Exhibit 10.31
SECOND AMENDMENT TO COMBINED CREDIT AGREEMENTS
          THIS SECOND AMENDMENT TO COMBINED CREDIT AGREEMENTS, dated as of
May 8, 2008 (this “Amendment”), is entered into by and among QUICKSILVER
RESOURCES INC., a Delaware corporation (the “U.S. Borrower”), QUICKSILVER
RESOURCES CANADA INC., an Alberta, Canada corporation (the “Canadian Borrower”),
each of the Lenders (as defined in the U.S. Credit Agreement (as hereinafter
defined)) party hereto (together with its successors and assigns, the “U.S.
Lenders”), each of the Lenders (as defined in the Canadian Credit Agreement (as
hereinafter defined)) party hereto (together with its successors and assigns,
the “Canadian Lenders” and, together with the U.S. Lenders, the “Combined
Lenders”), JPMORGAN CHASE BANK, N.A., as global administrative agent (in such
capacity, the “Global Administrative Agent”), and JPMORGAN CHASE BANK, N.A.,
TORONTO BRANCH, as Canadian administrative agent (in such capacity, the
“Canadian Administrative Agent”).
W I T N E S S E T H:
          1.     The U.S. Borrower, the Global Administrative Agent, the other
Agents party thereto and the U.S. Lenders are parties to that certain Amended
and Restated Credit Agreement dated as of February 9, 2007 (as amended,
supplemented, restated or otherwise modified from time to time, the “U.S. Credit
Agreement”), pursuant to which the U.S. Lenders agreed to make loans to, and
extensions of credit on behalf of, the U.S. Borrower.
          2.     The Canadian Borrower, the Global Administrative Agent, the
Canadian Administrative Agent, the other Agents party thereto and the Canadian
Lenders are parties to that certain Amended and Restated Credit Agreement dated
as of February 9, 2007 (as amended, supplemented, restated or otherwise modified
from time to time, the “Canadian Credit Agreement” and, together with the U.S.
Credit Agreement, the “Combined Credit Agreements”), pursuant to which the
Canadian Lenders agreed to make loans to, and extensions of credit on behalf of,
the Canadian Borrower.
          3.     The parties to the Combined Credit Agreements intend to amend
the Combined Credit Agreements as follows:
          NOW, THEREFORE, in consideration of the premises and the mutual
covenants herein contained, the parties hereto agree as follows:
          I.     Amendments to U.S. Credit Agreement.
          A.     The definition of “Applicable Margin” contained in Section 1.1
of the U.S. Credit Agreement is hereby amended in its entirety to read as
follows:
          “Applicable Margin” means, for any day and with respect to any
Eurodollar Loans, any ABR Loans, any Specified Rate Swingline Loans or any
Commitment Fees payable hereunder, as the case may be, the applicable percentage
rate per annum set forth below under the caption “Eurodollar Loans”, “ABR
Loans”, “Specified Rate Swingline Loans” or “Commitment Fees”, as the case may
be, based on the Global Borrowing Base Utilization on such date.

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                                                  Global Borrowing
Base Utilization:     Eurodollar     ABR Loans
(in basis points)     Specified Rate     Commitment Fees
(in basis points)         Loans         Swingline Loans             (in basis
points)         (in basis points)        
Less than 50%
      112.5         0         112.5         25.0      
50% or greater and
less than 75%
      137.5         0         137.5         30.0      
75% or greater and
less than 90%
      162.5         0         162.5         35.0      
90% or greater
      187.5         0         187.5         37.5      

For purposes of the foregoing, any change in the Applicable Margin will occur
automatically without prior notice upon any change in the Global Borrowing Base
Utilization. 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.
          B.     The definition of “Redetermination Date” contained in
Section 1.1 of the U.S. Credit Agreement is hereby amended in its entirety to
read as follows:
          “Redetermination Date” means (a) with respect to any Scheduled
Redetermination, each May 1 (or a date shortly thereafter as agreed upon between
the Borrower and the Global Administrative Agent), commencing May 1, 2008,
(b) with respect to any redetermination of the Global Borrowing Base or U.S.
Borrowing Base pursuant to Section 2.8(e), the first day of the first month
which is not less than twenty (20) Business Days following the date of a request
for a redetermination pursuant to Section 2.8(e), and (c) with respect to the
Interim Redetermination (as defined in the Second Amendment to Combined Credit
Agreements dated as of May 8, 2008 by and among the Borrower, the Canadian
Borrower, the Combined Lenders, the Global Administrative Agent and the Canadian
Administrative Agent), November 1, 2008 (or a date shortly thereafter as agreed
upon between the Borrower and the Global Administrative Agent).
          C.     Section 1.5 of the U.S. Credit Agreement is hereby amended in
its entirety to read as follows:
          “SECTION 1.5 Designation of Material Subsidiaries. The Borrower shall
from time to time, by notice in writing to the Global Administrative Agent and
the Lenders, be entitled to designate that either (a) a Subsidiary which is not
a Material Subsidiary become a Material Subsidiary (in which event the Borrower
will comply (or cause compliance) with the provisions of Section 5.15 with
respect to such Subsidiary), or (b) a Material Subsidiary which has previously
been designated in writing by the Borrower as a Material Subsidiary (and is not
otherwise a Material Subsidiary pursuant to clauses (b)(ii) or (iii) of the
definition thereof) cease to be a Material Subsidiary; provided, that the
Borrower shall not be entitled to designate that a Material Subsidiary cease to
be a Material Subsidiary if a Default, Event of Default, Global Borrowing Base
Deficiency or U.S. Borrowing Base Deficiency has occurred and is continuing or
would result from or exist immediately after such a designation.”

