Document:

exv10w8

 

Exhibit 10.8

CONVERTIBLE PROMISSORY NOTE

			
	 	 	 
	$10,000,000
	 	June 25, 2007

     FOR VALUE RECEIVED, Approach Oil & Gas Inc., a Delaware corporation (the “Company”), hereby
promises to pay to the order of LUBAR EQUITY FUND, LLC, a Wisconsin limited liability company (the
“Lender”), the principal sum of Ten Million and no/100 Dollars ($10,000,000), together with
interest thereon from the date of this Convertible Promissory Note (this “Note”) on the unpaid
principal balance. Interest shall accrue at a rate of seven percent (7%) per annum based on a
three hundred sixty-five (365) – day year and compounded annually. Principal and accrued interest
shall be due and payable on the third anniversary of the date of this Note; provided, that the
Company shall have the right to prepay the principal in whole or in part from time to time without
premium or penalty provided that the Company gives the Lender at least fifteen (15) days prior
notice of such prepayment. Lender shall have the right to exercise its conversion rights in whole
or in part prior to such prepayment.

     All payments shall be made in lawful money of the United States of America at the principal
office of the Lender, or at such other place as the holder hereof may from time to time designate
in writing to the Company. All payments shall be credited first to the accrued interest then due
and payable and the remainder applied to principal.

     At any time commencing December 31, 2007 or earlier in connection with the Company’s
prepayment hereof or the occurrence of a “Sales Event” as defined below, the Lender shall have the
right, in its sole and absolute discretion, to convert all or any portion of the unpaid principal
of and interest on this Note into shares of the equity securities of the Company or any successor
to the Company of any class or classes issued by the Company or its successor prior to the date of
the Lender’s election. Except as provided below with respect to an automatic conversion upon the
occurrence of an IPO (defined below), the number of shares of such equity securities to be issued
upon such conversion shall be equal to the quotient obtained by dividing (a) by (b), where (a) is
the outstanding principal and accrued interest of this Note (or such portion as will be converted),
and (b) is (i) the lowest price per share that equity securities in any such class have been issued
by the Company, or (ii) if no such shares have been issued, then at One Hundred and no/100 Dollars
($100) per share. The conversion price will be subject to adjustment to provide the Lender with
full antidilution protection in the case of any stock splits, recapitalizations or changes in
capital structure of the Company or the issuance of options, warrants, or other rights to acquire
or convertible into equity securities of the Company excluding only options, warrants, rights or
other equity-based awards issued as part of reasonable compensation plans approved by the Company’s
Board of Directors. Shares issued for consideration other than cash shall be deemed to be issued at
the fair market value of the consideration given for them.

     The first day on which both of the following transactions shall have been consummated shall be
referred to herein as the “IPO Conversion Date”: (a) the initial sale by Approach Resources Inc., a
Delaware corporation, of shares of its common stock, par value $0.01 per share

 

 

(the “Approach Common Stock”), to the public pursuant to a registration statement under the
Securities Act of 1933, as amended (“IPO”), and (b) the exchange of all outstanding shares of
Company Common Stock for shares of Approach Common Stock and the consummation of the other
transactions contemplated by the terms of a contribution agreement by and among Approach, the
Company and certain other parties thereto (the “Contribution Agreement”). Notwithstanding anything
to the contrary contained herein, this Note shall, on the IPO Conversion Date, automatically and
without further action required by any person, convert into shares of Approach Common Stock. The
number of shares of Approach Common Stock to be issued upon such automatic conversion shall be
equal to the quotient obtained by dividing (a) by (b), where (a) is the outstanding principal and
accrued interest of this Note, and (b) is the initial public offering price per share, less any
underwriting discount per share for the shares of Approach Common Stock that are issued in the IPO.
The shares of Approach Common Stock issued to Lender upon any automatic conversion of this Note
shall be entitled to the same registration rights as those provided to holders of shares of Company
Common Stock whose shares are exchanged into shares of Approach Common Stock pursuant to the
Contribution Agreement. Approach shall execute an agreement with the Lender reflecting those rights
on or prior to the IPO Conversion Date.

     The Lender shall be granted no less protective rights with regards to such shares of equity
securities (including preferences and voting rights) acquired pursuant to the conversion of this
Note as are granted to any other holder of such shares of equity securities. If only a portion of
this Note is converted into equity securities, the Company shall return this Note to the Lender
with a notation thereon of the remaining outstanding principal of this Note or, at the request of
the Lender, shall issue and deliver to the Lender a replacement convertible secured promissory note
for the remaining outstanding balance hereof, such Note containing the same material terms as set
forth herein. The issuance of certificates for shares of equity securities upon conversion of this
Note will be made without charge to the Lender for any issuance tax in respect thereof or other
cost incurred by the Company in connection with such conversion and the related issuance of shares
of equity securities. Upon conversion of this Note, the Company will take all such actions as are
necessary in order to ensure that the shares issuable with respect to such conversion will be
validly issued, fully paid and nonassessable.

     The following will be deemed to constitute events of default under the Note:

	 	a)	 	The Company shall fail to make when due any payment of principal or
interest under this Note and such failure shall remain uncured for a period of five
(5) business days.
	 
	 	b)	 	The Company shall fail to perform or observe, in any material respect,
any provision of this Note or any material agreement or contract to which it is a
party or by which it or its assets are bound, and such default shall continue for
more than thirty (30) days after written notice from Lender is received by Borrower
or,

2

 

	 	 	 	notwithstanding the foregoing, the Company fails to give a timely “Default Notice”
as defined below.
	 
	 	c)	 	Any representation or warranty made by the Company herein, or any
statement, written information or certificate furnished by the Company in
connection with the transactions contemplated hereby, proves untrue in any material
respect as of the date of the issuance or making thereof or omits any statement
necessary to make the statements contained therein, in light of the circumstances
under which they were made, not false or misleading.
	 
	 	d)	 	The Company shall default in the payment when due (whether by scheduled
maturity, required prepayment, acceleration, demand or otherwise) of any amount
owing in respect of any indebtedness in the aggregate principal amount of Two
Hundred Fifty Thousand and no/100 Dollars ($250,000) or more, or shall default in
the performance or observance of any obligation or condition with respect to any
such indebtedness or any other event shall occur or condition exist, if the effect
of such default, event or condition is to accelerate the maturity of any such
indebtedness or to permit the holder or holders thereof, or any trustee or agent
for such holders, to accelerate the maturity of any such indebtedness, or any such
indebtedness shall become or be declared to be due and payable prior to its stated
maturity and such default has not been cured within any grace period provided for
in the instrument under which the default arose.
	 
	 	e)	 	(i) The Company shall commence a voluntary case concerning itself under
the United States Bankruptcy Code; (ii) an involuntary case is commenced against
the Company and the petition is not contested within fifteen (15) days, or is not
dismissed or stayed within sixty (60) days, after commencement of the case; (iii) a
custodian (as defined in the United States Bankruptcy Code) is appointed for, or
takes charge of, all or substantially all of the property of the Company or the
Company commences any other proceedings under any reorganization, arrangement,
adjustment of debt, relief of debtors, dissolution, insolvency or liquidation or
similar law of any jurisdiction whether now or hereafter in effect relating to the
Company or there is commenced against the Company any such proceeding which remains
undismissed and unstayed for a period of sixty (60) days; (iv) any order of relief
or other order approving any such case or proceeding is entered; (v) the Company is
adjudicated insolvent or bankrupt; (vi) the Company suffers any appointment of any
custodian or the like for it or any substantial part of its property to continue
undischarged and unstayed for a period of fifteen (15) days; (vii) the Company
makes a general assignment for the benefit of creditors; (viii) the Company shall
fail to pay, or shall state that it is unable to pay, or shall be unable to pay,
its debts generally as they become due and such failure or inability to pay shall
not have been cured within fifteen (15) days; (ix) the Company shall call a meeting
of its creditors with a view to arranging a

3

 

	 	 	 	composition or adjustment of its debts; (x) the Company shall by any act or failure
to act consent to, approve of or acquiesce in any of the foregoing; (xi) any
corporate action is taken by the Company for the purpose of effecting any of the
foregoing.
	 
	 	f)	 	Any judgment, writ or warrant of attachment or of any similar
post-judgment process in an amount in excess of Two Hundred Fifty Thousand and
no/100 Dollars ($250,000) shall be entered or filed against the Company or against
any of its properties or assets and remain unsatisfied and unstayed for a period
of sixty (60) days; provided, that if any such judgment, writ or warrant is not
satisfied or stayed within such sixty (60) – day period, an event of default shall
not exist if prior to the end of such sixty (60) – day period the Company provides
to Lender a statement from Lender’s insurance carrier that the entire amount of
such judgment, writ or warrant is a covered loss under the insurance policies that
the Company maintains with such carrier and that such carrier does not dispute such
coverage and will provide the Company with such proceeds of insurance required to
satisfy such judgment, writ or warrant;
	 
	 	g)	 	The Company dissolves, liquidates or otherwise ceases to actively
conduct business.
	 
	 	h)	 	The Company shall fail in any material respect to comply with any law,
rule, regulation or order to which it or its assets are subject and such failure to
comply remains uncured for more than thirty (30) days after written notice from
Lender is received by the Company.

     Upon the occurrence of any condition, event or act described above, the Company shall give
written notice thereof (a “Default Notice”) to the Lender within five (5) business days of
receiving knowledge of such condition, event or act.

     Upon the occurrence of any event of default described in section (a)-(d), or (f)-(h) above the
Lender may, at its option upon written notice to the Company, declare the Note to be immediately
due and payable in full. Upon the occurrence of any Event of Default described in section (e) the
Note shall become immediately due and payable without any action on the part of the Lender.

     The Company represents and warrants to the Lender that it has all power and authority to enter
into this Note.

     This Note shall be governed by and construed in accordance with the laws of the State of New
York.

4

 

     The Company hereby agrees, subject only to any limitation imposed by applicable law, to pay
all expenses, including reasonable attorneys’ fees and legal expenses, incurred by the Lender in
endeavoring to collect any amounts payable hereunder that are not paid when due, whether by
declaration or otherwise.

     Notwithstanding anything to the contrary contained in this Note, in no event shall the
interest payable hereon, whether before or after maturity, exceed the maximum interest which, under
applicable law, may be charged on this Note.

     The Company hereby expressly waives presentment, demand for payment, dishonor, notice of
dishonor, protest, notice of protest and any other formality.

     The Company will give the Lender written notice of any contemplated “Sales Event,” at least
ten (10) business days prior to the record date for determining which holders of equity securities
may vote with respect to or participate in such Sales Event. Except as set forth below in this
paragraph, “Sales Event” shall mean the sale or distribution of substantially all of the assets of
the Company or a merger or consolidation of the Company with or into another entity or the sale of
a majority of the Company’s stock by its shareholders. If the Lender does not elect to convert this
Note prior to the occurrence of a Sales Event, it may declare the Note due and payable at any time
up to the next business day after consummation of the Sales Event. Notwithstanding the above,
neither the consummation of the Contribution Agreement nor the IPO shall constitute a Sales Event
for purposes of this Note. Upon the consummation of the Contribution Agreement and the IPO, the
conversion of this Note shall be governed by the terms of the fourth full paragraph herein.

     So long as this Note is outstanding, the Company will deliver quarterly financial statements
to the Lender within forty-five (45) days after the end of each calendar quarter and audited
financial statements within one hundred twenty (120) days after the end of each calendar year and
the Lender may inspect the books and records of the Company upon reasonable notice.

     IN WITNESS WHEREOF, the undersigned, by its duly authorized and acting executive officer, has
executed this Note as of the date first set forth above.

	 	 	 	 	 
	 	APPROACH OIL & GAS INC.

 	 
	 	By:  	/s/ J. Ross Craft
 	 
	 	 	J. Ross Craft, 	 
	 	 	President and Chief Executive Officer 	 
	 

5exv10w9

 

 Exhibit 10.9

AMENDED AND RESTATED

CREDIT AGREEMENT

AMONG

APPROACH RESOURCES I, LP

AS BORROWER,

THE FROST NATIONAL BANK

AND THE INSTITUTIONS NAMED HEREIN

AS LENDERS,

AND

THE FROST NATIONAL BANK

AS ADMINISTRATIVE AGENT

FEBRUARY 15, 2007

$100,000,000 REVOLVING CREDIT

 

 

TABLE OF CONTENTS

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	Page No.	 
	1.	 	Definitions	 	 	1	 
	2.	 	Commitments of Lenders	 	 	10	 
	 
	 	(a)	 	Terms of Commitment	 	 	10	 
	 
	 	(b)	 	Procedure for Borrowing	 	 	10	 
	 
	 	(c)	 	Letters of Credit	 	 	11	 
	 
	 	(d)	 	Procedure for Obtaining Letters of Credit	 	 	12	 
	 
	 	(e)	 	Outstanding Letters of Credit	 	 	12	 
	 
	 	(f)	 	Voluntary Reduction of Borrowing Base	 	 	12	 
	 
	 	(g)	 	Mandatory Borrowing Base Reductions	 	 	12	 
	 
	 	(h)	 	Several Obligations	 	 	13	 
	 
	 	(i)	 	Type and Number of Advances	 	 	13	 
	3.	 	Notes Evidencing Loans	 	 	13	 
	 
	 	(a)	 	Form of Notes	 	 	13	 
	 
	 	(b)	 	Issuance of Additional Notes	 	 	13	 
	 
	 	(c)	 	Interest Rates	 	 	13	 
	 
	 	(d)	 	Payment of Interest	 	 	13	 
	 
	 	(e)	 	Payment of Principal	 	 	14	 
	 
	 	(f)	 	Payment to Lenders	 	 	14	 
	 
	 	(g)	 	Sharing of Payments, Etc.	 	 	14	 
	 
	 	(h)	 	Non-Receipt of Funds by Agent	 	 	14	 
	4.	 	Interest Rates	 	 	15	 
	 
	 	(a)	 	Options	 	 	15	 
	 
	 	(b)	 	Interest Rate Determination	 	 	16	 
	 
	 	(c)	 	Conversion Option	 	 	16	 
	 
	 	(d)	 	Recoupment	 	 	16	 
	 
	 	(e)	 	Interest Rates Applicable After Default	 	 	16	 
	5.	 	Special Provisions Relating to Loans	 	 	16	 
	 
	 	(a)	 	Unavailability of Funds or Inadequacy of Pricing	 	 	17	 
	 
	 	(b)	 	Change in Laws	 	 	17	 
	 
	 	(c)	 	Increased Cost or Reduced Return	 	 	17	 
	 
	 	(d)	 	Discretion of Lender as to Manner of Funding	 	 	19	 
	 
	 	(e)	 	Breakage Fees	 	 	19	 
	6.	 	Collateral Security	 	 	20	 
	7.	 	Borrowing Base	 	 	21	 
	 
	 	(a)	 	Initial Borrowing Base	 	 	21	 
	 
	 	(b)	 	Subsequent Determinations of Borrowing Base	 	 	21	 
	8.	 	Fees	 	 	22	 
	 
	 	(a)	 	Up-Front Fee	 	 	22	 
	 
	 	(b)	 	Unused Commitment Fee	 	 	22	 
	9.	 	Prepayments	 	 	23	 
	 
	 	(a)	 	Voluntary Prepayments	 	 	23	 
	 
	 	(b)	 	Mandatory Prepayment For Borrowing Base Deficiency	 	 	23	 

i 

 

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	Page No.	 
	10.	 	Representations and Warranties	 	 	23	 
	 
	 	(a)	 	Organization and Qualification	 	 	23	 
	 
	 	(b)	 	Power and Authority	 	 	23	 
	 
	 	(c)	 	Binding Obligations	 	 	24	 
	 
	 	(d)	 	No Legal Bar or Resultant Lien	 	 	24	 
	 
	 	(e)	 	No Consent	 	 	24	 
	 
	 	(f)	 	Financial Condition	 	 	24	 
	 
	 	(g)	 	Liabilities	 	 	24	 
	 
	 	(h)	 	Litigation	 	 	25	 
	 
	 	(i)	 	Taxes; Governmental Charges	 	 	25	 
	 
	 	(j)	 	Titles, Etc.	 	 	25	 
	 
	 	(k)	 	Defaults	 	 	26	 
	 
	 	(l)	 	Casualties; Taking of Properties	 	 	26	 
	 
	 	(m)	 	Use of Proceeds; Margin Stock	 	 	26	 
	 
	 	(n)	 	Location of Business and Offices	 	 	26	 
	 
	 	(o)	 	Compliance with the Law	 	 	26	 
	 
	 	(p)	 	No Material Misstatements	 	 	27	 
	 
	 	(q)	 	Not A Utility	 	 	27	 
	 
	 	(r)	 	ERISA	 	 	27	 
	 
	 	(s)	 	Intentionally Deleted	 	 	27	 
	 
	 	(t)	 	No Subsidiaries	 	 	27	 
	 
	 	(u)	 	Environmental Matters	 	 	27	 
	 
	 	(v)	 	Liens	 	 	27	 
	 
	 	(w)	 	Solvency	 	 	28	 
	 
	 	(x)	 	Insurance	 	 	28	 
	11.	 	Conditions of Lending	 	 	28	 
	12.	 	Affirmative Covenants	 	 	30	 
	 
	 	(a)	 	Financial Statements and Reports of Borrower, Guarantor	 	 	30	 
	 
	 	(b)	 	Hedging Report	 	 	31	 
	 
	 	(c)	 	Additional Information	 	 	31	 
	 
	 	(d)	 	Certificates of Compliance	 	 	31	 
	 
	 	(e)	 	Taxes and Other Liens	 	 	31	 
	 
	 	(f)	 	Compliance with Laws	 	 	31	 
	 
	 	(g)	 	Further Assurances	 	 	32	 
	 
	 	(h)	 	Performance of Obligations	 	 	32	 
	 
	 	(i)	 	Insurance	 	 	32	 
	 
	 	(j)	 	Accounts and Records	 	 	32	 
	 
	 	(k)	 	Right of Inspection	 	 	32	 
	 
	 	(l)	 	Notice of Certain Events	 	 	33	 
	 
	 	(m)	 	Environmental Reports and Notices	 	 	33	 
	 
	 	(n)	 	Compliance and Maintenance	 	 	33	 
	 
	 	(o)	 	Operation of Properties	 	 	34	 
	 
	 	(p)	 	Compliance with Leases and Other Instruments	 	 	34	 
	 
	 	(q)	 	Certain Additional Assurances Regarding Maintenance and Operations of	 	 	 	 
	 
	 	 	 	Properties	 	 	34	 
	 
	 	(r)	 	Sale of Certain Assets/Prepayment of Proceeds	 	 	35	 
	 
	 	(s)	 	Title Matters	 	 	35	 

ii 

 

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	Page No.	 
	 
	 	(t)	 	Change of Principal Place of Business	 	 	35	 
	 
	 	(u)	 	Additional Collateral	 	 	35	 
	13.	 	Negative Covenants	 	 	36	 
	 
	 	(a)	 	Negative Pledge	 	 	36	 
	 
	 	(b)	 	Current Ratio	 	 	36	 
	 
	 	(c)	 	Consolidations and Mergers	 	 	36	 
	 
	 	(d)	 	Limitation on Additional Indebtedness	 	 	36	 
	 
	 	(e)	 	Restricted Payments	 	 	37	 
	 
	 	(f)	 	Rate Management Transactions	 	 	37	 
	 
	 	(g)	 	Certain Transactions	 	 	38	 
	 
	 	(h)	 	Intentionally Deleted	 	 	38	 
	 
	 	(i)	 	Limitation on Investments and New Businesses	 	 	38	 
	 
	 	(j)	 	Limitation on Credit Extensions	 	 	38	 
	 
	 	(k)	 	Fiscal Year	 	 	38	 
	 
	 	(l)	 	Certain Agreements	 	 	38	 
	 
	 	(m)	 	Lines of Business	 	 	38	 
	14.	 	Events of Default	 	 	38	 
	15.	 	Agent and Lenders	 	 	41	 
	 
	 	(a)	 	Appointment and Authorization	 	 	41	 
	 
	 	(b)	 	Note Holders	 	 	42	 
	 
	 	(c)	 	Consultation with Counsel	 	 	42	 
	 
	 	(d)	 	Documents	 	 	42	 
	 
	 	(e)	 	Resignation or Removal of Agent	 	 	42	 
	 
	 	(f)	 	Responsibility of Agent	 	 	43	 
	 
	 	(g)	 	Independent Investigation	 	 	44	 
	 
	 	(h)	 	Indemnification	 	 	44	 
	 
	 	(i)	 	Benefit of Section 15	 	 	44	 
	 
	 	(j)	 	Pro Rata Treatment	 	 	44	 
	 
	 	(k)	 	Assumption as to Payments	 	 	45	 
	 
	 	(l)	 	Other Financings	 	 	45	 
	 
	 	(m)	 	Interests of Lenders	 	 	45	 
	 
	 	(n)	 	Investments	 	 	45	 
	 
	 	(o)	 	Delegation to Affiliates	 	 	46	 
	 
	 	(p)	 	Execution of Collateral Documents	 	 	46	 
	 
	 	(q)	 	Collateral Releases	 	 	46	 
	16.	 	Exercise of Rights	 	 	46	 
	17.	 	Notices	 	 	46	 
	18.	 	Expenses	 	 	47	 
	19.	 	Indemnity	 	 	47	 
	20.	 	Non-Liability of Lenders	 	 	48	 
	21.	 	Governing Law	 	 	48	 
	22.	 	Invalid Provisions	 	 	48	 
	23.	 	Maximum Interest Rate	 	 	48	 
	24.	 	Amendments	 	 	49	 
	25.	 	Multiple Counterparts	 	 	49	 
	26.	 	Conflict	 	 	50	 

iii 

 

	 	 	 	 	 
	 	 	 	 	Page No.
	27.
	 	Survival	 	50
	28.
	 	Parties Bound	 	50
	29.
	 	Assignments and Participations	 	50
	30.
	 	Choice of Forum: Consent to Service of Process and Jurisdiction	 	52
	31.
	 	Waiver of Jury Trial	 	52
	32.
	 	Other Agreements	 	52
	33.
	 	Financial Terms	 	52
	34.
	 	Tri-Party Loan	 	52
	35.
	 	USA Patriot Act Notice	 	52
	36.
	 	Original Credit Agreement	 	52

	 	 	 	 	 
	Exhibits	 	 	 	 
	Exhibit “A”

	 	-
	 	Form of Notice of Borrowing
	Exhibit “B”

	 	-
	 	Form of Note
	Exhibit “C”

	 	-
	 	Form of Certificate of Compliance
	Exhibit “D”

	 	-
	 	Form of Assignment and Acceptance Agreement

	 	 	 	 	 
	Schedules	 	 	 	 
	Schedule 1

	 	-
	 	Liens
	Schedule 2

	 	-
	 	Financial Condition
	Schedule 2(e)

	 	-
	 	Existing Letters of Credit
	Schedule 3

	 	-
	 	Liabilities
	Schedule 4

	 	-
	 	Litigation
	Schedule 5

	 	-
	 	Subsidiaries
	Schedule 6

	 	-
	 	Environmental Matters

iv 

 

AMENDED AND RESTATED CREDIT AGREEMENT

     THIS AMENDED AND RESTATED CREDIT AGREEMENT (the “Agreement”) executed as of the 15th day of
February, 2007, by and among APPROACH RESOURCES I, LP, a Texas limited partnership (“Borrower”),
and each of the financial institutions which is a party hereto (as evidenced by the signature pages
to this Agreement) or which may from time to time become a party hereto pursuant to the provisions
of Section 29 hereof or any successor or permitted assignee thereof (collectively, “Lenders”, and
individually, “Lender”), and THE FROST NATIONAL BANK, a national banking association (“Frost”), as
Administrative Agent (“Agent”).

