) The Borrower will promptly, but in no event later than five days
of the occurrence of a triggering event, notify the Administrative Agent and the
Lenders in writing of any threatened action, investigation or inquiry by any
Governmental Authority or any threatened demand or lawsuit by any landowner or
other third party against the Borrower or its Subsidiaries or their Properties
of which the Borrower has Knowledge in connection with any Environmental Laws
(excluding routine testing and corrective action) if the Borrower reasonably
anticipates that such action will result in liability (whether individually or
in the aggregate) in excess of $2,000,000, not fully covered by insurance,
subject to normal deductibles.

          (c) The Borrower will, and will cause each Subsidiary to, provide
environmental audits and tests in accordance with American Society of Testing
Materials standards upon request by the Administrative Agent and the Lenders and
no more than once per year in the absence of any Event of Default (or as
otherwise required to be obtained by the Administrative Agent or the Lenders by
any Governmental Authority), in connection with any future acquisitions of Oil
and Gas Properties or other Properties.

     Section 8.11 Further Assurances.

          (a) The Borrower at its expense will, and will cause each Restricted
Subsidiary to, promptly execute and deliver to the Administrative Agent all such
other documents, agreements and instruments reasonably requested by the
Administrative Agent to comply with, cure any defects or accomplish the
conditions precedent, covenants and agreements of the Borrower or any Restricted
Subsidiary, as the case may be, in the Loan Documents, including the Notes, if
requested, or to further evidence and more fully describe the collateral
intended as security for the Indebtedness, or to correct any omissions in this
Agreement or the Security Instruments, or to state more fully the obligations
secured therein, or to perfect, protect or preserve any Liens created pursuant
to this Agreement or any of the Security Instruments or the priority thereof, or


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to make any recordings, file any notices or obtain any consents, all as may be
reasonably necessary or appropriate, in the sole discretion of the
Administrative Agent, in connection therewith.

          (b) The Borrower hereby authorizes the Administrative Agent to file
one or more financing or continuation statements, and amendments thereto,
relative to all or any part of the Mortgaged Property without the signature of
the Borrower or any other Guarantor where permitted by law. A carbon,
photographic or other reproduction of the Security Instruments or any financing
statement covering the Mortgaged Property or any part thereof shall be
sufficient as a financing statement where permitted by law.

     Section 8.12 Reserve Reports.

          (a) On or before March 1st and September 1st of each year, commencing
March 1, 2006, the Borrower shall furnish to the Administrative Agent and the
Lenders a Reserve Report. The Reserve Report as of January 1 of each year shall
be prepared by one or more Approved Petroleum Engineers, and the July 1 Reserve
Report of each year shall be prepared by or under the supervision of the chief
engineer of the Borrower who shall certify such Reserve Report to be true and
accurate and to have been prepared in accordance with the procedures used in the
immediately preceding January 1 Reserve Report.

          (b) In the event of an Interim Redetermination, the Borrower shall
furnish to the Administrative Agent and the Lenders a Reserve Report prepared by
or under the supervision of the chief engineer of the Borrower who shall certify
such Reserve Report to be true and accurate and to have been prepared in
accordance with the procedures used in the immediately preceding January 1
Reserve Report. For any Interim Redetermination requested by the Administrative
Agent or the Borrower pursuant to Section 2.07(b), the Borrower shall provide
such Reserve Report with an "as of" date as required by the Administrative Agent
as soon as possible, but in any event no later than thirty (30) days following
the receipt of such request.

          (c) With the delivery of each Reserve Report, the Borrower shall
provide to the Administrative Agent and the Lenders a certificate from a
Responsible Officer certifying that in all material respects: (i) the
information contained in the Reserve Report and any other information delivered
in connection therewith is true and correct and no statements or conclusions
exist in such Reserve Report which are based upon or include misleading
information or which fail to take into account material information regarding
the matters reported therein to the extent such misstatement, misleading
information or failure could reasonably be expected to have a Material Adverse
Effect, (ii) the Borrower or its Restricted Subsidiaries owns good and
defensible title to the Oil and Gas Properties evaluated in such Reserve Report
and such Properties are free of all Liens except for Liens permitted by Section
9.03, (iii) except as set forth on an exhibit to the certificate, on a net basis
there are no gas imbalances, take or pay or other prepayments in excess of the
volume specified in Section 7.19 with respect to its Oil and Gas Properties
evaluated in such Reserve Report which would require the Borrower or any
Restricted Subsidiary to deliver Hydrocarbons either generally or produced from
such Oil and Gas Properties at some future time without then or thereafter
receiving full payment therefor, (iv) none of their Oil and Gas Properties have
been sold since the date of the last Borrowing Base determination except as set
forth on an exhibit to the certificate, which


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certificate shall list all of its Oil and Gas Properties sold and in such detail
as reasonably required by the Administrative Agent, (v) attached to the
certificate is a list of all marketing agreements entered into subsequent to the
later of the date hereof or the most recently delivered Reserve Report which the
Borrower could reasonably be expected to have been obligated to list on Schedule
7.20 had such agreement been in effect on the date hereof and (vi) attached
thereto is a schedule of the Oil and Gas Properties evaluated by such Reserve
Report that are Mortgaged Properties and demonstrating the percentage of the
Borrowing Base that the value of such Mortgaged Properties represent in
compliance with Section 8.14(a).

     Section 8.13 Title Information.

          (a) On or before the delivery to the Administrative Agent and the
Lenders of each Reserve Report required by Section 8.12(a), the Borrower will
deliver title information in form and substance acceptable to the Administrative
Agent covering enough of the Oil and Gas Properties evaluated by such Reserve
Report that were not included in the immediately preceding Reserve Report, so
that the Administrative Agent shall be reasonably satisfied with the status of
title to the Oil and Gas Properties evaluated by such Reserve Report.

          (b) If the Borrower has provided title information for additional
Properties under Section 8.13(a), the Borrower shall, within 90 days of notice
from the Administrative Agent that title defects or exceptions exist with
respect to such additional Properties, either (i) cure any such title defects or
exceptions (including defects or exceptions as to priority) which are not
permitted by Section 9.03 raised by such information, (ii) substitute acceptable
Mortgaged Properties with no title defects or exceptions except for Excepted
Liens (other than Excepted Liens described in clauses (e), (g) and (h) of such
definition) having an equivalent value or (iii) deliver title information in
form and substance acceptable to the Administrative Agent so that the
Administrative Agent shall be reasonably satisfied with the status of title to
the Oil and Gas Properties evaluated by such Reserve Report.

          (c) If the Borrower is unable to cure any title defect requested by
the Administrative Agent or the Lenders to be cured within the 90-day period or
the Borrower does not comply with the requirements to provide acceptable title
information to the Oil and Gas Properties evaluated in the most recent Reserve
Report, such default shall not be a Default, but instead the Administrative
Agent and/or the Majority Lenders shall have the right to exercise the following
remedy in their sole discretion from time to time, and any failure to so
exercise this remedy at any time shall not be a waiver as to future exercise of
the remedy by the Administrative Agent or the Lenders. To the extent that the
Administrative Agent or the Majority Lenders are not satisfied with title to any
Mortgaged Property after the 90-day period has elapsed, the Administrative Agent
may send a notice to the Borrower and the Lenders that the then outstanding
Borrowing Base shall be reduced by an amount as determined by the Majority
Lenders to cause the Borrower to be in compliance with the requirement to
provide acceptable title information to the Oil and Gas Properties. This new
Borrowing Base shall become effective immediately after receipt of such notice.


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     Section 8.14 Additional Collateral; Additional Guarantors.

          (a) In connection with each redetermination of the Borrowing Base, the
Borrower shall review the Reserve Report and the list of current Mortgaged
Properties (as described in Section 8.12(c)) to ascertain whether the Mortgaged
Properties represent at least 80% of the total value of the Oil and Gas
Properties evaluated in the most recently completed Reserve Report after giving
effect to exploration and production activities, acquisitions, dispositions and
production. In the event that the Mortgaged Properties do not represent at least
80% of such total value, then the Borrower shall, and shall cause its Restricted
Subsidiaries to, grant, within thirty (30) days of delivery of the certificate
required under Section 8.12(c), to the Administrative Agent as security for the
Indebtedness a first-priority Lien interest (subject only to Excepted Liens of
the type described in clauses (a) to (d) and (f) of the definition thereof, but
subject to the provisos at the end of such definition) on additional Oil and Gas
Properties not already subject to a Lien of the Security Instruments such that
after giving effect thereto, the Mortgaged Properties will represent at least
80% of such total value. All such Liens will be created and perfected by and in
accordance with the provisions of deeds of trust, security agreements and
financing statements or other Security Instruments, all in form and substance
reasonably satisfactory to the Administrative Agent and in sufficient executed
(and acknowledged where necessary or appropriate) counterparts for recording
purposes. In order to comply with the foregoing, if any Restricted Subsidiary
places a Lien on its Oil and Gas Properties and such Restricted Subsidiary is
not a Guarantor, then it shall become a Guarantor and comply with Section
8.14(b). The Borrower agrees that it will not, and will not permit any
Restricted Subsidiary to, grant a Lien on any Property to secure the Second Lien
Term Loan Agreement without (i) giving prior written notice to the
Administrative Agent and (ii) granting to the Administrative Agent to secure the
Indebtedness a first-priority Lien on this same Property.

          (b) In the event that (i) the Borrower determines that any Restricted
Subsidiary is a Material Domestic Subsidiary or (ii) any Domestic Subsidiary
incurs or guarantees any Debt, the Borrower shall promptly cause such Restricted
Subsidiary to guarantee the Indebtedness pursuant to the Guaranty Agreement. In
connection with any such guaranty, the Borrower shall, or shall cause such
Restricted Subsidiary to, (A) execute and deliver a supplement to the Guaranty
Agreement executed by such Subsidiary, (B) pledge all of the Equity Interests of
such new Subsidiary (including, without limitation, delivery of original stock
certificates evidencing the Equity Interests of such Subsidiary, together with
an appropriate undated stock powers for each certificate duly executed in blank
by the registered owner thereof) and (C) execute and deliver such other
additional closing documents, certificates and legal opinions as shall
reasonably be requested by the Administrative Agent.

          (c) In the event that the Borrower or any Domestic Subsidiary becomes
the owner of a Foreign Subsidiary which has total assets in excess of
$1,000,000, then the Borrower shall promptly, or shall cause such Domestic
Subsidiary to promptly, guarantee the Indebtedness pursuant to the Guaranty
Agreement. In connection with any such guaranty, the Borrower shall, or shall
cause such Domestic Subsidiary to, (i) execute and deliver a supplement to the
Guaranty Agreement, (ii) pledge 65% of all the Equity Interests of such Foreign
Subsidiary (including, without limitation, delivery of original stock
certificates evidencing such Equity Interests of such Foreign Subsidiary,
together with appropriate stock powers for each certificate duly executed in
blank by the registered owner thereof) and (iii) execute and deliver such other
additional closing


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documents, certificates and legal opinions as shall reasonably be requested by
the Administrative Agent.

     Section 8.15 ERISA Compliance. The Borrower will promptly furnish and will
cause the Subsidiaries and any ERISA Affiliate to promptly furnish to the
Administrative Agent (i) promptly after the filing thereof with the United
States Secretary of Labor, the Internal Revenue Service or the PBGC, copies of
each annual and other report with respect to each Plan or any trust created
thereunder, (ii) immediately upon becoming aware of the occurrence of any ERISA
Event or of any "prohibited transaction," as described in section 406 of ERISA
or in section 4975 of the Code, in connection with any Plan or any trust created
thereunder, a written notice signed by the President or the principal Financial
Officer, the Subsidiary or the ERISA Affiliate, as the case may be, specifying
the nature thereof, what action the Borrower, the Subsidiary or the ERISA
Affiliate is taking or proposes to take with respect thereto, and, when known,
any action taken or proposed by the Internal Revenue Service, the Department of
Labor or the PBGC with respect thereto, and (iii) immediately upon receipt
thereof, copies of any notice of the PBGC's intention to terminate or to have a
trustee appointed to administer any Plan. With respect to each Plan (other than
a Multiemployer Plan), the Borrower will, and will cause each Subsidiary and
ERISA Affiliate to, (i) satisfy in full and in a timely manner, without
incurring any late payment or underpayment charge or penalty and without giving
rise to any Lien, all of the contribution and funding requirements of section
412 of the Code (determined without regard to subsections (d), (e), (f) and (k)
thereof) and of section 302 of ERISA (determined without regard to sections 303,
304 and 306 of ERISA), and (ii) pay, or cause to be paid, to the PBGC in a
timely manner, without incurring any late payment or underpayment charge or
penalty, all premiums required pursuant to sections 4006 and 4007 of ERISA.

     Section 8.16 Swap Agreements. The Borrower shall or shall cause one or more
of its Restricted Subsidiaries (which is a Guarantor) to maintain the hedged
position established by the Swap Agreements required under Section 6.01(q)
during the period specified therein and shall neither assign, terminate or
unwind any such Swap Agreements nor sell any Swap Agreements if the effect of
such action (when taken together with any other Swap Agreements executed
contemporaneously with the taking of such action) would have the effect of
canceling its positions under such Swap Agreements required hereby.

     Section 8.17 Unrestricted Subsidiaries. The Borrower:

          (a) will cause the management, business and affairs of each of the
Borrower and its Restricted Subsidiaries to be conducted in such a manner
(including, without limitation, by keeping separate books of account, furnishing
separate financial statements of Unrestricted Subsidiaries to creditors and
potential creditors thereof and by not permitting Properties of the Borrower and
its respective Restricted Subsidiaries to be commingled) so that each
Unrestricted Subsidiary that is a corporation will be treated as a corporate
entity separate and distinct from Borrower and the Restricted Subsidiaries.