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          D.     Section 5.17(c) of the U.S. Credit Agreement is hereby amended
by revising the second sentence thereof in its entirety to read as follows:
          “On or before each Redetermination Date after the Closing Date and at
such other times as the Global Administrative Agent or Required Lenders shall
request, the Borrower and its Subsidiaries shall execute and deliver to
Administrative Agent, for the ratable benefit of each Lender (other than any
such Lender that has notified the Administrative Agent that it may not legally
benefit from same), Mortgages in form and substance reasonably acceptable to the
Global Administrative Agent and duly executed by the Borrower and any such
Subsidiary (as applicable) together with such other assignments, conveyances,
amendments, agreements and other writings, including, without limitation, UCC 1
financing statements as Administrative Agent shall deem reasonably necessary or
appropriate to grant, evidence and perfect the Liens granted pursuant to the
Security Documents with respect to Borrowing Base Properties acquired by the
Borrower and its Subsidiaries subsequent to the last date on which the Borrower
or any such Subsidiary was required to execute and deliver Mortgages pursuant to
Section 4.1(g), Section 5.15 or this Section 5.17, or which, for any other
reason are not the subject of valid, enforceable, perfected first priority Liens
(subject only to Permitted Encumbrances) in favor of the Global Administrative
Agent for the ratable benefit of each Lender (other than any such Lender that
has notified the Administrative Agent that it may not legally benefit from same)
covering the Required Reserve Value and the U.S. Required Reserve Value.”
          E.     Section 7.11 of the U.S. Credit Agreement is hereby amended in
its entirety to read as follows:
          “SECTION 7.11 Hedge Transactions. The Borrower will not, nor will the
Borrower permit any other Loan Party to, enter into any new Oil and Gas Hedge
Transactions which would cause the volume of Hydrocarbons with respect to which
a settlement payment is calculated under all Oil and Gas Hedge Transactions
(including such new transactions) to which the Borrower and/or any other Loan
Party is a party as of the date such Oil and Gas Hedge Transaction is entered
into to exceed (a)(i) for the calendar year in which such new Oil and Gas Hedge
Transaction is entered into (the “Initial Measurement Period”), eighty-five
percent (85%) of the aggregate of the Borrower’s and its Subsidiaries’
anticipated production from Proved Mineral Interests for each of oil and gas
(including natural gas liquids), calculated separately, (ii) for the calendar
year immediately following the end of the Initial Measurement Period (the
“Second Measurement Period”), eighty percent (80%) of the aggregate of the
Borrower’s and its Subsidiaries’ anticipated production from Proved Mineral
Interests for each of oil and gas (including natural gas liquids), calculated
separately, (iii) for the calendar year immediately following the end of the
Second Measurement Period (the “Third Measurement Period”), seventy-five percent
(75%) of the aggregate of the Borrower’s and its Subsidiaries’ anticipated
production from Proved Mineral Interests for each of oil and gas (including
natural gas liquids), calculated separately, and (iv) for the calendar year
immediately following the

