Document:

Purchase and Sale Agreement - Texas Producing Properties

 Exhibit 10.6 
  
 PURCHASE AND SALE AGREEMENT AND 
 ASSIGNMENT OF INTERESTS – TEXAS 
 PRODUCING PROPERTIES 
  
 THIS PURCHASE AND SALE AGREEMENT AND ASSIGNMENT OF INTERESTS
(“Agreement”), executed the 16th day of June, 2005 and effective as of the 1st day of January, 2005 (“Effective Date”) by and among GEOSTAR CORPORATION, a Delaware Corporation, together with its
subsidiary and affiliated companies, FIRST SOURCE TEXAS, INC., a Delaware Corporation, FIRST SOURCE BOSSIER, LLC, a Delaware Limited Liability Company, and FIRST TEXAS GAS LP, a Delaware Limited Partnership (sometimes collectively
“Sellers”; sometimes individually “Seller”) and GASTAR EXPLORATION, LTD, an Alberta, Canada Corporation, together with its subsidiary and affiliated companies, FIRST TEXAS DEVELOPMENT, INC., a Michigan Corporation, BOSSIER BASIN,
LLC, a Delaware Limited Liability Company, and FIRST SOURCE GAS, LP, a Delaware Limited Partnership (sometimes collectively “Buyers”; sometimes individually “Buyer”). 
  
 RECITALS 
  
 WHEREAS, GeoStar Corporation (“GeoStar”) and/or one or more of its subsidiaries and affiliates, First Source Texas, Inc. (“FST”),
First Source Bossier, LLC (“FSB”) and First Texas Gas, LP (“FTG”) own certain Producing Properties and interests in the state Texas; and 
  
 WHEREAS, Gastar Exploration, Ltd. (“Gastar”) and/or one or more of its subsidiaries and affiliates, First Texas Development, Inc.
(“FTD”), Bossier Basin, LLC (“Bossier”) and First Source Gas, LP (“First Gas”) own certain Producing Properties and interests in the state of Texas, which interests are in the same Producing Properties as are owned by
GeoStar, FST, FSB and/or FTG; and 
  
 WHEREAS, GeoStar and its
subsidiaries and affiliates, Sellers herein, desire to sell, transfer, convey and assign to Gastar and its subsidiaries and affiliates, Buyers herein, and Buyers desire to purchase and receive from Sellers, all of Sellers’ collective rights,
title to and interests in, and all of Sellers’ liabilities and responsibilities in connection with, the Producing Properties in the state of Texas, including, without limitation, rights to production, rights to proceeds from production,
producing leases, associated drilling and spacing units, wells, equipment, working interests, net revenue interests, personal property, fixtures, physical facilities, rigs, drilling equipment, collection equipment, pipelines, gathering equipment and
systems, meters, pumps, piping, casing, logs, seismic information, contracts and agreements, including joint operating agreements, joint venture agreements, rig agreements, drilling agreements, and agreements pertaining to the collection, gathering,
transmission and sale of natural gas, coalbed methane gas or other hydrocarbons and hydrocarbon products, data and records and pertaining to those Producing Properties; and 
  
 NOW THEREFORE, in consideration of the mutual promises of the Parties contained herein, and other good and valuable
considerations, the receipt and sufficiency of which is hereby acknowledged, THE PARTIES HERETO AGREE AS FOLLOWS: 
  

	1.	Definitions and Interpretation 

  

	 	1.1	For purposes of this Agreement, the following terms shall have the meanings given to them below: 

  
 “Agreement” means this Purchase and Sale Agreement and Assignment of Interests. 
  
 “Affiliate” means a company, partnership, limited liability
company, limited partnership or other legal entity that, directly or indirectly, controls a Party, is directly or indirectly controlled by a Party, or is directly or indirectly under common control with a Party. “Control” in this context
means the legal or beneficial ownership, directly or indirectly, of fifty percent (50%) or more of such company, partnership or legal entity. 
  
 “Business Day” means a day other than Saturday or Sunday or any legal holiday for commercial banking institutions under the laws of the
State of Michigan. 
  

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 “Effective Date” means 7:00 a.m. (CST), January 1, 2005. 
  
 “mcf” means one thousand cubic feet of natural gas.

  
 “Net Revenue Interest” (“NRI”)
means an interest (expressed as a percentage or decimal fraction) in and to all hydrocarbons produced and saved from or attributable to a property. 
  
 “Operating Agreement” means the Joint Operating Agreement between Sellers and Buyers executed on or about March 15, 2005, effective
January 1, 2005, and attached to this Agreement as Exhibit 1. 
  
 “Party” means any one of GeoStar Corporation, First Source Texas, Inc., First Source Bossier, LLC, First Texas Gas, LP, Gastar Exploration, Ltd., First Texas Development, Inc., Bossier Basin, LLC, and First Source Gas, LP,
and “Parties” refers to all of them. 
  
 “Permitted Encumbrances” means: 
  
 (a)
lessor’s royalties, non-participating royalties, overriding royalties, reversionary interests, and similar burdens upon, measured by, or payable out of production if the net cumulative effect of such burdens does not operate to reduce the Net
Revenue Interest of Sellers in any well (or the specified zone(s) therein) to an amount less than the Net Revenue Interest set forth in the Exhibits hereto for such well (or the specified zone(s) therein) and does not obligate Sellers to bear a
Working Interest for such well (or the specified zone(s) therein) in any amount greater than the Working Interest set forth in the Exhibits hereto for such well (or the specified zone(s) therein) (unless the Net Revenue Interest for such Property is
greater than the Net Revenue Interest set forth on the applicable Exhibit in the same proportion as any increase in such Working Interest); 
  

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 (b) preferential rights to purchase and required third party consents to assignments and similar
agreements; 
  
 (c) liens for taxes or assessments not yet due or
delinquent or, if delinquent, that are being contested in good faith in the normal course of business; 
  
 (d) customary post-closing consents; 
  
 (e) conventional rights of reassignment; 
  
 (f) all applicable laws and regulations, and rights reserved to or vested in any governmental authority (i) to control or regulate any of the
Properties in any manner; (ii) by the terms of any right, power, franchise, grant, license, or permit, or by any provision of any applicable law or regulation, to terminate such right, power, franchise grant, license, or permit or to purchase,
condemn, expropriate, or recapture or to designate a purchaser of any of the Properties; (iii) to use such Property in a manner which does not materially impair the use of such Property for the purposes for which it is currently owned and
operated; and (iv) to enforce any obligations or duties affecting the Properties to any governmental authority, with respect to any franchise, grant, license, or permit; 
  
 (g) rights of a common owner of any interest in rights-of-way or easements currently held by any Seller and such common
owner as tenants in common or through common ownership; 
  
 (h)
easements, conditions, covenants, restrictions, servitudes, permits, rights-of-way, surface leases and other rights in the Properties for the purpose of surface operations, roads, alleys, highways, railways, pipelines, transmission lines,
transportation lines, distribution lines, power lines, telephone lines, and removal of timber, grazing, logging operations, canals, ditches, reservoirs, and other like purposes, or for the joint or common use of real estate, rights-of-way,
facilities, and equipment which do not materially impair the use of the Properties as currently owned and operated; 
  
 (i) zoning and planning ordinances and municipal regulations; 
  
 (j) vendors, carriers, warehousemen’s, repairmen’s, mechanics, workmen’s, materialmen’s, construction or other like liens arising by
operation of law in the ordinary course of business or incident to the construction or improvement of any property in respect of obligations which are not yet due or which are being contested in good faith by appropriate proceedings by or on behalf
of Sellers; 
  
 (k) liens created under leases and/or operating
agreements or by operation of law in respect of obligations that are not yet due or that are being contested in good faith by appropriate proceedings by or on behalf of Sellers; 
  
 (l) any encumbrance affecting the Properties which is expressly assumed, bonded or paid by Buyers at or prior to Closing or
which is discharged by Sellers at or prior to Closing; 
  
 (m) any
matters referenced in the Exhibits hereto; and 
  
 (n) all other
liens, charges, encumbrances, contracts, agreements, obligations, defects, and irregularities affecting the Properties that individually or in the aggregate are not such as to materially interfere with the operation or use of any of the Properties
(as currently owned and operated), do not reduce the Net Revenue Interest of any Seller in any well (or the specified zone(s) therein) to an amount less than the Net Revenue Interest set forth on the Exhibits hereto for such well (or the specified
zone(s) therein) and do not obligate Sellers to bear a Working Interest for such well (or the specified zone(s) therein) in any amount greater than the Working Interest set forth on the exhibits hereto for such well (unless the Net Revenue Interest
for such Properties is greater than the Net Revenue Interest set forth on the Exhibits hereto in the same proportion as any increase in such Working Interest). 
  

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 “Promissory Notes” means the unsecured, subordinated Promissory Notes in the aggregate
amount of Twenty Five Million U.S. Dollars (USD$25,000,000), dated as of the Closing Date, issued by Gastar and certain of its subsidiaries and payable to Geostar and certain of its subsidiaries. 
  
 “Properties” means the “Producing Properties,” as
defined in Section 2.1, which are more fully described in the Exhibits to be executed hereunder. 
  
 “Texas Non Producing Properties” means the real estate leasehold interests and associated rights sold and assigned by Sellers to Buyers
pursuant to the “Purchase and Sale Agreement and Assignment of Interests — Texas Non Producing Properties” of even date herewith. 
  
 “Texas Properties” means the Properties and the Texas Non Producing Properties. 
  
 “Working Interest” (“WI”) means the percentage of
costs and expenses attributable to the maintenance, development and operation of a Property. 
  
 1.2 Terms denoting the singular only shall include the plural, and vice versa. 
  
 1.3 Unless otherwise stated, a reference to a Recital, Article, Section, Schedule or Exhibit is a reference to a Recital, Article, Section, Schedule or
Exhibit of this Agreement. 
  
 1.4 Section numbers and headings
are for convenience of reference only, and shall not affect the interpretation of this Agreement. 
  
 1.5 Reference to any gender includes the other. 
  
 1.6 Reference to “including” means “including, but not by way of limitation.” 
  
 1.7 Unless otherwise expressly provided to this Agreement, reference to an
agreement (including this Agreement), document, or instrument is to the same as amended, modified, novated or replaced from time to time. 
  
 1.8 Reference to a statute or other legislative act, by-law, rule, regulation, or order is to the same as amended, modified or replaced from time to time
and to any rule, regulation or order promulgated pursuant to such law. 
  

	2.	Sale and Purchase of Properties and Assignment of Interests 

  

	 	2.1	Effect and Intent 

  
 With the execution and delivery of this Agreement, and with the execution and delivery of the Assignments, Bills of Sale and other documents of
conveyance and assumption referenced herein to be executed and delivered at Closing, Sellers shall have sold, transferred, assigned and conveyed to Buyers, and Buyers shall have purchased and received from Sellers, all (one hundred percent
(100%)) of Sellers’ rights, title to and interest in Producing Properties (as hereinafter defined) in Texas, all of Sellers’ interest in equipment and fixtures in and on said Producing Properties, all of Sellers’ rights, title
to, interests in, and obligations under all contracts and agreements pertaining to said Producing Properties, all of Sellers’ mineral rights and obligations in connection with said Producing Properties, and all of Sellers’ lease and
leasehold rights and obligations in connection with said Producing Properties. “Producing Properties” means and includes all of Sellers’ rights, title and interest in oil, gas and hydrocarbons Properties in Texas (other than the Texas
Non Producing Properties) (including rights, title to and interests in agreements or contracts granting the right or option to explore for and produce oil, natural gas, coalbed methane gas or other hydrocarbons, as applicable, including producing
wells, leasehold interests, fee mineral interests and operating rights), all production of oil, natural gas, coalbed methane gas or other hydrocarbons, all proceeds and revenues from the production and sale of oil, natural gas, coalbed methane gas,
or other hydrocarbons, wells on the Properties (whether producing, operating, shut in or temporarily abandoned), severed substances, surface rights, 
  

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 equipment (including fixtures and physical facilities located on the Properties) data (to the extent
assignable), contracts and permits. “Producing Properties” further includes all of Sellers’ rights, title to, interests in and obligations under agreements or contracts granting the right or option to explore for and produce oil,
natural gas, coalbed methane gas, or other hydrocarbons, as applicable, on those Producing Properties, including leasehold interests, fee mineral interests, operating rights, surface rights, equipment (including fixtures and physical facilities
located on the Properties) data, contracts and permits. 
  