          (b) will not, and will not permit any of the Restricted Subsidiaries
to, incur, assume, guarantee or be or become liable for any Debt of any of the
Unrestricted Subsidiaries.


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<PAGE>

          (c) will not permit any Unrestricted Subsidiary to hold any Equity
Interest in, or any Debt of, the Borrower or any Restricted Subsidiary.

     Section 8.18 Marketing Activities. The Borrower will not, and will not
permit any of its Restricted Subsidiaries to, engage in marketing activities for
any Hydrocarbons or enter into any contracts related thereto other than (i)
contracts for the sale of Hydrocarbons scheduled or reasonably estimated to be
produced from their proved Oil and Gas Properties during the period of such
contract, (ii) contracts for the sale of Hydrocarbons scheduled or reasonably
estimated to be produced from proved Oil and Gas Properties of third parties
during the period of such contract associated with the Oil and Gas Properties of
the Borrower and its Restricted Subsidiaries that the Borrower or one of its
Restricted Subsidiaries has the right to market pursuant to joint operating
agreements, unitization agreements or other similar contracts that are usual and
customary in the oil and gas business and (iii) other contracts for the purchase
and/or sale of Hydrocarbons of third parties (A) which have generally offsetting
provisions (i.e. corresponding pricing mechanics, delivery dates and points and
volumes) such that no "position" is taken and (B) for which appropriate credit
support has been taken to alleviate the material credit risks of the
counterparty thereto.

                                   ARTICLE IX
                               NEGATIVE COVENANTS

     Until the Commitments have expired or terminated and the principal of and
interest on each Loan and all fees payable hereunder and all other amounts
payable under the Loan Documents have been paid in full and all Letters of
Credit have expired or terminated and all LC Disbursements shall have been
reimbursed, the Borrower covenants and agrees with the Lenders that:

     Section 9.01 Financial Covenants.

          (a) Interest Coverage Ratio. The Borrower will not, as of the last day
of any fiscal quarter, permit its ratio of EBITDA for the period of four fiscal
quarters then ending to Interest Expense for such period to be less than 2.5 to
1.0.

          (b) Ratio of Total Debt to EBITDA. The Borrower will not, at any time,
permit its ratio of Total Debt as of such time to EBITDA for the period of four
fiscal quarters ending on the last day of the fiscal quarter immediately
preceding the date of determination for which financial statements are available
to be greater than 4.0 to 1.0.

          (c) Current Ratio. The Borrower will not permit, as of the last day of
any fiscal quarter, its ratio of (i) consolidated current assets including the
unused amount of the total Commitments, to (ii) consolidated current liabilities
to be less than 1.0 to 1.0.

     Section 9.02 Debt. The Borrower will not, and will not permit any
Restricted Subsidiary to, incur, create, assume or suffer to exist any Debt,
except:

          (a) the Loans, any Notes or other Indebtedness arising under the Loan
Documents or any guaranty of or suretyship arrangement for the Loans, any Notes
or other Indebtedness arising under the Loan Documents.


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<PAGE>

          (b) Debt of the Borrower and its Restricted Subsidiaries existing on
the date hereof that is reflected in the Financial Statements.

          (c) accounts payable and accrued expenses, liabilities or other
obligations to pay the deferred purchase price of Property or services, from
time to time incurred in the ordinary course of business which are not greater
than sixty (60) days past the date of invoice or delinquent or which are being
contested in good faith by appropriate action and for which adequate reserves
have been maintained in accordance with GAAP.

          (d) Debt (including guarantees) under Capital Leases not to exceed
$2,000,000.

          (e) Debt associated with bonds or surety obligations required by
Governmental Requirements in connection with the operation of the Oil and Gas
Properties.

          (f) intercompany Debt between the Borrower and any Restricted
Subsidiary or between Restricted Subsidiaries to the extent permitted by Section
9.05(g); provided that such Debt is not held, assigned, transferred, negotiated
or pledged to any Person other than the Borrower or one of its Wholly-Owned
Subsidiaries, and, provided further, that any such Debt owed by either the
Borrower or a Guarantor shall be subordinated to the Indebtedness on terms set
forth in the Guaranty Agreement.

          (g) endorsements of negotiable instruments for collection in the
ordinary course of business.

          (h) Debt (i) under the Senior Unsecured Notes, the principal amount of
which does not exceed $130,000,000 in the aggregate and any Permitted
Refinancing Debt in respect thereof and (ii) under the Second Lien Term Loan
Agreement and any guarantees thereof, the principal amount of which Debt under
clause (ii) of this Section 9.02(h) does not exceed $150,000,000 in the
aggregate provided that the Borrower may incur an additional $50,000,000 of Debt
under the Second Lien Term Loan Agreement if (i) the Borrower provides the
Administrative Agent not less than thirty (30) days prior written notice and
(ii) the Majority Lenders shall have the right to redetermine the Borrowing Base
then in effect pursuant to Section 2.07(e).

          (i) other Debt not to exceed $2,000,000 in the aggregate at any one
time outstanding.

     Section 9.03 Liens. The Borrower will not, and will not permit any
Restricted Subsidiary to, create, incur, assume or permit to exist any Lien on
any of its Properties (now owned or hereafter acquired), except:

          (a) Liens securing the payment of any Indebtedness.

          (b) Excepted Liens.

          (c) Liens securing Capital Leases permitted by Section 9.02(d) but
only on the Property under lease.


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<PAGE>

          (d) Liens on Letters of Credit issued hereunder pledged to secure
obligations under any Swap Agreement permitted by Section 9.19.

          (e) Liens on Property not constituting collateral for the Indebtedness
and not otherwise permitted by the foregoing clauses of this Section 9.03;
provided that the aggregate principal or face amount of all Debt secured under
this Section 9.03(e) shall not exceed $2,000,000 at any time.

          (f) Liens on Property securing the Second Lien Term Loan Agreement
permitted by Section 9.02(h) provided; however, that (i) such Liens securing the
Second Lien Term Loan Agreement and any guarantees thereof are subordinated on
terms satisfactory to the Administrative Agent, (ii) each and every Lien
securing the Second Lien Term Loan Agreement shall be subordinate to the Liens
securing the Indebtedness, this Agreement and the other Loan Documents and (iii)
no Lien shall be granted on any Property to secure the Second Lien Term Loan
Agreement unless the Lien is also being granted to secure the Indebtedness, this
Agreement and the other Loan Documents.

     Section 9.04 Dividends, Distributions and Redemptions; Repayment of Senior
Unsecured Notes and Second Lien Term Loan Agreement.

          (a) Restricted Payments. The Borrower will not, and will not permit
any of its Subsidiaries to, declare or make, or agree to pay or make, directly
or indirectly, any Restricted Payment, return any capital to its stockholders or
make any distribution of its Property to its Equity Interest holders, except (i)
the Borrower may declare and pay dividends with respect to its Equity Interests
payable solely in additional shares of its Equity Interests (other than
Disqualified Capital Stock), (ii) Subsidiaries may declare and pay dividends
ratably with respect to their Equity Interests, (iii) the Borrower may make
Restricted Payments pursuant to and in accordance with stock option plans or
other benefit plans for management or employees of the Borrower and its
Subsidiaries, (iv) the Borrower may declare and pay scheduled cash dividends
with respect to its Designated Preferred Stock at a coupon not to exceed 8% per
annum, provided that at the time such dividend is declared and paid (1) no
Borrowing Base deficiency exists and (2) no Event of Default exists or would
result from the payment of such dividend, (v) the Borrower may redeem,
repurchase or otherwise acquire its Designated Preferred Stock, provided that at
the time such redemption, repurchase or acquisition (1) no Borrowing Base
deficiency exists, (2) no Event of Default exists or would result from the
redemption, repurchase or acquisition and (3) the aggregate consideration paid
does not exceed $6,000,000 and (vi) the Borrower may terminate its directors' or
employees' option agreements or restricted stock agreements under any of
Borrower's incentive stock plans provided; however, that the aggregate amounts
paid in respect thereof do not exceed $1,000,000.

          (b) Redemption of Senior Unsecured Notes and Second Lien Term Loan
Agreement; Amendment of Senior Indenture and Second Lien Term Loan Documents.
The Borrower will not, and will not permit any Restricted Subsidiary to, prior
to the date that is ninety-one (91) days after the Maturity Date: (i) call, make
or offer to make any optional or voluntary Redemption of or otherwise optionally
or voluntarily Redeem (whether in whole or in part) the Senior Unsecured Notes
or the Second Lien Term Loan Agreement or any Permitted Refinancing Debt in
respect thereof; provided that the Borrower may (A) optionally prepay the


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Second Lien Term Loan Agreement if (1) no Default or Event of Default has
occurred and is continuing or would exist after giving effect to such
prepayment, and (2) after giving effect to each prepayment, the Borrower would
have at least $15,000,000 of unused availability under the Commitments, and/or
(B) prepay the Senior Unsecured Notes and any premiums relating thereto (1) with
the proceeds of any Permitted Refinancing Debt or with the Net Cash Proceeds of
any sale of Equity Interests (other than Disqualified Capital Stock) of the
Borrower or (2) pursuant to the terms of the Senior Indenture relating to a
"change of control" and the redemption and/or repayment of the Senior Unsecured
Notes, provided that such prepayment of the Senior Unsecured Notes and any
premiums relating thereto in (2) above does not exceed $5,000,000 or (ii) amend,
modify, waive or otherwise change, consent or agree to any amendment,
modification, waiver or other change to, any of the terms of the Senior
Unsecured Notes, the Second Lien Term Loan Agreement, the Second Lien Term Loan
Documents, any Permitted Refinancing Debt or the Senior Indenture if (A) the
effect thereof would be to shorten its maturity or average life or increase the
amount of any payment of principal thereof or increase the rate or shorten any
period for payment of interest thereon or (B) such action requires the payment
of a consent fee (howsoever described) except consent fees may be paid under the
Second Lien Term Loan Agreement in excess of 1.0% during any 12 month period,
provided that the foregoing shall not prohibit the execution of other indentures
or agreements in connection with the issuance of Permitted Refinancing Debt or
the execution of supplemental indentures to add guarantors if required by the
terms of any Senior Indenture provided such Person complies with Section
8.14(b).

     Section 9.05 Investments, Loans and Advances. The Borrower will not, and
will not permit any Restricted Subsidiary to, make or permit to remain
outstanding any Investments in or to any Person, except that the foregoing
restriction shall not apply to:

          (a) Investments reflected in the Financial Statements or which are
disclosed to the Lenders in Schedule 9.05.

          (b) accounts receivable arising in the ordinary course of business.

          (c) direct obligations of the United States or any agency thereof, or
obligations guaranteed by the United States or any agency thereof, in each case
maturing within one year from the date of creation thereof.

          (d) commercial paper maturing within one year from the date of
creation thereof rated in the highest grade by S&P or Moody's.

          (e) deposits maturing within one year from the date of creation
thereof with, including certificates of deposit issued by, any Lender or any
office located in the United States of any other bank or trust company which is
organized under the laws of the United States or any state thereof, has capital,
surplus and undivided profits aggregating at least $100,000,000 (as of the date
of such bank or trust company's most recent financial reports) and has a short
term deposit rating of no lower than A2 or P2, as such rating is set forth from
time to time, by S&P or Moody's, respectively or, in the case of any Foreign
Subsidiary, a bank organized in a jurisdiction in which the Foreign Subsidiary
conducts operations having assets in excess of $500,000,000 (or its equivalent
in another currency).


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          (f) deposits in money market funds investing exclusively in
Investments described in Section 9.05(c), Section 9.05(d) or Section 9.05(e).

          (g) Investments (i) made by the Borrower in or to the Guarantors, (ii)
made by any Restricted Subsidiary in or to the Borrower or any Guarantor, (iii)
made by the Borrower or any Restricted Subsidiary in or to all other Domestic
Subsidiaries which are not Guarantors in an aggregate amount at any one time
outstanding not to exceed $400,000, and (iv) made by the Borrower or any
Restricted Subsidiary in or to any Foreign Subsidiary in an aggregate amount at
any one time outstanding not to exceed $200,000.

          (h) subject to the limits in Section 9.07, Investments (including,
without limitation, capital contributions) in general or limited partnerships or
other types of entities (each a "venture") entered into by the Borrower or a
Restricted Subsidiary with others in the ordinary course of business; provided
that (i) any such venture is engaged exclusively in oil and gas exploration,
development, production, processing and related activities, including
transportation, (ii) the interest in such venture is acquired in the ordinary
course of business and on fair and reasonable terms and (iii) such venture
interests acquired and capital contributions made (valued as of the date such
interest was acquired or the contribution made) do not exceed, in the aggregate
at any time outstanding an amount equal to $1,000,000.

          (i) subject to the limits in Section 9.07, Investments in direct
ownership interests in additional Oil and Gas Properties and gas gathering
systems related thereto or related to farm-out, farm-in, joint operating, joint
venture or area of mutual interest agreements, gathering systems, pipelines or
other similar arrangements which are usual and customary in the oil and gas
exploration and production business located within the geographic boundaries of
the United States of America.

          (j) loans or advances to employees, officers or directors in the
ordinary course of business of the Borrower or any of its Restricted
Subsidiaries, in each case only as permitted by applicable law, including
Section 402 of the Sarbanes Oxley Act of 2002, but in any event not to exceed
$100,000 in the aggregate at any time.

          (k) Investments in stock, obligations or securities received in
settlement of debts arising from Investments permitted under this Section 9.05
owing to the Borrower or any Restricted Subsidiary as a result of a bankruptcy
or other insolvency proceeding of the obligor in respect of such debts or upon
the enforcement of any Lien in favor of the Borrower or any of its Restricted
Subsidiaries; provided that the Borrower shall give the Administrative Agent
prompt written notice in the event that the aggregate amount of all Investments
held at any one time under this Section 9.05(k) exceeds $1,000,000.