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end of the Third Measurement Period and for each calendar year thereafter, one
hundred percent (100%) of the aggregate of the Borrower’s and its Subsidiaries’
anticipated production from Proved Producing Mineral Interests for each of oil
and gas (including natural gas liquids), calculated separately, plus, in each
case, (b) an amount not to exceed one hundred percent (100%) of associated
royalty owners’ oil, gas and/or natural gas liquids produced from the same
wells, and which oil, gas and/or natural gas liquids the Borrower has the
authority to market and sell, during the applicable measurement period; provided
that the Borrower will not, nor will the Borrower permit any other Loan Party
to, permit its production from Proved Producing Mineral Interests (whether or
not included or reflected in the most recent Reserve Report delivered to the
Global Administrative Agent and the Combined Lenders pursuant to Section 2.8)
during the then current month to be less than the aggregate amount of production
from Proved Producing Mineral Interests which are subject to Oil and Gas Hedge
Transactions during such month; provided further that the Borrower will not, nor
will the Borrower permit any other Loan Party to, enter into any Oil and Gas
Hedge Transaction (i) except in the ordinary course of business (and not for
speculative purposes) and (ii) with a counterparty with a rating of its senior,
unsecured, long-term indebtedness for borrowed money that is not guaranteed by
any other Person or subject to any other credit enhancement of lower than “BBB-”
or “Baa3” by S&P and Moody’s, respectively.”
          F.     Schedule 2.1 to the U.S. Credit Agreement is hereby amended by
replacing Schedule 2.1 to the U.S. Credit Agreement with Schedule 2.1 – U.S.
Credit Agreement to this Amendment.
          II.     Amendments to Canadian Credit Agreement.
          A.     The definition of “Applicable Margin” contained in Section 1.1
of the Canadian Credit Agreement is hereby amended in its entirety to read as
follows:
          “Applicable Margin” means, for any day and with respect to any
Eurodollar Loans, any Canadian Prime Loans, any U.S. Prime Loans, any Bankers’
Acceptances or any Commitment Fees payable hereunder, as the case may be, the
applicable percentage rate per annum set forth below under the caption
“Eurodollar Loans”, “U.S. Prime Loans”, “Canadian Prime Loans”, “Bankers’
Acceptances Stamping Fee” or “Commitment Fees”, as the case may be, based on the
Global Borrowing Base Utilization on such date.

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                                        Global Borrowing
Base Utilization:     Eurodollar
Loans
(in basis points)     U.S. Prime
Loans
(in basis points)     Canadian
Prime Loans
(in basis points)     Bankers’     Commitment
Fees
(in basis points)                     Acceptances                        
Stamping Fee                         (in basis points)        
Less than 50%
    112.5     0     0     112.5     25.0    
50% or greater and
less than 75%
    137.5     0     0     137.5     30.0    
75% or greater and
less than 90%
    162.5     0     0     162.5     35.0    
90% or greater
    187.5     0     0     187.5     37.5    

For purposes of the foregoing, any change in the Applicable Margin will occur
automatically without prior notice upon any change in the Global Borrowing Base
Utilization. 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.
          B.     Schedule 2.1 to the Canadian Credit Agreement is hereby amended
by replacing Schedule 2.1 to the Canadian Credit Agreement with Schedule 2.1 –
Canadian Credit Agreement to this Amendment.
          III.          Global Borrowing Base.
          A.     Subject to adjustments pursuant to Sections 2.8(d), (e), (g),
and (h) of the U.S. Credit Agreement, by execution of this Amendment, each of
the Global Administrative Agent, the Combined Lenders, the U.S. Lenders, the
U.S. Borrower and the Canadian Borrower agree during the period from the date
hereof to the earlier of (i) November 1, 2008 (the “Interim Redetermination
Date”) or (ii) the date of the next redetermination of the Global Borrowing Base
pursuant to the provisions of Section 2.8 of the U.S. Credit Agreement that
(a) the Global Borrowing Base shall equal U.S.$1,000,000,000, (b) the U.S.
Borrowing Base shall equal U.S.$710,000,000, (c) the Allocated U.S. Borrowing
Base shall equal U.S.$600,000,000, and (d) the Allocated Canadian Borrowing Base
shall equal U.S.$400,000,000.
          B.     Notwithstanding anything to the contrary contained in the U.S.
Credit Agreement, including, without limitation, Section 2.8 thereof, the Global
Borrowing Base and the U.S. Borrowing Base shall be redetermined at the request
of the U.S. Borrower on or about the Interim Redetermination Date pursuant to,
and in accordance with, Section 2.8(e) of the U.S. Credit Agreement (the
“Interim Redetermination”). In connection with such Interim Redetermination, the
U.S. Borrower shall deliver to the Global Administrative Agent prior to
October 1, 2008 a Reserve Report dated as of June 30, 2008 and such updated
engineering, production, operating and other data as the Global Administrative
Agent or any other Combined Lender may reasonably request; provided, that, such
Reserve Report may, in the discretion of the U.S. Borrower, be (i) a new Reserve
Report, (ii) the Reserve Report delivered in connection with the immediately
preceding redetermination (whether scheduled or unscheduled) of the Global
Borrowing Base and the U.S. Borrowing Base, and/or (iii) an update of such
Reserve Report described in subclause (ii) above. The Supermajority Lenders (in
the case of the Global