W I T N E S S E T H:

     In consideration of the mutual covenants and agreements herein contained, the parties hereby
agree as follows:

     1. Definitions. When used herein the terms “Agent”, “Agreement”, “Borrower”, “Frost”, “Lender” and
“Lenders”, shall have the meanings indicated above. When used herein the following terms shall
have the following meanings:

     Accounting Principles means generally accepted accounting principles in effect from
time to time, applied in a manner consistent with prior periods.

     Advance means a borrowing hereunder (i) made by some or all of Lenders on the same
Borrowing Date, or (ii) converted or continued by Lenders on the same date of conversion or
continuation, consisting, in either case, of the aggregate amount of the several Loans of the same
type and, in the case of Eurodollar Loans, for the same Interest Period.

     Affiliate means any Person which, directly or indirectly, controls, is controlled by
or is under common control with the relevant Person. For the purposes of this definition,
“control” (including, with correlative meanings, the terms “controlled by” and “under common
control with”), as used with respect to any Person, shall mean a member of the board of directors,
a partner or an officer of such Person, or any other Person with possession, directly or
indirectly, of the power to direct or cause the direction of the management and policies of such
Person, through the ownership (of record, as trustee, or by proxy) of voting shares, partnership
interests or voting rights, through a management contract or otherwise. Any Person owning or
controlling directly or indirectly ten percent or more of the voting shares, partnership interests
or voting rights, or other equity interest of another Person shall be deemed to be an Affiliate of
such Person.

     Applicable Rate means, for any day, with respect to any Base Rate Loan or Eurodollar
Loan, or with respect to the Unused Commitment Fees payable hereunder, as the case may be, the
applicable rate per annum set forth below under the caption “Base Rate Margin”, “Eurodollar Margin”
or “Unused Commitment Fee Rate”, as the case may be, based upon the Borrowing Base Usage applicable
on such date:

 1

 

	 	 	 	 	 	 	 
	 	 	 	 	 	 	Unused
	Borrowing Base	 	Eurodollar	 	Base Rate	 	Commitment
	Usage	 	Margin	 	Margin	 	Fee Rate
	3 90%
	 	200 b.p.	 	0 b.p.	 	37.5 b.p.
	 
	 	 	 	 	 	 
	3 75% and < 90%
	 	175 b.p.	 	0 b.p.	 	37.5 b.p.
	 
	 	 	 	 	 	 
	3 50% and < 75%
	 	150 b.p.	 	0 b.p.	 	37.5 b.p.
	 
	 	 	 	 	 	 
	< 50%
	 	125 b.p.	 	0. b.p.	 	37.5 b.p.
	 

Each change in the Applicable Rate 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
change.

     Approach Delaware means Approach Delaware, LLC, a Delaware limited liability company
and the sole limited partner of Borrower.

     Approach Operating means Approach Operating, LLC, a Delaware limited liability company
and the sole general partner of Borrower.

     Approach Resources means Approach Resources Inc., a Delaware corporation and sole
member of Guarantors.

     Assignment and Acceptance means a document substantially in the form of Exhibit “D”
hereto.

     Available Commitment means, at any time, the Commitment then in effect minus the Total
Outstandings.

     Base Rate means, as of any date, a rate of interest per annum equal to the Prime Rate
for such date, plus the Applicable Rate.

     Base Rate Loan means any loan during any period which bears interest based upon the
Base Rate or which would bear interest based upon the Base Rate if the Maximum Rate ceiling was not
in effect at that particular time.

     Borrowing Base means, as of any date, the value assigned by Lenders from time to time
to the Borrowing Base Properties pursuant to Section 7 hereof.

     Borrowing Base Deficiency is used herein as defined in Section 9(b) hereof.

     Borrowing Base Properties means the Oil and Gas Properties.

     Borrowing Date means the date elected by Borrower pursuant to Section 2(b) hereof for

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an Advance on the Loan.

     Business Day means (i) with respect to any borrowing, payment or note selection of
Eurodollar Loans, a day (other than Saturdays or Sundays) on which banks are legally open for
business in Fort Worth, Texas and on which dealings in United States dollars are carried on in the
London interbank market, and (ii) for all other purposes a day (other than Saturdays and Sundays)
on which banks are legally open for business in Fort Worth, Texas.

     Capital Lease means any lease of property, real or personal, which would be
capitalized on a balance sheet of the lessee prepared in accordance with Accounting Principles.

     Change of Control means the acquisition by any Person or group of Persons acting
together, of a direct interest in more than a majority of the voting power of the voting stock of
or membership interests in Borrower, by way of merger or consolidation or otherwise.

     Collateral shall have the meaning assigned in Section 6 hereof.

     Collateral Documents is used collectively to mean this Agreement, all Deeds of Trust,
Mortgages, Security Agreements, Assignments of Production and Financing Statements, the Guaranties
and other documents covering the Oil and Gas Properties and related personal property, equipment,
oil and gas inventory and proceeds of the foregoing and other collateral documents, all such
documents to be in form and substance reasonably satisfactory to Agent.

     Commitment means (A) for all Lenders, the lesser of (i) $100,000,000 or (ii) the
Borrowing Base, as reduced or increased from time to time pursuant to Sections 2 and 7 hereof, and
(B) as to any Lender, its obligation to make Advances hereunder in amounts not exceeding, in the
aggregate, an amount equal to such Lender’s Commitment Percentage times the total Commitment as of
any date. The Commitment of each Lender hereunder shall be adjusted from time to time to reflect
assignments made by such Lender pursuant to Section 29 hereof. Each reduction in the Commitment
shall result in a Pro Rata reduction in each Lender’s Commitment.

     Commitment Percentage means for each Lender the percentage set forth opposite the
Lender’s name on the signature page hereto. The Commitment Percentage of each Lender hereunder
shall be adjusted from time to time to reflect assignments made by such Lender pursuant to Section
29 hereof.

     Current Assets means, as of any date, the current assets which would be reflected on a
balance sheet of Borrower prepared as of such date in accordance with Accounting Principles;
provided that Borrower’s Current Assets shall include the Available Commitment, and Current Assets
shall not include the amount of any non-cash items as a result of the application of Financial
Accounting Standards Board Statement No. 133 and any subsequent amendments thereto or the fair
value of any Rate Management Transaction or any non-hedge derivative contract (whether deemed
effective or non-effective).

     Current Liabilities means, as of any date, the current liabilities which would be
reflected on a balance sheet of Borrower prepared as of such date in accordance with Accounting
Principles, but excluding any liabilities as a result of the application of Financial Accounting
Standards Board Statement No. 133 and any subsequent amendments thereto or the fair value of

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any Rate Management Transaction or any non-hedge derivative contract (whether deemed effective
or non-effective).

     Current Ratio means the ratio of Current Assets to Current Liabilities.

     Dollar or $ means United States dollars.

     Default means all the events specified in Section 14 hereof, regardless of whether
there shall have occurred any passage of time or giving of notice, or both, that would be necessary
in order to constitute such event as an Event of Default.

     Default Rate is used herein as defined in Section 4(e) hereof.

     Effective Date means the date of this Agreement.

     Eligible Assignee means any of (i) a Lender or any Affiliate of a Lender; (ii) a
commercial bank organized under the laws of the United States, or any state thereof, and having a
combined capital and surplus of at least $100,000,000; (iii) a commercial bank organized under the
laws of any other country which is a member of the Organization for Economic Cooperation and
Development, or a political subdivision of any such country, and having a combined capital and
surplus of at least $100,000,000.00, provided that such bank is acting through a branch or agency
located in the United States; and (iv) a Person that is primarily engaged in the business of
commercial lending and that (A) is a subsidiary of a Lender, (B) a subsidiary of a Person of which
a Lender is a subsidiary, or (C) a Person of which a Lender is a subsidiary; provided, however,
that no Affiliate of Borrower shall be an Eligible Assignee.

     Engineered Value is used herein as defined in Section 6 hereof.

     Environmental Certificate shall have the meaning assigned to it in Section 4.2 hereof.

     Environmental Laws means the Comprehensive Environmental Response, Compensation and
Liability Act of 1980, as amended by the Superfund Amendments and Reauthorization Act of 1986, 42
U.S.C.A. §9601, et seq., the Resource Conservation and Recovery Act, as amended by the Hazardous
Solid Waste Amendment of 1984, 42 U.S.C.A. §6901, et seq., the Clean Water Act, 33 U.S.C.A. §1251,
et seq., the Clean Air Act, 42 U.S.C.A. §1251, et seq., the Toxic Substances Control Act, 15
U.S.C.A. §2601, et seq., The Oil Pollution Act of 1990, 33 U.S.G. §2701, et seq., and all other
laws, statutes, codes, acts, ordinances, orders, judgments, decrees, injunctions, rules,
regulations, orders, permits and restrictions of any federal, state, county, municipal and other
governments, departments, commissions, boards, agencies, courts, authorities, officials and
officers, domestic or foreign, relating to in any way the environment, preservation or reclamation
of natural resources, oil pollution, air pollution, water pollution, noise control and/or the
management, release or threatened release, handling, discharge, disposal or recovery of on-site or
off-site asbestos, radioactive materials, spilled or leaked petroleum products, distillates or
fractions and industrial solid waste or “hazardous substances” as defined by 42 U.S.C. § 9601, et
seq., as amended, as each of the foregoing may be amended from time to time.

     Environmental Liability means any claim, demand, obligation, cause of action, order,

 4

 

violation, damage, injury, judgment, penalty or fine, cost of enforcement, cost of remedial
action or any other costs or expense whatsoever, contingent or otherwise, including reasonable
attorneys’ fees and disbursements and any liability for cleanups, costs of environmental
remediation, fines or penalties, resulting from the violation or alleged violation of any
Environmental Law or the release of any substance into the environment which is required to be
remediated by a regulatory agency or governmental authority or the imposition of any Environmental
Lien (as hereinafter defined), which could reasonably be expected to individually or in the
aggregate have a Material Adverse Effect.

     Environmental Lien means a Lien in favor of any court, governmental agency or
instrumentality or any other Person (i) for any Environmental Liability or (ii) for damages arising
from or cost incurred by such court or governmental agency or instrumentality or other person in
response to a release or threatened release of asbestos or “hazardous substance” into the
environment, the imposition of which Lien could reasonably be expected to have a Material Adverse
Effect.

     ERISA means the Employee Retirement Income Security Act of 1974, as amended.

     Eurodollar Base Rate means the offered rate for the period equal to or greater than
the Interest Period for U.S. dollar deposits of not less than $1,000,000 as of 11:00 a.m. City of
London, England time two (2) Business Days prior to the first day of the Interest Period as shown
on the display designated as “British Bankers Association Interest Settlement Rates” on Telerate
for the purpose of displaying such rate. In the event such rate is not available on Telerate, then
such offered rate shall be the comparable rate designated by Reuters or, if such a comparable rate
is not designated by Reuters, such offered rate shall be otherwise independently determined by
Agent from another alternate, substantially independent source available to Agent (such as, but not
limited to, Bloomberg) or shall be calculated by Agent by substantially similar methodology as that
theretofore used to determine such offered rate.

     Eurodollar Loan means any Loan during any period which bears interest at the
Eurodollar Rate, or which would bear interest at such rate if the Maximum Rate ceiling was not in
effect at a particular time.

     Eurodollar Rate means, with respect to a Eurodollar Loan for the relevant Interest
Period, the sum of the quotient of (A) the Eurodollar Base Rate applicable to such Interest Period,
divided by (B) one minus the Reserve Requirement (expressed as a decimal) applicable to such
Interest Period. The Eurodollar Rate shall be rounded to the next higher multiple of 1/100th of
one percent if the rate is not such a multiple.

     Event of Default is used herein as defined in Section 14 hereof.

     Facility Termination Date means the Maturity Date.

     Federal Funds Effective Rate means, for any day, an interest rate per annum equal to
the weighted average of the rates on overnight Federal funds transactions with members of the
Federal Reserve System arranged by Federal funds brokers on such day, as published for such day
(or, if such day is not a Business Day, for the immediately preceding Business Day) by the Federal
Reserve Bank of New York, or, if such rate is not so published for any day which is a

 5

 

Business Day, the average of the quotations at approximately 10:00 a.m. (Fort Worth, Texas
time) on such day on such transactions received by Agent from three (3) Federal funds brokers of
recognized standing selected by Agent in its sole discretion.

     Financial Statements means balance sheets, income statements, statements of cash flow,
stockholder equity and appropriate footnotes and schedules, prepared in accordance with Accounting
Principles.

     Guarantors means Approach Operating and Approach Delaware.

     Indebtedness with respect to Borrower means as of any date, all liabilities and
contingent liabilities which would be reflected on a balance sheet and related notes thereto of
Borrower prepared as of such date in accordance with the Accounting Principles, including without
limitation: (i) all obligations for money borrowed; (ii) all obligations under conditional sale or
other title retention agreements and all obligations issued or assumed as full or partial payment
for property, whether or not any such obligations represent obligations for borrowed money; (iii)
all indebtedness secured by any lien existing on property owned or acquired by Borrower subject to
any such lien, whether or not the obligations secured thereby shall have been assumed but only to
the extent of the value of the property so secured; (iv) the proportionate share of Borrower in all
obligations, direct or indirect, to any joint venture, partnership or other entity of which
Borrower is a member; (v) all obligations under guaranties, note purchase agreements and other
documents having similar effect; (vi) all obligations for accounts payable or trade credit; (vii)
indebtedness of any joint venture, partnership or other Person for which Borrower is directly or
indirectly liable; (viii) all obligations and indebtedness arising under a Hedge and (ix) all
obligations under capital leases, operating leases or any other leases only to the extent such
leases would be treated as indebtedness in accordance with the Accounting Principles.

     Interest Payment Date means the last day of each calendar quarter in the case of Base
Rate Loans and, in the case of Eurodollar Loans, the last day of the applicable Interest Period,
and if such Interest Period is longer than three (3) months, at three (3) month intervals following
the first day of such Interest Period.

     Interest Period means with respect to any Eurodollar Loan (i) initially, the period
commencing on the date such Eurodollar Loan is made and ending one (1), two (2), three (3) or six
(6) months thereafter as selected by Borrower pursuant to Section 4(a)(ii), and (ii) thereafter,
each period commencing on the day following the last day of the next preceding Interest Period
applicable to such Eurodollar Loan and ending one (1), two (2), three (3) or six (6) months
thereafter, as selected by Borrower pursuant to Section 4(a)(ii); provided, however, that (A) if
any Interest Period would otherwise expire on a day which is not a Business Day, such Interest
Period shall expire on the next succeeding Business Day unless the result of such extension would
be to extend such Interest Period into the next calendar month, in which case such Interest Period
shall end on the immediately preceding Business Day, (B) if any Interest Period begins on the last
Business Day of a calendar month (or on a day for which there is no numerically corresponding day
in the calendar month at the end of such Interest Period) such Interest Period shall end on the
last Business Day of a calendar month, and (iii) any Interest Period which would otherwise expire
after the Maturity Date shall end on such Maturity Date.

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     Letters of Credit is used herein as defined in Section 2(c) hereof.

     Lien means any mortgage, deed of trust, pledge, security interest, assignment,
encumbrance or lien (statutory or otherwise) of every kind and character.

     Loan Documents means this Agreement, the Notes, the Collateral Documents and all other
documents executed by Borrower with Agent or Lenders in connection with the transaction described
in this Agreement.

     Loans means the Revolving Loans.

     Material Adverse Effect means a material adverse effect on (i) the assets or
properties, liabilities, financial condition, business or operations of Borrower, (ii) the ability
of Borrower to carry out its businesses as of the date of this Agreement or as proposed at the date
of this Agreement to be conducted, (iii) the ability of Borrower to perform fully and on a timely
basis its obligations under any of the Loan Documents, (iv) the validity or enforceability of any
of the Loan Documents or the rights and remedies of Agent or Lenders thereunder or (v) the
Collateral, the Liens on the Collateral created pursuant to the Loan Documents or the priority of
any such Lien.

     Maturity Date means January 31, 2008.

     Maximum Rate is used herein as defined in Section 23 hereof.

     Notes means the Notes, substantially in the form of Exhibit “B” hereto issued or to be
issued hereunder to each Lender, respectively, to evidence the indebtedness to such Lender arising
by reason of the Advances on the Commitment, together with all modifications, renewals and
extensions thereof or any part thereof.

     Oil and Gas Properties means all oil, gas and mineral properties and interests and
related personal properties, in which Borrower owns an interest.

     Payor is used herein as defined in Section 3(h) hereof.

     Permitted Liens means (i) royalties, overriding royalties, reversionary interests,
production payments and similar burdens; (ii) sales contracts or other arrangements for the sale of
production of oil, gas or associated liquid or gaseous hydrocarbons which would not (when
considered cumulatively with the matters discussed in clause (i) above) deprive Borrower of any
material right in respect of Borrower’s assets or properties (except for rights customarily granted
with respect to such contracts and arrangements); (iii) statutory Liens for taxes or other
assessments that are not yet delinquent (or that, if delinquent, are being contested in good faith
by appropriate proceedings, levy and execution thereon having been stayed and continue to be stayed
and for which Borrower has set aside on its books adequate reserves in accordance with Accounting
Principles); (iv) easements, rights of way, servitudes, permits, surface leases and other rights in
respect to surface operations, pipelines, grazing, logging, canals, ditches, reservoirs or the
like, conditions, covenants and other restrictions, and easements of streets, alleys, highways,
pipelines, telephone lines, power lines, railways and other easements and rights of way on, over or
in respect of Borrower’s assets or properties and that do not individually or in

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the aggregate cause a Material Adverse Effect; (v) materialmen’s, mechanic’s, repairman’s,
employee’s, vendor’s, laborer’s, warehousemen’s, landlord’s, carrier’s, pipeline’s, contractor’s,
sub-contractor’s, operator’s, non-operator’s (arising under operating or joint operating
agreements), and other Liens (including any financing statements filed in respect thereof)
incidental to obligations incurred by Borrower in connection with the construction, maintenance,
development, transportation, processing, storage or operation of Borrower’s assets or properties to
the extent not delinquent (or which, if delinquent, are being contested in good faith by
appropriate proceedings and for which Borrower has set aside on its books adequate reserves in
accordance with Accounting Principles); (vi) all contracts, agreements and instruments, and all
defects and irregularities and other matters affecting Borrower’s assets and properties which were
in existence at the time Borrower’s assets and properties were originally acquired by Borrower and
all routine operational agreements entered into in the ordinary course of business, which
contracts, agreements, instruments, defects, irregularities and other matters and routine
operational agreements are not such as to, individually or in the aggregate, interfere materially
with the operation, value or use of Borrower’s assets and properties, considered in the aggregate;
(vii) Liens in connection with workmen’s compensation, unemployment insurance or other social
security, old age pension or public liability obligations; (viii) legal or equitable encumbrances
deemed to exist by reason of the existence of any litigation or other legal proceeding or arising
out of a judgment or award with respect to which an appeal is being prosecuted in good faith and
levy and execution thereon have been stayed and continue to be stayed; (ix) rights reserved to or
vested in any municipality, governmental, statutory or other public authority to control or
regulate Borrower’s assets and properties in any manner, and all applicable laws, rules and orders
from any governmental authority; (x) landlord’s Liens; (xi) Liens incurred pursuant to the
Collateral Documents and Liens that secure obligations under Rate Management Transactions permitted
pursuant to Section 13(f) hereof; (xii) any inconsequential, insignificant or immaterial Liens
against any of the Oil and Gas Properties which do not interfere with or impair Borrower’s
ownership of, or right or ability to receive proceeds of production from, such property, and which,
singularly or collectively with other inconsequential, insignificant or immaterial Liens, do not
result in a Material Adverse Effect on Borrower; and (xiii) Liens existing at the date of this
Agreement which are identified in Schedule “1” hereto.

     Person means an individual, a corporation, a partnership, an association, a trust or
any other entity or organization, including a government or political subdivision or an agency or
instrumentality thereof.

     Plan means any plan subject to Title IV of ERISA and maintained by Borrower, or any
such plan to which Borrower is required to contribute on behalf of its employees.

     Pre-Approved Contracts means any contracts or agreements entered into in connection
with any Rate Management Transaction which are designed to hedge, provide a price floor for, or
swap crude oil or natural gas or otherwise sell up to 75%, or in the case of Rate Management
Transactions resulting in a floor price per barrel or mcf, not more than 100% of Borrower’s
Projected Production, (with oil and gas calculated separately) for Rate Management Transactions
with Termination Dates of no more than thirty-six (36) months.

     Prime Rate means the rate per annum equal to the Prime Rate announced from time to time by Agent (which is not necessarily the lowest rate charged to any customer), changing when

 8

 

and as said Prime Rate changes.

     Projected Production means the projected production from Borrower’s proved developed
producing Oil and Gas Properties as of the date on which any calculation is made as forecasted in
the most recent engineering report provided to Lenders.

     Pro Rata or Pro Rata Part means for each Lender, (i) for all purposes where no Loan is
outstanding, such Lender’s Commitment Percentage and (ii) otherwise, the proportion which the
portion of the outstanding Loans owed to such Lender bears to the aggregate outstanding Loans owed
to all Lenders at the time in question.

     Rate Management Transaction means (i) any transaction (including an agreement with
respect thereto) now existing or hereafter entered into by Borrower or any Affiliate which is a
rate swap, basis swap, forward rate transaction, commodity swap, commodity option, equity or equity
index swap, equity or equity index option, bond option, interest rate option, forward exchange
transaction, cap transaction, floor transaction, collar transaction, forward transaction, currency
swap transaction, cross-currency rate swap transaction, currency option or any other similar
transaction (including any option with respect to any of these transactions) or any combination
thereof, whether linked to one or more interest rates, foreign currencies, commodity prices, equity
prices or other financial measures and (ii) any swap, collar, floor, cap, futures or other contract
(including sales contracts with known prices) between Borrower and any Person which is intended to
reduce or eliminate the risk of fluctuations in the price of hydrocarbons, including, without
limitation, the purchase or sale of any hydrocarbons for future delivery, any transaction in a
forward contract for the delivery of any hydrocarbons, any physical or spot transaction in any
hydrocarbons, or any transaction involving the purchase or sale of an option on any of the
foregoing.

     Redetermination Date is used herein as defined in Section 7(b) hereof.

     Regulation D means Regulation D of the Board of Governors of the Federal Reserve
System as from time to time in effect and any successor thereto and other regulation or official
interpretation of said Board of Governors relating to reserve requirements applicable to member
banks of the Federal Reserve System.

     Reimbursement Obligations means, at any time, the obligations of Borrower in respect
of all Letters of Credit then outstanding to reimburse amounts paid by any Lender in respect of any
drawing or drawings under a Letter of Credit.

     Release Price is used herein as defined in Section 12(r) hereof.

     Required Lenders means Lenders holding 66-2/3% or more of the Commitments or if one or
more of the Commitments has been terminated, Lenders holding 66-2/3% of the outstanding Loans.

     Required Payment is used herein as defined in Section 3(h) hereof.

     Reserve Requirement means, with respect to any Interest Period, the maximum aggregate
reserve requirement (including all basic, supplemental, marginal and other reserves) which is

 9

 

imposed under Regulation D on Eurocurrency liabilities.

     Revolving Loan or Loans means an Advance or Advances made pursuant to Section 2(a)
hereof.

     Termination Date means, with respect to any Rate Management Transaction, the date of
expiration of that particular Rate Management Transaction.

     Total Outstandings means the total principal balance outstanding on the Notes at any
time plus (ii) the total face amount of all outstanding Letters of Credit, plus (iii) the total
amount of all unpaid Reimbursement Obligations.