          (l) Investments in Unrestricted Subsidiaries, provided that the
aggregate amount of all such Investments at any one time shall not exceed
$10,000,000 (or its equivalent in other currencies as of the date of
Investment).

     Section 9.06 Designation and Conversion of Restricted and Unrestricted
Subsidiaries; Debt of Unrestricted Subsidiaries


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<PAGE>

          (a) Unless designated as an Unrestricted Subsidiary on Schedule 7.15
as of the date hereof or thereafter, assuming compliance with Section 9.06(b),
any Person that becomes a Subsidiary of the Borrower or any of its Restricted
Subsidiaries shall be classified as a Restricted Subsidiary.

          (b) The Borrower may designate by written notification thereof to the
Administrative Agent, any Restricted Subsidiary, including a newly formed or
newly acquired Subsidiary, as an Unrestricted Subsidiary if (i) prior, and after
giving effect, to such designation, neither a Default nor a Borrowing Base
deficiency would exist and (ii) such designation is deemed to be an Investment
in an Unrestricted Subsidiary in an amount equal to the fair market value as of
the date of such designation of the Borrower's direct and indirect ownership
interest in such Subsidiary and such Investment would be permitted to be made at
the time of such designation under Section 9.05(l). Except as provided in this
Section 9.06(b), no Restricted Subsidiary may be redesignated as an Unrestricted
Subsidiary.

          (c) The Borrower may designate any Unrestricted Subsidiary to be a
Restricted Subsidiary if after giving effect to such designation, (i) the
representations and warranties of the Borrower and its Restricted Subsidiaries
contained in each of the Loan Documents are true and correct on and as of such
date as if made on and as of the date of such redesignation (or, if stated to
have been made expressly as of an earlier date, were true and correct as of such
date), (ii) no Default would exist and (iii) the Borrower complies with the
requirements of Section 8.14, Section 8.17 and Section 9.16. Any such
designation shall be treated as a cash dividend in an amount equal to the lesser
of the fair market value of the Borrower's direct and indirect ownership
interest in such Subsidiary or the amount of the Borrower's cash investment
previously made for purposes of the limitation on Investments under Section
9.05(l).

          (d) The Borrower shall not permit the aggregate principal amount of
all Non-Recourse Debt outstanding at any one time to exceed $20,000,000.

     Section 9.07 Nature of Business; International Operations. Neither the
Borrower nor any Restricted Subsidiary will allow any material change to be made
in the character of its business as an independent oil and gas exploration and
production company. From and after the date hereof, the Borrower and its
Domestic Subsidiaries will not acquire or make any other expenditure (whether
such expenditure is capital, operating or otherwise) in or related to, any Oil
and Gas Properties not located within the geographical boundaries of the United
States.

     Section 9.08 Limitation on Leases. Neither the Borrower nor any Restricted
Subsidiary will create, incur, assume or suffer to exist any obligation for the
payment of rent or hire of Property of any kind whatsoever (real or personal but
excluding Capital Leases and leases of Hydrocarbon Interests), under leases or
lease agreements which would cause the aggregate amount of all payments made by
the Borrower and the Restricted Subsidiaries pursuant to all such leases or
lease agreements, including, without limitation, any residual payments at the
end of any lease, to exceed $5,000,000 in any period of twelve consecutive
calendar months during the life of such leases.

     Section 9.09 Proceeds of Notes. The Borrower will not permit the proceeds
of the Loans to be used for any purpose other than those permitted by Section
7.22. Neither the


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Borrower nor any Person acting on behalf of the Borrower has taken or will take
any action which might cause any of the Loan Documents to violate Regulations T,
U or X or any other regulation of the Board or to violate Section 7 of the
Securities Exchange Act of 1934 or any rule or regulation thereunder, in each
case as now in effect or as the same may hereinafter be in effect. If requested
by the Administrative Agent, the Borrower will furnish to the Administrative
Agent and each Lender a statement to the foregoing effect in conformity with the
requirements of FR Form U-1 or such other form referred to in Regulation U,
Regulation T or Regulation X of the Board, as the case may be.

     Section 9.10 ERISA Compliance. The Borrower and the Subsidiaries will not
at any time:

          (a) engage in, or permit any ERISA Affiliate to engage in, any
transaction in connection with which the Borrower, a Subsidiary or any ERISA
Affiliate could be subjected to either a civil penalty assessed pursuant to
subsections (c), (i) or (l) of section 502 of ERISA or a tax imposed by Chapter
43 of Subtitle D of the Code.

          (b) terminate, or permit any ERISA Affiliate to terminate, any Plan in
a manner, or take any other action with respect to any Plan, which could result
in any liability of the Borrower, a Subsidiary or any ERISA Affiliate to the
PBGC.

          (c) fail to make, or permit any ERISA Affiliate to fail to make, full
payment when due of all amounts which, under the provisions of any Plan,
agreement relating thereto or applicable law, the Borrower, a Subsidiary or any
ERISA Affiliate is required to pay as contributions thereto.

          (d) permit to exist, or allow any ERISA Affiliate to permit to exist,
any accumulated funding deficiency within the meaning of section 302 of ERISA or
section 412 of the Code, whether or not waived, with respect to any Plan.

          (e) permit, or allow any ERISA Affiliate to permit, the actuarial
present value of the benefit liabilities under any Plan maintained by the
Borrower, a Subsidiary or any ERISA Affiliate which is regulated under Title IV
of ERISA to exceed the current value of the assets (computed on a plan
termination basis in accordance with Title IV of ERISA) of such Plan allocable
to such benefit liabilities. The term "actuarial present value of the benefit
liabilities" shall have the meaning specified in section 4041 of ERISA.

          (f) contribute to or assume an obligation to contribute to, or permit
any ERISA Affiliate to contribute to or assume an obligation to contribute to,
any Multiemployer Plan.

          (g) acquire, or permit any ERISA Affiliate to acquire, an interest in
any Person that causes such Person to become an ERISA Affiliate with respect to
the Borrower or a Subsidiary or with respect to any ERISA Affiliate of the
Borrower or a Subsidiary if such Person sponsors, maintains or contributes to,
or at any time in the six-year period preceding such acquisition has sponsored,
maintained, or contributed to, (i) any Multiemployer Plan, or (ii) any other
Plan that is subject to Title IV of ERISA under which the actuarial present
value of the benefit liabilities under such Plan exceeds the current value of
the assets (computed on a plan


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termination basis in accordance with Title IV of ERISA) of such Plan allocable
to such benefit liabilities.

          (h) incur, or permit any ERISA Affiliate to incur, a liability to or
on account of a Plan under sections 515, 4062, 4063, 4064, 4201 or 4204 of
ERISA.

          (i) contribute to or assume an obligation to contribute to, or permit
any ERISA Affiliate to contribute to or assume an obligation to contribute to,
any employee welfare benefit plan, as defined in section 3(1) of ERISA,
including, without limitation, any such plan maintained to provide benefits to
former employees of such entities, that may not be terminated by such entities
in their sole discretion at any time without any material liability.

          (j) amend, or permit any ERISA Affiliate to amend, a Plan resulting in
an increase in current liability such that the Borrower, a Subsidiary or any
ERISA Affiliate is required to provide security to such Plan under section
401(a)(29) of the Code.

     Section 9.11 Sale or Discount of Receivables. Except for receivables
obtained by the Borrower or any Restricted Subsidiary out of the ordinary course
of business or the settlement of joint interest billing accounts in the ordinary
course of business or discounts granted to settle collection of accounts
receivable or the sale of defaulted accounts arising in the ordinary course of
business in connection with the compromise or collection thereof and not in
connection with any financing transaction, neither the Borrower nor any
Restricted Subsidiary will discount or sell (with or without recourse) any of
its notes receivable or accounts receivable.

     Section 9.12 Mergers, Etc. With the exception of the Mergers, the Borrower
will not, and will not permit any Restricted Subsidiary to, merge into or
consolidate with any other Person, or permit any other Person to merge into or
consolidate with it, or sell, transfer, lease or otherwise dispose of (whether
in one transaction or in a series of transactions) all or substantially all of
its Property to any other Person (whether now owned or hereafter acquired) (any
such transaction, a "consolidation"), or liquidate or dissolve; provided that
the Borrower or any Restricted Subsidiary may participate in a consolidation
with any other Person; provided that:

          (a) any Restricted Subsidiary (including a Foreign Subsidiary) may
participate in a consolidation with the Borrower (provided that the Borrower
shall be the continuing or surviving corporation) or any other Restricted
Subsidiary that is a Domestic Subsidiary (provided that if one of such parties
to the consolidation is a Foreign Subsidiary, such Domestic Subsidiary shall be
the continuing or surviving Person) and if one of such Restricted Subsidiaries
is a Wholly-Owned Subsidiary, then the surviving Person shall be a Wholly-Owned
Subsidiary; and

          (b) any Foreign Subsidiary of the Borrower may participate in a
consolidation with any one or more Foreign Subsidiaries; provided that if one of
such Foreign Subsidiaries is a Wholly-Owned Subsidiary, the survivor shall be a
Wholly-Owned Subsidiary.

     Section 9.13 Sale of Properties. The Borrower will not, and will not permit
any Restricted Subsidiary to, sell, assign, farm-out, convey or otherwise
transfer any Property except for (a) the sale of Hydrocarbons in the ordinary
course of business; (b) farmouts of undeveloped acreage and assignments in
connection with such farmouts; (c) the sale or transfer of equipment that is no
longer necessary for the business of the Borrower or such Restricted Subsidiary
or is


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replaced by equipment of at least comparable value and use; (d) the sale,
transfer or other disposition of Equity Interests in Unrestricted Subsidiaries;
(e) the sale or other disposition (including Casualty Events) of any Oil and Gas
Property or any interest therein or any Restricted Subsidiary owning Oil and Gas
Properties; provided that (i) 100% of the consideration received in respect of
such sale or other disposition shall be cash, (ii) the consideration received in
respect of such sale or other disposition shall be equal to or greater than the
fair market value of the Oil and Gas Property, interest therein or Restricted
Subsidiary subject of such sale or other disposition (as reasonably determined
by the board of directors of the Borrower and, if requested by the
Administrative Agent, the Borrower shall deliver a certificate of a Responsible
Officer of the Borrower certifying to that effect), (iii) if such sale or other
disposition of Oil and Gas Property or Restricted Subsidiary owning Oil and Gas
Properties included in the most recently delivered Reserve Report during any
period between two successive Scheduled Redetermination Dates is sold for a
price in excess of 7% of the Borrowing Base then in effect, individually or in
the aggregate, then the Borrowing Base shall be reduced, effective immediately
upon such sale or disposition, by an amount equal to the value, if any, assigned
such Property in the most recently delivered Reserve Report and (iv) if any such
sale or other disposition is of a Restricted Subsidiary owning Oil and Gas
Properties, such sale or other disposition shall include all the Equity
Interests of such Restricted Subsidiary; and (f) sales and other dispositions of
Properties not regulated by Section 9.13(a) to (e) having a fair market value
not to exceed $4,000,000 during any 12-month period.

     Section 9.14 Environmental Matters. The Borrower will not, and will not
permit any Restricted Subsidiary to, cause or permit any of its Property to be
in violation of, or do anything or permit anything to be done which will subject
any such Property to any Remedial Work under any Environmental Laws, assuming
disclosure to the applicable Governmental Authority of all relevant facts,
conditions and circumstances, if any, pertaining to such Property where such
violations or remedial obligations could reasonably be expected to have a
Material Adverse Effect.

     Section 9.15 Transactions with Affiliates. The Borrower will not, and will
not permit any Restricted Subsidiary to, enter into any transaction, including,
without limitation, any purchase, sale, lease or exchange of Property or the
rendering of any service, with any Affiliate (other than the Guarantors and
Wholly-Owned Subsidiaries of the Borrower) unless such transactions are
otherwise permitted under this Agreement and are upon fair and reasonable terms
no less favorable to it than it would obtain in a comparable arm's length
transaction with a Person not an Affiliate.

     Section 9.16 Subsidiaries. The Borrower will not, and will not permit any
Restricted Subsidiary to, create or acquire any additional Restricted Subsidiary
or redesignate an Unrestricted Subsidiary as a Restricted Subsidiary unless the
Borrower gives written notice to the Administrative Agent of such creation or
acquisition and complies with Section 8.14(b) and Section 8.14(c). The Borrower
shall not, and shall not permit any Restricted Subsidiary to, sell, assign or
otherwise dispose of any Equity Interests in any Restricted Subsidiary except in
compliance with Section 9.13(e).

     Section 9.17 Negative Pledge Agreements; Dividend Restrictions. The
Borrower will not, and will not permit any Restricted Subsidiary to, create,
incur, assume or suffer to exist any


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contract, agreement or understanding (other than this Agreement, the Security
Instruments or Capital Leases creating Liens permitted by Section 9.03(c)) which
in any way prohibits or restricts the granting, conveying, creation or
imposition of any Lien on any of its Property in favor of the Administrative
Agent and the Lenders or restricts any Restricted Subsidiary from paying
dividends or making distributions to the Borrower or any Guarantor, or which
requires the consent of or notice to other Persons in connection therewith.

     Section 9.18 Gas Imbalances, Take-or-Pay or Other Prepayments. The Borrower
will not allow gas imbalances, take-or-pay or other prepayments with respect to
the Oil and Gas Properties of the Borrower or any Restricted Subsidiary that
would require the Borrower or such Restricted Subsidiary to deliver Hydrocarbons
at some future time without then or thereafter receiving full payment therefor
to exceed 1.5 bcf of gas (on an mcf equivalent basis) in the aggregate.