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Borrowing Base) or the U.S. Supermajority Lenders (in the case of the U.S.
Borrowing Base) (and, in either case, with the agreement of the U.S. Borrower,
such agreement in either case to be given in its sole discretion) if such number
would result in an increase in the Global Borrowing Base or U.S. Borrowing Base
or otherwise, the Required Lenders or U.S. Required Lenders, as the case may be,
shall approve and designate the new Global Borrowing Base and U.S. Borrowing
Base in accordance with the procedures and standards described in Section 2.8(b)
of the U.S. Credit Agreement and the U.S. Borrower shall provide a Borrowing
Base Allocation Notice to the Global Administrative Agent in accordance with
Section 2.8(d)(iii) of the U.S. Credit Agreement; provided that in the event
that the U.S. Borrower fails to provide such Borrowing Base Allocation Notice,
the Global Borrowing Base shall be allocated between the Allocated U.S.
Borrowing Base and Allocated Canadian Borrowing Base in accordance with
Section 2.8(d)(iii) of the U.S. Credit Agreement. Upon approval or deemed
approval of the Global Borrowing Base and U.S. Borrowing Base pursuant to the
Interim Redetermination, the Global Administrative shall deliver a Global
Borrowing Base Designation Notice to the U.S. Borrower and the Combined Lenders
designating the new U.S. Borrowing Base available to the U.S. Borrower and the
Global Borrowing Base available to the U.S. Borrower and the Canadian Borrower.
Without limiting the foregoing, the terms and provisions of Section 2.8 of the
U.S. Credit Agreement shall apply to the Interim Redetermination as if such
redetermination was a discretionary redetermination requested by the U.S.
Borrower pursuant to Section 2.8(e) of the U.S. Credit Agreement. If a Global
Borrowing Base Deficiency occurs as a result of the Interim Redetermination, the
U.S. Borrower will prepay, or cause to be prepaid, Loans (as defined in the U.S.
Credit Agreement) and Loans (as defined in the Canadian Credit Agreement) in
accordance with Section 2.11(b) of the U.S. Credit Agreement.
          C.     Each of the Global Administrative Agent, the Combined Lenders,
the U.S. Lenders, the U.S. Borrower and the Canadian Borrower agree and
acknowledge that (i) the determination of the Global Borrowing Base and U.S.
Borrowing Base set forth in Section III(a) of this Amendment is a Scheduled
Redetermination of the Global Borrowing Base and the U.S. Borrowing Base
pursuant to Section 2.8(b) of the U.S. Credit Agreement and (ii) such Scheduled
Redetermination of the Global Borrowing Base and the U.S. Borrowing Base shall
not be considered as a request for a “discretionary determination” of the Global
Borrowing Base and the U.S. Borrowing Base by the Borrower, the Global
Administrative Agent or the Required Lenders for the purposes of Section 2.8(e)
of the U.S. Credit Agreement.
          D.     In accordance with Section 2.1(c) of each of the U.S. Credit
Agreement and the Canadian Credit Agreement, the Global Administrative Agent
hereby notifies the Canadian Administrative Agent, the Combined Lenders, the
U.S. Borrower and the Canadian Borrower of the reallocation of the Global
Commitments under the Combined Credit Agreements as set forth and described on
Schedule 2.1 — U.S. Credit Agreement and Schedule 2.1 — Canadian Credit
Agreement attached hereto.
          IV.     Rearrangement of Existing Loans. Upon the effectiveness of
this Amendment:
          A.     All of the Combined Commitments and outstanding Combined
Obligations under the Combined Credit Agreements as of the date of such
effectiveness shall hereby be restructured, rearranged, renewed, extended and
continued under the applicable Combined Credit Agreement (as amended hereby) and
all Combined Loans and Letters of Credit outstanding