	 	2.2	Assignments and Assumptions 

  
 At Closing, Sellers shall sell, transfer, convey and assign to Buyers, and Buyers shall purchase, receive and assume from Sellers, all of Sellers’
rights, title to, interests in and liabilities and obligations in connection with the Producing Properties, effective as of the Effective Date. 
  

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	 	2.3	Excluded Assets 

  
 As used herein, “Excluded Assets” means all other of Sellers’ assets and rights other than in the Producing Properties, including all
trade credits, all accounts receivable and all other proceeds, income or revenues attributable to the Properties with respect to any period of time prior to the Effective Date. 
  

	 	2.4	Assignment of Producing Properties, Leases and Leasehold Interests  

  
 At Closing, Sellers shall execute an Assignment or Assignments in the forms attached collectively hereto as Exhibit 2,
assigning to Buyers all (one hundred percent (100%)) of Sellers’ collective rights, title to and interest in the Producing Properties, including leases, leasehold interests, leasehold rights, exploration rights, mineral rights, all
production rights for oil, natural gas, coalbed methane gas or other hydrocarbons, and all proceeds from the sale of oil. natural gas, coalbed methane gas and other hydrocarbons. The Producing Properties are specifically described and listed in
attachments to Exhibit 2, which attachments consist of legal descriptions of all (one hundred percent (100%)) of these Producing Properties in the state of Texas in which Sellers have an interest, including Properties in Leon and Robertson
Counties in the State of Texas, a portion of which are sometimes referred to as the “Presco” acreage or property, “Hilltop” acreage or property, and “Navasota” acreage or property. The Parties recognize that a few
properties, leases and leasehold interests were acquired, or are in the process of being acquired, at or about the date of the execution of this Agreement which may not appear in Exhibit 2 (“Supplemental Properties”). Sellers shall execute
an Assignment assigning to Buyers all of Sellers collective rights, title to and interests in those Supplemental Properties on or before December 31, 2005. Those Supplemental Properties, and the assignment thereof, from Sellers to Buyers, shall
be governed by this Agreement. 
  

	 	2.5	Sale of Equipment and Fixtures 

  
 At Closing, Sellers shall execute a Bill of Sale, or Bills of Sale, in the forms attached collectively hereto as Exhibit 3 selling and assigning to
Buyers all (one hundred percent (100%)) of Sellers’ collective rights, title to and interest in all equipment, personal property, fixtures, physical facilities, rigs, drilling equipment, collection equipment, pumps, piping, casing, logs,
pipelines, gathering equipment and systems, meters, seismic information, data and records (to the extent assignable without material cost to Sellers, and, if so, Sellers shall provide Buyers an opportunity to pay such material cost) and all other
property and equipment used directly or indirectly for the exploration, production, transmission and sale of oil, natural gas or other hydrocarbons located on or pertaining to said Producing Properties as described in Section 2.4 herein, and
located on or pertaining to the Non Producing Properties, if any (collectively “Equipment and Fixtures”). Exhibit 3 shall contain a schedule or schedules describing the equipment, personal property, fixtures, physical facilities, rigs,
drilling equipment, collection equipment, pumps, piping, casing, logs, pipelines, gathering equipment and systems, meters, seismic information, data, records and all other property and equipment used directly or indirectly for the exploration,
production, transmission and sale of oil, natural gas or other hydrocarbons located on or pertaining to said Producing Properties to be sold, transferred, conveyed and assigned under Section 2.4 and located or pertaining to the Non Producing
Properties, if any (“Equipment and Fixtures”). 
  

	 	2.6	Assignment of Contracts and Agreements 

  
 At Closing, Sellers and Buyers shall execute an “Assignment of Contracts and Agreements” in the form attached hereto as Exhibit 4, assigning to
Buyers all (one hundred percent (100%)) of Sellers’ collective rights, title to, interests in and obligations under all contracts and agreements pertaining to the Producing Properties as described in Section 2.4 herein, including any
joint operating agreements, joint venture agreements, rig agreements, drilling agreements, and agreements pertaining to the collection, gathering, transmission and sale of oil, natural gas or other hydrocarbons and providing for the assumption
thereof by Buyers. Exhibit 4 shall contain a schedule or schedules describing such contracts and agreements related to the Properties. 
  

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	3.	Purchase Price 

  
 In exchange for the assets and interests purchased, transferred, conveyed and assigned by Sellers to Buyers, Buyers shall pay Sellers as follows:

  

	 	3.1	Base Purchase Price 

  
 Buyers shall provide the following to Sellers as the “Base Purchase Price,” subject to the adjustments provided in Section 3.2 et
seq herein (the “Adjusted Base Purchase Price.”) 
  

	 	3.1.1	Cash at Closing At Closing, Buyers shall pay Sellers the sum of Five Million Eight Hundred Seventy Nine Thousand Four Hundred Dollars ($5,879,400) in United States
Dollars (“USD”) by certified check and/or by wire transfer to the account or accounts designated by Sellers. 

  

	 	3.1.2	Intentionally Omitted 

  

	 	3.1.3	Intentionally Omitted 

  

	 	3.2	Adjustments to Purchase Price 

  
 The Base Purchase Price shall be adjusted as provided in this Section 3.2. 
  

	 	3.2.1	The Base Purchase Price shall be increased by the following amounts (without duplication): 

  

	 	(a)	The amount of all capital and operating expenditures paid by Sellers in connection with Sellers’ percentage share of the capital costs and operating costs of the Properties for
the period between the Effective Date and the Closing Date. 

  

	 	(b)	The amount of prepaid expenditures paid by Sellers in connection with Sellers’ percentage share of such prepaid expenses attributable to the Properties for the period between
the Effective Date and the Closing Date. 

  

	 	(c)	The amount of Forty Three Dollars ($43.00) USD per day between the Effective Date and the Closing Date attributable to Sellers’ contribution to general and administrative
overhead expenses for the Properties. 

  

	 	3.2.2	The Base Purchase Price shall be decreased by the following amounts (without duplication): 

  

	 	(a)	The amount of all taxes prorated to Buyers in accordance with Section 10. 

  

	 	(b)	One Hundred (100%) percent of the net proceeds received by Sellers from the production and sale of Sellers’ interest in the coalbed methane gas, natural gas and other
hydrocarbons from the Properties between the Effective Date and the Closing Date. 

  

	 	3.2.3	In accordance with the provisions of Section 11.1, Buyers shall deliver to Sellers a statement (the “Settlement Statement”) within sixty (60) days of the Closing
Date, setting forth the adjustments to the Base Purchase Price as provided in Section 3.2. The Settlement Statement will be prepared in accordance with customary accounting principles used in the oil gas industry and familiar to both Sellers
and Buyers. 

  

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	 	3.2.4	Upon a determination of the Final Settlement Statement pursuant to Section 11, either by mutual agreement or by arbitration, the adjustment to the Base Purchase Price will be
known. If such adjustment to the Base Purchase Price reflects that an amount is due to Sellers, Buyers shall (a) pay fifty percent (50%) of that amount to Sellers in cash in twelve (12) equal monthly payments, commencing three
(3) months from the date of this Agreement, and (b) pay the other fifty percent (50%) of that amount to Sellers within sixty (60) days of the date of this Agreement in shares of Gastar common stock, the number of which shall be
determined by dividing the amount due, converted to Canadian dollars at the then applicable exchange rate, by a price of Four Dollars and Fifty Cents per share in Canadian funds ($4.50/sh) (CDN). For example, if the total adjustment amount is Nine
Million Dollars in Canadian funds ($9,000,000) (CDN), the number of shares of Gastar stock owing would be One Million (1,000,000); ($4,500,000/$4.50 = 1,000,000). If such adjustment to the Base Purchase Price reflects that an amount is due to
Buyers, Sellers shall either (a) reduce the aggregate principal amount due under the Promissory Notes by that amount, or (b) pay such amounts to Buyers in shares of Gastar common stock valued at Four Dollars and Fifty Cents per share in
Canadian funds ($4.50) CDN. 

  

	 	3.3	Look-Back Purchase Price 

  
 In addition to the Base Purchase Price set forth in Sections 3.1.1 to 3.1.3, as adjusted under Sections 3.2.1 to 3.2.4, Buyers shall be responsible to
Sellers for payment of an additional amount, the “Look-Back Purchase Price,” which amount is determined in accordance with the provisions of Section 3.4 et seq. herein. While Sections 3.4, 3.4.1, 3.4.2, 3.4.3,
3.4.4, 4.2, 4.2.1, 4.2.2, 4.2.3 and 4.2.4 appear in both this Agreement and in the “Purchase and Sale Agreement and Assignment of Interests – Texas Non Producing Properties” of even date herewith, Sections 3.4. 3.4.1, 3.4.2, 3.4.3,
3.4.4, 4.2, 4.2.1, 4.2.2, 4.2.3 and 4.2.4 are to be applied only once, in total, for both this Agreement and for that Agreement. 
  

	 	3.4	Determination of Look-Back Purchase Price  

  
 The Look-Back Purchase Price shall be determined and paid as follows: 
  

	 	3.4.1	Determination of 2006 2P Reserves and 2007 2P Reserves. 

  

	 	(a)	2006 2P Reserves. As soon as reasonably practicable following receipt from Netherland Sewell and Associates, Inc. (“NSAI”) of a reserve report reflecting the
proved and probable reserves as of June 30, 2006, for both the Properties and the Texas Non Producing Properties (in either case, whether or not owned by Buyers as of June 30, 2006), but not later than sixty (60) days following
receipt of that report, the Parties shall meet to calculate and agree upon the proven and probable reserves attributable the Texas Properties as of June 30, 2006 (the “2006 2P Reserves”). Notwithstanding the foregoing, Sellers, in
their sole discretion and at their sole cost, may retain an independent, professionally certified reservoir engineering firm to independently make a 2P Reserves determination of the Texas Properties as of June 30, 2006. Such report, if
prepared, shall utilize the same regulatory requirements as does the NSAI final reserve report as of June 30, 2006, being either the Canadian guidelines NI 51-101 regarding reserve estimate and/or the Securities and Exchange Commission and
Society of Petroleum Engineers reserve calculation guidelines. If such report determines that the 2006 2P Reserves for the Texas Properties are greater than the 2006 2P Reserves for those Properties as determined by NSAI, the 2006 2P Reserves shall
be the average of the 2006 2P Reserves determined by NSAI and the 2006 2P Reserves determined by Sellers’ independent reservoir engineering firm. To the extent Buyers sell or 

  

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 farm out any of the Texas Properties prior to June 30, 2006, the proved and probable reserves
attributable to such sold or farmed out properties shall be included in the calculation of 2006 2P Reserves (under the assumption that Sellers’ interest was proportionately reduced through a farm out, if applicable), and each of NSAI and any
independent reservoir engineering firm selected by Sellers shall be permitted to use reasonable assumptions in calculating the amount of such reserves attributable to such sold or farmed out properties as of June 30, 2006. If Buyers sell,
assign, transfer or convey all or substantially all of the Texas Properties before June 30, 2006, or Buyers are merged into or bought by another entity before June 30, 2006, the date of definitive agreement for such sale, transfer or
merger shall be the date on which the Reserve Report shall be determined for purposes of Section 3.4.1(a) and the calculation of 2006 2P Reserves and, nothwithstanding anything to the contrary in this Agreement, there shall be no subsequent
calculation of 2007 2P Reserves or payment of a 2007 Look-Back Payment. 
  