     Section 9.19 Swap Agreements. The Borrower will not, and will not permit
any Restricted Subsidiary to, enter into any Swap Agreements with any Person
other than (a) Swap Agreements in respect of commodities (i) with an Approved
Counterparty and (ii) the notional volumes for which (when aggregated with other
commodity Swap Agreements then in effect other than basis differential swaps on
volumes already hedged pursuant to other Swap Agreements) do not exceed, as of
the date such Swap Agreement is executed, 85% of the reasonably anticipated
projected production (as shown in the Borrower's most recent Engineering Report)
from proved, developed, producing Oil and Gas Properties for each month during
the period during which such Swap Agreement is in effect for each of crude oil
and natural gas, calculated separately, (b) Swap Agreements in respect of
interest rates with an Approved Counterparty, as follows: (i) Swap Agreements
effectively converting interest rates from fixed to floating, the notional
amounts of which (when aggregated with all other Swap Agreements of the Borrower
and its Restricted Subsidiaries then in effect effectively converting interest
rates from fixed to floating) do not exceed 50% of the then outstanding
principal amount of the Borrower's Debt for borrowed money which bears interest
at a fixed rate and (ii) Swap Agreements effectively converting interest rates
from floating to fixed, the notional amounts of which (when aggregated with all
other Swap Agreements of the Borrower and its Restricted Subsidiaries then in
effect effectively converting interest rates from floating to fixed) do not
exceed 75% of the then outstanding principal amount of the Borrower's Debt for
borrowed money which bears interest at a floating rate, and (c) Swap Agreements
required under Section 6.01(q). In no event shall any Swap Agreement contain any
requirement, agreement or covenant for the Borrower or any Restricted Subsidiary
to post collateral or margin to secure their obligations under such Swap
Agreement or to cover market exposures except to the extent permitted by Section
9.03(d).

     Section 9.20 Merger Documents. The Borrower will not, and will not permit
any of its Subsidiaries to, amend, modify or supplement any of the Merger
Documents if the effect thereof could reasonably be expected to have a Material
Adverse Effect (and provided that the Borrower promptly furnishes to the
Administrative Agent a copy of such amendment, modification or supplement).


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                                    ARTICLE X
                           EVENTS OF DEFAULT; REMEDIES

     Section 10.01 Events of Default. One or more of the following events shall
constitute an "Event of Default":

          (a) the Borrower shall fail to pay any principal of any Loan or any
reimbursement obligation in respect of any LC Disbursement when and as the same
shall become due and payable, whether at the due date thereof or at a date fixed
for prepayment thereof or otherwise.

          (b) the Borrower shall fail to pay any interest on any Loan or any fee
or any other amount (other than an amount referred to in Section 10.01(a))
payable under any Loan Document, when and as the same shall become due and
payable, and such failure shall continue unremedied for a period of three
Business Days.

          (c) any representation or warranty made or deemed made by or on behalf
of the Borrower or any Restricted Subsidiary in or in connection with any Loan
Document or any amendment or modification of any Loan Document or waiver under
such Loan Document, or in any report, certificate, financial statement or other
document furnished pursuant to or in connection with any Loan Document or any
amendment or modification thereof or waiver thereunder, shall prove to have been
incorrect when made or deemed made.

          (d) the Borrower or any Restricted Subsidiary shall fail to observe or
perform any covenant, condition or agreement contained in Section 8.01(i),
Section 8.01(m), Section 8.01(p), Section 8.02, Section 8.03, Section 8.15 or in
ARTICLE IX.

          (e) the Borrower or any Restricted Subsidiary shall fail to observe or
perform any covenant, condition or agreement contained in this Agreement (other
than those specified in Section 10.01(a), Section 10.01(b) or Section 10.01(d))
or any other Loan Document, and such failure shall continue unremedied for a
period of 30 days after the earlier to occur of (A) notice thereof from the
Administrative Agent to the Borrower (which notice will be given at the request
of any Lender) or (B) a Responsible Officer of the Borrower or such Restricted
Subsidiary otherwise becoming aware of such default.

          (f) the Borrower or any Restricted Subsidiary shall fail to make any
payment (whether of principal or interest and regardless of amount) in respect
of any Material Indebtedness prior to the longer of (i) three (3) Business Days
after the same shall become due and payable or (ii) the expiration of any
applicable grace period.

          (g) any event or condition occurs that results in any Material
Indebtedness becoming due prior to its scheduled maturity or that enables or
permits (with or without the giving of notice, the lapse of time or both) the
holder or holders of any Material Indebtedness or any trustee or agent on its or
their behalf to cause any Material Indebtedness to become due, or to require the
Redemption thereof or any offer to Redeem to be made in respect thereof, prior
to its scheduled maturity or require the Borrower or any Restricted Subsidiary
to make an offer in respect thereof.


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          (h) an involuntary proceeding shall be commenced or an involuntary
petition shall be filed seeking (i) liquidation, reorganization or other relief
in respect of the Borrower or any Restricted Subsidiary or its debts, or of a
substantial part of its assets, under any Federal, state or foreign bankruptcy,
insolvency, receivership or similar law now or hereafter in effect or (ii) the
appointment of a receiver, trustee, custodian, sequestrator, conservator or
similar official for the Borrower or any Restricted Subsidiary or for a
substantial part of its assets, and, in any such case, such proceeding or
petition shall continue undismissed for 30 days or an order or decree approving
or ordering any of the foregoing shall be entered.

          (i) the Borrower or any Restricted Subsidiary shall (i) voluntarily
commence any proceeding or file any petition seeking liquidation, reorganization
or other relief under any Federal, state or foreign bankruptcy, insolvency,
receivership or similar law now or hereafter in effect, (ii) consent to the
institution of, or fail to contest in a timely and appropriate manner, any
proceeding or petition described in Section 10.01(h), (iii) apply for or consent
to the appointment of a receiver, trustee, custodian, sequestrator, conservator
or similar official for the Borrower or any Restricted Subsidiary or for a
substantial part of its assets, (iv) file an answer admitting the material
allegations of a petition filed against it in any such proceeding, (v) make a
general assignment for the benefit of creditors or (vi) take any action for the
purpose of effecting any of the foregoing.

          (j) the Borrower or any Restricted Subsidiary shall become unable,
admit in writing its inability or fail generally to pay its debts as they become
due.

          (k) one or more judgments for the payment of money in an aggregate
amount in excess of $2,000,000 (to the extent not covered by independent third
party insurance provided by insurers of the highest claims paying rating or
financial strength as to which the insurer does not dispute coverage and is not
subject to an insolvency proceeding) shall be rendered against the Borrower, any
Restricted Subsidiary or any combination thereof and the same shall remain
undischarged for a period of 30 consecutive days during which execution shall
not be effectively stayed, or any action shall be legally taken by a judgment
creditor to attach or levy upon any assets of the Borrower or any Restricted
Subsidiary to enforce any such judgment.

          (l) the Loan Documents after delivery thereof shall for any reason,
except to the extent permitted by the terms thereof, cease to be in full force
and effect and valid, binding and enforceable in accordance with their terms
against the Borrower or a Guarantor party thereto or shall be repudiated by any
of them, or cease to create a valid and perfected Lien of the priority required
thereby on any of the collateral purported to be covered thereby, except to the
extent permitted by the terms of this Agreement, or the Borrower or any
Restricted Subsidiary or any of their Affiliates shall so state in writing.

          (m) an Intercreditor Agreement, after delivery thereof shall for any
reason, except to the extent permitted by the terms thereof, cease to be in full
force and effect and valid, binding and enforceable in accordance with its terms
against the Borrower, any party thereto or holder of the Debt subordinated
thereby or shall be repudiated by any of them, or cause the payment of the
obligations of the Senior Unsecured Notes to be senior in right to the payment
of obligations of this Credit Agreement or the Second Lien Term Loan Agreement,
or any payment by the Borrower or any Guarantor in violation of the terms of the
Intercreditor Agreement.


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          (n) an ERISA Event shall have occurred that, in the opinion of the
Majority Lenders, when taken together with all other ERISA Events that have
occurred, could reasonably be expected to result in liability of the Borrower
and its Subsidiaries in an aggregate amount exceeding (i) $500,000 in any year
or (ii) $1,000,000 for all periods.

          (o) a Change in Control shall occur.

     Section 10.02 Remedies.

          (a) In the case of an Event of Default other than one described in
Section 10.01(h), Section 10.01(i) or Section 10.01(j), at any time thereafter
during the continuance of such Event of Default, the Administrative Agent, at
the direction of the Majority Lenders, shall, by notice to the Borrower, take
either or both of the following actions, at the same or different times: (i)
terminate the Commitments, and thereupon the Commitments shall terminate
immediately, and (ii) declare the Notes, if any, and the Loans then outstanding
to be due and payable in whole (or in part, in which case any principal not so
declared to be due and payable may thereafter be declared to be due and
payable), and thereupon the principal of the Loans so declared to be due and
payable, together with accrued interest thereon and all fees and other
obligations of the Borrower and the Guarantors accrued hereunder and under the
Loans, the Notes, if any, and the other Loan Documents (including, without
limitation, the payment of cash collateral to secure the LC Exposure as provided
in Section 2.08(j)), shall become due and payable immediately, without
presentment, demand, protest, notice of intent to accelerate, notice of
acceleration or other notice of any kind, all of which are hereby waived by the
Borrower and each Guarantor; and in case of an Event of Default described in
Section 10.01(h), Section 10.01(i) or Section 10.01(j), the Commitments shall
automatically terminate and the Notes, if any, and the principal of the Loans
then outstanding, together with accrued interest thereon and all fees and the
other obligations of the Borrower and the Guarantors accrued hereunder and under
the Loans, the Notes, if any, and the other Loan Documents (including, without
limitation, the payment of cash collateral to secure the LC Exposure as provided
in Section 2.08(j)), shall automatically become due and payable, without
presentment, demand, protest or other notice of any kind, all of which are
hereby waived by the Borrower and each Guarantor.

          (b) In the case of the occurrence of an Event of Default, the
Administrative Agent and the Lenders will have all other rights and remedies
available at law and equity.

          (c) All proceeds realized from the liquidation or other disposition of
collateral or otherwise received after maturity of the Loans, whether by
acceleration or otherwise, shall be applied: first, to reimbursement of expenses
and indemnities provided for in this Agreement and the Security Instruments;
second, to accrued interest on the Loans; third, to fees; fourth, pro rata to
principal outstanding on the Loans and Indebtedness referred to in clause (b) of
the definition of "Indebtedness" owing to a Lender or an Affiliate of a Lender;
fifth, to any other Indebtedness; sixth, to serve as cash collateral to be held
by the Administrative Agent to secure the LC Exposure; and any excess shall be
paid to the Borrower or as otherwise required by any Governmental Requirement.


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                                   ARTICLE XI
                                   THE AGENTS

          (a) Appointment; Powers. Each of the Lenders and the Issuing Bank
hereby irrevocably appoints the Administrative Agent as its agent and authorizes
the Administrative Agent to take such actions on its behalf and to exercise such
powers as are delegated to the Administrative Agent by the terms hereof and the
other Loan Documents, together with such actions and powers as are reasonably
incidental thereto.

     Section 11.02 Duties and Obligations of Administrative Agent. The
Administrative Agent shall not have any duties or obligations except those
expressly set forth in the Loan Documents. Without limiting the generality of
the foregoing, (a) the Administrative Agent shall not be subject to any
fiduciary or other implied duties, regardless of whether a Default has occurred
and is continuing, (b) the Administrative Agent shall not have any duty to take
any discretionary action or exercise any discretionary powers, except as
provided in Section 11.03, and (c) except as expressly set forth herein, the
Administrative Agent shall not have any duty to disclose, and shall not be
liable for the failure to disclose, any information relating to the Borrower or
any of its Subsidiaries that is communicated to or obtained by the bank serving
as Administrative Agent or any of its Affiliates in any capacity. The
Administrative Agent shall be deemed not to have knowledge of any Default unless
and until written notice thereof is given to the Administrative Agent by the
Borrower or a Lender, and shall not be responsible for or have any duty to
ascertain or inquire into (i) any statement, warranty or representation made in
or in connection with this Agreement or any other Loan Document, (ii) the
contents of any certificate, report or other document delivered hereunder or
under any other Loan Document or in connection herewith or therewith, (iii) the
performance or observance of any of the covenants, agreements or other terms or
conditions set forth herein or in any other Loan Document, (iv) the validity,
enforceability, effectiveness or genuineness of this Agreement, any other Loan
Document or any other agreement, instrument or document, (v) the satisfaction of
any condition set forth in ARTICLE VI or elsewhere herein, other than to confirm
receipt of items expressly required to be delivered to the Administrative Agent
or as to those conditions precedent expressly required to be to the
Administrative Agent's satisfaction, (vi) the existence, value, perfection or
priority of any collateral security or the financial or other condition of the
Borrower and its Subsidiaries or any other obligor or guarantor, or (vii) any
failure by the Borrower or any other Person (other than itself) to perform any
of its obligations hereunder or under any other Loan Document or the performance
or observance of any covenants, agreements or other terms or conditions set
forth herein or therein.