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under the applicable Combined Credit Agreement as of the date of such
effectiveness shall hereby become Combined Loans and Letters of Credit
outstanding under the applicable Combined Credit Agreement (as amended hereby).
          B.     In connection herewith, the Combined Lenders party to the
Combined Credit Agreements prior to the effectiveness of this Amendment (the
“Existing Lenders”) hereby sell, assign, transfer and convey, and the Combined
Lenders hereby purchase and accept, so much of the aggregate Combined
Commitments under, Combined Loans outstanding under, and participations in
Letters of Credit issued pursuant to, the Combined Credit Agreements such that
the Combined Commitment of each Combined Lender shall be as set forth on
Schedule 2.1 to each of the Combined Credit Agreements (as amended hereby). The
foregoing assignments, transfers and conveyances are without recourse to the
Existing Lenders and without any warranties whatsoever by any Agent, any Issuing
Bank or any Existing Lender as to title, enforceability, collectibility,
documentation or freedom from liens or encumbrances, in whole or in part, other
than the warranty of each Existing Lender that it has not previously sold,
transferred, conveyed or encumbered such interests.
          V.     Effectiveness. This Amendment shall become effective as of the
date (the “Effective Date”) when the Global Administrative Agent shall have
received:
          A.     Counterparts hereof duly executed by the U.S. Borrower, the
Canadian Borrower, the Global Administrative Agent, the Canadian Administrative
Agent and the Combined Lenders (or, in the case of any party as to which an
executed counterpart shall not have been received, telegraphic, telex, or other
written confirmation from such party of execution of a counterpart hereof by
such party).
          B.     To the extent required pursuant to Section 5.17(c) of the U.S.
Credit Agreement after giving effect to the establishment of the Global
Borrowing Base and the U.S. Borrowing Base pursuant to Article III.A. hereof,
Mortgages duly executed by the U.S. Borrower and/or any of its Subsidiaries (as
applicable), together with such other agreements and documents as required by
the terms of Section 5.17(c) and Section 5.17(d) of the U.S. Credit Agreement.
          C.     An amendment fee for the account of each Combined Lender which
is increasing their Combined Commitment in the manner and amount agreed upon
between U.S. Borrower and the Global Administrative Agent in that certain fee
letter dated April 16, 2008 and such other fees otherwise agreed to in writing
by the U.S. Borrower.
          VI.     Reaffirmation of Representations and Warranties. To induce the
Combined Lenders and the Global Administrative Agent to enter into this
Amendment, the U.S. Borrower and the Canadian Borrower hereby reaffirm, as of
the date hereof, the following:
               (i)     The representations and warranties of each Loan Party (as
such term is defined in the U.S. Credit Agreement and the Canadian Credit
Agreement, collectively, the “Combined Loan Parties”) set forth in the Combined
Loan Documents to which it is a party are true and correct on and as of the date
hereof (or, if stated to have been made expressly as of an earlier date, were
true and correct in all material respects as of such date and, except to the
extent waived in writing by the Combined Lenders, the

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Required Lenders, the Majority Lenders, the U.S. Lenders or the U.S. Required
Lenders, as applicable).
          (ii)     Each of the Combined Loan Parties (a) is a corporation or
limited partnership duly incorporated or organized (as applicable), validly
existing and in good standing under the laws of its jurisdiction of
incorporation or organization, (b) has all corporate or limited partnership
power (as applicable) and all material governmental licenses, authorizations,
consents and approvals required to carry on its businesses as now conducted and
as proposed to be conducted, and (c) is duly qualified to transact business as a
foreign corporation or limited partnership in each jurisdiction where a failure
to be so qualified would reasonably be expected to have a Material Adverse
Effect.
          (iii)     The execution, delivery and performance of this Amendment
and the other Combined Loan Documents by each Combined Loan Party (to the extent
each Combined Loan Party is a party to this Amendment and such Combined Loan
Documents) (a) are within such Combined Loan Party’s corporate or limited
partnership powers, (b) when executed will be duly authorized by all necessary
corporate or limited partnership action, (c) require no action by or in respect
of, or filing with, any Governmental Authority (other than (1) actions or
filings pursuant to the Exchange Act and (2) actions or filings that have been
taken or made and are in full force and effect) and (d) do not contravene, or
constitute a default under, any provision of applicable Governmental Rule
(including, without limitation, Regulation U) or of the articles or certificate
of incorporation, bylaws, regulations, partnership agreement or comparable
charter documents of any Combined Loan Party or of any agreement, judgment,
injunction, order, decree or other instrument binding upon any Combined Loan
Party or result in the creation or imposition of any Lien on any Borrowing Base
Property or Collateral other than the Liens securing the Combined Obligations.
          (iv)     This Amendment and each other Combined Loan Document
constitutes, or when executed and delivered will constitute, valid and binding
obligations of each Combined Loan Party which is a party thereto, enforceable
against each such Combined Loan Party which executes the same in accordance with
its terms except as the enforceability thereof may be limited by (a) bankruptcy,
insolvency, reorganization, moratorium, or similar Governmental Rules affecting
creditors’ rights generally, and (b) equitable principles of general
applicability (whether enforcement is sought by proceedings at law or in
equity).
          (v)     Neither a Default nor an Event of Default has occurred and
will exist under either Combined Credit Agreement after giving effect to the
transactions contemplated by this Amendment or the other Combined Loan
Documents. Neither the U.S. Borrower or any of its Subsidiaries nor the Canadian
Borrower or any of its Subsidiaries is in default under, 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 under, any
Material Agreement to which the U.S. Borrower or any of its Subsidiaries or the
Canadian Borrower or any of its Subsidiaries is a party or by which the U.S.
Borrower or any of its Subsidiaries or the Canadian Borrower or any of its
Subsidiaries is bound which default would reasonably be expected to have a
Material