	 	(b)	2007 2P Reserves. As soon as reasonably practicable following receipt from NSAI of a reserve report reflecting the proved and probable reserves as of June 30,
2007, for both the Properties and the Texas Non Producing Properties (in either case, whether or not owned by Buyers as of June 30, 2007), but not later than sixty (60) days following receipt of that report, the Parties shall meet to
calculate and agree upon the proven and probable reserves attributable to the Texas Properties as of June 30, 2007 (the “2007 2P Reserves”). Notwithstanding the foregoing, Sellers, in their sole discretion and at their sole cost, may
retain an independent, professionally certified reservoir engineering firm to independently make a 2P Reserves determination of the Texas Properties as of June 30, 2007. Such report, if prepared, shall utilize the same regulatory requirements
as does the NSAI final reserve report as of June 30, 2007, being either the Canadian guidelines NI 51-101 regarding reserve estimate and/or the Securities and Exchange Commission and Society of Petroleum Engineers reserve calculation
guidelines. If such report determines that the 2007 2P Reserves for the Texas Properties are greater than the 2007 2P Reserves for those Properties as determined by NSAI, the 2007 2P Reserves shall be the average of the 2007 2P Reserves determined
by NSAI and the 2007 2P Reserves determined by Sellers’ independent reservoir engineering firm. To the extent Buyers sell or farm out any of the Texas Properties prior to June 30, 2007, the proved and probable reserves attributable to such
sold or farmed out properties shall be included in the calculation of 2007 2P Reserves (under the assumption that Sellers’ interest was proportionately reduced through a farm out, if applicable), and each of NSAI and any independent reservoir
engineering firm selected by Sellers shall be permitted to use reasonable assumptions in calculating the amount of such reserves attributable to such sold or farmed out properties as of June 30, 2007. If Buyers sell, assign, transfer or convey
all or substantially all of the Texas Properties between June 30, 2006 and June 30, 2007, or Buyers are merged into or bought by another between June 30, 2006 and June 30, 2007, the date of definitive agreement for such sale,
transfer or merger shall be the date on which the Reserve Report shall be determined for purposes of Section 3.4.1(b) and the calculation of 2007 2P Reserves. The 2007 2P Reserves shall be subject to adjustment in accordance with
Section 4.2.2 of the Agreement. 

  

	 	3.4.2	Calculation of Excess Reserves Value.  

  

	 	(a)	2006 Excess Reserves Value. To the extent the 2006 2P Reserves, determined in accordance with the foregoing, are greater than the 2P Reserves attributable to the Texas
Properties transferred and assigned as of December 31, 2004, as 

  

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 determined by the NSAI Report as of December 31, 2004, the volumetric difference between the two
values expressed in mcf, multiplied by $1.50/mcf (USD), shall be referred to as the “2006 Excess Reserves Value.” 
  

	 	(b)	2007 Excess Reserves Value. To the extent the 2007 2P Reserves, determined in accordance with the foregoing, are greater than the 2006 2P Reserves attributable to the
Texas Properties transferred and assigned as of June 30, 2006, as determined by the NSAI Report as of June 30, 2006, the volumetric difference between the two values expressed in mcf, multiplied by $1.50/mcf (USD), shall be referred to as
the “2007 Excess Reserves Value.” 

  

	 	3.4.3	Calculation of Sellers’ Look-Back Costs and Look-Back Payment. The Parties shall determine the “Sellers’ 2006 Look-Back Costs” and the
“Sellers’ 2007 Look-Back Costs;” and the “2006 Look-Back Payment” and “2007 Look-Back Payment” (collectively referred to as the “Look-Back Payments”) as follows: 

  

	 	(a)	2006 Look-Back Payment. At the meeting described in Section 3.4.1(a), the Buyers and Sellers shall determine the amount of Sellers’ net share of capital
costs attributable to the drilling and completion (not including operation and maintenance costs, but inclusive of costs associated with the gathering, processing and sales of production attributable to such wells) for all wells drilled on the Texas
Properties between the Effective Date and June 30, 2006 as if Sellers had not sold, conveyed, transferred or assigned the Texas Properties to Buyers. This determination shall be based upon Sellers’ share of actual costs, as applicable, for
wells drilled and completed, and shall consist of the sum of the following two components: a) Sellers share of Authorizations for Expenditures (“AFEs”) for all wells actually drilled, drilling and/or completed between the Effective Date
and June 30, 2006, including an accrual for capital costs on any wells drilling or being completed at June 30, 2006; b) to the extent Buyers sold or farmed out any of the Texas Properties prior to June 30, 2006 which resulted in a
determination of proved and probable reserves for those sold or farmed out properties which was included in the calculation of 2006 2P Reserves under Section 3.4.1(a), a reasonable estimate of what Sellers’ net share of capital costs would
have been to develop those proved and probable reserves on the sold or farmed out properties. The resultant amount, “Sellers’ 2006 Look-Back Costs,” shall be subtracted from the “2006 Excess Reserves Value” determined under
Section 3.4.2(a) to arrive at the amount of the “2006 Look-Back Payment.” 

  

	 	(b)	2007 Look-Back Payment. At the meeting described in Section 3.4.1(b), the Buyers and Sellers shall determine the amount of Sellers’ net share of capital
costs attributable to the drilling and completion (not including operation and maintenance costs, but inclusive of costs associated with the gathering, processing and sales of production attributable to such wells) for all wells drilled on the Texas
Properties between June 30, 2006 and June 30, 2007 as if Sellers had not sold, conveyed, transferred or assigned the Texas Properties to Buyers. This determination shall be based upon Sellers’ share of actual costs, as applicable, for
wells drilled and completed, and shall consist of the sum of following three components: a) Sellers share of AFEs for all wells actually drilled, drilling and/or completed between June 30, 2006 and June 30, 2007, including an accrual for
capital costs on any wells drilling or being completed at June 30, 2007; b) if applicable, Sellers’ share of prepared AFEs and/or projected AFEs for the drilling and completion of the “look-back gross-up wells,” as defined in
Section 4.2.2; c) to the extent Buyers sold or farmed out any of the Texas Properties prior to June 30, 2007 which resulted in a determination of proved and probable reserves for those sold or farmed out 

  

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 properties which was included in the calculation of 2007 2P Reserves under Section 3.4.1(b), a
reasonable estimate of what Sellers’ net share of capital costs would have been to develop those proved and probable reserves on the sold or farmed out properties. The resultant amount, “Sellers’ 2007 Look-Back Costs,” shall be
subtracted from the “2007 Excess Reserves Value” determined under Section 3.4.2(b) to arrive at the amount of the “2007 Look-Back Payment.” 
  

	 	3.4.4	Delivery and Form of Look-Back Payments. The 2006 Look-Back Payment shall be delivered to Buyers within ten (10) days of final calculation made pursuant to
Section 3.4.3(a). The 2007 Look-Back Payment shall be delivered to Buyers within ten (10) days of final calculation made pursuant to Section 3.4.3(b). To satisfy the Look-Back Payments, Buyers shall provide Sellers with a number of
shares of Gastar common stock determined as follows: The volume weighted five (5) day average trading price of Gastar stock on the TSE (or such other national exchange if, at that time, the shares of Gastar are no longer traded on the TSE), for
the last five (5) trading days preceding the date that the particular Look-Back Payment is to be made shall be determined. That weighted average per share stock price shall then be reduced by ten percent (10%), the discounted per share stock
price. The particular Look-Back Payment shall be divided by the discounted per share stock price to determine the gross number of Look-Back Payment shares. This resultant number constitutes the number of Gastar shares to be transferred from Buyers
to Sellers to satisfy the particular Look-Back Payment. For example, if the particular Look-Back Payment amount is Sixty Million Dollars ($60,000,000) USD, and the weighted average per share price of Gastar stock is Three Dollars and Thirty Three
cents ($3.33) USD, the number of additional shares needed to satisfy the Look-Back Payment amount is Twenty Million (20,000,000) shares; ($60,000,000)/($3.33 - $0.33) = 20,000,000. 

  
 If the calculation performed under this Section 3.4.5
results in a negative number, Sellers shall provide to Buyers that negative number of Gastar shares, expressed as a positive number. For example, if the calculation resulted in a negative One Million (1,000,000) shares, Sellers would provide
One Million (1,000,000) Gastar shares to Buyers. In this circumstance, Buyers may, in their sole discretion, cancel the equivalent number of shares and share certificates held by Sellers in lieu of receipt from Sellers of the shares owing.

  

	4.	Affirmative Covenants of Gastar 

  
 In addition to all other rights, duties and obligations undertaken by it under this Agreement, the LOI and all documents and agreements to be executed in
connection with this Agreement, Gastar affirmatively covenants and agrees as follows: 
  

	 	4.1	Gastar Covenant Concerning Registration Rights Agreement 

  
 At Closing, Gastar and GeoStar shall execute a Registration Rights Agreement in the form attached hereto as Exhibit 6. 
  

	 	4.2	Gastar Covenants Concerning Drilling Obligations 

  

	 	4.2.1	Drilling in Texas. On or before June 30, 2007, Gastar, through itself or its subsidiary and affiliated companies, shall be obligated to drill and spud, and use
good faith efforts to complete, no less than twenty (20) wells on the Texas Properties no less than eighteen (18) of which are to test the Deep Bossier formation and no less than two (2) of which are to test the Travis Peak formation.
For purposes of satisfying this twenty (20) well requirement, the wells currently identified as the Greer #1 well (“Greer #1”) and the Fridkin-Kaufman #2 well (“F-K #2”) shall count as two (2) of those wells. Buyers
agree to continue to provide any and all drilling, completion and production information to 

  

 11 

 Sellers, or Sellers’ assigns, related to the Texas Properties during the period of time up to and
until the final Look-Back” payment is made in full to Sellers. Sellers agree and understand that all information provided by Buyers may continue to be provided through certain on line data sources (such as Pason, Viseo, e-Lynx), or other
sources that Buyers deem prudent and necessary, as well as quarterly reports and updates from the Buyers to Sellers over this period of time. Any such information provided shall be, and shall remain, confidential in nature and Buyers specifically
acknowledge that access to such information will be deemed to be receipt of matieral non-public information. 
  