     Tranche means a set of Eurodollar Loans made by Lenders at the same time and for the
same Interest Period.

     Unscheduled Redeterminations means a redetermination of the Borrowing Base made at any
time other than on the dates set for the regular semi-annual redetermination of the Borrowing Base
which are made (i) at the request of Borrower (but only once between Redetermination Dates) or (ii)
at the request of Required Lenders (but only once between Redetermination Dates).

     2. Commitments of Lenders.

     (a) Terms of Commitment. On the terms and conditions hereinafter set forth, each
Lender agrees severally to make Advances to Borrower from time to time during the period
beginning on the Effective Date and ending on the Maturity Date in such amounts as Borrower
may request up to an amount not to exceed, in the aggregate principal amount advanced at any
time, its Pro Rata Part of the Available Commitment. Subject to the terms of this
Agreement, Borrower may borrow, repay and reborrow at any time prior to the Maturity Date.
The obligation of Borrower hereunder shall be evidenced by this Agreement and the Notes
issued in connection herewith, said Notes to be as described in Section 3 hereof.
Notwithstanding any other provision of this Agreement, no Advance shall be required to be
made hereunder if any Default or Event of Default (as hereinafter defined) has occurred and
is continuing. Each Advance under the Commitment shall be an aggregate amount of at least
$500,000 or any whole multiples of $100,000 in excess thereof. Irrespective of the face
amount of the Note or Notes, Lenders shall never have the obligation to Advance any amount
or amounts in excess of the Commitment.

     (b) Procedure for Borrowing. Whenever Borrower desires an Advance under the
Commitment, it shall give Agent telegraphic, telex, facsimile or telephonic notice (“Notice
of Borrowing”) of such requested Advance, which in the case of telephonic notice, shall be
promptly confirmed in writing. Each Notice of Borrowing shall be in the form of Exhibit “A”
attached hereto and shall be received by Agent not later than 11:00 a.m. Fort Worth, Texas
time, on (i) the Borrowing Date in the case of the Base Rate Loan, or (ii) three Business
Days prior to any proposed Borrowing Date in the case of Eurodollar Loans. Each Notice of
Borrowing shall specify (i) the Borrowing Date (which shall be a Business Day), (ii) the
principal amount to be borrowed, (iii) the portion of the Advance constituting Base Rate
Loans and/or Eurodollar Loans and (iv) if any portion of the proposed Advance is to
constitute Eurodollar Loans, the initial Interest Period

10

 

selected by Borrower pursuant to Section 4 hereof to be applicable thereto. Upon receipt of
such Notice, Agent shall advise each Lender thereof; provided, that if Lenders have received
at least one (1) day’s notice of such Advance prior to funding of a Base Rate Loan, or at
least three (3) days’ notice of each Advance prior to funding in the case of a Eurodollar
Loan, each Lender shall provide Agent at its office at 777 Main Street, Suite 500, Fort
Worth, Texas, not later than 1:00 p.m., Fort Worth, Texas time, on the Borrowing Date, in
immediately available funds, its Pro Rata share of the requested Advance, but the aggregate
of all such fundings by each Lender shall never exceed such Lender’s Commitment. Not later
than 2:00 p.m., Fort Worth, Texas time, on the Borrowing Date, Agent shall make available to
Borrower at the same office, in like funds, the aggregate amount of such requested Advance.
Neither Agent nor any Lender shall incur any liability to Borrower in acting upon any Notice
of Borrowing referred to above which Agent or such Lender believes in good faith to have
been given by a duly authorized officer or other person authorized to borrow on behalf of
Borrower or for otherwise acting in good faith under this Section 2(b). Upon funding of
Advances by Lenders and such funds being made available to Borrower in accordance with this
Agreement, pursuant to any such Notice, Borrower shall have effected Advances hereunder.

     (c) Letters of Credit. On the terms and conditions hereinafter set forth, Agent
shall from time to time during the period beginning on the Effective Date and ending on the
Maturity Date upon request of Borrower, issue standby and/or commercial Letters of Credit
for the account of Borrower (the “Letters of Credit”) in such face amounts as Borrower may
request, but not to exceed in the aggregate face amount at any time outstanding ten percent
(10%) of the Borrowing Base then in effect. The face amount of all Letters of Credit issued
and outstanding hereunder shall be considered as Advances on the Commitment for Borrowing
Base purposes and all payments made by Agent on such Letters of Credit shall be considered
as Advances under the Notes. Each Letter of Credit issued for the account of Borrower
hereunder shall (i) be in favor of such beneficiaries as specifically requested by Borrower,
(ii) have an expiration date not exceeding the earlier of (a) one year or (b) the Maturity
Date, (iii) be in a minimum amount of $25,000.00 and (iv) contain such other terms and
provisions as may be reasonable required by issuing Lender. Each Lender (other than Agent)
agrees that, upon issuance of any Letter of Credit hereunder, it shall automatically acquire
a participation in Agent’s liability under such Letter of Credit in an amount equal to such
Lender’s Commitment Percentage of such liability, and each Lender (other than Agent) thereby
shall absolutely, unconditionally and irrevocably assume, as primary obligor and not as
surety, and shall be unconditionally obligated to Agent to pay and discharge when due, its
Commitment Percentage of Agent’s liability under such Letter of Credit. Borrower hereby
unconditionally agrees to pay and reimburse Agent for the amount of each demand for payment
under any Letter of Credit that is in substantial compliance with the provisions of any such
Letter of Credit at or prior to the date on which payment is to be made by Agent to the
beneficiary thereunder, without presentment, demand, protest or other formalities of any
kind. Upon receipt from any beneficiary of any Letter of Credit of any demand for payment
under such Letter of Credit, Agent shall promptly notify Borrower of the demand and the date
upon which such payment is to be made by Agent to such beneficiary in respect of such
demand. Upon receipt of such notice from Agent,

11

 

Borrower shall advise Agent whether or not it intends to borrow hereunder to finance its
obligations to reimburse Agent, and if so, submit a Notice of Borrowing as provided in
Section 2(b) hereof. If Borrower fails to so advise Agent and thereafter fails to reimburse
Agent, Agent shall notify each Lender of the demand and the failure of Borrower to reimburse
Agent, and each Lender shall reimburse Agent for its Commitment Percentage of each such draw
paid by Agent and unreimbursed by Borrower. All such amounts paid by Agent and/or
reimbursed by Lenders shall be treated as an Advance or Advances under the Commitment, which
Advances shall be immediately due and payable and shall bear interest at the Maximum Rate.
Borrower agrees to pay Agent for the benefit of Lenders commissions for issuing the Letters
of Credit (calculated separately for each Letter of Credit) in an amount equal to the
greater of (i) $500 or, (ii) one percent (1.00%) of the maximum face amount of the Letter of
Credit. Such commissions will be calculated on the basis of a year consisting of 360 days.

     (d) Procedure for Obtaining Letters of Credit. The amount and date of issuance,
renewal, extension or reissuance of a Letter of Credit pursuant to the Commitments shall be
designated by Borrower’s written request delivered to Agent at least three (3) Business Days
prior to the date of such issuance, renewal, extension or reissuance. Concurrently with or
promptly following the delivery of the request for a Letter of Credit, Borrower shall
execute and deliver to Agent an application and agreement with respect to the Letter of
Credit, said application and agreement to be in the form used by Agent (in the event that
there is any conflict between the terms of any such application and agreement for any Letter
of Credit and this Agreement, the terms of this Agreement shall prevail). Agent shall not
be obligated to issue, renew, extend or reissue any Letter of Credit if (i) the amount
thereon when added to the face amount of the outstanding Letters of Credit plus any
Reimbursement Obligations exceeds ten percent (10%) of the Borrowing Base or (ii) the amount
thereof when added to the Total Outstandings would exceed the Commitment.

     (e) Outstanding Letters of Credit. On the Effective Date, the Letters of Credit
listed on Schedule 2(e) shall be deemed to have been issued under this Agreement by Agent,
without payment of any fees otherwise due upon the issuance of a Letter of Credit, and Agent
shall be deemed, without further action by any party hereto, to have sold to each Lender,
and each Lender shall be deemed, without further action by any party hereto, to have
purchased from Agent, a participation, to the extent of such Lender’s Pro Rata Part, in such
Letters of Credit.

     (f) Voluntary Reduction of Borrowing Base. Subject to the provisions of Section
5(c) hereof, Borrower may at any time, or from time to time, upon not less than three (3)
Business Days’ prior written notice to Agent, reduce the Borrowing Base; provided, however,
that (i) each reduction in the Borrowing Base must be in the amount of $1,000,000 or more,
in increments of $1,000,000 and (ii) each reduction must be accompanied by a prepayment of
the Notes in the amount by which the Total Outstandings exceed the Borrowing Base as reduced
pursuant to this Section 2(f).

     (g) Mandatory Borrowing Base Reductions. The Borrowing Base shall be reduced from
time to time by an amount of any prepayment required by Section 12(r)

12

 

hereof upon the sale of assets. If, as a result of any such reduction in the Borrowing
Base, the Total Outstandings ever exceed the Borrowing Base then in effect, Borrower shall
make the mandatory prepayment of principal required pursuant to Section 9(b) hereof.

     (h) Several Obligations. The obligations of Lenders under the Commitments are
several and not joint. The failure of any Lender to make an Advance required to be made by
it shall not relieve any other Lender of its obligation to make its Advance, and no Lender
shall be responsible for the failure of any other Lender to make the Advance to be made by
such other Lender. No Lender shall be required to lend hereunder any amount in excess of
its legal lending limit.

     (i) Type and Number of Advances. Any Advance on the Commitment may be a Base Rate
Loan or a Eurodollar Loan, or a combination thereof, as selected by Borrower pursuant to
Section 4 hereof. The total number of Tranches which may be outstanding at any time shall
never exceed five (5).

     3. Notes Evidencing Loans. The loans described above in Section 2 shall be evidenced by promissory
notes of Borrower as follows:

     (a) Form of Notes. The Loans shall be evidenced by a Note or Notes in the aggregate
face amount of $100,000,000, and shall be in the form of Exhibit “B” hereto with appropriate
insertions. Notwithstanding the face amount of the Notes, the actual principal amount due
from Borrower to Lenders on account of the Notes, as of any date of computation, shall be
the sum of Advances then and theretofore made on account thereof, less all principal
payments actually received by Lenders in collected funds with respect thereto. Although the
Notes may be dated as of the Effective Date, interest in respect thereof shall be payable
only for the period during which the loans evidenced thereby are outstanding and, although
the stated amount of the Notes may be higher, the Notes shall be enforceable, with respect
to Borrower’s obligation to pay the principal amount thereof, only to the extent of the
unpaid principal amount of the Loans. Irrespective of the face amount of the Notes, no
Lender shall ever be obligated to advance on the Commitment any amount in excess of its
Commitment then in effect.

     (b) Issuance of Additional Notes. At the Effective Date there shall be outstanding
Notes in the aggregate face amount of $100,000,000 payable to the order of Lenders.
From time to time new Notes may be issued to other Lenders as such Lenders become parties to
this Agreement. Upon request from Agent, Borrower shall execute and deliver to Agent any
such new or additional Notes. From time to time as new Notes are issued Agent shall require
that each Lender exchange its Note(s) for newly issued Note(s) to better reflect the extent
of each Lender’s Commitments hereunder.

     (c) Interest Rates. The unpaid principal balance of the Notes shall bear interest
from time to time as set forth in Section 4 hereof.

     (d) Payment of Interest. Interest on the Notes shall be payable on each Interest
Payment Date unless earlier due in whole or in part as a result of an acceleration

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of the amount due as a result of an Event of Default or pursuant to the mandatory prepayment
provisions of Section 9(b) or 9(c) hereof.

     (e) Payment of Principal. Principal of the Loans shall be due and payable to Agent
for the ratable benefit of Lenders on the Maturity Date unless earlier due in whole
or in part as a result of an acceleration of the amount due or pursuant to the mandatory
prepayment provisions of Section 9(b) or 9(c) hereof.

     (f) Payment to Lenders. Each Lender’s Pro Rata Part of payment or prepayment of the
Loans shall be directed by wire transfer to such Lender by Agent at the address provided to
Agent for such Lender for payments no later than 2:00 p.m., Fort Worth, Texas, time on the
Business Day such payments or prepayments are deemed hereunder to have been received by
Agent; provided, however, in the event that any Lender shall have failed to make an Advance
as contemplated under Section 2 hereof (a “Defaulting Lender”) and Agent or another Lender
or Lenders shall have made such Advance, payment received by Agent for the account of such
Defaulting Lender or Lenders shall not be distributed to such Defaulting Lender or Lenders
until such Advance or Advances shall have been repaid in full to Lender or Lenders who
funded such Advance or Advances. Any payment or prepayment received by Agent at any time
after 12:00 noon, Fort Worth, Texas, time on a Business Day shall be deemed to have been
received on the next Business Day. Interest shall cease to accrue on any principal as of
the end of the day preceding the Business Day on which any such payment or prepayment is
deemed hereunder to have been received by Agent. If Agent fails to transfer any principal
amount to any Lender as provided above, then Agent shall promptly direct such principal
amount by wire transfer to such Lender.

     (g) Sharing of Payments, Etc. If any Lender shall obtain any payment (whether
voluntary, involuntary, or otherwise) on account of the Loans (including, without
limitation, any set-off) which is in excess of its Pro Rata Part of payments on the Loans,
as the case may be, obtained by all Lenders, such Lender shall purchase from the other
Lenders such participation as shall be necessary to cause such purchasing Lender to share
the excess payment Pro Rata with each of them; provided that, if all or any portion of such
excess payment is thereafter recovered from such purchasing Lender, the purchase
shall be rescinded and the purchase price restored to the extent of the recovery. Borrower
agrees that any Lender so purchasing a participation from another Lender pursuant to this
Section may, to the fullest extent permitted by law, exercise all of its rights of payment
(including the right of offset) with respect to such participation as fully as if such
Lender were the direct creditor of Borrower in the amount of such participation.

     (h)
Non-Receipt of Funds by Agent. Unless Agent shall have been notified by a Lender or
Borrower (the “Payor”) prior to the date on which such Lender is to make payment to Agent of
the proceeds of a Loan to be made by it hereunder Borrower is to make a payment to Agent for
the account of one or more of Lenders, as the case may be (such payment being herein called
the “Required Payment”), which notice shall be effective upon receipt, that Payor does not
intend to make the Required Payment to Agent, Agent may assume that the Required
Payment has been made and may, in reliance upon such assumption (but shall not be required
to), make the amount thereof available to the intended recipient on such date and, if Payor
has not in fact made the Required

14

 

Payment to Agent, the recipient of such payment shall, on demand, pay to Agent the amount
made available to it together with interest thereon in respect of the period commencing on
the date such amount was made available by Agent until the date Agent recovers such amount
at the rate applicable to such portion of the applicable Loan.

4. Interest Rates.

     (a) Options.

     (i) Base Rate Loans. On all Base Rate Loans Borrower agrees to pay
interest on the Notes calculated on the basis of a year consisting of 365 days or
366 days in a leap year, as the case may be, and for the actual number of days
elapsed with respect to the unpaid principal amount of each Base Rate Loan from the
date the proceeds thereof are made available to Borrower until maturity (whether by
acceleration or otherwise), at a varying rate per annum equal to the lesser of (i)
the Maximum Rate, or (ii) the Base Rate plus the Applicable Rate. Subject to the
provisions of this Agreement as to prepayment, the principal of the Notes
representing Base Rate Loans shall be payable as specified in Section 3(e) hereof
and the interest in respect of each Base Rate Loan shall be payable on each Interest
Payment Date applicable thereto. Past due principal and, to the extent permitted by
law, past due interest in respect to each Base Rate Loan, shall bear interest,
payable on demand, at a rate per annum equal to the Default Rate.

     (ii) Eurodollar Loans. On all Eurodollar Loans Borrower agrees to pay
interest calculated on the basis of a year consisting of 365 days or 366 days in a
leap year, as the case may be, and for the actual number of days elapsed with
respect to the unpaid principal amount of each Eurodollar Loan from the date the
proceeds thereof are made available to Borrower until maturity (whether by
acceleration or otherwise), at a varying rate per annum equal to the lesser of (i)
the Maximum Rate, or (ii) the Eurodollar Rate plus the Applicable Rate. Subject to
the provisions of this Agreement with respect to prepayment, the principal of the
Notes shall be payable as specified in Section 3(e) hereof and the interest with
respect to each Eurodollar Loan shall be payable on each Interest Payment Date
applicable thereto. Past due principal and, to the extent permitted by law, past
due interest shall bear interest, payable on demand, at a rate per annum equal to
the Default Rate. Upon three (3) Business Days’ written notice prior to the making
by Lenders of any Eurodollar Loan (in the case of the initial Interest Period
therefor) or the expiration date of each succeeding Interest Period (in the case of
subsequent Interest Periods therefor), Borrower shall have the option, subject to
compliance by Borrower with all of the provisions of this Agreement, as long as no
Event of Default exists, to specify whether the Interest Period commencing on any
such date shall be a one (1), two (2), three (3) or six (6) month period, subject to
availability. If Agent shall not have received timely notice of a designation of
such Interest Period as herein provided, Borrower shall be deemed to have elected to
convert all then maturing Eurodollar Loans to Base Rate Loans.

15

 

     (b) Interest Rate Determination. Agent shall determine each interest rate
applicable to the Loans hereunder. Agent shall give prompt written notice to Borrower and
Lenders of each rate of interest so determined and its determination thereof shall be
conclusive absent error.

     (c) Conversion Option. Borrower may elect from time to time (i) to convert all or
any part of its Eurodollar Loans to Base Rate Loans by giving Agent irrevocable notice of
such election in writing prior to 10:00 a.m. (Fort Worth, Texas time) on the conversion date
and such conversion shall be made on the requested conversion date, provided that any such
conversion of a Eurodollar Loan shall only be made on the last day of the Interest Period
with respect thereto, and (ii) to convert all or any part of its Base Rate Loans to
Eurodollar Loans by giving Agent irrevocable written notice of such election no later than
three (3) Business Days prior to the proposed conversion and such conversion shall be made
on the requested conversion date or, if such requested conversion date is not a Business
Day, on the next succeeding Business Day. Any such conversion shall not be deemed to be a
prepayment of any of the loans for purposes of this Agreement or the Notes.

     (d) Recoupment. If at any time the applicable rate of interest selected pursuant to
Sections 4(a)(i) or 4(a)(ii) above shall exceed the Maximum Rate, thereby causing the
interest on the Notes to be limited to the Maximum Rate, then any subsequent reduction in
the interest rate so selected or subsequently selected shall not reduce the rate of interest
on the Notes below the Maximum Rate until the total amount of interest accrued on the Notes
equals the amount of interest which would have accrued on the Notes if the rate or rates
selected pursuant to Sections 4(a)(i) or (ii), as the case may be, had at all times been in
effect.

     (e) Interest Rates Applicable After Default. Notwithstanding anything to the
contrary contained in this Section 4, during the continuance of an Event of Default the
Required Lenders may, at their option, by notice from Agent to Borrower (which notice may be
revoked at the option of the Required Lenders notwithstanding the provisions of Section 15
hereof, which requires all Lenders to consent to changes in interest rates) declare that no
Advance may be made as, converted into, or continued as a Eurodollar Loan. During the
continuance of an Event of Default, the Required Lenders, may, at their option, by notice
from Agent to Borrower (which notice may be revoked at the option of Required Lenders
notwithstanding the provisions of Section 15 hereof, which requires all Lenders to consent
to changes in interest rates) declare that (i) each Eurodollar Loan shall bear interest for
the remainder of the applicable Interest Period at the rate otherwise applicable to such
Interest Period plus two percent (2%) per annum and (ii) each Base Rate Loan shall bear
interest at the rate otherwise applicable to such Base Rate Loan plus two percent (2%),
provided that, during the continuance of an Event of Default under Section 14(g) or 14(h),
the interest rate set forth in clauses (i) and (ii) above (the “Default Rate”) shall be
applicable to all outstanding Loans without any election or action on the part of Agent or
any Lender.

     5. Special Provisions Relating to Loans.

16

 

     (a) Unavailability of Funds or Inadequacy of Pricing. In the event that, in
connection with any proposed Eurodollar Loan, Agent reasonably determines, which
determination shall, absent manifest error, be final, conclusive and binding upon all
parties, due to changes in circumstances since the date hereof, adequate and fair means do
not exist for determining the Eurodollar Rate or such rate will not accurately reflect the
costs to Lenders of funding a Eurodollar Loan for such Interest Period, Agent shall give
notice of such determination to Borrower and Lenders, whereupon, until Agent notifies
Borrower and Lenders that the circumstances giving rise to such suspension no longer exist,
the obligations of Lenders to make, continue or convert Loans into Eurodollar Loans shall be
suspended, and all Loans to Borrower shall be Base Rate Loans during the period of
suspension.

     (b) Change in Laws. If at any time hereafter any new law or any change in existing
laws or in the interpretation of any new or existing laws shall make it unlawful for any
Lender to make or continue to maintain or fund Eurodollar Loans hereunder, then such Lender
shall promptly notify Borrower in writing and such Lender’s obligation to make, continue or
convert Loans into Eurodollar Loans under this Agreement shall be suspended until it is no
longer unlawful for such Lender to make or maintain Eurodollar Loans. Upon receipt of such
notice, Borrower shall either repay the outstanding Eurodollar Loans owed to such Lender,
without penalty, on the last day of the current Interest Periods (or, if any Lender may not
lawfully continue to maintain and fund such Eurodollar Loans, immediately), or Borrower may
convert such Eurodollar Loans at such appropriate time to Base Rate Loans.

     (c) Increased Cost or Reduced Return.

     (i) If, after the date hereof, the adoption of any applicable law, rule, or
regulation, or any change in any applicable law, rule, or regulation, or any change
in the interpretation or administration thereof by any governmental authority,
central bank, or comparable agency charged with the interpretation or administration
thereof, or compliance by any Lender with any request or directive (whether or not
having the force of law) of any such governmental authority, central bank, or
comparable agency:

     (A) shall subject such Lender to any tax, duty, or other charge with
respect to any Eurodollar Loans, its Notes, or its obligation to make
Eurodollar Loans, or change the basis of taxation of any amounts payable to
such Lender under this Agreement or its Notes in respect of any Eurodollar
Loan (other than franchise taxes and taxes imposed on or measured by the
overall net income of such Lender);

     (B) shall impose, modify, or deem applicable any reserve, special
deposit, assessment, or similar requirement (other than reserve
requirements, if any, taken into account in the determination of the
Eurodollar Rate) relating to any extensions of credit or other assets of, or
any deposits with or other liabilities or commitments of, such Lender,
including the Commitment of such Lender hereunder; or

17

 

     (C) shall impose on such Lender or on the London interbank market any
other condition affecting this Agreement or its Notes or any of such
extensions of credit or liabilities or commitments;

and the result of any of the foregoing is to increase the cost to such Lender of
making, converting into, continuing, or maintaining any Eurodollar Loan or to reduce
any sum received or receivable by such Lender under this Agreement or its Notes with
respect to any Eurodollar Loan, then Borrower shall pay to such Lender on demand
such amount or amounts as will reasonably compensate such Lender for such increased
cost or reduction. If any Lender requests compensation by Borrower under this
Section 5(c)(i), Borrower may, by notice to such Lender (with a copy to Agent),
suspend the obligation of such Lender to make or continue Eurodollar Loans, or to
convert all or part of the Base Rate Loans owing to such Lender to Eurodollar Loans,
until the event or condition giving rise to such request ceases to be in effect (in
which case the provisions of Section 5(c)(i) shall be applicable); provided that
such suspension shall not affect the right of such Lender to receive the
compensation so requested.