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Adverse Effect. The U.S. Borrower is in compliance with the financial covenants
set forth in Article VI of the U.S. Credit Agreement.
               (vi)     No event or events have occurred since December 31, 2007
which individually or in the aggregate would reasonably be expected to have a
Material Adverse Effect.
          VII.     Defined Terms. Terms used herein when defined in the U.S.
Credit Agreement (including, to the extent applicable, after giving effect to
this Amendment) shall have the same meanings herein unless the context otherwise
requires.
          VIII.     Reaffirmation of Combined Credit Agreements. This Amendment
shall be deemed to be an amendment to the Combined Credit Agreements, and the
Combined Credit Agreements, as amended hereby, are hereby ratified, approved and
confirmed in each and every respect. All references to the Combined Credit
Agreements herein and in any other document, instrument, agreement or writing
shall hereafter be deemed to refer to the Combined Credit Agreements as amended
hereby.
          IX.     Governing Law. THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE
WITH THE LAWS OF THE STATE OF TEXAS.
          NOTWITHSTANDING THE FOREGOING SENTENCE AND AFTER GIVING EFFECT TO THE
TEXTUAL AMENDMENTS CONTAINED IN SECTIONS I AND II OF THIS AMENDMENT, (i) THE
U.S. CREDIT AGREEMENT (AS AMENDED HEREBY) SHALL CONTINUE TO BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAW SPECIFIED IN SECTION 10.9(a) OF THE U.S.
CREDIT AGREEMENT, AND (ii) THE CANADIAN CREDIT AGREEMENT (AS AMENDED HEREBY)
SHALL CONTINUE TO BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW
SPECIFIED IN SECTION 10.9(a) OF THE CANADIAN CREDIT AGREEMENT.
          X.     Severability of Provisions. Any provision of this Amendment
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; and the invalidity of a particular provision
in a particular jurisdiction shall not invalidate such provision in any other
jurisdiction.
          XI.     Counterparts. This Amendment 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. Delivery of an executed counterpart of a signature page of this
Amendment by telecopy (or other electronic transmission acceptable to the Global
Administrative Agent) shall be effective as delivery of a manually executed
counterpart of this Amendment.
          XII.     Headings. Article and Section headings used herein are for
convenience of reference only, are not part of this Amendment and shall not
affect the construction of, or be taken into consideration in interpreting, this
Amendment.

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          XIII.          Successors and Assigns. This Amendment 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 an Issuing
Bank that issues any Letter of Credit), except that neither the U.S. Borrower
nor the Canadian Borrower may assign or otherwise transfer any of its rights or
obligations hereunder without the prior written consent of the Global
Administrative Agent, each Issuing Bank and each Combined Lender (and any
attempted assignment or transfer by either the U.S. Borrower or the Canadian
Borrower without such consent shall be null and void).
          XIV.          No Oral Agreements. THIS AMENDMENT, THE COMBINED CREDIT
AGREEMENTS, AS AMENDED HEREBY, AND THE OTHER COMBINED LOAN DOCUMENTS REPRESENT
THE FINAL AGREEMENT BETWEEN AND AMONG THE PARTIES WITH RESPECT TO THE SUBJECT
MATTER HEREOF AND THEREOF AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO
UNWRITTEN ORAL AGREEMENTS AMONG THE PARTIES.
          XV.          Loan Document. This Amendment constitutes a “Loan
Document,” a “Canadian Loan Document” and a “Combined Loan Document” under and
as defined in the U.S. Credit Agreement, and a “Loan Document,” a “U.S. Loan
Document” and a “Combined Loan Document” under and as defined in the Canadian
Credit Agreement.
[Signature Pages to Follow]

10

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          IN WITNESS WHEREOF, the U.S. Borrower, the Canadian Borrower, the
undersigned Combined Lenders, the Global Administrative Agent and the Canadian
Administrative Agent have executed this Amendment as of the date first above
written.