	 	4.2.2	Deep Bossier Wells If, by June 30, 2007, Gastar has not drilled at least eighteen (18) wells to test the Deep Bossier formation on the Texas Properties
inclusive of the Greer #1 and F-K #2 wells, the 2007 2P Reserves determined under Section 3.4.1 shall be adjusted, and therefore increased, by adding to the 2007 2P Reserves for the proved and probable wells and locations within the NSAI
reserve report effective June 30, 2007 in East Texas, inclusive of Greer #1 and F-K #2, the “look-back gross-up reserves,” calculated as follows: The 2007 2P Reserves for those proved and probable wells and locations within the NSAI
reserve report effective June 30, 2007 (specifically those wells for which 2P Reserves have been at that time derived by NSAI and, if applicable, the qualified independent reservoir engineering firm selected by Sellers), inclusive of Greer #1
and F-K #2, shall be totaled. That total of those 2P Reserves shall be divided by the total number of wells booked in the proved and probable reserve categories by NSAI for which these particular 2P Reserves have been determined. This number shall
be multiplied by the number of “look-back gross-up wells,” defined as the difference between eighteen (18) wells and the number of wells actually drilled and from which the 2P Reserves were derived, inclusive of Greer #1 and F-K #2.
The product of that multiplication, the “look-back gross-up reserves,” shall be added to the 2P Reserves for the proved and probable wells and locations within the NSAI report effective June 30, 2007, inclusive of Greer #1 and F-K #2.
The resultant sum shall be used as the “2007 2P Reserves” for purposes of the calculations required under Section 3.4, specifically Sections 3.4.1 to Section 3.4.5. Thus, for example, if a total of fourteen (14) wells are
actually completed by June 30, 2007 hereunder, inclusive of Greer #1 and F-K #2, the average reserves per well (total of 2P reserves determined for the total number of wells booked in the proved and probable reserve categories by NSAI for which
these particular 2P Reserves have been determined divided by the same total number of wells booked in the proved and probable reserve categories by NSAI for which these particular 2P Reserves have been determined) shall be multiplied by four
(4) (18 wells required minus 14 wells drilled equals 4 “look-back gross-up wells”) and that amount of “look-back gross-up reserves” shall be added to the 2P Reserves for the proved and probable wells and locations within the
NSAI reserve report effective June 30, 2007 for purposes of determining the total 2007 2P Reserves and the 2007 Look-Back Payment for the Texas Properties. 

  

	 	4.2.3	Travis Peak Wells. Among the twenty (20) wells to be drilled by Gastar pursuant to its affirmative covenant contained in Section 4.2 shall be at least two
(2) wells drilled to depths sufficient to test the Travis Peak formation, and attempted to be completed, if deemed commercially reasonable, in the Travis Peak formation in the Hilltop area of East Texas, on Properties to be sold, conveyed,
transferred and assigned hereunder. Said two (2) “Travis Peak” wells shall be drilled and completed on or before June 30, 2007. It is expressly understood and agreed that Gastar may attempt a Travis Peak completion in a well
drilled to test the Bossier formation in order to satisfy the requirements of Section 4.2.3. 

  

	 	4.2.4	Failure to Drill and Test Travis Peak Wells. If Gastar does not drill and test two (2) wells in the Travis Peak formation by June 30, 2007, then Sellers
shall have the right, but not the obligation, to farm in the Travis Peak rights across the AMI defined within the March 15, 2005 JOA for the Hilltop area leasehold under the terms approved at the 

  

 12 

 June 28, 2004 Gastar Board of Directors meeting, attached hereto as Exhibit 7. In the event that Sellers
so elect, they will drill, complete and operate the Travis Peak wells (which may be more than two wells) and carry Gastar for a twenty five (25%) Working Interest (“WI”) in the first two Travis Peak wells so drilled, completed and
operated by Sellers. Gastar will earn a twenty five percent (25%) After Pay Out Back-in Interest (“APO BI”) in the next two Travis Peak wells (i.e., the third and fourth wells) in the event that they are drilled, completed and
operated by Sellers. Beginning with the fifth well in the Travis Peak area, and with respect to each well thereafter, Sellers will have a sixty five percent (65%) WI and shall act as the Operator under the terms with respect to a Joint
Operating Agreement to be executed pertaining to the Travis Peak wells. Gastar will have a thirty five percent (35%) WI in the fifth and subsequent wells, with a right to elect, on a well-by-well basis, to convert its thirty five percent
(35%) WI to twenty five percent (25%) APO BI. In the event Sellers elect to drill, complete and operate the Travis Peak wells, they will have reasonable access to the Travis Peak records of Buyers in accordance with Section 14.2.
Buyers shall use their good faith efforts in cooperating with Sellers in providing such records and data as is reasonably required by Sellers in this regard. Sellers shall be allowed two years to complete their farm in obligations if Buyers fail to
drill and complete the two Travis Peak wells contemplated herein. 
  

	5.	Representations and Warranties of Sellers. 

  
 Each of GeoStar, First Source Texas, Inc., First Source Bossier, LLC, and First Texas Gas, LP, Sellers herein, collectively, individually, jointly and
severally represent and warrant to Buyers as follows. 
  

	 	5.1	Organization 

  
 Such Seller is duly organized validly existing and in good standing under the laws of the state in which it was organized. Such Seller is qualified to do
business in and is in good standing under the laws of each state in which it must be as it pertains to its ownership of the Properties to be sold, transferred, conveyed and assigned hereunder, other than any failure to be so qualified or in good
standing that would not have a material adverse effect (“MAE”) on the Properties to be transferred, considered collectively as a whole. 
  

	 	5.2	Authority and Authorization 

  
 Such Seller has full power and authority to carry on its business as presently conducted, to enter into this Agreement, and to perform its obligations
under this Agreement. The execution and delivery of this Agreement by such Seller has been, and the performance by such Seller of this Agreement and the transactions contemplated hereby, shall be at the time required to be performed hereunder, duly
and validly authorized by all requisite action on the part of such Seller. 
  

 13 

	 	5.3	Enforceability 

  
 This Agreement has been duly executed and delivered on behalf of such Seller and constitutes the legal, valid and binding obligation of such Seller,
enforceable in accordance with its terms, except as enforceability may be limited by applicable bankruptcy, reorganization or moratorium statutes, or other similar laws affecting the rights of creditors generally or equitable principles
(collectively, “Equitable Limitations”). All documents and instruments required hereunder to be executed and delivered by such Seller as appropriate has been duly executed and delivered and constitute legal, valid and binding obligations
of such Seller enforceable in accordance with their terms, except as enforceability may be limited by Equitable Limitations. 
  

	 	5.4	Conflicts 

  
 The execution and delivery of this Agreement by such Seller does not, and the consummation of the transactions contemplated by this Agreement shall not,
(a) violate or be in conflict with, or require the consent of any person or entity under, any provision of such Seller’s governing documents as it pertains to such Seller, (b) violate any provision under any judgment, decree, judicial
or administrative order, award, writ, injunction, statute, rule or regulation applicable to such Seller other than any violation that would not have a MAE, (c) result in the creation of any lien, charge or encumbrance on any of the Properties
to be transferred and assigned hereunder that would have a MAE. 
  

	 	5.5	Contracts 

  
 Exhibit 8 sets forth a list of the following contracts, agreements and commitments to which any of the Properties are or may be bound: (a) any
agreement with any affiliate of such Seller, (b) any agreement or contract of such Seller for the sale, exchange or other disposition of any hydrocarbons, including coalbed methane gas or natural gas, as applicable, produced by such Seller from
the Properties that is not cancelable without penalty on not more than thirty (30) days prior written notice, (c) any agreement of such Seller to sell, lease, farm in, farm out or otherwise dispose of its interests in any of the
Properties, other than conventional rights of reassignment and preferential rights; (d) any operating agreement to which such Seller’s interest in any of the Properties is subject, and (e) any contract that commits such Seller to
expend more than Fifty Thousand Dollars ($50,000) USD in any year in connection with the Properties (“Contracts”). 
  

	 	5.6	Litigation and Claims  

  
 Except as is set forth on Exhibit 9, (a) no claim, demand, filing, investigation, administrative proceeding, action, suit or other legal proceeding
is pending or, to such Seller’s knowledge, is threatened against such Seller with respect to the Properties or the ownership or operation of any thereof, other than proceedings relating to the oil and gas industry generally and as to which such
Seller is not a named party, and (b) no written notice from any governmental authority or any other person (including employees) has been received by such Seller with respect to the Properties claiming of any material violation by such Seller
of any law, rule, regulation, ordinance, order, decision or decree of any governmental authority (including, without limitation, any such law, rule, regulation, ordinance, order, decision or decree concerning the conservation of natural resources).

  

	 	5.7	Approvals and Preferential Rights 

  
 Exhibit 10 contains a complete and accurate list of (a) all approvals and consents required to be obtained by such Seller for the assignment or
transfer of the Properties to Buyers, other than approvals and consents of governmental authorities, that (i) have already been obtained by such Sellers, or (ii) are customarily obtained in similar transactions after the consummation of
the transaction (which Seller represents will be obtained promptly following Closing), and (b) all 
  

 14 

 preferential purchase rights that affect the transactions contemplated by this Agreement. To the extent
that an otherwise required approval and consent is not listed on Exhibit 13, it is because the period of time has lapsed for that individual or entity to have responded, following timely notice provided to them or it, with no response or exercise of
preferential right. 
  

	 	5.8	Compliance with Laws and Permits 

  
 During the period of such Seller’s ownership of the Properties, to such Seller’s knowledge, except as set forth elsewhere in this Agreement or
in the Exhibits to this Agreement, those Properties have been and currently are operated, and such Seller and those Properties are, in compliance with the provisions and requirements of all laws, rules, regulations, ordinances, orders, decisions and
decrees of all governmental authorities having jurisdiction with respect to those Properties or the ownership or operation of any thereof, except where noncompliance would not have, individually or in the aggregate, a MAE. All necessary governmental
permits, licenses and other authorizations with regard to the ownership or operation of those Properties have been obtained and maintained in effect, except where the failure to obtain or maintain such permits, licenses and other authorizations
would not have, individually or in the aggregate, a MAE. No violations exist in respect of such permits, licenses or other authorizations, except for violations that would not have, individually or in the aggregate, a MAE. 
  

	 	5.9	Environmental Compliance  

  
 During the period of such Seller’s ownership of the Properties to such Seller’s knowledge, except as set forth on Exhibit 11, no pollutant,
waste, contaminant, or hazardous, extremely hazardous, or toxic material, substance, chemical or waste identified, defined or regulated as such under any law relating to health and safety or environmental matters is present, or has been handled,
managed, stored, transported, processed, treated, disposed of, released, migrated or has escaped on, in, from, under or in connection with those Properties or the ownership or operation thereof such as to cause a condition or circumstance that
results in a violation of any law relating to health and safety or environmental matters or in a remediation, removal, response, restoration, abatement, investigative or monitoring obligation, other than violations or obligations that (a) were
not the result of any action or omission by such Seller or (b) would not have, individually or in the aggregate, a MAE. Seller shall also identify separately in Exhibit 11 those circumstances known to such Seller which would have been listed
but for subsections (a) and (b) of this Section. 
  

	 	5.10	Status of Contracts 

  
 All of the Contracts to be transferred and assigned hereunder to which such Seller is bound, are in full force and effect, and such Seller is not in
breach of, or with the lapse of time or the giving of notice, or both, would be in breach of any of its material obligations thereunder, and consummation of the transactions contemplated hereunder will not result in such a breach. 
  