     Section 11.03 Action by Administrative Agent. The Administrative Agent
shall not have any duty to take any discretionary action or exercise any
discretionary powers, except discretionary rights and powers expressly
contemplated hereby that the Administrative Agent is required to exercise in
writing as directed by the Majority Lenders (or such other number or percentage
of the Lenders as shall be necessary under the circumstances as provided in
Section 12.02) and in all cases the Administrative Agent shall be fully
justified in failing or refusing to act hereunder or under any other Loan
Documents unless it shall (a) receive written instructions from the Majority
Lenders or the Lenders, as applicable, (or such other number or percentage of
the Lenders as shall be necessary under the circumstances as provided in Section
12.02) specifying the action to be taken and (b) be indemnified to its
satisfaction by the Lenders against


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any and all liability and expenses which may be incurred by it by reason of
taking or continuing to take any such action. The instructions as aforesaid and
any action taken or failure to act pursuant thereto by the Administrative Agent
shall be binding on all of the Lenders. If a Default has occurred and is
continuing, then the Administrative Agent shall take such action with respect to
such Default as shall be directed by the requisite Lenders in the written
instructions (with indemnities) described in this Section 11.03, provided that,
unless and until the Administrative Agent shall have received such directions,
the Administrative Agent may (but shall not be obligated to) take such action,
or refrain from taking such action, with respect to such Default as it shall
deem advisable in the best interests of the Lenders. In no event, however, shall
the Administrative Agent be required to take any action which exposes the
Administrative Agent to personal liability or which is contrary to this
Agreement, the Loan Documents or applicable law. If a Default has occurred and
is continuing, neither the Syndication Agent nor any Co-Documentation Agent
shall have any obligation to perform any act in respect thereof. No Agent shall
be liable for any action taken or not taken by it with the consent or at the
request of the Majority Lenders or the Lenders (or such other number or
percentage of the Lenders as shall be necessary under the circumstances as
provided in Section 12.02), and otherwise no Agent shall be liable for any
action taken or not taken by it hereunder or under any other Loan Document or
under any other document or instrument referred to or provided for herein or
therein or in connection herewith or therewith INCLUDING ITS OWN ORDINARY
NEGLIGENCE, except for its own gross negligence or willful misconduct.

     Section 11.04 Reliance by Administrative Agent. The Administrative Agent
shall be entitled to rely upon, and shall not incur any liability for relying
upon, any notice, request, certificate, consent, statement, instrument, document
or other writing believed by it to be genuine and to have been signed or sent by
the proper Person. The Administrative Agent also may rely upon any statement
made to it orally or by telephone and believed by it to be made by the proper
Person, and shall not incur any liability for relying thereon and each of the
Borrower, the Lenders and the Issuing Bank hereby waives the right to dispute
the Administrative Agent's record of such statement, except in the case of gross
negligence or willful misconduct by the Administrative Agent. The Administrative
Agent may consult with legal counsel (who may be counsel for the Borrower),
independent accountants and other experts selected by it, and shall not be
liable for any action taken or not taken by it in accordance with the advice of
any such counsel, accountants or experts. The Agents may deem and treat the
payee of the Note, if any, as the holder thereof for all purposes hereof unless
and until a written notice of the assignment or transfer thereof permitted
hereunder shall have been filed with the Administrative Agent.

     Section 11.05 Subagents. The Administrative Agent may perform any and all
its duties and exercise its rights and powers by or through any one or more
sub-agents appointed by the Administrative Agent. The Administrative Agent and
any such sub-agent may perform any and all its duties and exercise its rights
and powers through their respective Related Parties. The exculpatory provisions
of the preceding Sections of this ARTICLE XI shall apply to any such sub-agent
and to the Related Parties of the Administrative Agent and any such sub-agent,
and shall apply to their respective activities in connection with the
syndication of the credit facilities provided for herein as well as activities
as Administrative Agent.

     Section 11.06 Resignation or Removal of Agents. Subject to the appointment
and acceptance of a successor Agent as provided in this Section 11.06, any Agent
may resign at any


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time by notifying the Lenders, the Issuing Bank and the Borrower, and any Agent
may be removed at any time with or without cause by the Majority Lenders. Upon
any such resignation or removal, the Majority Lenders shall have the right, with
the consent of the Borrower, which consent shall not be unreasonably withheld or
delayed, to appoint a successor. If no successor shall have been so appointed
and shall have accepted such appointment within 30 days after the retiring Agent
gives notice of its resignation or removal of the retiring Agent, then the
retiring Agent may, on behalf of the Lenders and the Issuing Bank, appoint a
successor Agent, or an Affiliate of any such bank. Upon the acceptance of its
appointment as Agent hereunder by a successor, such successor shall succeed to
and become vested with all the rights, powers, privileges and duties of the
retiring Agent, and the retiring Agent shall be discharged from its duties and
obligations hereunder. The fees payable by the Borrower to a successor Agent
shall be the same as those payable to its predecessor unless otherwise agreed
between the Borrower and such successor. After the Agent's resignation
hereunder, the provisions of this ARTICLE XI and Section 12.03 shall continue in
effect for the benefit of such retiring Agent, its sub-agents and their
respective Related Parties in respect of any actions taken or omitted to be
taken by any of them while it was acting as Agent.

     Section 11.07 Agents as Lenders. Each bank serving as an Agent hereunder
shall have the same rights and powers in its capacity as a Lender as any other
Lender and may exercise the same as though it were not an Agent, and such bank
and its Affiliates may accept deposits from, lend money to and generally engage
in any kind of business with the Borrower or any Subsidiary or other Affiliate
thereof as if it were not an Agent hereunder.

     Section 11.08 No Reliance. Each Lender acknowledges that it has,
independently and without reliance upon the Administrative Agent, any other
Agent or any other Lender and based on such documents and information as it has
deemed appropriate, made its own credit analysis and decision to enter into this
Agreement and each other Loan Document to which it is a party. Each Lender also
acknowledges that it will, independently and without reliance upon the
Administrative Agent, any other Agent or any other Lender and based on such
documents and information as it shall from time to time deem appropriate,
continue to make its own decisions in taking or not taking action under or based
upon this Agreement, any other Loan Document, any related agreement or any
document furnished hereunder or thereunder. The Agents shall not be required to
keep themselves informed as to the performance or observance by the Borrower or
any of its Subsidiaries of this Agreement, the Loan Documents or any other
document referred to or provided for herein or to inspect the Properties or
books of the Borrower or its Subsidiaries. Except for notices, reports and other
documents and information expressly required to be furnished to the Lenders by
the Administrative Agent hereunder, no Agent or the Arranger shall have any duty
or responsibility to provide any Lender with any credit or other information
concerning the affairs, financial condition or business of the Borrower (or any
of its Affiliates) which may come into the possession of such Agent or any of
its Affiliates. In this regard, each Lender acknowledges that Vinson & Elkins
L.L.P. is acting in this transaction as special counsel to the Administrative
Agent only, except to the extent otherwise expressly stated in any legal opinion
or any Loan Document. Each other party hereto will consult with its own legal
counsel to the extent that it deems necessary in connection with the Loan
Documents and the matters contemplated therein.


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     Section 11.09 Authority of Administrative Agent to Release Collateral and
Liens. Each Lender and the Issuing Bank hereby authorizes the Administrative
Agent to release any collateral that is permitted to be sold or released
pursuant to the terms of the Loan Documents. Each Lender and the Issuing Bank
hereby authorizes the Administrative Agent to execute and deliver to the
Borrower, at the Borrower's sole cost and expense, any and all releases of
Liens, termination statements, assignments or other documents reasonably
requested by the Borrower in connection with any sale or other disposition of
Property to the extent such sale or other disposition is permitted by the terms
of Section 9.13 or is otherwise authorized by the terms of the Loan Documents.

     Section 11.10 The Arranger, the Syndication Agent and the Co-Documentation
Agents. The Arranger, the Syndication Agent and the Co-Documentation Agents
shall have no duties, responsibilities or liabilities under this Agreement and
the other Loan Documents other than their duties, responsibilities and
liabilities in their capacity as Lenders hereunder.

                                   ARTICLE XII
                                  MISCELLANEOUS

     Section 12.01 Notices.

          (a) Except in the case of notices and other communications expressly
permitted to be given by telephone (and subject to Section 12.01(b)), all
notices and other communications provided for herein shall be in writing and
shall be delivered by hand or overnight courier service, mailed by certified or
registered mail or sent by telecopy, as follows:

               (i) if to the Borrower, to it at 1100 Louisiana, Suite 4400,
Houston, Texas 77002, Attention: Shane Bayless (Telecopy No. (832) 204-2827);
with a copy to Hinkle Elkouri Law Firm, L.L.C., 301 North Main, Suite 2000,
Wichita, Kansas 67202, Attention: David S. Elkouri (Telecopy No. (316)
660-6011);

               (ii) if to the Administrative Agent, to it at 919 Third Avenue,
New York, New York 10022, Attention: Millie Carillo, Loan Assistant (Telecopy
No. (212) 841-2683), with a copy to 1200 Smith Street, Suite 3100, Houston,
Texas 77002, Attention: Brian Malone (Telecopy No. (713) 659-6915;

               (iii) if to the Issuing Bank, to it at 919 Third Avenue, New
York, New York 10022, Attention: Millie Carillo, Loan Assistant (Telecopy No.
(212) 841-2683), with a copy to 1200 Smith Street, Suite 3100, Houston, Texas
77002, Attention: Brian Malone (Telecopy No. (713) 659-6915); and

               (iv) if to any other Lender, to it at its address (or telecopy
number) set forth in its Administrative Questionnaire.

          (b) Notices and other communications to the Lenders hereunder may be
delivered or furnished by electronic communications pursuant to procedures
approved by the Administrative Agent; provided that the foregoing shall not
apply to notices pursuant to ARTICLE II, ARTICLE III, ARTICLE IV and ARTICLE V
unless otherwise agreed by the Administrative Agent and the applicable Lender.
The Administrative Agent or the Borrower


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may, in its discretion, agree to accept notices and other communications to it
hereunder by electronic communications pursuant to procedures approved by it;
provided that approval of such procedures may be limited to particular notices
or communications.

          (c) Any party hereto may change its address or telecopy number for
notices and other communications hereunder by notice to the other parties
hereto. All notices and other communications given to any party hereto in
accordance with the provisions of this Agreement shall be deemed to have been
given on the date of receipt.

     Section 12.02 Waivers; Amendments.

          (a) No failure on the part of the Administrative Agent, the Issuing
Bank or any Lender to exercise and no delay in exercising, and no course of
dealing with respect to, any right, power or privilege, or any abandonment or
discontinuance of steps to enforce such right, power or privilege, under any of
the Loan Documents shall operate as a waiver thereof, nor shall any single or
partial exercise of any right, power or privilege under any of the Loan
Documents preclude any other or further exercise thereof or the exercise of any
other right, power or privilege. The rights and remedies of the Administrative
Agent, the Issuing Bank and the Lenders hereunder and under the other Loan
Documents are cumulative and are not exclusive of any rights or remedies that
they would otherwise have. No waiver of any provision of this Agreement or any
other Loan Document or consent to any departure by the Borrower therefrom shall
in any event be effective unless the same shall be permitted by Section
12.02(b), and then such waiver or consent shall be effective only in the
specific instance and for the purpose for which given. Without limiting the
generality of the foregoing, the making of a Loan or issuance of a Letter of
Credit shall not be construed as a waiver of any Default, regardless of whether
the Administrative Agent, any Lender or the Issuing Bank may have had notice or
knowledge of such Default at the time.

          (b) Neither this Agreement nor any provision hereof nor any Security
Instrument nor any provision thereof may be waived, amended or modified except
pursuant to an agreement or agreements in writing entered into by the Borrower
and the Majority Lenders or by the Borrower and the Administrative Agent with
the consent of the Majority Lenders; provided that no such agreement shall (i)
increase the Commitment or the Maximum Credit Amount of any Lender without the
written consent of such Lender, (ii) increase the Borrowing Base without the
written consent of the Required Lenders, decrease or maintain the Borrowing Base
without the consent of the Majority Lenders, or modify Section 2.07 without the
consent of each Lender, (iii) reduce the principal amount of the Loan or LC
Disbursement or reduce the rate of interest thereon, or reduce any fees payable
hereunder, or reduce any other Indebtedness hereunder or under any other Loan
Document, without the written consent of each Lender affected thereby, (iv)
postpone the scheduled date of payment or prepayment of the principal amount of
the Loan or LC Disbursement, or any interest thereon, or any fees payable
hereunder, or any other Indebtedness hereunder or under any other Loan Document,
or reduce the amount of, waive or excuse any such payment, or postpone or extend
the Termination Date without the written consent of each Lender affected
thereby, (v) change Section 4.01(b) or Section 4.01(c) in a manner that would
alter the pro rata sharing of payments required thereby, without the written
consent of each Lender, (vi) waive or amend Section 3.04(c), Section 6.01,
Section 8.14, Section 10.02(c) or Section 12.15 or change the definition of the
terms "Domestic Subsidiary", "Foreign


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Subsidiary", "Material Domestic Subsidiary" or "Subsidiary", without the written
consent of each Lender, (vii) release any Guarantor (except as set forth in the
Guaranty Agreement), release a substantial portion of the collateral (other than
as provided in Section 11.09), or reduce the percentage set forth in Section
8.14(a) to less than 80%, without the written consent of each Lender, (viii)
change the Applicable Percentage of a Lender holding 12.5% or more of the
Maximum Credit Amounts without the written consent of such Lender or (ix) change
any of the provisions of this Section 12.02(b) or the definitions of "Required
Lenders" or "Majority Lenders" or any other provision hereof specifying the
number or percentage of Lenders required to waive, amend or modify any rights
hereunder or under any other Loan Documents or make any determination or grant
any consent hereunder or any other Loan Documents, without the written consent
of each Lender; provided further that no such agreement shall amend, modify or
otherwise affect the rights or duties of the Administrative Agent or the Issuing
Bank hereunder or under any other Loan Document without the prior written
consent of the Administrative Agent or the Issuing Bank, as the case may be.
Notwithstanding the foregoing, any supplement to Schedule 7.15 (Subsidiaries)
shall be effective simply by delivering to the Administrative Agent a
supplemental schedule clearly marked as such and, upon receipt, the
Administrative Agent will promptly deliver a copy thereof to the Lenders.