            U.S. BORROWER

QUICKSILVER RESOURCES INC.,
a Delaware corporation, as U.S. Borrower

      By:  /s/ MarLu Hiller              MarLu Hiller, Vice President –
Treasurer       CANADIAN BORROWER

QUICKSILVER RESOURCES CANADA INC.,
an Alberta, Canada corporation, as Canadian Borrower

      By:  /s/ MarLu Hiller              MarLu Hiller,  Vice President –
Treasurer     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            AGENTS AND COMBINED LENDERS

JPMORGAN CHASE BANK, N.A., as Global Administrative Agent and as a U.S. Lender

      By:  /s/ J. Scott Fowler               J. Scott Fowler             Senior
Vice President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            JPMORGAN CHASE BANK, N.A., TORONTO BRANCH, as a Canadian
Administrative Agent and as a Canadian Lender

      By:  /s/ Michael N. Tam          Name:   Michael N. Tam        Title:  
Senior Vice President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            BANK OF AMERICA, N.A., as a U.S. Lender

      By:  /s/ Ronald E. McKaig        Name:    Ronald E. McKaig      Title:   
Senior Vice President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            BNP PARIBAS, as a U.S. Lender

      By:  /s/ Russell Otts        Name:    Russell Otts      Title:   
Director       
      By:  /s/ Robert Long        Name:    Robert Long      Title:    Vice
President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            FORTIS CAPITAL CORP., as a U.S. Lender

      By:  /s/ David Montgomery        Name:    David Montgomery      Title:   
Director       
      By:  /s/ Darrell Holley        Name:    Darrell Holley      Title:   
Managing Director     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            THE BANK OF NOVA SCOTIA, as a U.S. Lender

      By:  /s/ David Mills        Name:    David Mills      Title:    Director 
   

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            DEUTSCHE BANK TRUST COMPANY AMERICAS, as a U.S. Lender

      By:  /s/ Dusan Lazarov        Name:    Dusan Lazarov      Title:    Vice
President       
      By:  /s/ Erin Morrissey        Name:    Erin Morrissey      Title:    Vice
President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            THE ROYAL BANK OF SCOTLAND plc, as a U.S. Lender

      By:  /s/ Lucy Walker        Name:    Lucy Walker      Title:    Vice
President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            CALYON NEW YORK BRANCH, as a U.S. Lender

      By:  /s/ Sharada Manne      Name:    Sharada Manne      Title:   
Director       
      By:  /s/ Michael D. Willis        Name:    Michael D. Willis      Title: 
  Director     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            CITIBANK, N.A., as a U.S. Lender

      By:  /s/ David E. Hunt        Name:    David E. Hunt      Title:    Vice
President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            UNION BANK OF CALIFORNIA, N.A., as a U.S. Lender

      By:  /s/ Alison Fuqua        Name:    Alison Fuqua      Title:   
Assistant Vice President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            WELLS FARGO BANK, N.A., as a U.S. Lender

      By:  /s/ Charles D. Kirkham        Name:    Charles D. Kirkham     
Title:    Senior Vice President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            TORONTO DOMINION (TEXAS) LLC, as a U.S. Lender
              By:  /s/ Debbi L. Brito        Name:    Debbi L. Brito     
Title:    Authorized Signatory     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            U.S. BANK NATIONAL ASSOCIATION, as a U.S. Lender

      By:  /s/ Daria Mahoney        Name:    Daria Mahoney      Title:    Vice
President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            COMPASS BANK, as a U.S. Lender

      By:  /s/ Murray E. Brasseux        Name:    Murray E. Brasseux     
Title:    Executive Vice President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            SOCIÉTÉ GÉNÉRALE, as a U.S. Lender

      By:  /s/ Stephen W. Warfel        Name:    Stephen W. Warfel      Title: 
  Managing Director     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            COMERICA BANK, as a U.S. Lender

      By:  /s/ Rebecca L. Wilson        Name:    Rebecca L. Wilson      Title: 
  Assistant Vice President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            STERLING BANK, as a U.S. Lender

      By:  /s/ Melissa A. Bauman        Name:    Melissa A. Bauman      Title: 
  Senior Vice President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            CIBC INC., as a U.S. Lender

      By:  /s/ Dominic J. Sorresso        Name:    Dominic J. Sorresso     
Title:    Executive Director
    CIBC World Market Corp.
Authorized Signatory

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            KEYBANK, N.A., as a U.S. Lender

      By:  /s/ Thomas Rajan     Name:    Thomas Rajan      Title:    Managing
Director     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            EXPORT DEVELOPMENT CANADA, as a U.S. Lender

      By:  /s/ François Morel       Name:    François Morel      Title:    Sr.
Financing Manager       
      By:  /s/ Margaret Michalski       Name:    Margaret Michalski      Title: 
  Senior Associate     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            BARCLAYS BANK PLC, as a U.S. Lender