	 	5.11	Production Burdens, Taxes, Expenses and Revenues 

  
 All payments due under or with respect to the Properties have been properly and timely paid when due, or funds have been set aside for such purpose. All
ad valorem, property, production, severance and other taxes based on or measured by such Seller’s ownership of those Properties or the production of hydrocarbons, including coalbed methane gas or natural gas, as applicable, therefrom have been
properly and timely paid when due. All expenses payable under the terms of the Contracts attributable to such Seller have been properly and timely paid when due, except for such expenses as are being currently paid prior to delinquency in the
ordinary course of business. All of the proceeds from the sale of any hydrocarbons, including coalbed methane gas or natural gas, as applicable, are being properly and timely paid when due to such Seller, as appropriate, by the purchasers of
production without suspension or indemnity other than standard division order indemnities. To the best of such Seller’s knowledge, there were no gas imbalances relating to the Properties to be transferred and assigned as of the Effective Date.

  

 15 

	 	5.12	Current Commitments 

  
 Exhibit 12 contains a true and complete list, as of the Closing Date, of all AFEs approved by such Seller to drill or rework wells or for material
capital expenditures pursuant to any of the Contracts for which all of the activities anticipated in such authorities for material expenditures or material commitments have not been completed by the Closing Date and having a remaining expenditure
obligation in excess of Fifty Thousand Dollars ($50,000.00) USD each. 
  

 16 

	 	5.13	Liens and Encumbrances 

  
 During such Seller’s ownership of the Properties, and to the best of such Seller’s knowledge for those periods when Sellers did not own the
Properties, except for Permitted Encumbrances or as shown on Exhibit 13, there are no material liens or encumbrances (except for those of record) burdening those Properties. 
  

	 	5.14	Good and Defensible Title 

  
 If the Closing occurs, then effective as of the Closing Date, such Seller warrants good and defensible title to the Producing Properties sold, conveyed,
transferred and assigned by such Seller unto Buyers hereunder against any person lawfully claiming the same by, through or under such Seller, but not otherwise, subject, however to the Permitted Encumbrances, to any matters of record and as shown on
Exhibit 13. 
  

	 	5.15	Trade Payables 

  
 All trade payables incurred by or on behalf of such Seller with respect to the Properties, Equipment and Fixtures have been paid in full, or will have
been paid in full by or on behalf of such Seller by the Closing Date. There are no claims, actions or lawsuits outstanding, pending or, to the Knowledge of Sellers, threatened by any trade creditor with respect to the Properties, Equipment
and Fixtures including, without limitation, of those creditors related to the sale or lease of Properties, the exploration, production, transmission or sale of coalbed methane gas, natural gas or other hydrocarbon products, the sale or lease of
assets, or the provision of services. 
  

	 	5.16	Sellers’ Knowledge 

  
 As used herein, “Sellers’ knowledge” or the “Knowledge of Sellers” means the actual knowledge of Thom Robinson, John Parrott,
Tony Ferguson, Frederick Lambert, Milton Evans, Lundin Schneider or Brian Wert. 
  

	6.	Representations and Warranties of Each Buyer 

  
 Each of Gastar, First Texas Development, Inc., Bossier Basin, LLC., and First Source Gas, LP, Buyers herein, represent and warrant to Sellers as follows:

  

	 	6.1	Organization 

  
 Such Buyer is duly organized, validly existing and in good standing under the laws of the state, or, in the case of Gastar, Canadian province, in which
such Buyer was organized. 
  

 17 

	 	6.2	Authorization and Authority 

  
 The execution and delivery of this Agreement and the performance of this Agreement and the transactions contemplated hereby has been duly and validly
authorized by all requisite corporate action on the part of such Buyer. Such Buyer has full power and authority to carry on its business as presently conducted, to enter into this Agreement, to purchase as appropriate the Properties to be
transferred and assigned hereunder on the terms described in this Agreement, and to perform its other obligations under this Agreement. All of the shares of Gastar common stock to be issued to Sellers hereunder are duly authorized and, upon
issuance, will be fully paid and non assessable and free of liens, encumbrances and preemptive rights except, and subject to, the restrictive legends that are required to be placed on said shares of stock. 
  

	 	6.3	Enforceability 

  
 This Agreement has been duly executed and delivered on behalf of such Buyer, and constitutes a legal, valid and binding obligation of such Buyer
enforceable in accordance with its terms, except as enforceability may be limited by Equitable Limitations. All documents required hereunder to be executed and delivered by such Buyer have been duly executed and delivered and constitute the legal,
valid and binding obligations of such Buyer enforceable in accordance with their terms, except as enforceability may be limited by Equitable Limitations. 
  

	 	6.4	Conflicts 

  
 The execution and delivery of this Agreement by such Buyer does not, and the consummation of the transactions contemplated by this Agreement shall not,
(a) violate or be in conflict with, or require the consent of any person or entity under, any provision of such Buyer’s governing documents, (b) conflict with, result in a breach of, constitute a default (or an event that with the
lapse of time or notice, or both, would constitute a default) under any agreement or instrument to which such Buyer is a party or is bound, or (c) violate any provision of or require any consent, authorization or approval under any judgment,
decree, judicial or administrative order, award, writ, injunction, statute, rule or regulation applicable to such Buyer, other than any violation that would not have a MAE. 
  

	 	6.5	Reliance 

  
 Such Buyer has been afforded an opportunity to (a) examine the Properties to be transferred and assigned hereunder and such materials as it has
requested to be provided to it by Sellers, (b) discuss with representatives of Sellers such materials and the nature and operation of those Properties and (c) investigate the condition of the Properties. In entering into this Agreement,
such Buyer has relied solely on the express representations and covenants of Sellers in this Agreement or in the Assignments delivered in connection herewith, its independent investigation of, and judgment with respect to, these Properties and the
advice of its own legal, tax, economic, environmental, engineering, geological and geophysical advisors, and not on any comments or statements of any representatives of, or consultants or advisors engaged by, Sellers or the persons representing
Sellers. 
  

	 	6.6	Qualified Leaseholder 

  
 Such Buyer meets the area-wide bonding and any other bonding requirements of the relevant Bureaus of Land Management, Texas Railroad Commission, and
other governmental authorities, and, after the Closing, such Buyer anticipates that it will continue to be able to meet such bonding requirements. Such Buyer is, and, after the Closing, expects to continue to be, otherwise qualified to own, and
assume operatorship of, the Properties. 
  

 18 

	 	6.7	Litigation and Claims 

  
 There is no action, suit, proceeding, claim or investigation by any person, entity, administrative agency or governmental body pending or, to such
Buyer’s knowledge, threatened against it before any governmental authority that impedes, or is likely to impede, its ability to consummate the transactions contemplated by this Agreement. 
  

	 	6.8	Buyers’ Knowledge 

  
 As used herein, “Buyers’ knowledge” or “Knowledge of Buyers,” means the actual knowledge by J. Russell Porter or Michael
Gerlich. 
  

	7.	Covenants 

  

	 	7.1	Covenant of Sellers 

  
 Each Seller covenants that it will make or give all notifications, filings, consents and approvals, from, to or with all governmental authorities, and
take all actions reasonably requested by Buyers, necessary for, and cooperate with Buyers in obtaining, the issuance, assignment or transfer, as the case may be, by each such authority of such permits or other governmental approvals as may be
necessary for Buyers to own and operate the Properties following the consummation of the transactions contemplated in this Agreement. 
  

	 	7.2	Covenant of Buyers 

  
 In addition to the specific affirmative covenants of Buyer Gastar set forth in Section 4, Buyers, if required by Sellers, shall deliver to Sellers
evidence of the posting of bonds or other security with the Bureau of Land Management, Texas Railroad Commission, State of Texas, and all other applicable governmental authorities, meeting the requirements of those authorities to own and, where
appropriate, operate the Properties. 
  

	 	7.3	Cooperation 

  
 Buyers shall use their individual and collective commercially reasonable efforts to cooperate with Sellers to obtain any such consents or authorizations
necessary to complete the transactions contemplated by this Agreement. 
  

	8.	Intentionally Omitted 

  

	9.	Closing and Closing Deliveries 

  

	 	9.1	The Closing Date 

  
 The sale, conveyance, transfer and assignment of the Producing and Non Producing Properties and related assets pursuant to this Agreement shall be
consummated on June 16, 2005, or as soon thereafter as is reasonably practicable, (“Closing Date”) at 11:00 a.m. in Gastar’s office in Houston, Texas, or at some other location mutually agreeable to the Parties. 
  

	 	9.2	Documents to be Delivered at Closing 

  

	 	9.2.1	On the Closing Date, Sellers shall deliver to Buyers the following instruments, properly executed by authorized officers and, where appropriate, acknowledged:

  

	 	(a)	This Agreement. 

  

	 	(b)	The Assignment provided for in Section 2.4. 

  

 19 

	 	(c)	The Bill of Sale provided for in Section 2.5. 

  

	 	(d)	The Assignments of Contracts and Agreements provided for in Section 2.6. 

  

	 	(e)	Such other instruments as are necessary to effect the conveyances of the Properties and interests to Buyers, as requested by Buyers or their counsel. 

  

	 	(f)	An assignment to Buyers of Sellers’ rights as Operator under the Operating Agreement, either directly or through an affirmative vote, and all fully executed forms, promulgated
by the appropriate governmental authority designating Buyers as the Operator under that JOA. 

  

	 	(g)	Sellers shall deliver on forms supplied by Buyers and reasonably acceptable to Sellers transfer orders or letters in lieu thereof directing all purchasers of production to make
payments to Buyers of proceeds attributable to production from the Producing Properties from and after the Effective Date, for delivery by Buyers to the purchasers of production. 

  

	 	(h)	The Registration Rights Agreement provided for in Section 4.1. 

  

	 	(i)	The amounts held in suspense by Sellers, with a schedule listing all suspense accounts, as provided for in Section 10.4 

  

	 	9.2.2	At the Closing, Buyers shall deliver to Sellers the following instruments, properly executed by authorized officers and, where appropriate, acknowledged: 

 

	 	(a)	This Agreement. 

  

	 	(b)	Gastar shares as provided for in Section 3.1.3. 

  

	 	(c)	The Registration Rights Agreement provided for in Section 4.1. 

  

	 	(d)	Such other instruments as are necessary to effectuate the transactions contemplated herein, as requested by Sellers or their counsel. 

  

	 	9.3	Payment of Base Purchase Price 

  
 At the Closing, contemporaneously with the delivery of the documents and materials described in Section 9.2 Buyers shall provide to Sellers or
Sellers designee the amount of Five Million Eight Hundred Seventy Nine Thousand Four Hundred Dollars ($5,879,400) USD by certified check or wire transfer of immediately available funds as required by Section 3.1.1. 
  

	10.	Taxes, Prorations and Assumption of Obligations 

  

	 	10.1	Tax Prorations 

  
 Real and personal property taxes for the Properties shall be prorated between Buyers and Sellers as of the Effective Date. If the actual taxes are not
known on the Closing Date, Sellers’ share of such taxes shall be determined by using (a) the rates and mileage for the year prior to the year in which the Closing occurs, with appropriate adjustments for any known and verifiable
changes thereto, and (b) the assessed values for the year in which Closing occurs. When Buyers receive the actual tax statements for the Properties from the appropriate taxing authorities, Buyers shall deliver to Sellers a copy of such
statements, together with the amount, if any, by which Sellers’ proration exceeds the proration that would have been made had actual tax statements been used to calculate Sellers’ proration. If the proration for Sellers that would have
been made using actual tax statements exceeds that made at Closing, Sellers shall pay to Buyers such difference within three Business Days of receipt of such statement. 
  

 20 

	 	10.2	Severance and Ad Valorem Taxes 

  
 Sellers represent that they have paid all ad valorem and severance taxes attributable to the production from the Properties that have been assessed or
incurred or have become due and payable before the Effective Date, other than taxes that have been contested in good faith. 
  