     (ii) If, after the date hereof, any Lender shall have reasonably determined
that the adoption of any applicable law, rule, or regulation regarding capital
adequacy or any change therein or in the interpretation or administration thereof by
any governmental authority, central bank, or comparable agency charged with the
interpretation or administration thereof, or any request or directive regarding
capital adequacy (whether or not having the force of law) of any such governmental
authority, central bank, or comparable agency, has or would have the effect of
reducing the rate of return on the capital of such Lender or any corporation
controlling such Lender as a consequence of such Lender’s obligations hereunder to a
level below that which such Lender or such corporation could have achieved but for
such adoption, change, request, or directive (taking into consideration its policies
with respect to capital adequacy), then from time to time upon demand Borrower shall
pay to such Lender such additional amount or amounts as will reasonably compensate
such Lender for such reduction. If any Lender requests compensation by Borrower
under this Section 5(c)(ii), Borrower may, by notice to such Lender (with a copy to
Agent), suspend the obligation of such Lender to make or continue Eurodollar Loans,
or to convert all or part of the Base Rate Loans owing to such Lender to Eurodollar
Loans, until the event or condition giving rise to such request ceases to be in
effect (in which case the provisions of Section 5(c)(ii) shall be applicable);
provided that such suspension shall not affect the right of such Lender to receive
the compensation so requested.

     (iii) Each Lender shall promptly notify Borrower and Agent of any event of
which it has knowledge, occurring after the date hereof, which will entitle such
Lender to compensation pursuant to this Section 5(c) and will designate a separate
lending office, if applicable, if such designation will avoid the need for, or
reduce the amount of, such compensation and will not, in the judgment of such
Lender, be otherwise disadvantageous to it. Any Lender claiming compensation under
this Section 5(c) shall furnish to Borrower and

18

 

Agent a statement setting forth the additional amount or amounts to be paid to
it hereunder which shall be conclusive in the absence of manifest error. In
determining such amount, such Lender may use any reasonable averaging and
attribution methods.

     (iv) Any Lender giving notice to Borrower through Agent pursuant to this
Section 5(c) shall give to Borrower a statement signed by an officer of such Lender
setting forth in reasonable detail the basis for, and the calculation of such
additional cost, reduced payments or capital requirements, as the case may be, and
the additional amounts required to compensate such Lender therefor.

     (v) Within five (5) Business Days after receipt by Borrower of any notice
referred to in this Section 5(c), Borrower shall pay to Agent for the account of
Lender issuing such notice such additional amounts as are required to compensate
such Lender for the increased cost, reduced payments or increased capital
requirements identified therein, as the case may be.

     (vi) Failure or delay on the part of any Lender to demand compensation pursuant
to this Section shall not constitute a waiver of any such Lender’s right to demand
such compensation.

     (d) Discretion of Lender as to Manner of Funding. Notwithstanding any provisions of
this Agreement to the contrary, each Lender shall be entitled to fund and maintain its
funding of all or any part of its Loan in any manner it sees fit, it being understood,
however, that for the purposes of this Agreement all determinations hereunder shall be made
as if each Lender had actually funded and maintained each Eurodollar Loan through the
purchase of deposits having a maturity corresponding to the last day of the Interest Period
applicable to such Eurodollar Loan and bearing an interest rate at the applicable interest
rate for such Interest Period.

     (e) Breakage Fees. Without duplication under any other provision hereof, if any
Lender incurs any loss, cost or expense including, without limitation, any loss of profit
and loss, cost, expense or premium reasonably incurred by reason of the liquidation or
re-employment of deposits or other funds acquired by such Lender to fund or maintain any
Eurodollar Loan or the relending or reinvesting of such deposits or amounts paid or prepaid
to Lenders as a result of any of the following events other than any such occurrence as a
result in the change of circumstances described in Sections 5(a) and (b):

     (i) any payment, prepayment or conversion of a Eurodollar Loan on a date other
than the last day of its Interest Period (whether by acceleration, prepayment or
otherwise);

     (ii) any failure to make a principal payment of a Eurodollar Loan on the due
date thereof, or

     (iii) any failure by Borrower to borrow, continue, prepay or convert to a
Eurodollar Loan on the dates specified in a notice given pursuant to Section 2(b) or
4(c) hereof;

19

 

then Borrower shall pay to such Lender such amount as will reimburse such Lender for such loss,
cost or expense. If any Lender makes such a claim for compensation, it shall furnish to Borrower
and Agent a statement setting forth the amount of such loss, cost or expense in reasonable detail
(including an explanation of the basis for and the computation of such loss, cost or expense) and
the amounts shown on such statement shall be conclusive and binding absent manifest error.

6. Collateral Security.

     (a) To secure performance by Borrower of its obligations under this Agreement and the
Notes, Borrower shall grant to Agent in its capacity as such Agent under this Agreement for
the ratable benefit of Lenders hereunder, a first priority security interest in and Lien
(and only Lien, except for Permitted Liens) on certain of the Oil and Gas Properties of
Borrower as may be selected by Agent, in its capacity as such Agent under this Agreement,
and the oil, gas and mineral production therefrom or attributable thereto, and in all
operating agreements and oil or gas purchase contracts (now existing or hereafter arising)
relating to such Oil and Gas Properties and in related personal properties, fixtures and
other properties, as evidenced by mortgages, deeds of trust, assignments of production,
security agreements, general security agreements, indentures, and other documents to be
executed by Borrower and delivered to or on behalf of Agent, in its capacity as such Agent
under this Agreement for the ratable benefit of Lenders. Obligations arising from
agreements arising from Rate Management Transactions between Borrower and one or more of
Lenders or an Affiliate of any of Lenders shall be secured by the Collateral covering the
Oil and Gas Properties on a pari passu basis with the indebtedness and obligations of
Borrower under the Loan Documents. Once agreements arising from Rate Management
Transactions involving one or more Lenders, or an Affiliate of any Lender, are entered into,
and pursuant to this provision become secured by the Collateral on a pari passu basis, said
Collateral shall continue to secure such obligations until such agreements are no longer in
force and effect irrespective of whether Lender involved in such agreement ceases to be a
Lender under this Agreement. All Oil and Gas Properties and other collateral in which
Borrower grants or hereafter grants to Agent for the ratable benefit of Lenders, a first and
prior Lien (to the satisfaction of Agent) in accordance with this Section 6, as such
properties and interests are from time to time constituted, are hereinafter collectively
called the “Collateral”.

     (b) The granting and assigning of such security interests and Liens by Borrower shall
be pursuant to Collateral Documents in form and substance reasonably satisfactory to Agent.
Concurrently with the delivery of each of the Collateral Documents or within a reasonable
time thereafter, Borrower shall have furnished or caused to be furnished to Agent mortgage
and title opinions and other title information reasonably satisfactory to Agent with respect
to the title and Lien status of Borrower’s interests in not less than 75% of the Engineered
Value of the mortgaged Borrowing Base Properties. “Engineered Value” for this purpose shall
mean future net revenues discounted at the discount rate being used by Agent as of the date
of any such determination utilizing the pricing parameters used in the engineering report
furnished to Agent pursuant to Sections 7 and 12 hereof. Borrower will cause to be executed
and delivered to Agent, in the future, additional Collateral Documents if Agent reasonably

20

 

deems such are necessary to insure perfection or maintenance of Lenders’ security
interests and Liens in not less than 80% of the Engineered Value of Borrower’s Oil and Gas
Properties which are included in the Borrowing Base then in effect.

     (c) Guarantors shall unconditionally guarantee the Notes pursuant to a guaranty
agreement in form and substance satisfactory to Agent.

7. Borrowing Base.

     (a) Initial Borrowing Base. At the Effective Date, the Borrowing Base shall be
$75,000,000.

     (b) Subsequent Determinations of Borrowing Base. Subsequent determinations of the
Borrowing Base shall be made by Lenders semi-annually on or before March 1 and September 1
of each year beginning September 1, 2007 (each “Redetermination Date”) or as Unscheduled
Redeterminations. No later than August 1 of each year (for the September 1 Redetermination
Date of such year) Borrower shall furnish to Lenders an engineering report in form and
substance reasonably satisfactory to Agent prepared by DeGolyer and MacNaughton or such
other independent petroleum engineering firm acceptable to Agent, said engineering report to
utilize economic and pricing parameters used by Agent as established from time to time,
together with such other information, reports and data concerning the value of Borrowing
Base Properties as Agent shall deem reasonably necessary to determine the value of such
Borrowing Base Properties. The engineering report prepared for the September 1
Redetermination Date shall be prepared as of the preceding July 1 of such year and the
engineering report prepared for the March 1 Redetermination Date shall be prepared as of
January 1 of such year. In addition to the scheduled semi-annual Borrowing Base
Redeterminations, Borrower and Lenders may each request one Unscheduled Redetermination
between Redetermination Dates. By February 1 of each year (for the March 1 Redetermination
Date for such year) beginning February 1, 2008, or within thirty (30) days after either (i)
receipt of notice from Agent that Lenders require an Unscheduled Redetermination, or (ii)
Borrower gives notice to Agent of its desire to have an Unscheduled Redetermination
performed, in each case Borrower shall furnish to Lenders an engineering report prepared by
a petroleum engineer employed by Borrower and updating the most recent engineering report
delivered to Lenders hereunder, in form and substance reasonably satisfactory to Agent, said
engineering report to utilize economic and pricing parameters used by Agent as established
from to time, together with such other information, reports and data concerning the value of
such Borrowing Base Properties. Agent shall by written notice to Borrower within a
reasonable time after each Redetermination Date (the date of such notice being herein called
the “Determination Date”) notify Borrower of the designation by Lenders of the new Borrowing
Base for the period beginning on such Determination Date and continuing until, but not
including, the next Determination Date. If an Unscheduled Redetermination is to be made by
Lenders, Agent shall notify Borrower within a reasonable time after receipt of all requested
information of the new Borrowing Base, and such new Borrowing Base shall continue until the
next Determination Date. If Borrower does not furnish all such information, reports and
data by any date specified in this Section 7(b), unless such failure is of no fault of
Borrower, Lenders nonetheless shall

21

 

designate the Borrowing Base at any amounts which Lenders in their discretion determine and
redesignate the Borrowing Base from time to time thereafter until Lenders receive all such
information, reports and data, whereupon Lenders shall designate a new Borrowing Base as
described above. The procedure for determining the Borrowing Base at each redetermination
shall be that Agent shall determine the Borrowing Base and submit the same to Lenders.
Increases in the Borrowing Base will require approval of all Lenders, but other
reaffirmations or changes in the Borrowing Base will be subject to the approval of Required
Lenders. The failure of any Lender to respond within fifteen (15) days after receipt of the
proposed Borrowing Base shall be deemed to be an approval of the proposed Borrowing Base.
If Required Lenders (or all Lenders in the case of an increase in the Borrowing Base) do not
approve of Agent’s proposed Borrowing Base, Agent shall poll Lenders to determine the
highest Borrowing Base that is acceptable to such Lenders that constitute Required Lenders
(or all Lenders in the case of an increase in the Borrowing Base), and such amount shall
then become the new Borrowing Base. Each Lender shall determine the amount of the Borrowing
Base based upon the loan collateral value which such Lender in its sole discretion (using
such methodology, assumptions and discount rates as such Lender customarily uses in
assigning collateral value to Borrowing Base Properties, oil and gas gathering systems, gas
processing and plant operations) assigns to such Borrowing Base Properties of Borrower at
the time in question and based upon such other credit factors consistently applied
(including, without limitation, the assets, liabilities, cash flow, business, properties,
prospects, management and ownership of Borrower and the effect of Rate Management
Transactions in effect at such time) as such Lender customarily considers in evaluating
similar oil and gas credits. If at any time any of the Borrowing Base Properties are sold,
the Borrowing Base then in effect shall automatically be reduced as required by Section
12(r) hereof. It is expressly understood that Lenders have no obligation to designate the
Borrowing Base at any particular amounts, except in the exercise of their discretion,
whether in relation to the Commitments or otherwise. Provided, however, that Lenders shall
not have the obligation to designate a Borrowing Base in an amount in excess of the
Commitment.

8. Fees.

     (a) Up-Front Fee. Upon execution of this Agreement, Borrower shall pay to Agent for
the ratable benefit of Lenders, a fee of $37,500 (calculated as being 25 b.p. times the
increase in the initial Borrowing Base under this Agreement from the Borrowing Base in
effect under the Original Credit Agreement (defined in Section 36 below) as reasonable
compensation to Lenders for making the Loans available to Borrower.

     (b) Unused Commitment Fee. Borrower shall pay to Agent for the ratable benefit of
Lenders an unused commitment fee (the “Unused Commitment Fee”) equivalent to the Unused
Commitment Fee Rate times the daily average of the sum of the Borrowing Base minus Total
Outstandings. Such Unused Commitment Fee shall be calculated on the basis of a year
consisting of 360 days. The Unused Commitment Fee shall be payable in arrears on the last
day of each calendar quarter beginning March 31, 2007 with the final fee payment due on the
Maturity Date for any period then ending for which the Unused Commitment Fee shall not have
been theretofore paid. In the event the

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Commitment terminates on any date prior to the end of any such quarterly period, Borrower
shall pay to Agent for the ratable benefit of Lenders, on the date of such termination, the
total Unused Commitment Fee due for the period in which such termination occurs. If a date
for payment of the Unused Commitment Fee shall be other than a Business Day such payment
shall be made on the next succeeding Business Day.

9. Prepayments.

     (a) Voluntary Prepayments. Subject to the provisions of Section 5(e) hereof,
Borrower may at any time and from time to time, without penalty or premium, prepay the
Notes, in whole or in part. Each such prepayment shall be made on at least three (3)
Business Days’ notice to Agent in the case of Eurodollar Loan Tranches and without notice in
the case of Base Rate Loans and shall be in a minimum amount of (i) $100,000 or any whole
multiple of $100,000 in excess thereof (or the unpaid balance of the Notes, whichever is
less), for Base Rate Loans, plus accrued interest thereon and (ii) $1,000,000 or any
integral multiple thereof (or the unpaid balance on the Notes, whichever is less) for
Eurodollar Loans, plus accrued interest thereon to the date of prepayment.

     (b) Mandatory Prepayment For Borrowing Base Deficiency. In the event the Total
Outstandings ever exceed the Borrowing Base as determined by Lenders pursuant to Section
7(b) hereof (a “Borrowing Base Deficiency”), Borrower shall, within fifteen (15) days after
written notification from Agent, either (i) by instruments reasonably satisfactory in form
and substance to Agent, provide Agent with collateral with value and quality in amounts
satisfactory to all of Lenders in their discretion in order to increase the Borrowing Base
by an amount at least equal to such excess, (ii) prepay, without premium or penalty, the
principal amount of the Notes in an amount at least equal to such excess plus accrued
interest thereon to the date of prepayment or (iii) commit to make six (6) equal monthly
installment payments in the aggregate amount of the Borrowing Base Deficiency, with the
first such installment being due on or before thirty (30) days after Borrower’s receipt of
Agent’s notice of the Borrowing Base Deficiency.

     10. Representations and Warranties. In order to induce Lenders to enter into this Agreement,
Borrower represents and warrants to Lenders (which representations and warranties will survive the
delivery of the Notes) that:

     (a) Organization and Qualification. Borrower is a limited partnership duly
organized and validly existing under the laws of the State of Texas and has all limited
partnership power and authority required to own its property and carry on its business as
presently conducted and proposed to be conducted. Each Guarantor is duly organized and
validly existing under the laws of the State of Delaware and has all corporate power and
authority required to own its property and carry on its business as presently conducted and
proposed to be conducted. Approach Operating is authorized to do business in the State of
Texas. Borrower has all power and authority to own its properties and assets and to
transact the business in which it is engaged.

     (b) Power and Authority. Borrower has the partnership power and requisite authority
to execute, deliver and perform the necessary Loan Documents, including this

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Agreement; and has taken all partnership action necessary for the due creation and issuance
of the Notes and for the due execution, delivery and performance of the Loan Documents,
including this Agreement. Each Guarantor has the corporate power and requisite authority to
execute, deliver the Loan Documents which it has executed and has taken all company action
necessary to duly authorize (i) the execution, delivery and performance by such Guarantor of
the terms and provisions of the Loan Documents which it has executed and (ii) the
performance by such Guarantor of its obligations under the Loan Documents.

     (c) Binding Obligations. This Agreement does, and the Notes and other Loan
Documents upon their creation, issuance, execution and delivery will, constitute valid and
binding obligations of Borrower enforceable in accordance with its respective terms (except
that enforcement may be subject to general principles of equity and any applicable
bankruptcy, insolvency, or similar debtor relief laws now or hereafter in effect and
relating to or affecting the enforcement of creditors’ rights generally).

     (d) No Legal Bar or Resultant Lien. The Notes and the Loan Documents, including
this Agreement, do not and will not, to the best of Borrower’s and each Guarantor’s
knowledge, violate or conflict with or result in a default under any provisions of
Borrower’s organizational documents or any contract, agreement, law, regulation, order,
injunction, judgment, decree or writ to which Borrower or any Guarantor is subject, or
result in the creation or imposition of any Lien or other encumbrance upon any assets or
properties of Borrower or any Guarantor, other than those contemplated by this Agreement.

     (e) No Consent. The execution, delivery and performance by Borrower of the Notes
and the execution, delivery and performance by Borrower and Guarantors of the other Loan
Documents that each has executed, including this Agreement, does not require the consent or
approval of any other person or entity, including without limitation any regulatory
authority or governmental body of the United States or any state thereof or any political
subdivision of the United States or any state thereof except for consents required for
federal, state and, in some instances, private leases, rights-of-ways and other conveyances
or encumbrances of oil and gas leases all of which shall have been obtained.

     (f) Financial Condition. The Financial Statements of Borrower and Guarantors which
have been delivered to Lenders pursuant to the terms hereof are complete and correct in all
material respects and fully and accurately reflect in all material respects the financial
conditions and the results of the operations of Borrower and Guarantors as of the dates of
such Financial Statements and no change has occurred between such date and the Effective
Date in the condition, financial or otherwise of Borrower or any Guarantor which is
reasonably expected to have a Material Adverse Effect, except as disclosed to Lenders in
Schedule “2” attached hereto.

     (g) Liabilities. Neither Borrower nor any Guarantor has any material liability,
direct or contingent on the Effective Date, except as disclosed to Lenders in the Financial
Statements or on Schedule “3” attached hereto. No unusual or unduly burdensome
restrictions, restraint, or hazard exists by contract, law or governmental regulation or

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otherwise relative to the business, assets or properties of Borrower or any Guarantor which
is reasonably expected to have a Material Adverse Effect or which involve any of the Loan
Documents.

     (h) Litigation. Except as described in the Financial Statements, or as otherwise
disclosed to Lenders in Schedule “4” attached hereto, on the Effective Date there is no
litigation, legal or administrative proceeding, investigation or other action of any nature
pending or, to the knowledge of Borrower, threatened against or affecting Borrower or any
Guarantor which involves the possibility of any judgment or liability not fully covered by
insurance, and which is reasonably expected to have a Material Adverse Effect.

     (i) Taxes; Governmental Charges. Borrower and each Guarantor have filed all tax
returns and reports required to be filed and have paid all taxes, assessments, fees and
other governmental charges levied upon Borrower or any Guarantor or Borrower’s or any
Guarantor’s assets, properties or income which are due and payable, including interest and
penalties, the failure of which to pay could reasonably be expected to have a Material
Adverse Effect, except such as are being contested in good faith by appropriate proceedings
and for which adequate reserves for the payment thereof as required by Accounting Principles
has been provided and levy and execution thereon have been stayed and continue to be stayed.

     (j) Titles, Etc. Borrower has good and defensible title to all of its material
assets, including without limitation, the Oil and Gas Properties, free and clear of all
Liens except Permitted Liens. Borrower is entitled to receive not less than that percentage
of oil, gas and other hydrocarbons produced from the land covered by the leases pertaining
to the Oil and Gas Properties included in the Borrowing Base (after deduction of all
royalties, overriding royalties and other interests payable from or measured by production)
equal to the “net revenue interest” specified in the evaluation of such Oil and Gas
Properties in the most recent engineering and/or reserve report(s) covering such Oil and Gas
Properties which are delivered to Agent hereunder, with the term “net revenue interest”
meaning the proportionate share of the production of oil, gas or other minerals to which
Borrower is entitled after deduction of all royalties, overriding royalties and other
interests payable from or measured by production. Borrower owns the “working interest” in
the Oil and Gas Properties included in the Borrowing Base specified in the evaluation of
such Oil and Gas Properties in the most recent engineering report(s) and/or reserve reports
covering such Oil and Gas Properties which are delivered to Agent hereunder, with the term
“working interest”, as used herein, meaning the right to explore for, drill and produce oil,
gas or other minerals; and Borrower is not obligated to bear more than that percentage of
the cost of all operations conducted on the Oil and Gas Properties equal to the “working
interest” as above described (other than increases to Borrower’s working interest as a
result of non-operator’s electing to not participate in a proposed operation under an
operating agreement). All material oil, gas and mineral leases which constitute a portion
of the Oil and Gas Properties are in full force and effect, and Borrower has not defaulted
on any of its obligations thereunder so as to materially impair the value of such leases in
the aggregate.

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     (k) Defaults. Neither Borrower nor any Guarantor is in default and no event or
circumstance has occurred which, but for the passage of time or the giving of notice, or
both, would constitute a default under any loan or credit agreement, indenture, mortgage,
deed of trust, security agreement or other agreement or instrument to which Borrower or any
Guarantor is a party in any respect that would be reasonably expected to have a Material
Adverse Effect. No Default or Event of Default hereunder has occurred and is continuing.

     (l) Casualties; Taking of Properties. Since the dates of the latest Financial
Statements of Borrower and Guarantors delivered to Lenders, neither the business nor the
assets or properties of Borrower or any Guarantor has been affected (to the extent it is
reasonably expected to cause a Material Adverse Effect), as a result of any fire, explosion,
earthquake, flood, drought, windstorm, accident, strike or other labor disturbance, embargo,
requisition or taking of property or cancellation of contracts, permits or concessions by
any domestic or foreign government or any agency thereof, riot, activities of armed forces
or acts of God or of any public enemy.

     (m) Use of Proceeds; Margin Stock. The proceeds of the Commitment may be used by
Borrower solely for the purposes of (i) refinancing existing indebtedness under the Original
Credit Agreement, (ii) acquisition, exploration and development of Oil and Gas Properties,
including capital expenditures to fund drilling activities on the Oil and Gas Properties,
(iii) working capital; and (iv) other general corporate purposes in the ordinary course of
Borrower’s business. Borrower is not engaged principally or as one of its important
activities in the business of extending credit for the purpose of purchasing or carrying any
“margin stock” as defined in Regulation U of the Board of Governors of the Federal Reserve
System (12 C.F.R. Part 221), or for the purpose of reducing or retiring any indebtedness
which was originally incurred to purchase or carry a margin stock or for any other purpose
which might constitute this transaction a “purpose credit” within the meaning of said
Regulation U.

     Neither Borrower nor any person or entity acting on behalf of Borrower has taken or will take
any action which might cause the loans hereunder or any of the Loan Documents, including this
Agreement, to violate Regulation U or any other regulation of the Board of Governors of the Federal
Reserve System or to violate the Securities Exchange Act of 1934 or any rule or regulation
thereunder, in each case as now in effect or as the same may hereafter be in effect.

     (n) Location of Business and Offices. The principal place of business and chief
executive office of Borrower is located at the address as stated in Section 17 hereof or
such other places or offices for which notice has been provided to Agent according to
Section 13(f).