      By:  /s/ Joseph Gyurindak       Name:    Joseph Gyurindak      Title:   
Director     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            CREDIT SUISSE, CAYMAN ISLANDS BRANCH, as a U.S. Lender

      By:  /s/ Doreen Barr       Name:    Doreen Barr      Title:    Vice
President       
      By:  /s/ Morenikeji Ajayi       Name:    Morenikeji Ajayi      Title:   
Associate     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            BANK OF AMERICA, N.A. (by its Canada branch), as a Canadian Lender

      By:  /s/ Medina Sales de Andrade       Name:    Medina Sales de Andrade   
  Title:    Vice President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            BNP PARIBAS (CANADA), as a Canadian Lender

      By:  /s/ Christopher Rice       Name:    Christopher Rice      Title:   
Vice President       
      By:  /s/ Michael Gosselin       Name:    Michael Gosselin      Title:   
Managing Director     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            FORTIS CAPITAL (CANADA) LTD., as a Canadian Lender

      By:  /s/ Doug Clark       Name:    Doug Clark      Title:    Director     
 
      By:  /s/ Cory Wallin       Name:    Cory Wallin      Title:    Assistant
Vice President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            THE BANK OF NOVA SCOTIA, as a Canadian Lender

      By:  /s/ Andrew Kellock       Name:    Andrew Kellock      Title:   
Director       
      By:  /s/ Todd Kennedy       Name:    Todd Kennedy      Title:   
Associate     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            DEUTSCHE BANK AG CANADA BRANCH, as a Canadian Lender

      By:  /s/ Robert A. Johnston       Name:    Robert A. Johnston      Title: 
  Director       
      By:  /s/ Marcellus Leung       Name:    Marcellus Leung      Title:   
Assistant Vice President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            CITIBANK, N.A., CANADIAN BRANCH, as a Canadian Lender

      By:  /s/ Niyousha Zarinpour       Name:    Niyousha Zarinpour      Title: 
  Authorized Signer     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            UNION BANK OF CALIFORNIA, N.A., CANADA BRANCH,
as a Canadian Lender

      By:  /s/ Phil Taylor       Name:    Phil Taylor      Title:    Senior Vice
President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            WELLS FARGO FINANCIAL CORPORATION CANADA,
as a Canadian Lender

      By:  /s/ Nick Scarfo       Name:    Nick Scarfo      Title:    Vice
President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            THE TORONTO-DOMINION BANK, as a Canadian Lender
            By:  /s/ Debbi L. Brito       Name:    Debbi L. Brito      Title:   
Authorized Signatory     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            U.S. BANK NATIONAL ASSOCIATION, as a Canadian Lender

      By:  /s/ Kevin Jephcott       Name:    Kevin Jephcott      Title:   
Principal Officer     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            SUMITOMO MITSUI BANKING CORPORATION OF CANADA, as a Canadian Lender

      By:  /s/ Alfred Lee       Name:    Alfred Lee      Title:    Senior Vice
President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            SOCIÉTÉ GÉNÉRALE (CANADA BRANCH), as a Canadian Lender

      By:  /s/ David BALDONI       Name:    David BALDONI      Title:   
Managing Director       
      By:  /s/ Paul PRIMAVESI       Name:    Paul PRIMAVESI      Title:    Vice
President     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            COMERICA BANK, CANADA BRANCH, as a Canadian Lender

      By:  /s/ Omer Ahmed       Name:    Omer Ahmed      Title:    Portfolio
Manager     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            CANADIAN IMPERIAL BANK OF COMMERCE, as a Canadian Lender

      By:  /s/ Randy Geislinger       Name:    Randy Geislinger      Title:   
Executive Director       
      By:  /s/ Chris Perks       Name:    Chris Perks      Title:    Executive
Director     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            KEYBANK, N.A., as a Canadian Lender

      By:  /s/ Kevin Hays       Name:    Kevin Hays      Title:    Director     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            BARCLAYS BANK PLC, as a Canadian Lender

      By:  /s/ Joseph Gyurindak       Name:    Joseph Gyurindak      Title:   
Director     

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

 

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            CREDIT SUISSE, TORONTO BRANCH, as a Canadian Lender

      By:  /s/ Alain Daoust       Name:    Alain Daoust      Title:    Director 
     
      By:  /s/ Bruce F. Wetherly       Name:    Bruce F. Wetherly      Title:   
Director,
CREDIT SUISSE, TORONTO BRANCH    

[Signature Page]
Second Amendment to Combined Credit Agreements
Quicksilver Resources Inc.