	 	10.3	Assumption of Obligations 

  
 As of the Effective Date, Buyers assume their share of (a) the obligation to (i) plug and abandon or remove and dispose of all wells,
structures, flow lines, pipelines, and the other equipment now or hereafter located on the Properties (ii) cap and bury all flow lines and other pipelines now or hereafter located on the Properties, and (iii) dispose of naturally occurring
radioactive material and all other pollutants, wastes, contaminants, or hazardous, or extremely hazardous, or toxic materials, substances, chemicals or wastes now or hereafter located on the Properties; (b) all obligations and liabilities
arising from or in connection with any gas production, gas compression, gathering and transmission agreements attributable to coalbed methane gas or natural gas, as applicable, producing from the Properties, whether before, on or after the Effective
Date; and (c) all other costs, obligations and liabilities that arise under the Properties or Contracts or otherwise relate to the Properties and, in each case, arise from or relate to events occurring or conditions existing on or after the
Effective Date or accrue after the Effective Date. All such plugging, replugging, abandonment, removal, disposal, and restoration operations shall be in compliance with applicable laws and regulations and contracts, and shall be conducted in a good
and workmanlike manner. Buyers assume no other obligations than those set forth herein and in any Assignments, Bills of Sale and other documents of conveyance and assumption executed by Buyers hereunder. 
  

	 	10.4	Suspense Accounts 

  
 On the Closing Date, Sellers shall deliver to Buyers all amounts held in suspense by Sellers that relate to Properties to be sold, conveyed, transferred
and assigned at Closing, together with a schedule listing all suspense accounts. Upon receipt thereof from Sellers, Buyers shall assume responsibility for and apply such funds in a manner consistent with prudent oil and gas business practices.
Buyers hereby indemnify and hold harmless Sellers for any Liability arising from such suspense accounts. 
  

	11.	Accounting 

  

	 	11.1	Settlement Statement 

  
 In accordance with Section 3.2.4 as soon as practicable and, in any event, no later than sixty (60) calendar days after the Closing Date,
Buyers shall prepare and deliver to Sellers the Settlement Statement setting forth the adjustments to the Base Purchase Price. The Settlement Statement shall be prepared in accordance with customary accounting principles used in the oil and gas
industry. Within thirty (30) calendar days after Sellers’ receipt of the Settlement Statement, Buyers and Sellers shall endeavor to agree on the accounting set forth therein. 
  

	 	11.2	Arbitration of Final Settlement Statement 

  
 If Sellers and Buyers cannot agree upon the Settlement Statement, a certified independent, nationally recognized public accounting firm, selected
mutually by the Parties, shall serve as an arbitrator and decide all points of disagreement with respect to the Settlement Statement, such decision to be binding on both parties. If the parties are unable to agree upon the designation of an
arbitrator, then the arbitration, including the selection of an arbitrator, shall be conducted under the 
  

 21 

 rules of the American Arbitration Association to the extent such rules do not conflict with the terms
hereof. The costs and expenses of the arbitrator shall be shared equally by Sellers and Buyers. 
  

	 	11.3	Payment 

  
 Within five (5) Business Days after the agreement of Sellers and Buyers on the Settlement Statement, or after the decision of the arbitrator, Buyers
or Sellers, as the case may be, shall, consistent with and subject to the provisions of Section 3.2.4, determine the manner in which they will pay the sums as may be found due under the Settlement Statement. 
  

	12.	Survival and Indemnification. 

  

	 	12.1	Survival 

  
 The liability of Buyers and Sellers under each of their respective representations and warranties contained in this Agreement shall survive for two
(2) years from the Effective Date. Any limitations or conditions to said representations and warranties which are reflected in the Exhibits, or which were determined in pre-Closing due diligence investigation, shall be considered to be
incorporated into the representations and warranties. 
  

 22 

	 	12.2	Liabilities 

  
 The term “Liabilities” shall mean any and all payments, charges, judgments, assessments, liabilities, damages, penalties, fines or costs and
expenses paid or incurred by the person seeking indemnification, including any legal or other expenses reasonably incurred in connection therewith. 
  

	 	12.3	Indemnification by Sellers 

  
 After the Closing, Sellers shall be responsible for, shall pay on a current basis, and shall indemnify, save, hold harmless, discharge and release
Buyers, all of their affiliates, successors and permitted assignees, and all of their respective stockholders, directors, officers, employees, agents and representatives (collectively, “Buyer Indemnified Parties”) from and against their
share of any and all Liabilities arising from, based upon, related to or associated with (a) any act, omission or event involving or relating to the Properties occurring during the period beginning at which Sellers first had a percentage
interest in the Properties and ending as of the Effective Date, other than obligations and liabilities assumed by Buyer pursuant to Section 10.3; (b) any act or omission by Sellers involving or relating to the Excluded Assets whether
occurring before or after the Effective Date; (c) the material inaccuracy of any representation or warranty of Sellers set forth in this Agreement or in any other agreement, instrument, document or certificate executed or delivered in
connection with this Agreement; (d) the material breach of, or failure to, perform or satisfy, any of the covenants of Sellers set forth in this Agreement or in any other agreement, instrument, document or certificate executed or delivered in
connection with this Agreement; and (e) any liability of Sellers not assumed by Buyers hereunder. Notwithstanding the foregoing, the Indemnification obligations of Sellers hereunder is limited by and subject to the time limitations set forth in
Section 12.1, “Survival.” 
  

	 	12.4	Indemnification by Buyers 

  
 After the Closing, Buyers shall be responsible for, shall pay on a current basis, and shall indemnify, save, hold harmless, discharge and release
Sellers, all of their affiliates, successors and permitted assignees, and all of their respective stockholders, directors, officers, employees, agents and representatives (collectively, “Seller Indemnified Parties”) (Buyer Indemnified
Parties and Seller Indemnified Parties sometimes collectively referred to as “Indemnified Parties”) from and against any and all Liabilities arising from, based upon, related to or associated with (a) any act, omission or event
involving or relating to the Properties first occurring after the Effective Date or assumed by Buyer pursuant to Section 10.3; (b) the material inaccuracy of any representation or warranty of Buyers set forth in this Agreement or in any
other agreement, instrument, document or certificate executed or delivered in connection with this Agreement; (c) the material breach of, or failure to, perform or satisfy, any of the covenants of Buyers set forth in this Agreement or in any
other agreement, instrument, document or certificate executed or delivered in connection with this Agreement; and (d) any liability of Buyers not assumed by Sellers hereunder. Notwithstanding the foregoing, the Indemnification obligations of
Buyer hereunder is limited by and subject to the time limitations set forth in Section 12.1, “Survival.” 
  

	 	12.5	Liability Limitations 

  

	 	12.5.1	Any assertion by any Buyer Indemnified Parties that any Seller is liable (a) for the material inaccuracy of any representation or warranty; (b) for indemnity under the
terms of this Agreement; or (c) otherwise in connection with the transactions contemplated in this Agreement, must be provided by written notice and must be given to the other Party or Parties on or prior to the second anniversary of the
Closing Date. Any assertion by any Seller Indemnified Parties that any Buyer is liable (a) for the material inaccuracy of any representation or warranty; (b) indemnity under the terms of the Agreement; or (c) otherwise in connection
with the transactions contemplated in the Agreement, must be provided by written notice. The notice shall state the facts known that give rise to such notice in sufficient detail to allow the other Party or Parties to evaluate the assertion.

  

 23 

	 	12.5.2	None of the Buyer Indemnified Parties shall be entitled to assert any right to indemnification hereunder or to otherwise seek any damages or other remedies for or in connection with
this Agreement or the transactions contemplated in this Agreement until the aggregate amount of the Liabilities actually suffered exceeds five percent (5%) of the Base Purchase Price, and then only to the extent of such excess.

  

	 	12.5.3	The amount of any Liabilities for which any of the Indemnified Parties is entitled to indemnification or other compensation under this Agreement or in connection with or with
respect to the transactions contemplated in this Agreement shall be reduced by any corresponding (a) tax benefit created or generated or (b) insurance proceeds realized or that could reasonably be expected to be realized by such party if a
claim were properly pursued under the relevant insurance arrangements. 

  

	 	12.5.4	Absent fraud or intentional misconduct, Sellers shall not be required to indemnify any Buyer Indemnified Parties or pay any other amount in connection with this Agreement or with
respect to the transactions contemplated in this Agreement in amounts exceeding in the aggregate fifty percent (50%) of the Base Purchase Price. 

  

	 	12.5.5	None of the Indemnified Parties shall be entitled to recover any amount for any losses, costs, expenses, or damages arising under this Agreement or in connection with or with
respect to the transactions contemplated in this Agreement in excess of the actual compensatory damages, court costs and reasonable attorney fees, suffered by such party. Buyers on behalf of each of the Buyer Indemnified Parties and Sellers on
behalf of each of the Seller Indemnified Parties waive any right to recover punitive, special, exemplary and consequential damages arising in connection with or with respect to the transactions contemplated in this Agreement.

  

	 	12.5.6	The sole and exclusive remedy of each of the Indemnified Parties with respect to this Agreement and the Transactions contemplated hereby shall be pursuant to the express
indemnification provisions of this Section 12. Any and all (a) claims relating to the representations, warranties, covenants and agreements contained in this Agreement, (b) other claims pursuant to or in connection with this Agreement
or (c) other claims relating to the Properties and the purchase and sale thereof shall be subject to the provisions set forth in this Section 12. Except for claims made pursuant to the express indemnification provisions of this
Section 12, Buyers on behalf of each of the Buyer Indemnified Parties and Sellers on behalf of each of the Seller Indemnified Parties shall be deemed to have waived, to the fullest extent permitted under applicable law, any right of
contribution against the other Party or any of its affiliates and any and all rights, claims and causes of action it may have against the other Party or any of its affiliates, arising under or based on any federal, state or local statute, law,
ordinance, rule or regulation or common law or otherwise. 

  

	 	12.5.7	No person entitled to indemnification hereunder or otherwise to damages in connection with or with respect to the transactions contemplated in this Agreement shall settle,
compromise or take any other action with respect to any claim, demand, assertion of liability or legal proceeding that could prejudice or otherwise adversely impact the ability of the person providing such indemnification or potentially liable for
such damages to defend or otherwise settle or compromise with respect to such claim, demand, assertion of liability or legal proceeding. 

  

	 	12.5.8	Sellers and Buyers acknowledge that the payment of money, as limited by terms of this Agreement, shall be adequate compensation for breach of any representation, warranty, covenant
or agreement contained herein. 

  

 24 

	 	12.5.9	Each person entitled to indemnification hereunder or otherwise to damages in connection with the transactions contemplated in this Agreement shall take all reasonable steps to
mitigate all losses, costs, expenses and damages after becoming aware of any event or circumstance that could reasonably be expected to give rise to any losses, costs, expenses and damages that are indemnifiable or recoverable hereunder or in
connection herewith. 

  

	 	12.5.10	At the option of any Seller, any amounts due and payable by such Seller to any Buyer under this Article 12 may be paid by such Seller (1) in cash; (2) by setting off an
equal amount payable by Buyers pursuant to the Promissory Notes; (3) by delivering to Buyers a number of shares of Gastar common stock with a value equal to the amount payable by Seller, which with the number of shares determined by dividing
the amount due by the volume weighted five (5) day average trading price of Gastar stock on the Toronto Stock Exchange (“TSE”) for the period of the last five (5) trading days on the TSE prior to the date the amount due is
finally determined. For example, if the amount due is Six Million Dollars ($6,000,000) (USD), and the volume weighted five (5) day average trading price of Gastar stock on the TSE is Three Dollars ($3.00) per share (USD), the number of shares
of Gastar stock due would be Two Million (2,000,000); ($6,000,000/$3.00 = 2,000,000); or (4) by any combination of the foregoing. 