     (o) Compliance with the Law. To the best of Borrower’s knowledge, Borrower:

     (i) is not in violation of any law, judgment, decree, order, ordinance, or
governmental rule or regulation to which Borrower, or any of its or any Guarantor’s
assets or properties are subject; or

26

 

     (ii) has not failed to obtain any license, permit, franchise or other
governmental authorization necessary to the ownership of any of its assets or
properties or the conduct of its business;

which violation or failure is reasonably expected to have a Material Adverse Effect.

     (p) No Material Misstatements. No information, exhibit or report furnished by
Borrower to Lenders in connection with the negotiation of this Agreement contained any
material misstatement of fact or omitted to state a material fact or any fact necessary to
make the statements contained therein not materially misleading.

     (q) Not A Utility. Neither Borrower nor any Guarantor is a utility subject to
regulation under the laws of the State of Texas as a result of being engaged in the (i)
generation, transmission, or distribution and sale of electric power; (ii) transportation,
distribution and sale through a local distribution system of natural or other gas for
domestic, commercial, industrial, or other use; (iii) provision of telephone or telegraph
service to others; (iv) production, transmission, or distribution and sale of steam or
water; (v) operation of a railroad; or (vi) provision of sewer service to others.

     (r) ERISA. Borrower maintains no employee benefit plan or other plan for employees
of Borrower that are covered by Title IV of ERISA.

     (s) Intentionally Deleted.

     (t) No Subsidiaries. Borrower has neither formed nor acquired any subsidiaries and,
during the term of the Loan, Borrower shall neither form nor acquire any subsidiary unless
at the time such subsidiary is formed or created, such subsidiary shall unconditionally
guarantee the Notes and the obligations of Borrower under this Agreement pursuant to a
guaranty agreement in form and substance satisfactory to Agent.

     (u) Environmental Matters. Except as disclosed on Schedule “6”, as of the Effective
Date Borrower has not (i) received notice or otherwise learned or is otherwise aware of any
Environmental Liability which would be reasonably expected to individually or in the
aggregate have a Material Adverse Effect arising in connection with (A) any non-compliance
with or violation of the requirements of any Environmental Law or (B) the release or
threatened release of any toxic or hazardous waste into the environment, (ii) received
notice or otherwise become aware of any threatened or actual liability in connection with
the release or notice of any threatened release of any toxic or hazardous waste into the
environment which would be reasonably expected to individually or in the aggregate have a
Material Adverse Effect or (iii) received notice or otherwise learned of or otherwise become
aware of any federal or state investigation evaluating whether any remedial action is needed
to respond to a release or threatened release of any toxic or hazardous waste into the
environment for which Borrower is or may be liable which would reasonably be expected to
result in a Material Adverse Effect.

     (v) Liens. Except (i) as disclosed on Schedule “1” hereto and (ii) for Permitted
Liens, the assets and properties of Borrower are free and clear of all liens and

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encumbrances.

     (w) Solvency. Immediately after the consummation of the transactions to occur on
the Effective Date and immediately following the making of each Loan made on the Effective
Date and after giving effect to the application of the proceeds of such Loans, (i) the fair
value of the assets of Borrower will exceed its debts and liabilities, subordinated,
contingent or otherwise; (ii) the present fair saleable value of the property of Borrower
will be greater than the amount that will be required to pay the probable liability of its
debts and other liabilities, subordinated, contingent or otherwise, as such debts and
liabilities become absolute and matured; (iii) Borrower will be able to pay its debts and
liabilities, subordinated, contingent or otherwise, as such debts and liabilities become
absolute and matured; and (iv) Borrower will not have unreasonably small capital with which
to conduct the business in which it is engaged as such business is now conducted and is
proposed to be conducted following the Effective Date.

     (x) Insurance. All insurance reasonably necessary in the ordinary course of
Borrower’s business is maintained by or on behalf of Borrower and all premiums in respect of
such insurance have been paid or will be paid prior to the date such premium payments are
due.

     11. Conditions of Lending.

     (a) The effectiveness of this Agreement, and the obligation to make the initial
Advance under the Commitment shall be subject to satisfaction of the following
conditions precedent:

     (i) Borrower’s Execution and Delivery. Borrower shall have executed
and delivered to Agent the Agreement, the Notes and other required Loan Documents,
all in form and substance satisfactory to Agent;

     (ii) Guaranty. Guarantors shall have executed an unconditional
guaranty agreement of the Notes in form and substance satisfactory to Agent.

     (iii) Partnership Agreement. Borrower shall have delivered to Agent a
true and correct copy of the limited partnership agreement of Borrower, together
with all amendments thereto, certified as being a true and correct copy thereof.

     (iv) Partnership Authority Certificate. Borrower shall have delivered
to Agent a Certificate of Partnership Authority of Borrower, certifying the name,
title and signature of the Person authorized to sign the Loan Documents to which it
is party on behalf of Borrower, duly executed by the partners of Borrower.

     (v) Articles, Bylaws and Regulations. Borrower shall have delivered to
Agent a true and correct copy of its articles of organization, together with all
amendments thereto. Guarantors shall have delivered to Agent a true and correct
copy of each of their regulations and the articles of incorporation and bylaws of
Approach Resources, together with all amendments thereof, and being certified by the
secretary of each Guarantor and Approach Resources as being a true and

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correct copy thereof.

     (vi) Resolutions. Borrower shall have caused to be delivered to Agent
resolutions of the board of directors of Approach Resources and the member of each
Guarantor approving Approach Resources’ and each Guarantor’s execution, delivery and
performance of the Loan Documents to which it is a party, duly adopted by such board
of directors, certified by the secretary or member of Approach Resources and each
Guarantor, as being a true and correct copy of such resolutions and that such
resolutions have not been amended or rescinded and remain in full force and effect.

     (vii) Incumbency Certificate. Agent shall have received a signed
certificate of the secretary or member of Approach Resources and each Guarantor
certifying the name, office and signature of the member or officers of Approach
Resources and each Guarantor authorized to sign the Loan Documents to which it is a
party.

     (viii) Other Certificates. Agent shall have received certificates of
existence and (in the case of Guarantors and Approach Resources only) of good
standing for Borrower, Approach Resources and each Guarantor issued by the Secretary
of State of Texas (in the case of Borrower) and the Secretary of State of Delaware
(in the case of Guarantors and Approach Resources).

     (ix) Mortgage and Title. Agent shall have received the mortgage and
title information required to be delivered by Borrower pursuant to Section 6 of this
Agreement;

     (x) Representation and Warranties. The representations and warranties
of Borrower under this Agreement and the other Loan Documents shall be true and
correct in all material respects as of such date, as if then made (except to the
extent that such representations and warranties related solely to an earlier date);

     (xi) No Event of Default. No Default or Event of Default shall have
occurred and be continuing;

     (xii) Legal Opinions. Agent shall have received from Borrower’s and
each Guarantor’s legal counsel one or more favorable legal opinions in form and
substance reasonably satisfactory to Agent.

     (xiii) Other Documents. Agent shall have received such other
instruments and documents incidental and appropriate to the transaction provided for
herein as Agent or its counsel may reasonably request, and all such documents shall
be in form and substance reasonably satisfactory to Agent; and

     (xiv) Legal Matters Satisfactory. All legal matters incident to the
consummation of the transactions contemplated hereby shall be reasonably
satisfactory to special counsel for Agent retained at the expense of Borrower.

29

 

     (b) The obligation of Lenders to make any Advance or issue any Letter of Credit under
the Commitment (other than the initial Advance) shall be subject to the following additional
conditions precedent that, at the date of making each such Advance or issuing such Letter of
Credit and after giving effect thereto:

     (xv) Representations and Warranties. The representations and
warranties of Borrower under this Agreement and the other Loan Documents are true
and correct in all material respects as of such date, as if then made (except to the
extent that such representations and warranties related solely to an earlier date);
and

     (xvi) No Event of Default. No Default or Event of Default shall have
occurred and be continuing; and

     (xvii) Legal Matters Satisfactory. All legal matters incident to the
consummation of the transactions contemplated hereby shall be reasonably
satisfactory to special counsel for Agent retained at the expense of Borrower; and

     (xviii) Total Outstandings. After giving effect to such Advance or
Letter of Credit, the Total Outstandings do not exceed the Borrowing Base then in
effect.

Each Borrowing Notice shall constitute a representation and warranty by Borrower that the
conditions contained in Sections 11(b)(i) and (ii) have been satisfied.

     12. Affirmative Covenants. A deviation from the provisions of this Section 12 shall not constitute
a Default or an Event of Default under this Agreement if such deviation is expressly consented to
in writing by Required Lenders prior to the date of deviation. Borrower will at all times comply
with the covenants contained in this Section 12 from the date hereof and for so long as the
Commitments are in existence or any amount is owed to Agent or Lenders under this Agreement or the
other Loan Documents.

     (a) Financial Statements and Reports of Borrower, Guarantor. Borrower shall furnish
to Agent: (i) as soon as available, but in any event within ninety (90) days after the end
of each fiscal year of Borrower and each Guarantor, commencing with the fiscal year ending
December 31, 2006, an audited consolidated balance sheet of Borrower and Guarantors prepared
as of the close of such fiscal year and audited consolidated statements of operations,
changes in partners or shareholders/members equity and statements of cash flows of Borrower
and Guarantors for such year, in each case setting forth in comparative form the figures for
the preceding fiscal year, all in reasonable detail and certified by independent certified
public accountants selected by Borrower and approved by Agent; and (ii) within sixty (60)
days after the end of the first three fiscal quarters of each fiscal year of Borrower and
Guarantors, commencing with the fiscal quarter ending March 30, 2007, an unaudited balance
sheet (without footnotes) of Borrower and Guarantors prepared as of the close of such fiscal
quarter and unaudited statements of operations (without footnotes) of Borrower and
Guarantors for such quarter.

30

 

     (b) Hedging Report. Concurrently with the furnishing of the Financial Statements
required in (a) above and in connection with each Borrowing Base redetermination and at any
other time when requested by Agent, Borrower will provide to Agent a hedging report in form
and substance satisfactory to Agent which shall contain, without limitation, the Projected
Production for the latest available calendar quarter with supporting data, a description of
outstanding Rate Management Transactions, including the commodity, effective date,
termination date, notional quantity, applicable price, cap, or floor, and such other details
required by Agent.

     (c) Additional Information. Promptly upon request of Agent from time to time any
additional financial information or other information that the Agent may reasonably request.

     (d) Certificates of Compliance. Concurrently with the furnishing of the Financial Statements pursuant to Subsection 12(a)
hereof for the months coinciding with the end of each fiscal year or quarter, Borrower will
furnish or cause to be furnished to Agent a certificate in the form of Exhibit “C” attached
hereto, signed by the President, Treasurer or Chief Financial Officer of Approach Operating,
as the sole general partner of Borrower, (i) stating that Borrower has fulfilled in all
material respects its obligations under the Notes and the Loan Documents, including this
Agreement, and that all representations and warranties made herein and therein continue
(except to the extent they relate solely to an earlier date) to be true and correct in all
material respects (or specifying the nature of any change), or if a Default has occurred,
specifying the Default and the nature and status thereof, (ii) to the extent requested from
time to time by Agent, specifically affirming compliance of Borrower in all material
respects with any of its representations (except to the extent they relate solely to an
earlier date) or obligations under said instruments; (iii) setting forth the computation, in
reasonable detail as of the end of each period covered by such certificate, of compliance
with Section 13(b); and (iv) containing or accompanied by such financial or other details,
information and material as Agent may reasonably request to evidence such compliance.

     (e) Taxes and Other Liens. Borrower and each Guarantor will pay and discharge
promptly all taxes, assessments and governmental charges or levies imposed upon Borrower and
such Guarantor, or upon the income or any assets or property of such Borrower, as well as
all claims of any kind (including claims for labor, materials, supplies and rent) which, if
unpaid, might become a Lien or other encumbrance upon any or all of the assets or property
of Borrower or any Guarantor and which could reasonably be expected to result in a Material
Adverse Effect; provided, however, that neither Borrower nor any Guarantor shall be required
to pay any such tax, assessment, charge, levy or claim if the amount, applicability or
validity thereof shall currently be contested in good faith by appropriate proceedings
diligently conducted, levy and execution thereon have been stayed and continue to be stayed
and if Borrower or Guarantors shall have set up adequate reserves therefor, if required,
under Accounting Principles.

     (f) Compliance with Laws. Borrower and Guarantors will observe and comply, in all
material respects, with all applicable laws, statutes, codes, acts, ordinances, orders,
judgments, decrees, injunctions, rules, regulations, orders and restrictions relating

31

 

to
environmental standards or controls or to energy regulations of all federal, state, county,
municipal and other governments, departments, commissions, boards, agencies, courts,
authorities, officials and officers, domestic or foreign.

     (g) Further Assurances. Borrower will cure promptly any defects in the creation and
issuance of the Notes and the execution and delivery of the Notes and the Loan Documents,
including this
Agreement. Borrower at its sole expense will promptly execute and deliver to Agent upon its
reasonable request all such other and further documents, agreements and instruments in
compliance with or accomplishment of the covenants and agreements in this Agreement, or to
correct any omissions in the Notes or more fully to state the obligations set out herein.

     (h) Performance of Obligations. Borrower will pay the Notes and other obligations
incurred by it hereunder according to the reading, tenor and effect thereof and hereof; and
Borrower and Guarantors will do and perform every act and discharge all of the obligations
provided to be performed and discharged by Borrower and Guarantors under the Loan Documents,
including this Agreement, at the time or times and in the manner specified.

     (i) Insurance. Borrower now maintains and will continue to maintain insurance with
financially sound and reputable insurers with respect to its assets against such
liabilities, fires, casualties, risks and contingencies and in such types and amounts as is
customary in the case of persons engaged in the same or similar businesses and similarly
situated. Upon request of Agent, Borrower will furnish or cause to be furnished to Agent
from time to time a summary of the respective insurance coverage of Borrower in form and
substance reasonably satisfactory to Agent, and, if requested, will furnish Agent copies of
the applicable policies. Upon demand by Agent any insurance policies covering any such
property shall be endorsed (i) to provide that such policies may not be canceled, reduced or
affected in any manner for any reason without fifteen (15) days prior notice to Agent, (ii)
to provide for insurance against fire, casualty and other hazards normally insured against,
in the amount of the full value (less a reasonable deductible not to exceed amounts
customary in the industry for similarly situated business and properties) of the property
insured, and (iii) to provide for such other matters as Agent may reasonably require.
Borrower shall at all times maintain adequate insurance with respect to all of its other
assets and wells in accordance with prudent business practices.

     (j) Accounts and Records. Borrower and Guarantors will keep proper books, records
and accounts in which full, true and correct entries will be made of all dealings or
transactions in relation to its business and activities, prepared in a manner consistent
with prior years, subject to changes suggested by Borrower’s or Guarantors’ auditors.

     (k) Right of Inspection. Borrower and Guarantors will permit, after reasonable
notice to Borrower and Guarantors, any officer, employee or agent of Agent to examine
Borrower’s and Guarantors’ books, records and accounts, and take copies and extracts
therefrom, all at such reasonable times during normal business hours and as often as Lenders
may
reasonably request. Lenders will keep all Confidential Information (as herein defined)
confidential and will not disclose or reveal the Confidential Information

32

 

or any part
thereof other than (i) as required by law, (ii) to Lenders’, and Lenders’ subsidiaries,
Affiliates, officers, employees, legal counsel and regulatory authorities or advisors to
whom it is necessary to reveal such information for the purpose of effectuating the
agreements and undertakings specified herein or as otherwise required in connection with the
enforcement of Lenders’ and Agent’s rights and remedies under the Notes, this Agreement and
the other Loan Documents and (iii) any assignee of or participant in, or any prospective
assignee of or participant in, any Lender’s rights or obligations under this Agreement. As
used herein, “Confidential Information” means information about Borrower or Guarantors
furnished by Borrower or Guarantors, but does not include information (i) which was publicly
known, or otherwise known to Lenders, at the time of the disclosure, (ii) which subsequently
becomes publicly known through no act or omission by Lenders, or (iii) which otherwise
becomes known to Lenders, other than through disclosure by Borrower and Guarantors.

     (l) Notice of Certain Events. Borrower shall promptly notify Agent if Borrower
learns of the occurrence of (i) any event which constitutes a Default or Event of Default
together with a detailed statement by Borrower of the steps being taken to cure such Default
or Event of Default; (ii) any legal, judicial or regulatory proceedings affecting Borrower
or any Guarantor or any of the assets or properties of Borrower or any Guarantor which, if
adversely determined, could reasonably be expected to have a Material Adverse Effect; (iii)
any dispute between Borrower or any Guarantor and any governmental or regulatory body or any
other Person or entity which, if adversely determined, would reasonably be expected to cause
a Material Adverse Effect; and (iv) any other matter which in Borrower’s reasonable opinion
could have a Material Adverse Effect.

     (m) Environmental Reports and Notices. Borrower will deliver to Agent (i) promptly
upon its becoming available, one copy of each report (other than routine informational
filings) sent by Borrower to any court, governmental agency or instrumentality pursuant to
any Environmental Law, (ii) notice, in writing, promptly upon Borrower’s receipt of notice
or otherwise learning of any claim, demand, action, event, condition, report or
investigation indicating any potential or actual liability arising in connection with (x)
the non-compliance with or violation of the requirements of any Environmental Law which
reasonably could be expected to have a Material Adverse Effect; (y) the release or
threatened release of any hazardous substance, toxic or hazardous waste into the environment
which reasonably could be expected to have a Material Adverse Effect or which release
Borrower would have a duty to report to any court or government agency or instrumentality,
or (iii) the existence of any Environmental Lien on any properties or assets of Borrower and
Borrower shall promptly deliver a copy of any such notice to Agent.

     (n) Compliance and Maintenance. Borrower will, (i) observe and comply in all material respects with all Environmental
Laws; (ii) except as provided in Subsections 12(o) and 12(p) below, maintain the Borrowing
Base Properties and other assets and properties in good and workable condition at all times
and make all repairs, replacements, additions, betterments and improvements to the Borrowing
Base Properties and other assets and properties as are needed and proper so that the
business carried on in

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connection therewith may be conducted properly and efficiently at all
times in the opinion of Borrower, exercised in good faith; (iii) take or cause to be taken
whatever actions are necessary or desirable to prevent an event or condition of default by
any Borrower under the provisions of any gas purchase or sales contract or any other
contract, agreement or lease comprising a part of the Borrowing Base Properties or other
collateral security hereunder which default could reasonably be expected to result in a
Material Adverse Effect; and (iv) furnish Agent upon request evidence reasonably
satisfactory to Agent that there are no Liens, claims or encumbrances on the Borrowing Base
Properties, except Permitted Liens.

     (o) Operation of Properties. Except as provided in Subsections 12(p) and (q) below,
Borrower will operate, or cause to be operated, all Borrowing Base Properties in a careful
and efficient manner in accordance with the practice of the industry and in compliance in
all material respects with all applicable laws, rules, and regulations, and in compliance in
all material respects with all applicable proration and conservation laws of the
jurisdiction in which the properties are situated, and all applicable laws, rules, and
regulations, of every other agency and authority from time to time constituted to regulate
the development and operation of the properties and the production and sale of hydrocarbons
and other minerals therefrom; provided, however, that Borrower shall have the right to
contest in good faith by appropriate proceedings, the applicability or lawfulness of any
such law, rule or regulation and pending such contest may defer compliance therewith, as
long as such deferment shall not subject the properties or any part thereof to foreclosure
or loss.

     (p) Compliance with Leases and Other Instruments. Borrower will pay or cause to be
paid and discharge all rentals, delay rentals, royalties, production payment, and
indebtedness required to be paid by such party (or required to keep unimpaired in all
material respects the rights of such party in Borrowing Base Properties) accruing under, and
perform or cause to be performed in all material respects each and every act, matter, or
thing required of such party by each and all of the assignments, deeds, leases, subleases,
contracts, and agreements in any way relating to such party or any of the Borrowing Base
Properties and do all other things necessary of such party to keep unimpaired in all
material respects the rights of such party thereunder and to prevent the forfeiture thereof
or default thereunder; provided, however, that nothing in this Agreement shall be deemed to
require Borrower to perpetuate or renew any oil and gas lease or other lease by payment of
rental or delay rental or by commencement or continuation of operations nor to prevent
Borrower from abandoning or releasing any oil and gas lease or other lease or well thereon
when, in any of such events, in the opinion of Borrower exercised in good faith, it is not
in the best interest of
Borrower to perpetuate the same.

     (q) Certain Additional Assurances Regarding Maintenance and Operations of
Properties. With respect to those Borrowing Base Properties which are being operated by
operators other than Borrower, Borrower shall not be obligated to perform any undertakings
contemplated by the covenants and agreement contained in Subsections 12(o) or 12(p) hereof
which are performable only by such operators and are beyond the control of Borrower;
however, Borrower agrees to promptly take, or cause to be taken, all

34

 

reasonable actions
available under any operating agreements or otherwise to bring about the performance of any
such material undertakings required to be performed thereunder.

     (r) Sale of Certain Assets/Prepayment of Proceeds. Borrower will immediately pay
over to Agent for the ratable benefit of Lenders as a prepayment of principal on the Notes
and a reduction of the Borrowing Base, an amount equal to 100% of the “Release Price” from
the sale of Borrowing Base Properties, which sale has been approved in advance by Required
Lenders (provided, however, that approval of Required Lenders shall not be required for the
sales of Borrowing Base Properties aggregating an Engineered Value of ten percent (10%) or
less of the Borrowing Base then in effect during any calendar year). The term “Release
Price” means the amount by which the Total Outstandings exceed the Borrowing Base after the
Borrowing Base is reduced as a result of the sale of Borrowing Base Properties. Any such
prepayment of principal on the Notes required by this Section 12(r), shall not be in lieu
of, but shall be in addition to, any mandatory prepayment of principal required to be paid
pursuant to Section 9(b) hereof. The Borrowing Base shall be reduced by the amount equal to
the Engineered Value of the Borrowing Base Properties sold according to the most recent
reserve report provided to Lender (as determined by Agent) and, in addition thereto, upon
the sale of any Borrowing Base Properties that require the prior approval of Required
Lenders, if requested by Required Lenders, the Borrowing Base will be redetermined pursuant
to an Unscheduled Redetermination, which redetermination will be in addition to any other
Unscheduled Redetermination that may be requested by Required Lenders.

     (s) Title Matters. As to any Borrowing Base Properties hereafter mortgaged to
Agent, Borrower will promptly (but in no event more than sixty (60) days following such
mortgaging) furnish, or cause to be furnished to Agent title information reasonably
satisfactory to Agent that is necessary to cause Borrower to be in compliance with its
obligations under Section 12(u) with respect to title information, showing good and
defensible title of Borrower to such Borrowing Base Properties subject only to Permitted
Liens.

     (t) Change of Principal Place of Business. Borrower shall give Agent at least thirty (30) days prior written notice of its intention
to move its principal place of business and executive offices from the address set forth in
Section 17 hereof

     (u) Additional Collateral. Borrower agrees to regularly monitor engineering data
covering all producing oil and gas properties and interests owned or acquired by Borrower on
or after the date hereof and to mortgage or cause to be mortgaged such of the same to Agent
for the ratable benefit of Lenders in substantially the form of the Collateral Documents, as
applicable, to the extent that Lenders shall at all times during the existence of the
Commitment be secured by perfected Liens and security interests covering not less than
eighty percent (80%) of the Engineered Value of the Borrowing Base Properties of Borrower.
In addition, Borrower agrees that in connection with the mortgaging of such additional
Borrowing Base Properties, it shall within a reasonable time thereafter, deliver or cause to
be delivered to Agent such mortgage and title opinions and other title information with
respect to the title and Lien status of such Borrowing Base Properties as may be necessary
to maintain at all times a level of such title

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information (showing good and defensible
title) of not less than seventy-five percent (75%) of the Engineered Value of all Borrowing
Base Properties mortgaged to Agent for the ratable benefit of Lenders.