     Section 12.03 Expenses, Indemnity; Damage Waiver.

          (a) The Borrower shall pay (i) all reasonable out-of-pocket expenses
incurred by the Administrative Agent and its Affiliates, including, without
limitation, the reasonable fees, charges and disbursements of counsel and other
outside consultants for the Administrative Agent, the reasonable travel,
photocopy, mailing, courier, telephone and other similar expenses, including all
Intralinks expenses, and the cost of environmental audits and surveys and
appraisals, in connection with the syndication of the credit facilities provided
for herein, the preparation, negotiation, execution, delivery and administration
(both before and after the execution hereof and including advice of counsel to
the Administrative Agent as to the rights and duties of the Administrative Agent
and the Lenders with respect thereto) of this Agreement and the other Loan
Documents and any amendments, modifications or waivers of or consents related to
the provisions hereof or thereof (whether or not the transactions contemplated
hereby or thereby shall be consummated), (ii) all costs, expenses, Taxes,
assessments and other charges incurred by any Agent or any Lender in connection
with any filing, registration, recording or perfection of any security interest
contemplated by this Agreement or any Security Instrument or any other document
referred to therein, (iii) all reasonable out-of-pocket expenses incurred by the
Issuing Bank in connection with the issuance, amendment, renewal or extension of
any Letter of Credit or any demand for payment thereunder, (iv) all
out-of-pocket expenses incurred by any Agent, the Issuing Bank or any Lender,
including the fees, charges and disbursements of any counsel for any Agent, the
Issuing Bank or any Lender, in connection with the enforcement or protection of
its rights in connection with this Agreement or any other Loan Document,
including its rights under this Section 12.03, or in connection with the Loans
made or Letters of Credit issued hereunder, including, without limitation, all
such out-of-pocket expenses incurred during any workout, restructuring or
negotiations in respect of such Loans or Letters of Credit.

          (b) THE BORROWER SHALL INDEMNIFY EACH AGENT, THE ISSUING BANK, THE
ARRANGER AND EACH LENDER, AND EACH RELATED PARTY OF ANY OF THE FOREGOING PERSONS
(EACH SUCH PERSON BEING CALLED AN


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"INDEMNITEE") AGAINST, AND HOLD EACH INDEMNITEE HARMLESS FROM, ANY AND ALL
LOSSES, CLAIMS, DAMAGES, LIABILITIES AND RELATED EXPENSES, INCLUDING THE FEES,
CHARGES AND DISBURSEMENTS OF ANY COUNSEL FOR ANY INDEMNITEE, INCURRED BY OR
ASSERTED AGAINST ANY INDEMNITEE ARISING OUT OF, IN CONNECTION WITH, OR AS A
RESULT OF (i) THE EXECUTION OR DELIVERY OF THIS AGREEMENT OR ANY OTHER LOAN
DOCUMENT OR ANY AGREEMENT OR INSTRUMENT CONTEMPLATED HEREBY OR THEREBY, THE
PERFORMANCE BY THE PARTIES HERETO OR THE PARTIES TO ANY OTHER LOAN DOCUMENT OF
THEIR RESPECTIVE OBLIGATIONS HEREUNDER OR THEREUNDER OR THE CONSUMMATION OF THE
TRANSACTIONS CONTEMPLATED HEREBY OR BY ANY OTHER LOAN DOCUMENT, (ii) THE FAILURE
OF THE BORROWER OR ANY RESTRICTED SUBSIDIARY TO COMPLY WITH THE TERMS OF ANY
LOAN DOCUMENT, INCLUDING THIS AGREEMENT, OR WITH ANY GOVERNMENTAL REQUIREMENT,
(iii) ANY INACCURACY OF ANY REPRESENTATION OR ANY BREACH OF ANY WARRANTY OR
COVENANT OF THE BORROWER OR ANY GUARANTOR SET FORTH IN ANY OF THE LOAN DOCUMENTS
OR ANY INSTRUMENTS, DOCUMENTS OR CERTIFICATIONS DELIVERED IN CONNECTION
THEREWITH, (iv) ANY LOAN OR LETTER OF CREDIT OR THE USE OF THE PROCEEDS
THEREFROM, INCLUDING, WITHOUT LIMITATION, (A) ANY REFUSAL BY THE ISSUING BANK TO
HONOR A DEMAND FOR PAYMENT UNDER A LETTER OF CREDIT IF THE DOCUMENTS PRESENTED
IN CONNECTION WITH SUCH DEMAND DO NOT STRICTLY COMPLY WITH THE TERMS OF SUCH
LETTER OF CREDIT, OR (B) THE PAYMENT OF A DRAWING UNDER ANY LETTER OF CREDIT
NOTWITHSTANDING THE NON-COMPLIANCE, NON-DELIVERY OR OTHER IMPROPER PRESENTATION
OF THE DOCUMENTS PRESENTED IN CONNECTION THEREWITH, (v) ANY OTHER ASPECT OF THE
LOAN DOCUMENTS, (vi) THE OPERATIONS OF THE BUSINESS OF THE BORROWER AND ITS
SUBSIDIARIES BY THE BORROWER AND ITS SUBSIDIARIES, (vii) ANY ASSERTION THAT THE
LENDERS WERE NOT ENTITLED TO RECEIVE THE PROCEEDS RECEIVED PURSUANT TO THE
SECURITY INSTRUMENTS, (viii) ANY ENVIRONMENTAL LAW APPLICABLE TO THE BORROWER OR
ANY SUBSIDIARY OR ANY OF THEIR PROPERTIES, INCLUDING WITHOUT LIMITATION, THE
PRESENCE, GENERATION, STORAGE, RELEASE, THREATENED RELEASE, USE, TRANSPORT,
DISPOSAL, ARRANGEMENT OF DISPOSAL OR TREATMENT OF OIL, OIL AND GAS WASTES, SOLID
WASTES OR HAZARDOUS SUBSTANCES ON ANY OF THEIR PROPERTIES, (ix) THE BREACH OR
NON-COMPLIANCE BY THE BORROWER OR ANY SUBSIDIARY WITH ANY ENVIRONMENTAL LAW
APPLICABLE TO THE BORROWER OR ANY SUBSIDIARY, (x) THE PAST OWNERSHIP BY THE
BORROWER OR ANY SUBSIDIARY OF ANY OF THEIR PROPERTIES OR PAST ACTIVITY ON ANY OF
THEIR PROPERTIES WHICH, THOUGH LAWFUL AND FULLY PERMISSIBLE AT THE TIME, COULD
RESULT IN PRESENT LIABILITY, (xi) THE PRESENCE, USE, RELEASE, STORAGE,
TREATMENT, DISPOSAL, GENERATION, THREATENED RELEASE, TRANSPORT, ARRANGEMENT FOR
TRANSPORT OR ARRANGEMENT FOR DISPOSAL OF OIL, OIL AND GAS WASTES, SOLID WASTES
OR HAZARDOUS SUBSTANCES ON OR AT ANY OF THE PROPERTIES OWNED OR OPERATED BY THE
BORROWER OR ANY SUBSIDIARY OR ANY ACTUAL OR ALLEGED PRESENCE OR RELEASE OF


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HAZARDOUS MATERIALS ON OR FROM ANY PROPERTY OWNED OR OPERATED BY THE BORROWER OR
ANY OF ITS SUBSIDIARIES, (xii) ANY ENVIRONMENTAL LIABILITY RELATED IN ANY WAY TO
THE BORROWER OR ANY OF ITS SUBSIDIARIES, OR (xiii) ANY OTHER ENVIRONMENTAL,
HEALTH OR SAFETY CONDITION IN CONNECTION WITH THE LOAN DOCUMENTS, OR (xiv) ANY
ACTUAL OR PROSPECTIVE CLAIM, LITIGATION, INVESTIGATION OR PROCEEDING RELATING TO
ANY OF THE FOREGOING, WHETHER BASED ON CONTRACT, TORT OR ANY OTHER THEORY AND
REGARDLESS OF WHETHER ANY INDEMNITEE IS A PARTY THERETO, AND SUCH INDEMNITY
SHALL EXTEND TO EACH INDEMNITEE NOTWITHSTANDING THE SOLE OR CONCURRENT
NEGLIGENCE OF EVERY KIND OR CHARACTER WHATSOEVER, WHETHER ACTIVE OR PASSIVE,
WHETHER AN AFFIRMATIVE ACT OR AN OMISSION, INCLUDING WITHOUT LIMITATION, ALL
TYPES OF NEGLIGENT CONDUCT IDENTIFIED IN THE RESTATEMENT (SECOND) OF TORTS OF
ONE OR MORE OF THE INDEMNITEES OR BY REASON OF STRICT LIABILITY IMPOSED WITHOUT
FAULT ON ANY ONE OR MORE OF THE INDEMNITEES; PROVIDED THAT SUCH INDEMNITY SHALL
NOT, AS TO ANY INDEMNITEE, BE AVAILABLE TO THE EXTENT THAT SUCH LOSSES, CLAIMS,
DAMAGES, LIABILITIES OR RELATED EXPENSES ARE DETERMINED BY A COURT OF COMPETENT
JURISDICTION BY FINAL AND NONAPPEALABLE JUDGMENT TO HAVE RESULTED FROM THE GROSS
NEGLIGENCE OR WILFUL MISCONDUCT OF SUCH INDEMNITEE.

          (c) To the extent that the Borrower fails to pay any amount required
to be paid by it to any Agent or the Issuing Bank under Section 12.03(a) or (b),
each Lender severally agrees to pay to such Agent or the Issuing Bank, as the
case may be, such Lender's Applicable Percentage (determined as of the time that
the applicable unreimbursed expense or indemnity payment is sought) of such
unpaid amount; provided that the unreimbursed expense or indemnified loss,
claim, damage, liability or related expense, as the case may be, was incurred by
or asserted against such Agent or the Issuing Bank in its capacity as such.

          (d) To the extent permitted by applicable law, the Borrower shall not
assert, and hereby waives, any claim against any Indemnitee, on any theory of
liability, for special, indirect, consequential or punitive damages (as opposed
to direct or actual damages) arising out of, in connection with, or as a result
of, this Agreement, any other Loan Document or any agreement or instrument
contemplated hereby or thereby, the Transactions, any Loan or Letter of Credit
or the use of the proceeds thereof.

          (e) All amounts due under this Section 12.03 shall be payable not
later than 5 days after written demand therefor.

     Section 12.04 Successors and Assigns.

          (a) The provisions of this Agreement shall be binding upon and inure
to the benefit of the parties hereto and their respective successors and assigns
permitted hereby (including any Affiliate of the Issuing Bank that issues any
Letter of Credit), except that (i) the Borrower may not assign or otherwise
transfer any of its rights or obligations hereunder without the prior written
consent of each Lender (and any attempted assignment or transfer by the


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Borrower without such consent shall be null and void) and (ii) no Lender may
assign or otherwise transfer its rights or obligations hereunder except in
accordance with this Section 12.04. Nothing in this Agreement, expressed or
implied, shall be construed to confer upon any Person (other than the parties
hereto, their respective successors and assigns permitted hereby (including any
Affiliate of the Issuing Bank that issues any Letter of Credit), Participants
(to the extent provided in Section 12.04(c)) and, to the extent expressly
contemplated hereby, the Related Parties of each of the Administrative Agent,
the Issuing Bank and the Lenders) any legal or equitable right, remedy or claim
under or by reason of this Agreement.

          (b) (i) Subject to the conditions set forth in Section 12.04(b)(ii),
any Lender may assign to one or more assignees all or a portion of its rights
and obligations under this Agreement (including all or a portion of its
Commitment and the Loans at the time owing to it) with the prior written consent
(such consent not to be unreasonably withheld) of:

                    (A) the Borrower, provided that no consent of the Borrower
shall be required for an assignment to a Lender, an Affiliate of a Lender, an
Approved Fund or, if an Event of Default has occurred and is continuing, any
other assignee; and

                    (B) the Administrative Agent, provided that no consent of
the Administrative Agent shall be required for an assignment to an assignee that
is a Lender immediately prior to giving effect to such assignment.

               (ii) Assignments shall be subject to the following additional
conditions:

                    (A) except in the case of an assignment to a Lender or an
Affiliate of a Lender or an assignment of the entire remaining amount of the
assigning Lender's Commitment or Loans, the amount of the Commitment or Loans of
the assigning Lender subject to each such assignment (determined as of the date
the Assignment and Assumption with respect to such assignment is delivered to
the Administrative Agent) shall not be less than $5,000,000 unless each of the
Borrower and the Administrative Agent otherwise consent, provided that no such
consent of the Borrower shall be required if an Event of Default has occurred
and is continuing;

                    (B) each partial assignment shall be made as an assignment
of a proportionate part of all the assigning Lender's rights and obligations
under this Agreement;

                    (C) the parties to each assignment shall execute and deliver
to the Administrative Agent an Assignment and Assumption, together with a
processing and recordation fee of $3,500; and

                    (D) the assignee, if it shall not be a Lender, shall deliver
to the Administrative Agent an Administrative Questionnaire.