  

	 	12.5.11	THE INDEMNIFICATION, RELEASE AND ASSUMPTION PROVISIONS PROVIDED FOR IN THIS AGREEMENT SHALL BE APPLICABLE WHETHER OR NOT THE LOSSES, COSTS, EXPENSES AND DAMAGES IN QUESTION AROSE IN
WHOLE OR IN PART FROM THE ACTIVE, PASSIVE OR CONCURRENT NEGLIGENCE, STRICT LIABILITY OR OTHER FAULT OF ANY INDEMNIFYING PARTY. BUYERS AND SELLERS ACKNOWLEDGE THAT THIS STATEMENT COMPLIES WITH THE EXPRESS NEGLIGENCE RULE AND IS CONSPICUOUS.

  

	 	12.5.12	Sellers shall not have any obligation or liability under this Agreement or in connection with or with respect to the transactions contemplated in this Agreement for any
(i) breach, misrepresentation or noncompliance with respect to any representation, warranty, covenant, or obligation or (ii) any indemnity (a) if such breach, misrepresentation, noncompliance or indemnity rights shall have been waived
by Buyers, (b) if Buyers had knowledge of the relevant facts at or before Closing or (c) if Buyers should have known, in the exercise of reasonable diligence, of the relevant facts at or before Closing. 

  

	 	12.6	Waiver of Representations 

  

	 	12.6.1	THE EXPRESS REPRESENTATIONS OF SELLERS CONTAINED IN THIS AGREEMENT ARE EXCLUSIVE AND ARE IN LIEU OF ANY OTHER REPRESENTATION OR WARRANTY WITH RESPECT TO THE ENVIRONMENTAL CONDITION,
BOTH SURFACE AND SUBSURFACE, OR OTHER CONDITION OF THE PROPERTIES; OR THE OWNERSHIP OR OPERATION OF THE PROPERTIES OR ANY PART THEREOF OR ANY OTHER MATTERS. 

  

	 	12.6.2	SELLERS EXPRESSLY DISCLAIM AND NEGATE, AND BUYERS HEREBY WAIVE, ANY LIABILITY OR RESPONSIBILITY FOR, (I) ANY REPRESENTATION OR WARRANTY WITH RESPECT TO THE QUALITY, QUANTITY OR
VOLUME OF THE RESERVES, IF ANY, OF GAS OR OTHER HYDROCARBONS IN OR UNDER THE PROPERTIES; AND (II) ANY WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, AS TO THE QUALITY, MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, CONFORMITY TO SAMPLES, OR
CONDITION OF ANY OF THE PROPERTIES OR ANY PART THERETO. 

  

 25 

	 	12.6.3	EXCEPT FOR THE EXPRESS REPRESENTATIONS CONTAINED IN THIS AGREEMENT, THE ITEMS OF EQUIPMENT, PERSONAL PROPERTY, FIXTURES, PHYSICAL FACILITIES, RIGS, DRILLING EQUIPMENT, COLLECTION
EQUIPMENT, PUMPS, CASING, IMPROVEMENTS, FIXTURES AND APPURTENANCES CONVEYED AS PART OF THE PROPERTIES ARE SOLD, AND BUYER ACCEPTS SUCH ITEMS “AS IS, WHERE IS, WITH ALL FAULTS.” 

  

	 	12.6.4	BUYERS ACKNOWLEDGE THAT THE WAIVERS IN THIS SECTION 12.6 ARE CONSPICUOUS. 

  

	13.	Further Assurances. 

  

	 	13.1	General 

  
 After the Closing, Sellers and Buyers shall execute, acknowledge and deliver or cause to be executed, acknowledged and delivered such instruments and
take such other action as may be necessary or advisable to carry out their obligations under this Agreement and under any exhibit, document, certificate or other instrument delivered pursuant hereto. 
  

	 	13.2	Like-Kind Exchange 

  
 Either of Sellers and Buyers may consummate (and the other Parties represent and commit that they shall reasonably cooperate with) the sale/acquisition
of the Properties as part of a so-called like kind exchange (the “Exchange”) pursuant to Section 1031 of the Internal Revenue Code of 1986, as amended, provided that; (i) the Closing shall not be delayed or affected by reason of
the Exchange, nor shall the consummation or accomplishment of the Exchange be a condition precedent or condition subsequent to any party’s obligations under this Agreement; and (ii) no Party shall be required to acquire or hold title to
any real property for purposes of consummating the other party’s Exchange; and (iii) neither Party shall incur any cost or liability in connection with the other Party’s exchange. No Party shall, by this Agreement or acquiescence to
the other Party’s Exchange, have its rights under this Agreement affected or diminished in any manner or be responsible for compliance with or be deemed to have warranted to the other party that any Exchange in fact complies with
Section 1031 of the Internal Revenue Code of 1986, as amended. 
  

	 	13.3	Filings, Notices and Certain Governmental Approvals 

  
 Promptly after Closing Buyers shall (a) record the assignments of the Properties executed at the Closing in all applicable real property records,
(b) send notices to vendors supplying goods and services for the Properties of the assignment of the Properties to Buyers and of the designation of Buyer as the Operator of the Texas Properties thereof, (c) actively pursue the
unconditional approval by the Texas Railroad Commission, state of Texas, and all other applicable governmental authorities of the assignment of the Properties to Buyers and the designation of Buyers as the operator thereof, and (d) actively
pursue all other consents and approvals that may be required in connection with the assignment of the Properties to Buyers, and the assumption of the liabilities assumed by Buyers hereunder, and that shall not have been obtained prior to Closing.
Buyers obligate themselves to take any and all action required by the Texas Railroad Commission, state of Texas, or any other regulatory agency in order to obtain such unconditional approval, including but not limited to, the posting of any and all
bonds or other security that may be required in excess of its existing lease, pipeline or area-wide bond. 
  

	14.	Access to Records after Closing 

  

	 	14.1	Access by Buyers 

  
 After the Closing Date, Buyers and their authorized representatives shall have reasonable access (at Buyers’ sole cost and expense) during
Sellers’ normal business hours to all books and records 
  

 26 

 of Sellers pertaining to the Properties for periods prior to the Effective Date for the purpose of
prosecuting or defending claims, lawsuits or other proceedings, for audit purposes, or to comply with legal process, rules, regulations or orders of any governmental authority. Buyers at their sole expense, may copy such records they deem
appropriate. Sellers agree to maintain such books and records for a minimum of seven (7) years after Closing. 
  

	 	14.2	Access by Sellers 

  
 After the Closing Date, Sellers and their authorized representatives shall have reasonable access (at Seller’s sole cost and expense) during
Buyers’ normal business hours to all books and records in the possession of Buyers (to the extent that Sellers have not retained a copy thereof) pertaining to the Properties for periods from the Effective Date for the purpose of prosecuting or
defending claims, lawsuits or other procedures, for audit purposes, or to comply with legal process, rules, regulations or orders of any governmental authority. Sellers at their own expense may copy such records as they deem appropriate. Buyers
agree to maintain such books and records for a minimum of seven (7) years after Closing.Buyers shall provide Sellers with a description and listing of the actual costs incurred by Buyers attributable to the drilling and completion of wells on
the Texas Properties, including supporting data and records reasonably requested by Sellers. These cost amount reports shall be provided every quarter for those costs actually incurred by Buyers attributable to the drilling and completion of wells
on the Texas Properties in the previous quarter. 
  

	15.	Notices 

  
 All notices required or permitted under this Agreement shall be in writing and, (a) if by air courier, shall be deemed to have been given one
Business Day after the date deposited with a recognized carrier of overnight mail, with all freight or other charges prepaid, (b) if by telecopier, shall be deemed to have been given when actually received, and (c) if mailed, shall be
deemed to have been given three Business Days after the date when sent by registered or certified mail, postage prepaid, addressed as follows: 
  

			
	 To Buyers:
	    	Gastar Exploration, Ltd.
	 	    	First Texas Development, Inc.
	 	    	Bossier Basin, LLC
	 	    	First Source Gas, LP
	 	    	1331 Lamar, Suite 1080
	 	    	Houston, Texas 77010
	 	    	Attn: J. Russell Porter, President and Chief Executive Officer
	 	    	Telecopier: (713) 739-0458
		
	 To Sellers:
	    	Geostar Corporation
	 	    	First Source Texas, Inc.
	 	    	First Source Bossier, LLC
	 	    	First Texas Gas, LP
	 	    	2480 W. Campus Drive, Building C
	 	    	Mt. Pleasant, MI 48858
	 	    	Attn: Thom Robinson, President
	 	    	Telecopier: (989) 773-0006
		
	 To Counsel:
	    	William R. Jansen, Esq.
	 	    	Warner Norcross & Judd LLP
	 	    	2000 Town Center, Suite 2700
	 	    	Southfield, Michigan 48075
	 	    	Telecopier: (248) 784-5150

  

 27 

	16.	Assignment 

  
 Except as necessary to effect an Exchange as contemplated by Section 13.2, neither Sellers nor Buyers may assign their rights or delegate their
duties or obligations arising under this Agreement, in whole or in part, by operation of law or otherwise, before or after Closing, without the prior written consent of the other Party, which consent shall not be unreasonably withheld. 

 

	17.	Governing Law 

  
 This Agreement shall be governed and construed in accordance with the laws of the State of Michigan without giving effect to any principles of conflicts
of laws. The validity of the various conveyances affecting title to real property shall be governed by and construed in accordance with the laws of the jurisdiction in which such property is situated. The representations and warranties contained in
such conveyances and the remedies available because of a breach of such representations and warranties shall be governed by and construed in accordance with the laws of the State of Michigan without giving effect to the principles of conflicts of
laws. 
  

	18.	Expenses and Fees 

  
 Whether or not the transactions contemplated by this Agreement are consummated, each of the Parties hereto shall pay the fees and expenses of its counsel,
accountants and other experts incident to the negotiation and preparation of this Agreement and consummation of the transactions contemplated hereby. Buyers shall be responsible for the cost of all fees for the recording of transfer documents and
any sales, transfer, stamp or other excise taxes resulting from the transfer of the Producing Properties to Buyers. All other costs shall be borne by the Party incurring such costs. 
  

	19.	Integration 

  
 This Agreement, including the Exhibits, and the other agreements to be entered into by the Parties under the provisions of this Agreement executed by
Buyer and Seller sets forth the entire agreement and understanding of the Parties in respect of the transactions contemplated hereby and supersedes all prior agreements, prior arrangements and prior understandings relating to the subject matter
hereof. 
  

	20.	Waiver or Modification 

  
 This Agreement may be amended, modified, superseded or cancelled, and any of the terms, covenants, representations, warranties or conditions hereof may be
waived, only by a written instrument executed by a duly authorized officer of Buyer and Seller, or, in the case of a waiver or consent, by or on behalf of the Party or Parties waiving compliance or giving such consent. The failure of any Party at
any time or times to require performance of any provision of this Agreement shall not affect its right at a later time to enforce such provision. No waiver by any Party of any condition, or of any breach of any covenant, agreement, representation or
warranty contained in this Agreement, in any one or more instances, shall be deemed to be or construed as a further or continuing waiver of any such condition or breach or waiver of any other condition or of any breach of any other covenant,
agreement, representation or warranty. 
  