     13. Negative Covenants. A deviation from the provisions of this Section 13 shall not constitute an
Event of Default under this Agreement if such deviation is consented to in writing by Required
Lenders prior to the date of deviation. Borrower will at all times comply with the covenants
contained in this Section 13 from the date hereof and for so long as the Commitment is in existence
or any amount is owed to Agent or Lenders under this Agreement or the other Loan Documents.

     (a) Negative Pledge. Borrower shall not, without the prior written consent of
Required Lenders:

     (i) create, incur, assume or permit to exist any Lien, security interest or
other encumbrance on any of its assets or properties except Permitted Liens; or

     (ii) during any annual period, sell, convey, exchange, lease or otherwise
dispose of during any annual period any of its Oil and Gas Properties having an
aggregate value as determined in the most recent engineering report delivered to
Agent under Section 7(b) hereof in excess of ten percent (10%) of the Borrowing
Base, excluding (i) obsolete or worn-out equipment and (ii) oil, gas and
hydrocarbons sold in the ordinary course of Borrower’s business and (iii) Oil and
Gas Properties that have been given no Engineered Value in the Borrowing Base then
in effect. After a Borrowing Base has been determined, upon the sale of any oil and
gas properties, the Borrowing Base shall be reduced, effective on the date of
consummation of such sale, by an amount which the Required Lenders determine is the
Borrowing Base value last assigned to such oil and gas properties
according to the most recent reserve report or update thereof delivered to
Agent. Agent shall provide Borrower with written notice of the redetermined
Borrowing Base made in accordance with this Section 13(a)(ii), which written notice
shall be sufficient to give effect to such redetermined Borrowing Base without
further amendment to this Agreement.

     (b) Current Ratio. Borrower will not allow the Current Ratio of Borrower to at any
time be less than 1.0 to 1.0.

     (c) Consolidations and Mergers. Borrower will not consolidate or merge with or into
any other Person if Borrower is not the surviving entity or, if Borrower is the surviving
entity, such merger or consolidation would cause an Event of Default to occur, or permit any
other Person to consolidate with or merge into it if Borrower is not the surviving entity
or, if Borrower is the surviving entity, such merger or consolidation would cause an Event
of Default to occur or transfer all, or substantially all, of its property.

     (d) Limitation on Additional Indebtedness. Borrower will not incur, create, assume
or in any manner become or be liable in respect of any indebtedness, nor will any

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Borrower
guarantee or otherwise in any manner become or be liable in respect of any indebtedness,
liabilities or other obligations of any other person or entity, whether by agreement to
purchase the indebtedness of any other person or entity or agreement for the furnishing of
funds to any other person or entity through the purchase or lease of goods, supplies or
services (or by way of stock purchase, capital contribution, advance or loan) for the
purpose of paying or discharging the indebtedness of any other person or entity, or
otherwise, except that the foregoing restrictions shall not apply to:

     (i) the Notes and Letters of Credit, and any renewal or increase thereof, or
other indebtedness of Borrower outstanding at the Effective Date which has
heretofore disclosed to Lenders in Borrower’s Financial Statements or on Schedule
“4” hereto; or

     (ii) taxes, assessments or other government charges which are not yet due or
are being contested in good faith by appropriate action promptly initiated and
diligently conducted, if such reserve as shall be required by Accounting Principles
shall have been made therefor and levy and execution thereon have been stayed and
continue to be stayed; or

     (iii) indebtedness (other than in connection with a loan or lending
transaction) incurred in the ordinary course of business, including, but not limited
to indebtedness for drilling, completing, leasing and reworking oil and gas wells;
or

     (iv) obligations under permitted Rate Management Transactions; or

     (v) such other indebtedness not to exceed $1,000,000; or

     (vi) trade payables and other accrued liabilities that are incurred in the
ordinary course of business; and

     (vii) any renewals or extensions of (but, other than in the case of the Notes,
not increases in) any of the foregoing.

     (e) Restricted Payments. Borrower will not declare or pay any cash dividend or
distribution (whether in cash, securities or other property) purchase, redeem or otherwise
acquire for value any of its stock interest now or hereafter outstanding, return any capital
to its stockholders or make any distribution of its assets to its stockholders as such,
except that, if no Event of Default has occurred and is continuing, Borrower may distribute
to its shareholders an amount equal annually to their tax liability incurred as a result of
their ownership interest in Borrower.

     (f) Rate Management Transactions. Borrower will not enter into any Rate Management
Transaction, except the foregoing prohibition shall not apply to (i) transactions consented
to in writing by the Required Lenders which are on terms acceptable to the Required Lenders,
or (ii) Pre-Approved Contracts. Once Borrower enters into a Rate Management Transaction,
the terms and conditions of such Rate Management Transaction may not be materially amended
or modified, nor may such Rate

37

 

Management Transaction be cancelled without Borrower having
given Agent written notice of such amendment, modification or cancellation on the date not
later than three (3) Business Days after the date such action takes place. Borrower further
agrees to give Agent written notice of any bankruptcy, insolvency or similar proceeding
commenced by or against any counterparty to any agreement entered into any such Rate
Management Transaction.

     (g) Certain Transactions. With respect to its Oil and Gas Properties, Borrower
shall not enter into any transaction with any Affiliate except for transactions with
Affiliates upon terms not less favorable to Borrower than would be obtainable at the time in
comparable transactions of Borrower in arm’s length dealings with Persons other than
Affiliates.

     (h) Intentionally Deleted.

     (i) Limitation on Investments and New Businesses. Borrower shall not engage
directly or indirectly in any new business or make any acquisitions, investments, or
commitments, except such businesses, operations,
acquisitions, or investments which are incidental to or reasonably related to the present
businesses and operations conducted by Borrower and except (i) investment in obligations of
the United States government or any agency thereof or obligations guaranteed by the United
States government having a maturity not in excess of one year, (ii) investments in
certificates of deposit of financially sound commercial Bank having a maturity not in excess
of one year, (iii) investments in commercial paper with a rating of at least “Prime 1”
according to Moody’s Investors Service, Inc., or a similar rating of a comparable or
successor service, having a maturity not in excess of one year.

     (j) Limitation on Credit Extensions. Borrower shall not extend credit, make
advances or make loans to any Person or entity other than normal and prudent extensions of
credit in the ordinary course of business.

     (k) Fiscal Year. Borrower shall not change its fiscal year.

     (l) Certain Agreements. Neither Borrower nor any Guarantor shall enter into any
agreement, which by its terms would expressly restrict its performance of its obligations
pursuant to this Loan Agreement or the other Loan Documents.

     (m) Lines of Business. Borrower shall not directly or indirectly engage in any
business other than the acquisition, exploration, development, operation, management or
resale of oil, gas and energy properties and the processing, gathering, marketing and
transportation of production therefrom.

     14. Events of Default. Any one or more of the following events shall be considered an “Event of
Default” as that term is used herein:

     (a) Borrower shall fail to pay when due or declared due the principal of the Notes or
any Reimbursement Obligations with respect to any Letter of Credit, including

38

 

any payment of
principal required under Section 9(b), and such failure to pay shall continue unremedied for
a period of one (1) day; or

     (b) Borrower shall fail to pay when due accrued interest on any of the Notes or any
fees or other amounts payable hereunder or under any other Loan Document and such failure to
pay shall continue unremedied for a period of three (3) days; or

     (c) Any representation or warranty made by Borrower under this Agreement, or in any
certificate or statement furnished or made to Lenders pursuant hereto, or in
connection herewith, or in connection with any document furnished hereunder, shall
prove to be untrue in any material respect as of the date on which such representation or
warranty is made (or deemed made), or any representation, statement (including financial
statements), certificate, report or other data furnished or to be furnished or made by
Borrower under any Loan Document, including this Agreement, proves to have been untrue in
any material respect; or

     (d) Default shall be made in the due observance or performance of any of the covenants
or agreements of Borrower contained in the Loan Documents, including this Agreement
(excluding covenants contained in Section 13 of the Agreement for which there is no cure
period), and such default shall continue for more than thirty (30) days after written notice
from Agent is received by Borrower; or

     (e) Default shall be made in the due observance or performance of the covenants of
Borrower contained in Section 13 of this Agreement; or

     (f) Default shall be made in respect of any obligation for borrowed money in excess of
$500,000 other than the Notes, for which Borrower is liable (directly, by assumption, as
guarantor or otherwise), or any obligations secured by any mortgage, pledge or other
consensual security interest with respect thereto, on any asset or property of Borrower or
in respect of any agreement relating to any such obligations, and if such default shall
continue beyond the applicable grace period, if any; or

     (g) Borrower or any Guarantor shall commence a voluntary case or other proceeding
seeking liquidation, reorganization or other relief with respect to its debts under any
bankruptcy, insolvency or other similar law now or hereafter in effect or seeking an
appointment of a trustee, receiver, liquidator, custodian or other similar official of it or
any substantial part of its property, or shall consent to any such relief or to the
appointment of or taking possession by any such official in an involuntary case or other
proceeding commenced against it, or shall make a general assignment for the benefit of
creditors, or shall fail generally to pay its debts as they become due, or shall take any
corporate action authorizing the foregoing; or

     (h) An involuntary case or other proceeding, shall be commenced against Borrower or any
Guarantor seeking liquidation, reorganization or other relief with respect to its debts
under any bankruptcy, insolvency or similar law now or hereafter in effect or seeking the
appointment of a trustee, receiver, liquidator, custodian or other similar official of it or
any substantial part of its property, and such involuntary case or other

39

 

proceeding shall
remain undismissed and unstayed for a period of sixty (60) days; or an order for relief
shall be entered against Borrower or any Guarantor under the federal bankruptcy laws as now
or hereinafter in effect; or

     (i) A final judgment or order for the payment of money in excess of $500,000 (or
judgments or orders aggregating in excess of $500,000) shall be rendered against Borrower
and such judgments or orders shall continue unsatisfied and unstayed for a period of thirty
(30) days; provided, however, that if any such judgment order is not satisfied or stayed
within such 30-day period an Event of Default shall not exist if prior to
the end of such 30-day period Borrower provides to Agent an unqualified statement from
Borrower’s insurance carrier addressed to Agent that the entire amount of such judgment or
order is a covered loss under the insurance policies that Borrower maintains with such
insurance carrier and that such insurance carrier does not dispute such insurance coverage
and will provide Borrower with such proceeds of insurance required to satisfy such judgment
or order; or

     (j) Borrower shall fail to pay any obligation owed under any Rate Management
Transaction in an amount in excess of $500,000 or in any amount if the obligations of
Borrower under any such Rate Management Transaction are secured by the Collateral Documents
or any event of default (as defined therein) shall occur as a result of the action or
inaction of Borrower under any agreement entered into in connection with any Rate Management
Transaction; or

     (k) The Liens securing the Loans cease to be in place and/or effective (other than as a
result of Agent’s actions or inactions); or

     (l) A Change of Control shall occur; or

     (m) The dissolution of Borrower or any Guarantor.

     Upon occurrence of any Event of Default specified in Subsections 14(g) and (h) hereof, the
entire principal amount due under the Notes and all interest then accrued thereon, and any other
liabilities of Borrower hereunder, shall become automatically and immediately due and payable all
without notice and without presentment, demand, protest, notice of protest or dishonor or any other
notice of default of any kind, all of which are hereby expressly waived by Borrower. Upon the
occurrence of any other Event of Default, Agent, upon request of Required Lenders, shall by written
notice to Borrower terminate the Commitment and declare the principal of, and all interest then
accrued on, the Notes and any other liabilities hereunder to be forthwith due and payable,
whereupon the same shall forthwith become due and payable without presentment, demand, protest,
notice of intent to accelerate, notice of acceleration or other notice of any kind, all of which
Borrower hereby expressly waives, anything contained herein or in the Notes to the contrary
notwithstanding.

     Upon the occurrence and during the continuance of any Event of Default, Lenders are hereby
authorized at any time and from time to time, without notice to Borrower (any such notice being
expressly waived by Borrower), to set-off and apply any and all deposits (general or special, time
or demand, provisional or final) at any time held and other indebtedness at any time

40

 

owing by any Lender to or for the credit or the account of Borrower against any and all of the indebtedness of
Borrower under the Notes and the Loan Documents, including this Agreement, irrespective of whether
or not Lenders shall have made any demand under the Loan Documents, including this Agreement or the
Notes and although such indebtedness may be unmatured. Any amount set-off by any Lender shall be
applied against the indebtedness owed Lenders by Borrower pursuant to this Agreement and the Notes.
Lenders agree promptly to notify Borrower after any such setoff and application, provided that the
failure to give such notice shall not affect the validity of such set-off and application. The
rights of Lenders under this Section are in addition to other rights and remedies (including,
without limitation, other rights of set-off) which Lenders may have.

     15. Agent and Lenders.

     (a) Appointment and Authorization. Each Lender hereby appoints Agent as its nominee
and agent, in its name and on its behalf: (i) to act as nominee for and on behalf of such
Lender in and under all Loan Documents; (ii) to arrange the means whereby the funds of
Lenders are to be made available to Borrower under the Loan Documents; (iii) to take such
action as may be requested by any Lender under the Loan Documents (when such Lender is
entitled to make such request under the Loan Documents); (iv) to receive all documents and
items to be furnished to Lenders under the Loan Documents; (v) to be the secured party,
mortgagee, beneficiary, and similar party in respect of, and to receive, as the case may be,
any collateral for the benefit of Lenders; (vi) to promptly distribute to each Lender all
material information, requests, documents and items received from Borrower under the Loan
Documents; (vii) to promptly distribute to each Lender such Lender’s Pro Rata Part of each
payment or prepayment (whether voluntary, as proceeds of insurance thereon, or otherwise) in
accordance with the terms of the Loan Documents and (viii) to deliver to the appropriate
Persons requests, demands, approvals and consents received from Lenders. Each Lender hereby
authorizes Agent to take all actions and to exercise such powers under the Loan Documents as
are specifically delegated to Agent by the terms hereof or thereof, together with all other
powers reasonably incidental thereto. With respect to its Commitment hereunder and the
Notes issued to it, Agent and any successor Agent shall have the same rights under the Loan
Documents as any other Lender and may exercise the same as though it were not Agent; and the
term “Lender” or “Lenders” shall, unless otherwise expressly indicated, include Agent and
any successor Agent in its capacity as a Lender. Agent and any successor Agent and its
Affiliates may accept deposits from, lend money to, act as trustee under indentures of and
generally engage in any kind of business with Borrower, and any person which may do business
with Borrower, all as if Agent and any successor Agent was not Agent hereunder and without
any duty to account therefor to Lenders; provided that, if any payments in respect of any
property (or the proceeds thereof) now or hereafter in the possession or control of Agent
which may be or become security for the obligations of Borrower arising under the Loan
Documents by reason of the general description of indebtedness secured or of property
contained in any other agreements, documents or instruments related to any such other
business shall be applied to reduction of the obligations of Borrower arising under the Loan
Documents, then each Lender shall be entitled to share in such application according to its
Pro Rata Part thereof. Each Lender, upon request of any other Lender, shall disclose to all
other Lenders all

41

 

indebtedness and liabilities, direct and contingent, of Borrower to such
Lender as of the time of such request.

     (b) Note Holders. From time to time as other Lenders become a party to this
Agreement, Agent shall obtain execution by Borrower of additional Notes in amounts
representing the Commitments of each such new Lender, up to an aggregate face amount of all
Notes not exceeding $100,000,000. The obligation of such Lender shall be governed by the provisions
of this Agreement, including but not limited to, the obligations specified in Section 2
hereof. From time to time, Agent may require that Lenders exchange their Notes for newly
issued Notes to better reflect the Commitments of Lenders. Agent may treat the payee of any
Note as the holder thereof until written notice of transfer has been filed with it, signed
by such payee and in form satisfactory to Agent.

     (c) Consultation with Counsel. Lenders agree that Agent may consult with legal
counsel selected by Agent and shall not be liable for any action taken or suffered in good
faith by it in accordance with the advice of such counsel. LENDERS ACKNOWLEDGE THAT MURPHY
MAHON KEFFLER & FARRIER, L.L.P. IS COUNSEL FOR FROST, BOTH AS AGENT AND AS A LENDER, AND
THAT SUCH FIRM DOES NOT REPRESENT ANY OF THE OTHER LENDERS IN CONNECTION WITH THIS
TRANSACTION.

     (d) Documents. Agent shall not be under a duty to examine or pass upon the
validity, effectiveness, enforceability, genuineness or value of any of the Loan Documents
or any other instrument or document furnished pursuant thereto or in connection therewith,
and Agent shall be entitled to assume that the same are valid, effective, enforceable and
genuine and what they purport to be.

     (e) Resignation or Removal of Agent. Subject to the appointment and acceptance of a
successor Agent as provided below, Agent may resign at any time by giving written notice
thereof to Lenders and Borrower, and Agent may be removed at any time with or without cause
by Required Lenders (excluding Agent). If no successor Agent has been so appointed by
Required Lenders (and approved by Borrower) and has accepted such appointment within thirty
(30) days after the retiring Agent’s giving of notice of resignation or removal of the
retiring Agent, then the retiring Agent may, on behalf of Lenders, appoint a successor
Agent. Any successor Agent must be approved by Borrower, which approval will not be
unreasonably withheld. Upon the acceptance of any appointment as Agent hereunder by a
successor Agent, such successor Agent shall thereupon succeed to and become vested with all
the rights and duties of the retiring Agent, and the retiring Agent, as the case may be,
shall be discharged from its duties and obligations hereunder. After any retiring Agent’s
resignation or removal hereunder as Agent, the provisions of this Section 15 shall continue
in effect for its benefit in respect to any actions taken or omitted to be taken by it while
it was acting as Agent. To be eligible to be an Agent hereunder the party serving, or to
serve, in such capacity must own a Pro Rata Part of the Commitments equal to the level of
Commitment required to be held by any Lender pursuant to Section 29 hereof.

42

 

     (f) Responsibility of Agent. It is expressly understood and agreed that the obligations of Agent under the Loan
Documents are only those expressly set forth in the Loan Documents as to each and that Agent
shall be entitled to assume that no Default or Event of Default has occurred and is
continuing, unless Agent has actual knowledge of such fact or has received notice from a
Lender or Borrower that such Lender or Borrower considers that a Default or an Event of
Default has occurred and is continuing and specifying the nature thereof. Neither Agent nor
any of its directors, officers, attorneys or employees shall be liable for any action taken
or omitted to be taken by them under or in connection with the Loan Documents, except for
its or their own gross negligence or willful misconduct. Agent shall not incur liability
under or in respect of any of the Loan Documents by acting upon any notice, consent,
certificate, warranty or other paper or instrument believed by it to be genuine or authentic
or to be signed by the proper party or parties, or with respect to anything which it may do
or refrain from doing in the reasonable exercise of its judgment, or which may seem to it to
be necessary or desirable.

     Agent shall not be responsible to Lenders for any of Borrower’s recitals, statements,
representations or warranties contained in any of the Loan Documents, or in any certificate or
other document referred to or provided for in, or received by any Lender under, the Loan Documents,
or for the value, validity, effectiveness, genuineness, enforceability or sufficiency of any of the
Loan Documents or for any failure by Borrower to perform any of its obligations hereunder or
thereunder. Agent may employ agents and attorneys-in-fact and shall not be answerable, except as
to money or securities received by it or its authorized agents, for the negligence or misconduct of
any such agents or attorneys-in-fact selected by it with reasonable care.

     The relationship between Agent and each Lender is only that of agent and principal and has no
fiduciary aspects. Nothing in the Loan Documents or elsewhere shall be construed to impose on
Agent any duties or responsibilities other than those for which express provision is therein made.
In performing its duties and functions hereunder, Agent does not assume and shall not be deemed to
have assumed, and hereby expressly disclaims, any obligation or responsibility toward or any
relationship of agency or trust with or for Borrower or any of its beneficiaries or other
creditors. As to any matters not expressly provided for by the Loan Documents, Agent shall not be
required to exercise any discretion or take any action, but shall be required to act or to refrain
from acting (and shall be fully protected in so acting or refraining from acting) upon the
instructions of all Lenders and such instructions shall be binding upon all Lenders and all holders
of the Notes; provided, however, that Agent shall not be required to take any action which is
contrary to the Loan Documents or applicable law.

     Agent shall have the right to exercise or refrain from exercising, without notice or liability
to Lenders, any and all rights afforded to Agent by the Loan Documents or which Agent may have as a
matter of law; provided, however, Agent shall not (i) except as provided herein and in Section 7(b)
hereof, without the consent of Required Lenders approve the sale, release or substitution of
Collateral other than the sale of Collateral permitted pursuant to Section 13(a)(ii) hereof, or
(ii) without the consent of Required Lenders, take any other action with regard to amending the
Loan Documents, waiving any Default under the Loan Documents, or taking any other action with
respect to the Loan Documents. Agent shall not have liability to Lenders for failure or delay in
exercising any right or power possessed by Agent pursuant to the Loan

43

 

Documents or otherwise unless such failure or delay is caused by the gross negligence of
Agent, in which case only Agent responsible for such gross negligence shall have liability therefor
to Lenders.

     (g) Independent Investigation. Each Lender severally represents and warrants to
Agent that it has made its own independent investigation and assessment of the financial
condition and affairs of Borrower in connection with the making and continuation of its
participation hereunder and has not relied exclusively on any information provided to such
Lender by Agent in connection herewith, and each Lender represents, warrants and undertakes
to Agent that it shall continue to make its own independent appraisal of the
creditworthiness of Borrower while the Notes are outstanding or its commitments hereunder
are in force. Agent shall not be required to keep itself informed as to the performance or
observance by Borrower of this Agreement or any other document referred to or provided for
herein or to inspect the properties or books of Borrower. Other than as provided in this
Agreement, Agent shall not have any duty, responsibility or liability to provide any Lender
with any credit or other information concerning the affairs, financial condition or business
of Borrower which may come into the possession of Agent.

     (h) Indemnification. Lenders agree to indemnify Agent, its Affiliates, its
directors, officers, attorneys and employees (the “Indemnified Agents”), from and against
any and all liabilities, obligations, losses, damages, penalties, actions, judgments, suits,
costs, expenses or disbursements of any proper and reasonable kind or nature whatsoever
which may be imposed on, incurred by or asserted against Agent in any way relating to or
arising out of the Loan Documents or any action taken or omitted by any Indemnified Agent
under the Loan Documents, provided that no Lender shall be liable for any portion of such
liabilities, obligations, losses, damages, penalties, actions, judgments, suits, costs,
expenses or disbursements resulting from any Indemnified Agent’s gross negligence or willful
misconduct. Each Lender shall be entitled to be reimbursed by any such Indemnified Agent
for any amount such Lender paid to such Indemnified Agent under this Section 15(h) to the
extent such Indemnified Agent has been reimbursed for such payments by Borrower or any other
Person. THE PARTIES INTEND FOR THE PROVISIONS OF THIS SECTION TO APPLY TO AND PROTECT AGENT
FROM THE CONSEQUENCES OF ANY LIABILITY INCLUDING STRICT LIABILITY IMPOSED OR THREATENED TO
BE IMPOSED ON ANY INDEMNIFIED AGENT AS WELL AS FROM THE CONSEQUENCES OF ITS OWN NEGLIGENCE,
WHETHER OR NOT THAT NEGLIGENCE IS THE SOLE, CONTRIBUTING OR CONCURRING CAUSE OF ANY SUCH
LIABILITY.