               (iii) Subject to Section 12.04(b)(iv) and the acceptance and
recording thereof, from and after the effective date specified in each
Assignment and Assumption the assignee thereunder shall be a party hereto and,
to the extent of the interest assigned by such Assignment and Assumption, have
the rights and obligations of a Lender under this Agreement,


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and the assigning Lender thereunder shall, to the extent of the interest
assigned by such Assignment and Assumption, be released from its obligations
under this Agreement (and, in the case of an Assignment and Assumption covering
all of the assigning Lender's rights and obligations under this Agreement, such
Lender shall cease to be a party hereto but shall continue to be entitled to the
benefits of Section 5.01, Section 5.02, Section 5.03 and Section 12.03). Any
assignment or transfer by a Lender of rights or obligations under this Agreement
that does not comply with this Section 12.04 shall be treated for purposes of
this Agreement as a sale by such Lender of a participation in such rights and
obligations in accordance with Section 12.04(c).

               (iv) The Administrative Agent, acting for this purpose as an
agent of the Borrower, shall maintain at one of its offices a copy of each
Assignment and Assumption delivered to it and a register for the recordation of
the names and addresses of the Lenders, and the Maximum Credit Amount of, and
principal amount of the Loans and LC Disbursements owing to, each Lender
pursuant to the terms hereof from time to time (the "Register"). The entries in
the Register shall be conclusive, and the Borrower, the Administrative Agent,
the Issuing Bank and the Lenders may treat each Person whose name is recorded in
the Register pursuant to the terms hereof as a Lender hereunder for all purposes
of this Agreement, notwithstanding notice to the contrary. The Register shall be
available for inspection by the Borrower, the Issuing Bank and any Lender, at
any reasonable time and from time to time upon reasonable prior notice. In
connection with any changes to the Register, if necessary, the Administrative
Agent will reflect the revisions on Annex I and forward a copy of such revised
Annex I to the Borrower, the Issuing Bank and each Lender.

               (v) Upon its receipt of a duly completed Assignment and
Assumption executed by an assigning Lender and an assignee, the assignee's
completed Administrative Questionnaire (unless the assignee shall already be a
Lender hereunder), the processing and recordation fee referred to in Section
12.04(b) and any written consent to such assignment required by Section
12.04(b), the Administrative Agent shall accept such Assignment and Assumption
and record the information contained therein in the Register. No assignment
shall be effective for purposes of this Agreement unless it has been recorded in
the Register as provided in this Section 12.04(b).

          (c) (i) Any Lender may, without the consent of the Borrower, the
Administrative Agent or the Issuing Bank, sell participations to one or more
banks or other entities (a "Participant") in all or a portion of such Lender's
rights and obligations under this Agreement (including all or a portion of its
Commitment and the Loans owing to it); provided that (A) such Lender's
obligations under this Agreement shall remain unchanged, (B) such Lender shall
remain solely responsible to the other parties hereto for the performance of
such obligations and (C) the Borrower, the Administrative Agent, the Issuing
Bank and the other Lenders shall continue to deal solely and directly with such
Lender in connection with such Lender's rights and obligations under this
Agreement. Any agreement or instrument pursuant to which a Lender sells such a
participation shall provide that such Lender shall retain the sole right to
enforce this Agreement and to approve any amendment, modification or waiver of
any provision of this Agreement; provided that such agreement or instrument may
provide that such Lender will not, without the consent of the Participant, agree
to any amendment, modification or waiver described in the proviso to Section
12.02 that affects such Participant. In addition such agreement must provide
that the Participant be bound by the provisions of Section 12.03.


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Subject to Section 12.04(c)(ii), the Borrower agrees that each Participant shall
be entitled to the benefits of Section 5.01, Section 5.02 and Section 5.03 to
the same extent as if it were a Lender and had acquired its interest by
assignment pursuant to Section 12.04(b). To the extent permitted by law, each
Participant also shall be entitled to the benefits of Section 12.08 as though it
were a Lender, provided such Participant agrees to be subject to Section 4.01(c)
as though it were a Lender.

          (ii) A Participant shall not be entitled to receive any greater
     payment under Section 5.01 or Section 5.03 than the applicable Lender would
     have been entitled to receive with respect to the participation sold to
     such Participant, unless the sale of the participation to such Participant
     is made with the Borrower's prior written consent. A Participant that would
     be a Foreign Lender if it were a Lender shall not be entitled to the
     benefits of Section 5.03 unless the Borrower is notified of the
     participation sold to such Participant and such Participant agrees, for the
     benefit of the Borrower, to comply with Section 5.03(e) as though it were a
     Lender.

          (d) Any Lender may at any time pledge or assign a security interest in
all or any portion of its rights under this Agreement to secure obligations of
such Lender, including, without limitation, any pledge or assignment to secure
obligations to a Federal Reserve Bank, and this Section 12.04(d) shall not apply
to any such pledge or assignment of a security interest; provided that no such
pledge or assignment of a security interest shall release a Lender from any of
its obligations hereunder or substitute any such pledgee or assignee for such
Lender as a party hereto.

          (e) Notwithstanding any other provisions of this Section 12.04, no
transfer or assignment of the interests or obligations of any Lender or any
grant of participations therein shall be permitted if such transfer, assignment
or grant would require the Borrower and the Guarantors to file a registration
statement with the SEC or to qualify the Loans under the "Blue Sky" laws of any
state.

     Section 12.05 Survival; Revival; Reinstatement.

          (a) All covenants, agreements, representations and warranties made by
the Borrower herein and in the certificates or other instruments delivered in
connection with or pursuant to this Agreement or any other Loan Document shall
be considered to have been relied upon by the other parties hereto and shall
survive the execution and delivery of this Agreement and the making of any Loans
and issuance of any Letters of Credit, regardless of any investigation made by
any such other party or on its behalf and notwithstanding that the
Administrative Agent, the Issuing Bank or any Lender may have had notice or
knowledge of any Default or incorrect representation or warranty at the time any
credit is extended hereunder, and shall continue in full force and effect as
long as the principal of or any accrued interest on any Loan or any fee or any
other amount payable under this Agreement is outstanding and unpaid or any
Letter of Credit is outstanding and so long as the Commitments have not expired
or terminated. The provisions of Section 5.01, Section 5.02, Section 5.03 and
Section 12.03 and ARTICLE XI shall survive and remain in full force and effect
regardless of the consummation of the transactions contemplated hereby, the
repayment of the Loans, the expiration or termination


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of the Letters of Credit and the Commitments or the termination of this
Agreement, any other Loan Document or any provision hereof or thereof.

          (b) To the extent that any payments on the Indebtedness or proceeds of
any collateral are subsequently invalidated, declared to be fraudulent or
preferential, set aside or required to be repaid to a trustee, debtor in
possession, receiver or other Person under any bankruptcy law, common law or
equitable cause, then to such extent, the Indebtedness so satisfied shall be
revived and continue as if such payment or proceeds had not been received and
the Administrative Agent's and the Lenders' Liens, security interests, rights,
powers and remedies under this Agreement and each Loan Document shall continue
in full force and effect. In such event, each Loan Document shall be
automatically reinstated and the Borrower shall take such action as may be
reasonably requested by the Administrative Agent and the Lenders to effect such
reinstatement.

     Section 12.06 Counterparts; Integration; Effectiveness.

          (a) This Agreement may be executed in counterparts (and by different
parties hereto on different counterparts), each of which shall constitute an
original, but all of which when taken together shall constitute a single
contract.

          (b) This Agreement, the other Loan Documents and any separate letter
agreements with respect to fees payable to the Administrative Agent constitute
the entire contract among the parties relating to the subject matter hereof and
thereof and supersede any and all previous agreements and understandings, oral
or written, relating to the subject matter hereof and thereof. THIS AGREEMENT
AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT AMONG THE PARTIES
HERETO AND THERETO AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO
UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

          (c) Except as provided in Section 6.01, this Agreement shall become
effective when it shall have been executed by the Administrative Agent and when
the Administrative Agent shall have received counterparts hereof which, when
taken together, bear the signatures of each of the other parties hereto, and
thereafter shall be binding upon and inure to the benefit of the parties hereto
and their respective successors and assigns. Delivery of an executed counterpart
of a signature page of this Agreement by telecopy shall be effective as delivery
of a manually executed counterpart of this Agreement.

     Section 12.07 Severability. Any provision of this Agreement or any other
Loan Document held to be invalid, illegal or unenforceable in any jurisdiction
shall, as to such jurisdiction, be ineffective to the extent of such invalidity,
illegality or unenforceability without affecting the validity, legality and
enforceability of the remaining provisions hereof or thereof; and the invalidity
of a particular provision in a particular jurisdiction shall not invalidate such
provision in any other jurisdiction.

     Section 12.08 Right of Setoff. If an Event of Default shall have occurred
and be continuing, each Lender and each of its Affiliates is hereby authorized
at any time and from time


                                       92

<PAGE>

to time, to the fullest extent permitted by law, to set off and apply any and
all deposits (general or special, time or demand, provisional or final) at any
time held and other obligations (of whatsoever kind, including, without
limitations obligations under Swap Agreements) at any time owing by such Lender
or Affiliate to or for the credit or the account of the Borrower or any
Restricted Subsidiary against any of and all the obligations of the Borrower or
any Restricted Subsidiary owed to such Lender now or hereafter existing under
this Agreement or any other Loan Document, irrespective of whether or not such
Lender shall have made any demand under this Agreement or any other Loan
Document and although such obligations may be unmatured. The rights of each
Lender under this Section 12.08 are in addition to other rights and remedies
(including other rights of setoff) which such Lender or its Affiliates may have.

     Section 12.09 GOVERNING LAW; JURISDICTION; CONSENT TO SERVICE OF PROCESS.

          (a) THIS AGREEMENT AND THE NOTES, IF ANY, SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF TEXAS EXCEPT TO THE
EXTENT THAT UNITED STATES FEDERAL LAW PERMITS ANY LENDER TO CONTRACT FOR,
CHARGE, RECEIVE, RESERVE OR TAKE INTEREST AT THE RATE ALLOWED BY THE LAWS OF THE
STATE WHERE SUCH LENDER IS LOCATED. CHAPTER 346 OF THE TEXAS FINANCE CODE (WHICH
REGULATES CERTAIN REVOLVING CREDIT LOAN ACCOUNTS AND REVOLVING TRI-PARTY
ACCOUNTS) SHALL NOT APPLY TO THIS AGREEMENT, THE LOANS OR THE NOTES, IF ANY.

          (b) ANY LEGAL ACTION OR PROCEEDING WITH RESPECT TO THE LOAN DOCUMENTS
SHALL BE BROUGHT IN THE COURTS OF THE STATE OF TEXAS OR OF THE UNITED STATES OF
AMERICA FOR THE SOUTHERN DISTRICT OF TEXAS, AND, BY EXECUTION AND DELIVERY OF
THIS AGREEMENT, EACH PARTY HEREBY ACCEPTS FOR ITSELF AND (TO THE EXTENT
PERMITTED BY LAW) IN RESPECT OF ITS PROPERTY, GENERALLY AND UNCONDITIONALLY, THE
JURISDICTION OF THE AFORESAID COURTS. EACH PARTY HEREBY IRREVOCABLY WAIVES ANY
OBJECTION, INCLUDING, WITHOUT LIMITATION, ANY OBJECTION TO THE LAYING OF VENUE
OR BASED ON THE GROUNDS OF FORUM NON CONVENIENS, WHICH IT MAY NOW OR HEREAFTER
HAVE TO THE BRINGING OF ANY SUCH ACTION OR PROCEEDING IN SUCH RESPECTIVE
JURISDICTIONS. THIS SUBMISSION TO JURISDICTION IS NON-EXCLUSIVE AND DOES NOT
PRECLUDE A PARTY FROM OBTAINING JURISDICTION OVER ANOTHER PARTY IN ANY COURT
OTHERWISE HAVING JURISDICTION.

          (c) EACH PARTY IRREVOCABLY CONSENTS TO THE SERVICE OF PROCESS OF ANY
OF THE AFOREMENTIONED COURTS IN ANY SUCH ACTION OR PROCEEDING BY THE MAILING OF
COPIES THEREOF BY REGISTERED OR CERTIFIED MAIL, POSTAGE PREPAID, TO IT AT THE
ADDRESS SPECIFIED IN SECTION 12.01 OR SUCH OTHER ADDRESS AS IS SPECIFIED
PURSUANT TO SECTION 12.01 (OR ITS ASSIGNMENT AND ASSUMPTION), SUCH SERVICE TO
BECOME EFFECTIVE THIRTY (30) DAYS AFTER SUCH MAILING. NOTHING HEREIN SHALL
AFFECT THE RIGHT OF A PARTY OR ANY HOLDER OF ANY NOTE TO SERVE


                                       93

<PAGE>

PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR TO COMMENCE LEGAL PROCEEDINGS OR
OTHERWISE PROCEED AGAINST ANOTHER PARTY IN ANY OTHER JURISDICTION.

          (d) EACH PARTY HEREBY (i) IRREVOCABLY AND UNCONDITIONALLY WAIVES, TO
THE FULLEST EXTENT PERMITTED BY LAW, TRIAL BY JURY IN ANY LEGAL ACTION OR
PROCEEDING RELATING TO THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT AND FOR ANY
COUNTERCLAIM THEREIN; (ii) IRREVOCABLY WAIVES, TO THE MAXIMUM EXTENT NOT
PROHIBITED BY LAW, ANY RIGHT IT MAY HAVE TO CLAIM OR RECOVER IN ANY SUCH
LITIGATION ANY SPECIAL, EXEMPLARY, PUNITIVE OR CONSEQUENTIAL DAMAGES, OR DAMAGES
OTHER THAN, OR IN ADDITION TO, ACTUAL DAMAGES; (iii) CERTIFIES THAT NO PARTY
HERETO NOR ANY REPRESENTATIVE OR AGENT OF COUNSEL FOR ANY PARTY HERETO HAS
REPRESENTED, EXPRESSLY OR OTHERWISE, OR IMPLIED THAT SUCH PARTY WOULD NOT, IN
THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVERS, AND (iv)
ACKNOWLEDGES THAT IT HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT, THE LOAN
DOCUMENTS AND THE TRANSACTIONS CONTEMPLATED HEREBY AND THEREBY BY, AMONG OTHER
THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS CONTAINED IN THIS SECTION 12.09.