     (i) Benefit of Section 15. The agreements contained in this Section 15 are solely
for the benefit of Agent and Lenders and are not for the benefit of, or to be relied upon by, Borrower, any affiliate of
Borrower or any other person.

     (j) Pro Rata Treatment. Subject to the provisions of this Agreement, each payment
(including each prepayment) by Borrower and each collection by Lenders (including offsets)
on account of the principal of and interest on the Notes and fees

44

 

provided for in this Agreement, that are payable by Borrower, shall be made Pro Rata; provided, however, in the
event that any Defaulting Lender shall have failed to make an Advance as contemplated under
Section 2 hereof and Agent or another Lender or Lenders shall have made such Advance,
payment received by Agent for the account of such Defaulting Lender or Lenders shall not be
distributed to such Defaulting Lender or Lenders until such Advance or Advances shall have
been repaid in full to the Lender or Lenders who funded such Advance or Advances.

     (k) Assumption as to Payments. Except as specifically provided herein, unless Agent
shall have received notice from Borrower prior to the date on which any payment is due to
Lenders hereunder that Borrower will not make such payment in full, Agent may, but shall not
be required to, assume that Borrower has made such payment in full to Agent on such date and
Agent may, in reliance upon such assumption, cause to be distributed to each Lender on such
due date an amount equal to the amount then due such Lender. If and to the extent Borrower
shall not have so made such payment in full to Agent, each Lender shall repay to Agent
forthwith on demand such amount distributed to such Lender together with interest thereon,
for each day from the date such amount is distributed to such Lender until the date such
Lender repays such amount to Agent, at the interest rate applicable to such portion of the
Loan.

     (l) Other Financings. Without limiting the rights to which any Lender otherwise is
or may become entitled, such Lender shall have no interest, by virtue of this Agreement or
the Loan Documents, in (a) any present or future loans from, letters of credit issued by, or
leasing or other financial transactions by, any other Lender to, on behalf of, or with
Borrower (collectively referred to herein as “Other Financings”) other than the obligations
hereunder; (b) any present or future guarantees by or for the account of Borrower which are
not contemplated by the Loan Documents; (c) any present or future property taken as security
for any such Other Financings; or (d) any property now or hereafter in the possession or
control of any other Lender which may be or become security for the obligations of Borrower
arising under any loan document by reason of the general description of indebtedness secured
or property contained in any other agreements, documents or instruments relating to any such
Other Financings.

     (m) Interests of Lenders. Nothing in this Agreement shall be construed to create a partnership or joint venture
between Lenders for any purpose. Agent, Lenders and Borrower recognize that the respective
obligations of Lenders under the Commitments shall be several and not joint and that neither
Agent nor any of Lenders shall be responsible or liable to perform any of the obligations of
the other under this Agreement. Each Lender is deemed to be the owner of an undivided
interest in and to all rights, titles, benefits and interests belonging and accruing to
Agent under the Security Instruments, including, without limitation, liens and security
interests in any collateral, fees and payments of principal and interest by Borrower under
the Commitments on a Pro Rata basis. Each Lender shall perform all duties and obligations
of Lenders under this Agreement in the same proportion as its ownership interest in the
Loans outstanding at the date of determination thereof.

     (n) Investments. Whenever Agent in good faith determines that it is uncertain

45

 

about how to distribute to Lenders any funds which it has received, or whenever Agent in good
faith determines that there is any dispute among Lenders about how such funds should be
distributed, Agent may choose to defer distribution of the funds which are the subject of
such uncertainty or dispute. If Agent in good faith believes that the uncertainty or
dispute will not be promptly resolved, or if Agent is otherwise required to invest funds
pending distribution to Lenders, Agent may invest such funds pending distribution (at the
risk of Lenders). All interest on any such investment shall be distributed upon the
distribution of such investment and in the same proportions and to the same Persons as such
investment. All monies received by Agent for distribution to Lenders (other than to the
Person who is Agent in its separate capacity as a Lender) shall be held by Agent pending
such distribution solely as Agent for such Lenders, and Agent shall have no equitable title
to any portion thereof.

     (o) Delegation to Affiliates. Borrower and Lenders agree that Agent may delegate
any of its duties under this Agreement to any of its Affiliates. Any such Affiliate (and
such Affiliate’s directors, officers, agents and employees) which perform duties in
connection with this Agreement shall be entitled to the same benefits of the
indemnification, waiver and other protective provisions to which Agent is entitled under
Sections 15 and 18.

     (p) Execution of Collateral Documents. Lenders hereby empower and authorize Agent
to execute and deliver the Security Instruments and all related financing statements and
other financing statements, agreements, documents or instruments that shall be necessary or
appropriate to effect the purposes of the Security Instruments.

     (q) Collateral Releases. Lenders hereby empower and authorize Agent to execute and
deliver to Borrower on its behalf any agreements, documents, or instruments as shall be necessary or appropriate to
reflect any releases of Collateral which shall be permitted by the terms hereof (including,
without limitation, the release of Collateral that Borrower is permitted to sell pursuant to
Section 13 hereof) or of any other Loan Document or which shall otherwise have been approved
by the Required Lenders pursuant to Section 15 hereof.

     16. Exercise of Rights. No failure to exercise, and no delay in exercising, on the part of Agent
or Lenders, any right hereunder shall operate as a waiver thereof, nor shall any single or partial
exercise thereof preclude any other or further exercise thereof or the exercise of any other right.
The rights of Agent and Lenders hereunder shall be in addition to all other rights provided bylaw.

     17. Notices. Any notices or other communications required or permitted to be given by this
Agreement or any other documents or instruments referred to herein must be given in writing (which
may be by bank wire, telecopy or similar writing) and shall be given to the party to whom such
notice or communication is directed at the address or telecopy number of such party as follows: (a)
BORROWER: Approach Resources I, LP, 6300 Ridglea Place, Suite 1107, Fort Worth, Texas 76116,
Attention: J. Ross Craft, Facsimile No. (817) 989-9001; with copy to: Steve Smart, 6300 Ridglea
Place, Suite 1107, Fort Worth, Texas 76116, Facsimile No. (817) 989-9001; (b) AGENT and LENDERS:
c/o The Frost National Bank, 777 Main Street, Suite

46

 

500, Fort Worth, Texas 76102, Attention: John S. Warren, Facsimile No. (817) 420-5250. Any such notice or other communication shall be effective
(a) if given by telecopy, when such telecopy is transmitted to the telecopy number specified in
this Section 17 and the appropriate answer back is received or receipt is otherwise confirmed, (b)
if given by mail, three (3) days after deposit in the mails with first-class postage, prepaid, as
addressed as aforesaid or (c) if given by any other method, when delivered at the address specified
in this Section 17; provided, however, that notices to Agent under Sections 2, 3, 4 or 5 hereof
shall not be effective until received. Any notice required to be given to Lenders shall be given
to Agent and distributed to all Lenders by Agent.

     18. Expenses. Borrower shall pay (i) all reasonable and necessary out-of-pocket expenses of Agent,
including reasonable fees and disbursements of special counsel for Agent, in connection with the
preparation of this Agreement, any waiver or consent hereunder or any amendment hereof or any
Default or Event of Default or alleged Default or Event of Default hereunder, (ii) all reasonable
and necessary out-of-pocket expenses of Agent, including reasonable fees and disbursements of
special counsel for Agent in connection with the preparation of any participation agreement for a
participant or participants requested by Borrower or any amendment thereof and (iii) if a Default
or an Event of Default occurs, all reasonable and necessary out-of-pocket expenses incurred by
Lenders, including reasonable fees and disbursements of counsel, in connection with such Default
and Event of Default and collection and other enforcement proceedings resulting therefrom.
BORROWER HEREBY ACKNOWLEDGES THAT MURPHY MAHON KEFFLER & FARRIER, L.L.P. IS SPECIAL COUNSEL TO
FROST, AS AGENT AND AS A LENDER, UNDER THIS AGREEMENT AND THAT IT IS NOT COUNSEL TO,
NOR DOES IT REPRESENT BORROWER IN CONNECTION WITH THE TRANSACTIONS DESCRIBED IN THIS AGREEMENT.
Borrower is relying on separate counsel in the transaction described herein. Borrower shall
indemnify Lenders, within thirty (30) days after written demand therefor, against any transfer
taxes, document taxes, assessments or charges made by any governmental authority and paid by
Lenders (or Agent on behalf of Lenders) by reason of the execution, delivery and filing of the Loan
Documents. The obligations of this Section 18 shall survive any termination of this Agreement, the
expiration of the Loans and the payment of all indebtedness of Borrower to Lenders hereunder and
under the Notes.

     19. Indemnity. Borrower hereby agrees to indemnify Agent, each Lender, their respective
Affiliates, and each of their directors, officers, and employees (the “Indemnified Parties”)
against all losses, claims, damages, penalties, judgments, liabilities and expenses (including,
without limitation, all expenses of litigation or preparation therefor of any Indemnified Party,
Agent, any Lender or any Affiliate that is a party thereto) which any of them may pay or incur
arising out of or relating to this Agreement, the other Loan Documents, the transactions
contemplated hereby or the direct or indirect application or proposed application of the proceeds
of any loan hereunder even if any of the foregoing arises out of the ordinary negligence of the
party seeking indemnification except to the extent that they are determined in a final
non-appealable judgment by a court of competent jurisdiction to have resulted from the gross
negligence or willful misconduct of the party seeking indemnification. The indemnity set forth
herein shall be in addition to any other obligations or liabilities of Borrower to any Indemnified
Party, Agent, and each of Lenders hereunder or at common law or otherwise, and shall survive any
termination of this Agreement, the expiration of the Loans and the payment of

47

 

all indebtedness of Borrower to Lenders hereunder and under the Notes. THE PARTIES INTEND FOR THE PROVISIONS OF THIS
SECTION TO APPLY TO AND PROTECT EACH INDEMNIFIED PARTY FROM THE CONSEQUENCES OF ANY LIABILITY
INCLUDING STRICT LIABILITY IMPOSED OR THREATENED TO BE IMPOSED ON AGENT AS WELL AS FROM THE
CONSEQUENCES OF ITS OWN NEGLIGENCE, WHETHER OR NOT THAT NEGLIGENCE IS THE SOLE, CONTRIBUTING, OR
CONCURRING CAUSE OF ANY CLAIM.

     20. Non-Liability of Lenders. The relationship between Borrower on the one hand and Lenders and
Agent on the other hand shall be solely that of borrower and lender. Neither Agent, nor any Lender
shall have any fiduciary responsibility to Borrower. Neither Agent, nor any Lender undertakes any
responsibility to Borrower to review or inform Borrower of any matter in connection with any phase
of Borrower’s businesses or operations. Borrower agrees that neither Agent, nor any Lender shall
have any liability to Borrower (whether sounding in tort, contract or otherwise) for losses
suffered by Borrower in connection with, arising out of, or in any way related to, the transactions
contemplated and the relationship established by this Agreement and the other Loan Documents, or
any act, omission or event occurring in connection therewith, unless it is determined in a final
non-appealable judgment by a court of competent jurisdiction that such loss resulted from the gross
negligence or willful misconduct of the party from which recovery is sought. Neither Agent, nor
any Lender shall have any liability with respect to, and Borrower
hereby waives, releases and agrees not to sue for, any special, indirect, consequential or punitive
damages suffered by Borrower in connection with, arising out of, or in any way related to this
Agreement, the Loan Documents or any transaction contemplated thereby.

     21. Governing Law. THIS AGREEMENT IS BEING EXECUTED AND DELIVERED, AND IS INTENDED TO BE
PERFORMED, IN FORT WORTH, TARRANT COUNTY, TEXAS, AND THE SUBSTANTIVE LAWS OF TEXAS SHALL GOVERN THE
VALIDITY, CONSTRUCTION, ENFORCEMENT AND INTERPRETATION OF THIS AGREEMENT AND ALL OTHER DOCUMENTS
AND INSTRUMENTS REFERRED TO HEREIN, UNLESS OTHERWISE SPECIFIED THEREIN.

     22. Invalid Provisions. If any provision of this Agreement is held to be illegal, invalid, or
unenforceable under present or future laws effective during the term of this Agreement, such
provisions shall be fully severable and this Agreement shall be construed and enforced as if such
illegal, invalid or unenforceable provision had never comprised a part of this Agreement, and the
remaining provisions of the Agreement shall remain in full force and effect and shall not be
affected by the illegal, invalid or unenforceable provision or by its severance from this
Agreement.

     23. Maximum Interest Rate. Regardless of any provisions contained in this Agreement or in any
other documents and instruments referred to herein, Lenders shall never be deemed to have
contracted for or be entitled to receive, collect or apply as interest on the Notes any amount in
excess of the Maximum Rate, and in the event any Lender ever receives, collects or applies as
interest any such excess, or if an acceleration of the maturities of any Notes or if any prepayment
by Borrower results in Borrower having paid any interest in excess of the Maximum Rate, such amount
which would be excessive interest shall be applied to the reduction

48

 

of the unpaid principal balance of the Notes for which such excess was received, collected or applied, and, if the principal
balance of such Note is paid in full, any remaining excess shall forthwith be paid to Borrower.
All sums paid or agreed to be paid to Lenders for the use, forbearance or detention of the
indebtedness evidenced by the Notes and/or this Agreement shall, to the extent permitted by
applicable law, be amortized, prorated, allocated and spread throughout the full term of such
indebtedness until payment in full so that the rate or amount of interest on account of such
indebtedness does not exceed the Maximum Rate. In determining whether or not the interest paid or
payable under any specific contingency exceeds the Maximum Rate of interest permitted by law,
Borrower and Lenders shall, to the maximum extent permitted under applicable law, (i) characterize
any non-principal payment as an expense, fee or premium, rather than as interest; and (ii) exclude
voluntary prepayments and the effect thereof; and (iii) compare the total amount of interest
contracted for, charged or received with the total amount of interest which could be contracted
for, charged or received throughout the entire contemplated term of the Note at the Maximum Rate.

     For purposes of Section 303 of the Texas Finance Code, to the extent applicable to any
Lender or Agent, Borrower agrees that the Maximum Rate shall be the “weekly ceiling” as
defined in said Chapter, provided that such Lender or Agent, as applicable, may also rely, to the
extent permitted by applicable laws of the State of Texas and the United States of America, on
alternative maximum rates of interest under the Texas Finance Code or other laws applicable to such
Lender or Agent from time to time if greater (the “Maximum Rate”).

     24. Amendments. This Agreement may be amended only by an instrument in writing executed by an
authorized officer of the party against whom such amendment is sought to be enforced. No
modification or waiver of any provision of the Loan Documents, including this Agreement, or the
Notes nor consent to departure therefrom, shall be effective unless in writing signed by Borrower
and Required Lenders; provided, however, that no amendment, waiver, or other action shall be
effected pursuant to this Section 24 without the consent of all Lenders which: (a) would increase
the Borrowing Base, (b) would reduce any fees hereunder, or the principal of, or the interest on,
any Lender’s Note or Notes, (c) would postpone any date fixed for any payment of any fees
hereunder, or any principal or interest of any Lender’s Note or Notes, (d) would increase the
aggregate Commitments or any Lender’s individual Commitment hereunder or would materially alter
Agent’s obligations to any Lender hereunder, (e) would release Borrower from its obligation to pay
any Lender’s Note or Notes, (f) would release any Collateral (other than the Collateral that is
sold or transferred with the prior consent of Required Lenders pursuant to Section 13(a)(ii)), (g)
would change the definition of Required Lenders (or without the prior consent of Required Lenders
if such consent is not required), or (h) would amend this sentence. No such consent or waiver
shall extend beyond the particular case and purpose involved. No notice or demand given in any
case shall constitute a waiver of the right to take other action in the same, similar or other
circumstances without such notice or demand. No amendment of any provision of this Agreement
relating to Agent shall be effective without the written consent of Agent.

     25. Multiple Counterparts. This Agreement may be executed in a number of identical separate
counterparts, each of which for all purposes is to be deemed an original, but all of which shall
constitute, collectively, one agreement. No party to this Agreement shall be bound hereby until a
counterpart of this Agreement has been executed by all parties hereto.

49

 

Delivery of an executed counterpart of a signature page of the Agreement by telecopy shall be effective as delivery of a
manually executed counterpart of this Agreement.

     26. Conflict. In the event any term or provision hereof is inconsistent with or conflicts with any
provision of the Loan Documents, the terms or provisions contained in this Agreement shall be
controlling.

     27. Survival. All covenants, agreements, undertakings, representations and warranties made in the
Loan Documents, including this Agreement, the Notes or other documents and instruments referred to
herein shall survive all closings hereunder and shall not be affected by any investigation made by
any party.

     28. Parties Bound. This Agreement shall be binding upon and inure to the benefit of the parties
hereto and their respective successors and assigns, provided, however, that Borrower may not,
without the prior written consent of all of Lenders, assign any rights, powers, duties or
obligations hereunder.

     29. Assignments and Participations.

     (a) Each Lender shall have the right to sell, assign or transfer all or any part of its
Note or Notes, its Commitment and its rights and obligations hereunder to one or more
Affiliates, Lenders, financial institutions, pension plans, insurance companies, investment
funds, or similar Persons who are Eligible Assignees or to a Federal Reserve Bank; provided,
that each sale, assignment or transfer (other than to an Affiliate or a Federal Reserve
Bank) shall require the consent of Agent and Borrower, which consents will not be
unreasonably withheld; provided, however, that if an Event of Default has occurred and is
continuing, the consent of Borrower shall not be required. Any such assignee, transferee or
recipient shall have, to the extent of such sale, assignment, or transfer, the same rights,
benefits and obligations as it would if it were such Lender and a holder of such Note,
Commitment and rights and obligations, including, without limitation, the right to vote on
decisions requiring consent or approval of all Lenders or Required Lenders and the
obligation to fund its Commitment; provided, that (1) each such sale, assignment, or
transfer (other than to an Affiliate or a Federal Reserve Bank) shall be in an aggregate
principal amount not less than $5,000,000, (2) each remaining Lender shall at all times
maintain Commitment then outstanding in an aggregate principal amount of at least equal to
$5,000,000; (3) each such sale, assignment or transfer shall be of a Pro Rata Part of such
Lender’s Commitment, (4) no Lender may offer to sell its Note or Notes, Commitment, rights
and obligations or interests therein in violation of any securities laws; and (5) no such
assignments (other than to a Federal Reserve Bank) shall become effective until the
assigning Lender and its assignee delivers to Agent and Borrower an Assignment and
Acceptance and the Note or Notes subject to such assignment and other documents evidencing
any such assignment. An assignment fee in the amount of $3,500 for each such assignment
(other than to an Affiliate, a Lender or the Federal Reserve Bank) will be payable by the
transferring Lender to Agent by assignor or assignee. Within five (5) Business Days after
its receipt of copies of the Assignment and Acceptance and the other documents relating
thereto and the Note or Notes, Borrower shall execute and deliver to Agent (for delivery to
the relevant assignee) a new Note or

50

 

Notes evidencing such assignee’s assigned Commitment
and if the assignor Lender has retained a portion of its Commitment, a replacement Note in
the principal amount of the Commitment retained by the assignor (except as provided in the
last sentence of this paragraph (a) such Note or Notes to be in exchange for, but not in
payment of, the Note or Notes held by such Lender). On and after the effective date of an
assignment hereunder, the assignee shall for all purposes be a Lender, party to this
Agreement and any other Loan Document executed by Lenders and shall have all the rights and
obligations of a Lender under the Loan Documents, to the same extent as if it were an
original party thereto, and no further consent or action by Borrower, Lenders or Agent shall
be required to release the transferor Lender with respect to its Commitment assigned to such
assignee and the transferor Lender shall henceforth be so released.

     (b) Each Lender shall have the right to grant participations in all or any part of such
Lender’s Notes and Commitment hereunder to one or more pension plans, investment funds,
insurance companies, financial institutions or other Persons, provided, that:

     (i) each Lender granting a participation shall retain the right to vote
hereunder, and no participant shall be entitled to vote hereunder on decisions
requiring consent or approval of Lender or Required Lenders (except as set forth in
(iii) below);

     (ii) in the event any Lender grants a participation hereunder, such Lender’s
obligations under the Loan Documents shall remain unchanged, such Lender shall
remain solely responsible to the other parties hereto for the performance of such
obligations, such Lender shall remain the holder of any such Note or Notes for all
purposes under the Loan Documents, and Agent, each Lender and Borrower shall be
entitled to deal with the Lender granting a participation in the same manner as if
no participation had been granted; and

     (iii) no participant shall ever have any right by reason of its participation
to exercise any of the rights of Lenders hereunder, except that any Lender may agree
with any participant that such Lender will not, without the consent of such
participant (which consent may not be unreasonably withheld) consent to any
amendment or waiver requiring approval of all Lenders.

     (c) It is understood and agreed that any Lender may provide to assignees and
participants and prospective assignees and participants financial information and reports
and data concerning Borrower’s properties and operations which was provided to such Lender
pursuant to this Agreement, provided, that each recipient thereto has first agreed, for the
benefit of Borrower, to hold such information, reports and data in confidence on the terms
set out in Section 12(j) hereof.

     (d) Upon the reasonable request of either Agent or Borrower, each Lender will identify
those to whom it has assigned or participated any part of its Notes and Commitment, and
provide the amounts so assigned or participated.

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     30. Choice
of Forum: Consent to Service of Process and Jurisdiction. THE OBLIGATIONS OF
BORROWER UNDER THE LOAN DOCUMENTS ARE PERFORMABLE IN TARRANT COUNTY, TEXAS. ANY SUIT, ACTION OR
PROCEEDING AGAINST BORROWER WITH RESPECT TO THE LOAN DOCUMENTS OR ANY JUDGMENT ENTERED BY ANY COURT
IN RESPECT THEREOF, MAY BE BROUGHT IN THE COURTS OF THE STATE OF TEXAS, COUNTY OF TARRANT, OR IN
THE UNITED STATES COURTS LOCATED IN TARRANT COUNTY, TEXAS AND BORROWER HEREBY SUBMITS TO THE
NON-EXCLUSIVE JURISDICTION OF SUCH COURTS FOR THE PURPOSE OF ANY SUCH SUIT, ACTION OR PROCEEDING.
BORROWER HEREBY IRREVOCABLY CONSENTS TO SERVICE OF PROCESS IN ANY SUIT, ACTION OR PROCEEDING IN
SAID COURT BY THE MAILING THEREOF BY LENDER BY REGISTERED OR CERTIFIED MAIL, POSTAGE PREPAID, TO
BORROWER, AT THE ADDRESS FOR NOTICES AS PROVIDED IN SECTION 17. BORROWER HEREBY IRREVOCABLY WAIVES
ANY OBJECTION WHICH IT MAY NOW OR HEREAFTER HAVE TO THE LAYING OF VENUE OF ANY SUIT, ACTION OR
PROCEEDING ARISING OUT OF OR RELATING TO ANY LOAN DOCUMENT BROUGHT IN THE COURTS LOCATED IN THE
STATE OF TEXAS, COUNTY OF TARRANT, AND HEREBY FURTHER IRREVOCABLY WAIVES ANY CLAIM THAT ANY SUCH
SUIT, ACTION OR PROCEEDING BROUGHT IN ANY SUCH COURT HAS BEEN BROUGHT IN AN INCONVENIENT FORUM.

     31. Waiver of Jury Trial. BORROWER, AGENT AND LENDERS HEREBY WAIVE, TO THE FULLEST EXTENT
PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT
OF OR RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

     32. Other Agreements. THIS WRITTEN CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE
FINAL AGREEMENT AMONG THE PARTIES 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.

     33. Financial Terms. All accounting terms used in this Agreement which are not specifically
defined herein shall be construed in accordance with Accounting Principles.

     34. Tri-Party Loan. Texas Finance Code, Section 346 shall not apply to loans evidenced by this
Agreement or the Notes.

     35. USA Patriot Act Notice. Each Lender hereby notifies 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
Borrower, which information includes the name and address of Borrower and other information that
will allow such Lender to identify Borrower in accordance with the Act.

     36. Original Credit Agreement. Effective upon the Effective Date, this Agreement shall supersede
in its entirety the Credit Agreement dated November 23, 2004 between Borrower

52

 

and Frost (as
amended, the “Original Credit Agreement”); provided, however, that all loans, letters of credit,
and other indebtedness, obligations and liabilities outstanding under the Original Credit Agreement
on such date shall continue to constitute Loans, Letters of Credit and other indebtedness,
obligations and liabilities under this Agreement and the execution and delivery of this Agreement
or any of the Loan Documents hereunder shall not constitute a novation, refinancing or any other
fundamental change in the relationship among the parties and the Loans, Letters of Credit, and
other indebtedness, obligations and liabilities outstanding hereunder, to the extent outstanding
under the Original Credit Agreement immediately prior to the date hereof, shall constitute the same
loans, letters of credit, and other indebtedness, obligations and liabilities as outstanding under
the Original Credit Agreement.

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

[Signature Pages to Follow]

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	 	 	BORROWER:	 	 
	 
	 	 	 	 	 	 
	 	 	APPROACH RESOURCES I, LP,

a Texas limited partnership	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	Approach Operating, LLC,

a Delaware limited liability company,

its general partner	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	Approach Resources Inc., 

a Delaware corporation, its sole member	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	/s/ J. Ross Craft	 	 
	 

	 	 	 	 

J. Ross Craft, President
	 	 

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AGENT:

	 	 	 	 	 
	 	

THE FROST NATIONAL BANK

 	 
	 	By:  	/s/ John S. Warren
 	 
	 	 	John S. Warren, Senior Vice President 	 
	 	 	 	 
	 

55

 

 LENDERS:

	 	 	 	 	 
	Commitment Percentage 

50%	 	THE FROST NATIONAL BANK
	 
	 	 	 	 
	 

	 	By:
	 	/s/ John S. Warren
	 

	 	 	 	 
	 

	 	 	 	John S. Warren, Senior Vice President

56

 

	 	 	 	 	 
	Commitment Percentage 

50%	 	JPMORGAN CHASE BANK, NA
	 
	 	 	 	 
	 

	 	By:
	 	/s/ Wm. Mark Cranmer
	 

	 	 	 	 
	 

	 	 	 	Wm. Mark Cranmer, Senior Vice President

57

 

EXHIBIT “A”

NOTICE OF BORROWING

     The undersigned APPROACH RESOURCES I, LP, a Texas limited partnership (“Borrower”), is
authorized to execute this Notice of Borrowing in the capacity stated below. With reference to
that certain Amended and Restated Credit Agreement dated as of
February ___, 2007 (as same may be
amended, modified, increased, supplemented and/or restated from time to time, the “Agreement”)
entered into by and among Borrower and THE FROST NATIONAL BANK (“Agent”), and the financial
institutions parties thereto (the “Lenders”), Borrower further certifies, represents and warrants
that all of the foregoing statements are true and correct (each capitalized term used herein having
the same meaning given to it in the Agreement unless otherwise specified):

     (a) Borrower requests that Lenders advance Borrower on the Loan the aggregate sum of $                    
by no later than                     . Immediately following such Advance, the aggregate outstanding balance of
Advances shall equal $                     on the Loan.

     (b)
This Advance shall be a: Base Rate Loan                      , or a Eurodollar Loan                     , (if Eurodollar
please state requested Interest Period                      months).

     (c) As of the date hereof, and as a result of the making of the requested Advance,
there does not and will not exist any Default or Event of Default.

     (d) Borrower has performed and complied in all material respects with all agreements
and conditions contained in the Agreement which are required to be performed or complied
with by Borrower before or on the date hereof.

     (e) The representations and warranties contained in the Agreement are true and correct
in all material respects as of the date hereof and shall be true and correct in all material
respects upon the making of the Advance, with the same force and effect as though made on
and as of the date hereof and thereof (except to the extent such representations and
warranties related solely to an earlier date).

     (f) No change that would cause a Material Adverse Effect to the condition, financial or
otherwise, of Borrower has occurred since the most recent Financial Statement provided to
Lenders.

1

 

          EXECUTED AND DELIVERED this                     day of                      , 200 ___.

	 	 	 	 	 	 	 
	 	 	APPROACH RESOURCES I, LP,

a Texas limited partnership	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	Approach Operating, LLC,	 	 
	 

	 	 	 	a Delaware limited liability company,

its general partner	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	Approach Resources Inc.,	 	 
	 

	 	 	 	a Delaware corporation, its sole member	 	 
	 
	 	 	 	 	 	 
	 

	 	By:	 	 	 	 
	 

	 	 	 	 

J. Ross Craft, President
	 	 

2

 

EXHIBIT “B”

REVOLVING NOTE

	 	 	 	 	 
	$100,000,000.00

	 	Fort Worth, Texas
	 	February ___, 2007

     FOR VALUE RECEIVED, the undersigned APPROACH RESOURCES I, LP, a Texas limited partnership
(“Borrower”), hereby unconditionally promises to pay to the order of THE FROST NATIONAL BANK and
the other financial institutions named in the Credit Agreement (as hereinafter defined) (the
“Lenders”) at the offices of THE FROST NATIONAL BANK (the “Agent”) in Tarrant County, Texas, the
principal sum of ONE HUNDRED MILLION AND NO/100 DOLLARS ($100,000,000.00), or so much thereof as
may be advanced and outstanding at any time or from time to time pursuant to the Credit Agreement
in lawful money of the United States of America together with interest from the date hereof until
paid at the rates specified in the Credit Agreement. All payments of principal and interest due
hereunder are payable at the offices of Agent at 777 Main Street,
Suite ____, Fort Worth, Texas 76102,
Attention: John S. Warren, or at such other address as Agent shall designate in writing to
Borrower.

     The principal and all accrued interest on this Note shall be due and payable in accordance
with the terms and provisions of the Credit Agreement.

     This Note is executed pursuant to that certain Credit Agreement (the “Credit Agreement”) dated
of even date herewith by and among Borrower, the Agent and Lenders, and is one of the Notes
referred to therein. Reference is made to the Credit Agreement and the Loan Documents (as that
term is defined in the Credit Agreement) for a statement of prepayment rights and obligations of
Borrower, for a statement of the terms and conditions under which the due date of this Note may be
accelerated and for statements regarding other matters affecting this Note (including without
limitation the obligations of the holder hereof to advance funds hereunder, principal and interest
payment due dates, voluntary and mandatory prepayments, exercise of rights and remedies, payment of
attorneys’ fees, court costs and other costs of collection and certain waivers by Borrower and
others now or hereafter obligated for payment of any sums due hereunder). Upon the occurrence of
an Event of Default (as that term is defined in the Credit Agreement and Loan Documents) the Agent
may declare forthwith to be entirely and immediately due and payable the principal balance hereof
and the interest accrued hereon, and the Lender shall have all rights and remedies of the Lender
under the Credit Agreement and Loan Documents. This Note may be prepaid in accordance with the
terms and provisions of the Credit Agreement.

     Regardless of any provision contained in this Note, the holder hereof shall never be entitled
to receive, collect or apply, as interest on this Note, any amount in excess of the Maximum Rate
(as such term is defined in the Credit Agreement), and, if the holder hereof ever receives,
collects, or applies as interest any such amount which would be excessive interest, it shall be
deemed a partial prepayment of principal and treated hereunder as such; and, if the indebtedness
evidenced hereby is paid in full, any remaining excess shall forthwith be paid to Borrower. In
determining whether or not the interest paid or payable under any specific contingency exceeds the
Maximum Rate, Borrower and the holder hereof shall, to the maximum extent permitted under
applicable law (i) characterize any non-principal payment as an expense,

1

 

fee or premium rather than as interest, (ii) exclude voluntary prepayments and the effects
thereof, and (iii) spread the total amount of interest throughout the entire contemplated term of
the obligations evidenced by this Note and/or referred to in the Credit Agreement so that the
interest rate is uniform throughout the entire term of this Note; provided that, if this Note is
paid and performed in full prior to the end of the full contemplated term thereof and if the
interest received for the actual period of existence thereof exceeds the Maximum Rate, the holder
hereof shall refund to Borrower the amount of such excess or credit the amount of such excess
against the indebtedness evidenced hereby, and, in such event, the holder hereof shall not be
subject to any penalties provided by any laws for contracting for, charging, taking, reserving or
receiving interest in excess of the Maximum Rate.

     If any payment of principal or interest on this Note shall become due on a day other than a
Business Day (as such term is defined in the Credit Agreement), such payment shall be made on the
next succeeding Business Day and such extension of time shall in such case be included in computing
interest in connection with such payment.

     If this Note is placed in the hands of an attorney for collection, or if it is collected
through any legal proceeding at law or in equity or in bankruptcy, receivership or other court
proceedings, Borrower agrees to pay all costs of collection, including, but not limited to, court
costs and reasonable attorneys’ fees.

     Borrower and each surety, endorser, guarantor and other party ever liable for payment of any
sums of money payable on this Note, jointly and severally waive presentment and demand for payment,
notice of intention to accelerate the maturity, protest, notice of protest and nonpayment, as to
this Note and as to each and all installments hereof, and agree that their liability under this
Note shall not be affected by any renewal or extension in the time of payment hereof, or in any
indulgences, or by any release or change in any security for the payment of this Note, and hereby
consent to any and all renewals, extensions, indulgences, releases or changes.

     THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE APPLICABLE LAWS OF THE
UNITED STATES OF AMERICA AND THE LAWS OF THE STATE OF TEXAS. BORROWER AGREES THAT THIS NOTE IS
PERFORMABLE IN TARRANT COUNTY, TEXAS AND THAT SUCH COUNTY IS PROPER VENUE FOR ANY ACTION OR
PROCEEDING INVOLVING THIS NOTE TO THE EXCLUSION OF ALL OTHER VENUES.

     THIS INSTRUMENT SECURES A LINE OF CREDIT USED PRIMARILY FOR BUSINESS, COMMERCIAL OR
AGRICULTURAL PURPOSES.

     THIS WRITTEN NOTE, THE CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL
AGREEMENTS BETWEEN THE PARTIES 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.

2

 

          EXECUTED as of the date and year first above written.

	 	 	 	 	 	 	 
	 	 	BORROWER:	 	 
	 
	 	 	 	 	 	 
	 	 	APPROACH RESOURCES I, LP,

a Texas limited partnership	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	Approach Operating, LLC,	 	 
	 

	 	 	 	a Delaware limited liability company,

its general partner	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	Approach Resources Inc.,	 	 
	 

	 	 	 	a Delaware corporation, its sole member	 	 
	 
	 	 	 	 	 	 
	 

	 	By:	 	 	 	 
	 

	 	 	 	 

J. Ross Craft, President
	 	 

3

 

EXHIBIT “C”

CERTIFICATE OF COMPLIANCE

     The undersigned APPROACH RESOURCES I, LP, a Texas limited partnership (“Borrowers”), hereby
certifies that J. Ross Craft is authorized to execute this Certificate of Compliance (in the
capacity stated in his signature below). With reference to that certain Amended and Restated
Credit Agreement, dated as of February  , 2007 (as same may be amended, modified, increased,
supplemented and/or restated from time to time, the “Agreement”) entered into between the Borrower
and THE FROST NATIONAL BANK as “Agent” and Lender, for itself and the Lenders signatory thereto
(the “Lenders”), the undersigned further certifies, represents and warrants on behalf of Borrower
that all of the following statements are true and correct (each capitalized term used herein having
the same meaning given to it in the Agreement unless otherwise specified):

     (a) Borrower has fulfilled in all material respects its obligations under the Notes and
Loan Documents, including the Agreement, and all representations and warranties made herein
and therein continue (except to the extent they relate solely to an earlier date) to be true
and correct in all material respects.

     (b) No Default or Event of Default has occurred under the Loan Documents, including the
Agreement.

     (c) To the extent requested from time to time by the Agent, the certifying party shall
specifically affirm compliance of Borrower in all material respects with any of its
representations and warranties (except to the extent they relate solely to an earlier date)
or obligations under said instruments.

     (d)
Financial Computations for the period ending _____.

     (i) Current Ratio:

     EXECUTED,
DELIVERED AND CERTIFIED TO this ___ day of ______, 200_.

	 	 	 	 	 	 	 
	 	 	APPROACH RESOURCES I, LP,

a Texas limited partnership	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	Approach Operating, LLC,	 	 
	 

	 	 	 	a Delaware limited liability company,

its general partner	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	Approach Resources Inc.,	 	 
	 

	 	 	 	a Delaware corporation, its sole member	 	 
	 
	 	 	 	 	 	 
	 

	 	By:	 	 	 	 
	 

	 	 	 	 

J. Ross Craft, President
	 	 

1

 

EXHIBIT “D”

ASSIGNMENT AND ACCEPTANCE AGREEMENT

     This Assignment Agreement (“Assignment Agreement”) between                      (the “Assignor”) and
                     (the “Assignee”) is dated as of                     , 2007. The parties hereto agree as follows:

     1. PRELIMINARY STATEMENT. The Assignor is a party to a Credit Agreement (which, as it
may be amended, modified, renewed or extended from time to time is herein called the “Credit
Agreement”) described in Item 1 of Schedule 1 attached hereto (“Schedule 1”). Capitalized terms
used herein and not otherwise defined herein shall have the meanings attributed to them in the
Credit Agreement.

     2. ASSIGNMENT AND ASSUMPTION. The Assignor hereby sells and assigns to the Assignee,
and the Assignee hereby purchases and assumes from the Assignor, an interest in and to the
Assignor’s rights and obligations under the Credit Agreement and the other Loan Documents, such
that after giving effect to such assignment the Assignee shall have purchased pursuant to this
Assignment Agreement the percentage interest specified in Item 3 of Schedule 1 of all outstanding
rights and obligations under the Credit Agreement and the other Loan Documents relating to the
facilities listed in Item 3 of Schedule 1. The aggregate Commitment (or Loans, if the applicable
Commitment has been terminated) purchased by the Assignee hereunder is set forth in Item 4 of
Schedule 1.

     3. EFFECTIVE DATE. The effective date of this Assignment Agreement (the “Effective
Date”) shall be the later of the date specified in Item 5 of Schedule 1 or two Business Days (or
such shorter period agreed to by the Agent) after this Assignment Agreement, together with any
consents required under the Credit Agreement, are delivered to the Agent. In no event will the
Effective Date occur if the payments required to be made by the Assignee to the Assignor on the
Effective Date are not made on the proposed Effective Date.

     4. PAYMENT OBLIGATIONS. In consideration for the sale and assignment of Loans
hereunder, the Assignee shall pay the Assignor, on the Effective Date, the amount agreed to by the
Assignor and the Assignee. On and after the Effective Date, the Assignee shall be entitled to
receive from the Agent all payments of principal, interest and fees with respect to the interest
assigned hereby. The Assignee will promptly remit to the Assignor any interest on Loans and fees
received from the Agent which relate to the portion of the Commitment or Loans assigned to the
Assignee hereunder for periods prior to the Effective Date and not previously paid by the Assignee
to the Assignor. In the event that either party hereto receives any payment to which the other
party hereto is entitled under this Assignment Agreement, then the party receiving such amount
shall promptly remit it to the other party hereto.

     5. RECORDATION FEE. The Assignor and Assignee each agree to pay one-half of the
recordation fee required to be paid to the Agent in connection with this Assignment Agreement
unless otherwise specified in Item 6 of Schedule 1.

1

 

     6. REPRESENTATIONS OF THE ASSIGNOR; LIMITATIONS ON THE ASSIGNOR’S LIABILITY. The
Assignor represents and warrants that (i) it is the legal and beneficial owner of the interest
being assigned by it hereunder, (ii) such interest is free and clear of any adverse claim created
by the Assignor and (iii) the execution and delivery of this Assignment Agreement by the Assignor
is duly authorized. It is understood and agreed that the assignment and assumption hereunder are
made without recourse to the Assignor and that the Assignor makes no other representation or
warranty of any kind to the Assignee. Neither the Assignor nor any of its officers, directors,
employees, agents or attorneys shall be responsible for (i) the due execution, legality, validity,
enforceability, genuineness, sufficiency or collectability of any Loan Document, including without
limitation, documents granting the Assignor and the other Lenders a security interest in assets of
the Borrower [or Guarantor], (ii) any representation, warranty or statement made in or in
connection with any of the Loan Documents, (iii) the financial condition or creditworthiness of the
Borrower [or Guarantor], (iv) the performance of or compliance with any of the terms or provisions
of any of the Loan Documents, (v) inspecting any of the property, books or records of the Borrower,
(vi) the validity, enforceability, perfection, priority, condition, value or sufficiency of any
collateral securing or purporting to secure the Loans or (vii) any mistake, error of judgment, or
action taken or omitted to be taken in connection with the Loans or the Loan Documents.

     7. REPRESENTATIONS AND UNDERTAKINGS OF THE ASSIGNEE. The Assignee (i) confirms that
it has received a copy of the Credit Agreement and other Loan Documents, together with copies of
the financial statements requested by the Assignee and such other documents and information as it
has deemed appropriate to make its own credit analysis and decision to enter into this Assignment
Agreement, (ii) agrees that it will, independently and without reliance upon the Agent, the
Assignor or any other Lender and based on such documents and information as it shall deem
appropriate at the time, continue to make its own credit decisions in taking or not taking action
under the Loan Documents, (iii) appoints and authorizes the Agent to take such action as agent on
its behalf and to exercise such powers under the Loan Documents as are delegated to the Agent by
the terms thereof, together with such powers as are reasonably incidental thereto, (iv) confirms
that the execution and delivery of this Assignment Agreement by the Assignee is duly authorized,
(v) agrees that it will perform in accordance with its terms all of the obligations which by the
terms of the Loan Documents are required to be performed by it as a Lender, (vi) agrees that its
payment instructions and notice instructions are as set forth in the attachment to Schedule 1,
(vii) confirms that none of the funds, monies, assets or other consideration being used to make the
purchase and assumption hereunder are “plan assets” as defined under ERISA and that its rights,
benefits and interests in and under the Loan Documents will not be “plan assets” under ERISA,
(viii) agrees to indemnify and hold the Assignor harmless against all losses, costs and expenses
(including, without limitation, reasonable attorneys’ fees) and liabilities incurred by the
Assignor in connection with or arising in any manner from the Assignee’s non-performance of the
obligations assumed under this Assignment Agreement, and (ix) if applicable, attaches the forms
prescribed by the Internal Revenue Service of the United States certifying that the Assignee is
entitled to receive payments under the Loan Documents without deduction or withholding of any
United States federal income taxes.

     8. GOVERNING LAW. This Assignment Agreement shall be governed by the internal law,
and not the law of conflicts, of the State of Texas

2

 

     9. NOTICES. Notices shall be given under this Assignment Agreement in the manner set
forth in the Credit Agreement. For the purpose hereof, the addresses of the parties hereto (until
notice of a change is delivered) shall be the address set forth in the attachment to Schedule 1.

     10. COUNTERPARTS; DELIVERY BY FACSIMILE. This Assignment Agreement may be executed in
counterparts. Transmission by facsimile of an executed counterpart of this Assignment Agreement
shall be deemed to constitute due and sufficient delivery of such counterpart and such facsimile
shall be deemed to be an original counterpart of this Assignment Agreement.

     IN WITNESS WHEREOF, the duly authorized officers of the parties hereto have executed this
Assignment Agreement by executing Schedule 1 hereto as of the date first above written.

	 	 	 	 	 
	 

	 	[ASSIGNOR]

	 
	 	 	 	 
	 

	 	By:	 	 
	 

	 	 	 	 
	 

	 	Title:	 	 
	 

	 	 	 	 
	 
	 	 	 	 
	 

	 	Address: 	 	 
	 

	 	 	 	 
	 
	 	 	 	 
	 

	 	 	 	 
	 
	 	 	 	 
	 	 	[ASSIGNEE]
	 
	 	 	 	 
	 

	 	By:	 	 
	 

	 	 	 	 
	 

	 	Title:	 	 
	 

	 	 	 	 
	 
	 	 	 	 
	 

	 	Address:	 	 
	 

	 	 	 	 
	 
	 	 	 	 
	 

	 	 	 	 

3

 

(If required)

ACKNOWLEDGED AND CONSENTED TO:

THE FROST NATIONAL BANK,

as Agent

	 	 	 	 	 
	By:
	 	 	 	 
	 

	 	 

John S. Warren, Senior Vice President
	 	 
	 
	 	 	 	 
	APPROACH RESOURCES I, LP,

a Texas limited partnership	 	 
	 
	 	 	 	 
	By:

	 	Approach Operating, LLC,

a Delaware limited liability company,

its general partner	 	 
	 
	 	 	 	 
	By:

	 	Approach Resources Inc., 

a Delaware corporation, its sole member	 	 
	 
	 	 	 	 
	By:
	 	 	 	 
	 

	 	 

J. Ross Craft, President
	 	 

4

 

SCHEDULE 1

to Assignment Agreement

	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	1.	 	Description and Date of Credit Agreement: $100,000,000 Amended and Restated Credit Agreement dated February ____,
2007
	 
	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	2.	 	Date of Assignment Agreement:                     , 2007	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	3.
	 	Amounts (As of Date of Item 2 above):	 	Facility	 	Facility	 	Facility	 	Facility
	 
	 	 	 	 	 	 	1*	 	 	 	2*	 	 	 	3*	 	 	 	4*	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	a.	 	Assignee’s percentage of each	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	Facility purchased under the	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	Assignment Agreement**	 	 	 	%	 	 	 	%	 	 	 	%	 	 	 	%
	 
	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	b.	 	Amount of each Facility purchased	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	under the Assignment Agreement***	 	$	 	 	 	$	 	 	 	$	 	 	 	$	 	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	4.	 	Assignee’s Commitment (or Loans with
respect to terminated Commitments)
purchased hereunder:	 	 	 	 	 	$	 	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	5.	 	Proposed Effective Date:	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	6.	 	Non-standard Recordation Fee Arrangement	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	 	 	 	 	[Assignor/Assignee to pay 100% of fee]
 [Fee waived by Agent]

	 	 	 	 	 	 	 	 	 
	Accepted and Agreed:	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 
	[NAME OF ASSIGNOR]	 	 	 	[NAME OF ASSIGNEE]
	 
	 	 	 	 	 	 	 	 
	By:

	 	 	 	 	 	By:	 	 
	 

	 	 
	 	 	 	 	 	 
	Title:

	 	 	 	 	 	Title:	 	 
	 

	 	 
	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 
	ACCEPTED
AND CONSENTED TO BY 
APPROACH RESOURCES I, LP, 
a Texas limited
partnership

	 	 	 	ACCEPTED
AND CONSENTED TO BY 
THE FROST NATIONAL BANK
	 	 

	 	 	 	 	 	 	 	 	 
	 

	 	 	 	 	 	By:	 	 
	 

	 	 	 	 	 	 	 	 
	By:

	 	Approach Operating, LLC,

a Delaware limited liability company,

its general partner
	 	 	 	 	 	John S. Warren, Senior Vice President
	 
	 	 	 	 	 	 	 	 
	By:

	 	Approach Resources, Inc., 

a Delaware corporation, its sole member	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 
	By:
	 	 	 	 	 	 	 	 
	 

	 	 

J. Ross Craft, President
	 	 	 	 	 	 

5

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