     Section 12.10 Headings. Article and Section headings and the Table of
Contents used herein are for convenience of reference only, are not part of this
Agreement and shall not affect the construction of, or be taken into
consideration in interpreting, this Agreement.

     Section 12.11 Confidentiality. Each of the Administrative Agent, the
Issuing Bank and the Lenders agrees to maintain the confidentiality of the
Information (as defined below), except that Information may be disclosed (a) to
its and its Affiliates' directors, officers, employees and agents, including
accountants, legal counsel and other advisors (it being understood that the
Persons to whom such disclosure is made will be informed of the confidential
nature of such Information and instructed to keep such Information
confidential), (b) to the extent requested by any regulatory authority, (c) to
the extent required by applicable laws or regulations or by any subpoena or
similar legal process, (d) to any other party to this Agreement or any other
Loan Document, (e) in connection with the exercise of any remedies hereunder or
under any other Loan Document or any suit, action or proceeding relating to this
Agreement or any other Loan Document or the enforcement of rights hereunder or
thereunder, (f) subject to an agreement containing provisions substantially the
same as those of this Section 12.11, to (i) any assignee of or Participant in,
or any prospective assignee of or Participant in, any of its rights or
obligations under this Agreement or (ii) any actual or prospective counterparty
(or its advisors) to any Swap Agreement relating to the Borrower and its
obligations, (g) with the consent of the Borrower or (h) to the extent such
Information (i) becomes publicly available other than as a result of a breach of
this Section 12.11 or (ii) becomes available to the Administrative Agent, the
Issuing Bank or any Lender on a nonconfidential basis from a source other than
the Borrower. For the purposes of this Section 12.11, "Information" means all
information received from the Borrower or any Restricted Subsidiary relating to
the Borrower or any Restricted Subsidiary and their businesses, other than any
such information that is available to the Administrative Agent, the Issuing Bank
or any Lender on a nonconfidential basis prior to disclosure by the Borrower or
a


                                       94

<PAGE>

Restricted Subsidiary; provided that, in the case of information received from
the Borrower or any Restricted Subsidiary after the date hereof, such
information is clearly identified at the time of delivery as confidential. Any
Person required to maintain the confidentiality of Information as provided in
this Section 12.11 shall be considered to have complied with its obligation to
do so if such Person has exercised the same degree of care to maintain the
confidentiality of such Information as such Person would accord to its own
confidential information.

     Section 12.12 Interest Rate Limitation. It is the intention of the parties
hereto that each Lender shall conform strictly to usury laws applicable to it.
Accordingly, if the transactions contemplated hereby would be usurious as to any
Lender under laws applicable to it (including the laws of the United States of
America and the State of Texas or any other jurisdiction whose laws may be
mandatorily applicable to such Lender notwithstanding the other provisions of
this Agreement), then, in that event, notwithstanding anything to the contrary
in any of the Loan Documents or any agreement entered into in connection with or
as security for the Loans, it is agreed as follows: (i) the aggregate of all
consideration which constitutes interest under law applicable to any Lender that
is contracted for, taken, reserved, charged or received by such Lender under any
of the Loan Documents or agreements or otherwise in connection with the Loans
shall under no circumstances exceed the maximum amount allowed by such
applicable law, and any excess shall be canceled automatically and if
theretofore paid shall be credited by such Lender on the principal amount of the
Indebtedness (or, to the extent that the principal amount of the Indebtedness
shall have been or would thereby be paid in full, refunded by such Lender to the
Borrower); and (ii) in the event that the maturity of the Loans is accelerated
by reason of an election of the holder thereof resulting from any Event of
Default under this Agreement or otherwise, or in the event of any required or
permitted prepayment, then such consideration that constitutes interest under
law applicable to any Lender may never include more than the maximum amount
allowed by such applicable law, and excess interest, if any, provided for in
this Agreement or otherwise shall be canceled automatically by such Lender as of
the date of such acceleration or prepayment and, if theretofore paid, shall be
credited by such Lender on the principal amount of the Indebtedness (or, to the
extent that the principal amount of the Indebtedness shall have been or would
thereby be paid in full, refunded by such Lender to the Borrower). All sums paid
or agreed to be paid to any Lender for the use, forbearance or detention of sums
due hereunder shall, to the extent permitted by law applicable to such Lender,
be amortized, prorated, allocated and spread throughout the stated term of the
Loans, until payment in full so that the rate or amount of interest on account
of any Loans hereunder does not exceed the maximum amount allowed by such
applicable law. If at any time and from time to time (i) the amount of interest
payable to any Lender on any date shall be computed at the Highest Lawful Rate
applicable to such Lender pursuant to this Section 12.12 and (ii) in respect of
any subsequent interest computation period the amount of interest otherwise
payable to such Lender would be less than the amount of interest payable to such
Lender computed at the Highest Lawful Rate applicable to such Lender, then the
amount of interest payable to such Lender in respect of such subsequent interest
computation period shall continue to be computed at the Highest Lawful Rate
applicable to such Lender until the total amount of interest payable to such
Lender shall equal the total amount of interest which would have been payable to
such Lender if the total amount of interest had been computed without giving
effect to this Section 12.12. To the extent that Chapter 303 of the Texas
Finance Code is relevant for the purpose of determining the Highest Lawful Rate
applicable to a Lender, such Lender elects to determine the


                                       95

<PAGE>

applicable rate ceiling under such Chapter by the weekly ceiling from time to
time in effect. Chapter 346 of the Texas Finance Code does not apply to the
Borrower's obligations hereunder.

     Section 12.13 EXCULPATION PROVISIONS. EACH OF THE PARTIES HERETO
SPECIFICALLY AGREES THAT IT HAS A DUTY TO READ THIS AGREEMENT AND THE OTHER LOAN
DOCUMENTS AND AGREES THAT IT IS CHARGED WITH NOTICE AND KNOWLEDGE OF THE TERMS
OF THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS; THAT IT HAS IN FACT READ THIS
AGREEMENT AND IS FULLY INFORMED AND HAS FULL NOTICE AND KNOWLEDGE OF THE TERMS,
CONDITIONS AND EFFECTS OF THIS AGREEMENT; THAT IT HAS BEEN REPRESENTED BY
INDEPENDENT LEGAL COUNSEL OF ITS CHOICE THROUGHOUT THE NEGOTIATIONS PRECEDING
ITS EXECUTION OF THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS; AND HAS RECEIVED
THE ADVICE OF ITS ATTORNEY IN ENTERING INTO THIS AGREEMENT AND THE OTHER LOAN
DOCUMENTS; AND THAT IT RECOGNIZES THAT CERTAIN OF THE TERMS OF THIS AGREEMENT
AND THE OTHER LOAN DOCUMENTS RESULT IN ONE PARTY ASSUMING THE LIABILITY INHERENT
IN SOME ASPECTS OF THE TRANSACTION AND RELIEVING THE OTHER PARTY OF ITS
RESPONSIBILITY FOR SUCH LIABILITY. EACH PARTY HERETO AGREES AND COVENANTS THAT
IT WILL NOT CONTEST THE VALIDITY OR ENFORCEABILITY OF ANY EXCULPATORY PROVISION
OF THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS ON THE BASIS THAT THE PARTY HAD
NO NOTICE OR KNOWLEDGE OF SUCH PROVISION OR THAT THE PROVISION IS NOT
"CONSPICUOUS."

     Section 12.14 Specified Senior Indebtedness. The Parties acknowledge and
agree that the Indebtedness hereunder is specifically designated "Specified
Senior Indebtedness" the Second Lien Term Loan Documents.

     Section 12.15 Collateral Matters; Swap Agreements. The benefit of the
Security Instruments and of the provisions of this Agreement relating to any
collateral securing the Indebtedness shall also extend to and be available to
those Lenders or their Affiliates which are counterparties to any Swap Agreement
with the Borrower or any of its Subsidiaries on a pro rata basis in respect of
any obligations of the Borrower or any of its Subsidiaries which arise under any
such Swap Agreement entered into while such Person or its Affiliate is a Lender,
including any Swap Agreements between such Persons in existence prior to the
date hereof. No Lender or any Affiliate of a Lender shall have any voting rights
under any Loan Document as a result of the existence of obligations owed to it
under any such Swap Agreements.

     Section 12.16 No Third Party Beneficiaries. This Agreement, the other Loan
Documents, and the agreement of the Lenders to make Loans and the Issuing Bank
to issue, amend, renew or extend Letters of Credit hereunder are solely for the
benefit of the Borrower, and no other Person (including, without limitation, any
Subsidiary of the Borrower, any obligor, contractor, subcontractor, supplier or
materialsman) shall have any rights, claims, remedies or privileges hereunder or
under any other Loan Document against the Administrative Agent, any other Agent,
the Issuing Bank or any Lender for any reason whatsoever. There are no third
party beneficiaries.


                                       96

<PAGE>

     Section 12.17 USA Patriot Act Notice. Each Lender hereby notifies the
Borrower that pursuant to the requirements of the USA Patriot Act (Title III of
Pub. L. 107-56 (signed into law October 26, 2001)) (the "Act"), it is required
to obtain, verify and record information that identifies the Borrower, which
information includes the name and address of the Borrower and other information
that will allow such Lender to identify the Borrower in accordance with the Act.

                           SIGNATURES BEGIN NEXT PAGE


                                       97

<PAGE>

     The parties hereto have caused this Agreement to be duly executed as of the
day and year first above written.

BORROWER:                               PETROHAWK ENERGY CORPORATION


                                        By:
                                            ------------------------------------
                                            Floyd C. Wilson
                                            President and
                                            Chief Executive Officer


                        [Signature Page-Credit Agreement]
                                       1

<PAGE>

ADMINISTRATIVE AGENT:                   BNP PARIBAS,
                                        as Administrative Agent


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       2
<PAGE>

SYNDICATION AGENT:                      BANK OF AMERICA, N.A., as Syndication
                                        Agent


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       3

<PAGE>

CO-DOCUMENTATION AGENT:                 JPMORGAN CHASE BANK, N.A., as Co-
                                        Documentation Agent


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       4

<PAGE>

CO-DOCUMENTATION AGENT:                 WELLS FARGO BANK, N.A., as
                                        Co-Documentation Agent


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       5

<PAGE>

LENDERS:                                BNP PARIBAS


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       6

<PAGE>

LENDERS:                                BANK OF AMERICA, N.A.


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       7

<PAGE>

LENDERS:                                JPMORGAN CHASE BANK, N.A.


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       8

<PAGE>

LENDERS:                                WELLS FARGO BANK, N.A.


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       9

<PAGE>

LENDERS:                                HARRIS NESBITT FINANCING, INC.


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       10

<PAGE>

LENDERS:                                KEYBANK, NATIONAL ASSOCIATION


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       11

<PAGE>

LENDERS:                                ALLIED IRISH BANKS P.L.C.


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       12

<PAGE>

LENDERS:                                AMEGY BANK NATIONAL ASSOCIATION


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       13

<PAGE>

LENDERS:                                FORTIS CAPITAL CORP.


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       14

<PAGE>

LENDERS:                                SUNTRUST BANK


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       15

<PAGE>

LENDERS:                                BANK OF TEXAS, N.A.


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       16

<PAGE>

LENDERS:                                U.S. BANK NATIONAL ASSOCIATION


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       17

<PAGE>

LENDERS:                                COMERICA BANK


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       18

<PAGE>

LENDERS:                                COMPASS BANK


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       19

<PAGE>

LENDERS:                                DEUTSCHE BANK TRUST COMPANY AMERICAS


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       20

<PAGE>

LENDERS:                                MACQUARIE BANK LIMITED


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       21

<PAGE>

LENDERS:                                STERLING BANK


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                        [Signature Page-Credit Agreement]
                                       22

<PAGE>

                                     ANNEX I
                         LIST OF MAXIMUM CREDIT AMOUNTS

AGGREGATE MAXIMUM CREDIT AMOUNTS

<TABLE>
<CAPTION>
           NAME OF LENDER              APPLICABLE PERCENTAGE   MAXIMUM CREDIT AMOUNT
           --------------              ---------------------   ---------------------
<S>                                    <C>                     <C>
BNP Paribas                                   010.70%             $ 42,857,142.86
Bank of America, N.A.                         008.90%             $ 35,714,285.71
JPMorgan Chase Bank, N.A.                     008.90%             $ 35,714,285.71
Wells Fargo Bank, N.A.                        008.90%             $ 35,714,285.71
Harris Nesbitt Financing, Inc.                007.10%             $ 28,571,428.57
KeyBank, National Association                 007.10%             $ 28,571,428.57
US Bank National Association                  003.60%             $ 21,428,571.43
Allied Irish Bank                             005.40%             $ 21,428,571.43
Amegy Bank of Texas, N.A.                     005.40%             $ 21,428,571.43
Fortis Capital Corp.                          005.40%             $ 21,428,571.43
SunTrust Bank                                 005.40%             $ 21,428,571.43
Bank of Texas, N.A.                           003.60%             $ 14,285,714.29
Comerica Bank                                 003.60%             $ 14,285,714.29
Compass Bank                                  003.60%             $ 14,285,714.29
Deutsche Bank Trust Company Americas          003.60%             $ 14,285,714.29
Macquarie Bank Limited                        003.60%             $ 14,285,714.29
Sterling Bank                                 003.60%             $ 14,285,714.29
TOTAL                                         100.00%             $400,000,000.00
</TABLE>


                                    Anex I-1