	21.	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 hereof, such
provision shall be fully severable; this Agreement shall be construed and enforced as if such illegal, invalid or unenforceable provision had never comprised a part hereof; and the remaining provisions of this 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. 
  

 28 

	22.	Multiple Counterparts 

  
 This Agreement may be executed in a number of identical counterparts, each of which for all purposes is to be deemed an original, and all of which
constitute, collectively, one agreement. In addition, this Agreement may be executed in a number of counterparts, any one of which may contain the execution of either Buyer or Seller, and all of such counterparts taken together shall constitute one
completely executed original agreement. 
  

	23.	Public Announcements 

  
 Upon one Party requesting consent to make a public announcement, each Party agrees to exercise its best efforts to agree upon the text of a joint public
announcement or statement to be made by both Buyers and Sellers. Nothing contained in this Section shall be construed to require either Party to obtain approval of the other party hereto to disclose information with respect to the transactions
contemplated by this Agreement to any state or federal governmental authority or agency to the extent required by applicable law or by any applicable rules, regulations or orders of any governmental authority or agency having jurisdiction or
necessary to comply with disclosure requirements of securities exchange or any applicable securities laws. 
  

	24.	Conflict Waiver 

  
 Buyers and Sellers each acknowledge that they have requested the law firm of Warner Norcross & Judd LLP to prepare this Purchase and Sale
Agreement and Assignment of Interests, and to further prepare all Exhibits and Schedules in connection therewith. Warner Norcross & Judd LLP has not negotiated any portion of the terms contained herein, nor has it negotiated the Exhibits or
Schedules attached or to be attached hereto, but has merely attempted to reduce to writing the agreements reached between the Parties. Buyers and Sellers have been advised that a conflict of interest exists between their respective interests. As a
result, Buyers and Sellers have been advised to consider seeking the advice of their own independent counsel. Each of Buyers and Sellers hereby acknowledge that it had ample opportunity to do so, has obtained such independent advice as it deems
necessary, or has elected not to seek such independent advice. Each of Buyers and Sellers further acknowledge and agree that any and all claims against Warner Norcross & Judd LLP regarding any possible conflict of interest with regard to
this Agreement, the Exhibits and Schedules hereunder, the preparation thereof, the Closing pursuant thereto, and the results of or performance under the Closing, are now and are forever irrevocably waived. 
  

	25.	Termination by Sellers 

  
 Sellers may, in their sole discretion, terminate this Agreement and all obligations of both Buyers and Sellers hereunder, if funding for the amounts due
Sellers hereunder is not received by Sellers or their designees by 5:00 p.m. (E.S.T.) Friday, June 17, 2005. 
  

 29 

 EXECUTED and delivered as of the date first written above. 
  

			
	 “SELLERS”

	
	GEOSTAR CORPORATION
		
	By:	 	 /s/ JOHN W. PARROTT

	 	 	John W. Parrott, Vice President
	
	FIRST SOURCE TEXAS, INC.
		
	By:	 	 /s/ JOHN W. PARROTT

	 	 	John W. Parrott, Vice President
	
	FIRST SOURCE BOSSIER, LLC
		
	By:	 	 /s/ JOHN W. PARROTT

	 	 	John W. Parrott,
	 	 	on behalf of its Managing Member
	
	FIRST TEXAS GAS LP
		
	By:	 	 /s/ JOHN W. PARROTT

	 	 	John W. Parrott,
	 	 	on behalf of its General Partner
	
	“BUYERS”
	
	GASTAR EXPLORATION LTD.
		
	By:	 	 /s/ J. RUSSELL PORTER

	 	 	J. Russell Porter, President and
	 	 	Chief Executive Officer
	
	FIRST TEXAS DEVELOPMENT, INC.
		
	By:	 	 /s/ J. RUSSELL PORTER

	 	 	J. Russell Porter, President
	
	BOSSIER BASIN, LLC
		
	By:	 	 /s/ J. RUSSELL PORTER

	 	 	J. Russell Porter,
	 	 	on behalf of its Managing Member
	
	FIRST SOURCE GAS, LP
		
	By:	 	 /s/ J. RUSSELL PORTER

	 	 	J. Russell Porter,
	 	 	on behalf of its General Partner

  

 30Purchase and Sale Agreement - Texas Non Producing Properties

 Exhibit 10.7 
  
 PURCHASE AND SALE AGREEMENT AND 
 ASSIGNMENT OF INTERESTS – TEXAS 
 NON PRODUCING PROPERTIES 
  
 THIS PURCHASE AND SALE AGREEMENT AND ASSIGNMENT OF INTERESTS
(“Agreement”), executed the 16th day of June, 2005 and effective as of the 1st day of January, 2005 (“Effective Date”) by and among GEOSTAR CORPORATION, a Delaware Corporation, together with its
subsidiary and affiliated companies, FIRST SOURCE TEXAS, INC., a Delaware Corporation, FIRST SOURCE BOSSIER, LLC, a Delaware Limited Liability Company, and FIRST TEXAS GAS LP, a Delaware Limited Partnership (sometimes collectively
“Sellers”; sometimes individually “Seller”) and GASTAR EXPLORATION, LTD, an Alberta, Canada Corporation, together with its subsidiary and affiliated companies, FIRST TEXAS DEVELOPMENT, INC., a Michigan Corporation, BOSSIER BASIN,
LLC, a Delaware Limited Liability Company, and FIRST SOURCE GAS, LP, a Delaware Limited Partnership (sometimes collectively “Buyers”; sometimes individually “Buyer”). 
  
 RECITALS 
  
 WHEREAS, GeoStar Corporation (“GeoStar”) and/or one or more of its subsidiaries and affiliates, First Source Texas, Inc. (“FST”),
First Source Bossier, LLC (“FSB”) and First Texas Gas, LP (“FTG”) own certain real estate leasehold interests in the state of Texas; and 
  
 WHEREAS, Gastar Exploration, Ltd. (“Gastar”) and/or one or more of its subsidiaries and affiliates, First Texas Development, Inc.
(“FTD”), Bossier Basin, LLC (“Bossier”) and First Source Gas, LP (“First Gas”) own certain real estate leasehold interests in the state of Texas, which leasehold interests are in the same properties as are owned by
GeoStar, FST, FSB and/or FTG; and 
  
 WHEREAS, GeoStar and its
subsidiaries and affiliates, Sellers herein, desire to sell, transfer, convey and assign to Gastar and its subsidiaries and affiliates, Buyers herein, and Buyers desire to purchase and receive from Sellers, all of Sellers’ collective rights,
title to and interests in, and all of Sellers’ liabilities and responsibilities in connection with, these leasehold interests in the state of Texas. 
  
 NOW THEREFORE, in consideration of the mutual promises of the Parties contained herein, and other good and valuable considerations, the receipt and
sufficiency of which is hereby acknowledged, THE PARTIES HERETO AGREE AS FOLLOWS: 
  

	1.	Definitions and Interpretation 

  
 1.1 For purposes of this Agreement, the following terms shall have the meanings given to them below: 
  
 “Agreement” means this Purchase and Sale Agreement and
Assignment of Interests. 
  
 “Affiliate” means a
company, partnership, limited liability company, limited partnership or other legal entity that, directly or indirectly, controls a Party, is directly or indirectly controlled by a Party, or is directly or indirectly under common control with a
Party. “Control” in this context means the legal or beneficial ownership, directly or indirectly, of fifty percent (50%) or more of such company, partnership or legal entity. 
  
 “Business Day” means a day other than Saturday or Sunday or
any legal holiday for commercial banking institutions under the laws of the State of Michigan. 
  
 “Effective Date” means 7:00 a.m. (CST), January 1, 2005. 
  
 “mcf” means one thousand cubic feet of natural gas. 
  
 “Net Revenue Interest” (“NRI”) means an interest
(expressed as a percentage or decimal fraction) in and to all hydrocarbons produced and saved from or attributable to a property. 
  

 1 

 “Operating Agreement” means the Joint Operating Agreement between Sellers and Buyers
executed on or about March 15, 2005, effective January 1, 2005, and attached to this Agreement as Exhibit 1. 
  
 “Party” means any one of GeoStar Corporation, First Source Texas, Inc., First Source Bossier, LLC, First Texas Gas, LP, Gastar
Exploration, Ltd., First Texas Development, Inc., Bossier Basin, LLC, and First Source Gas, LP, and “Parties” refers to all of them. 
  
 “Permitted Encumbrances” means: 
  
 (a) lessor’s royalties, non-participating royalties, overriding royalties, reversionary interests, and similar burdens upon, measured by, or payable
out of production if the net cumulative effect of such burdens does not operate to reduce the Net Revenue Interest of Sellers in any well (or the specified zone(s) therein) to an amount less than the Net Revenue Interest set forth in the Exhibits
hereto for such well (or the specified zone(s) therein) and does not obligate Sellers to bear a Working Interest for such well (or the specified zone(s) therein) in any amount greater than the Working Interest set forth in the Exhibits hereto for
such well (or the specified zone(s) therein) (unless the Net Revenue Interest for such Property is greater than the Net Revenue Interest set forth on the applicable Exhibit in the same proportion as any increase in such Working Interest);

  
 (b) preferential rights to purchase and required third party
consents to assignments and similar agreements; 
  
 (c) liens for
taxes or assessments not yet due or delinquent or, if delinquent, that are being contested in good faith in the normal course of business; 
  
 (d) customary post-closing consents; 
  
 (e) conventional rights of reassignment; 
  
 (f) all applicable laws and regulations, and rights reserved to or vested in any governmental authority (i) to control or regulate any of the
Properties in any manner; (ii) by the terms of any right, power, franchise, grant, license, or permit, or by any provision of any applicable law or regulation, to terminate such right, power, franchise grant, license, or permit or to purchase,
condemn, expropriate, or recapture or to designate a purchaser of any of the Properties; (iii) to use such Property in a manner which does not materially impair the use of such Property for the purposes for which it is currently owned and
operated; and (iv) to enforce any obligations or duties affecting the Properties to any governmental authority, with respect to any franchise, grant, license, or permit; 
  
 (g) rights of a common owner of any interest in rights-of-way or easements currently held by any Seller and such common
owner as tenants in common or through common ownership; 
  
 (h)
easements, conditions, covenants, restrictions, servitudes, permits, rights-of-way, surface leases and other rights in the Properties for the purpose of surface operations, roads, alleys, highways, railways, pipelines, transmission lines,
transportation lines, distribution lines, power lines, telephone lines, and removal of timber, grazing, logging operations, canals, ditches, reservoirs, and other like purposes, or for the joint or common use of real estate, rights-of-way,
facilities, and equipment which do not materially impair the use of the Properties as currently owned and operated; 
  
 (i) zoning and planning ordinances and municipal regulations; 
  
 (j) vendors, carriers, warehousemen’s, repairmen’s, mechanics, workmen’s, materialmen’s, construction or other like liens arising by
operation of law in the ordinary course of business or incident to the construction or improvement of any property in respect of obligations which are not yet due or which are being contested in good faith by appropriate proceedings by or on behalf
of Sellers; 
  
 (k) liens created under leases and/or operating
agreements or by operation of law in respect of obligations that are not yet due or that are being contested in good faith by appropriate proceedings by or on behalf of Sellers; 
  

 2 

 (l) any encumbrance affecting the Properties which is expressly assumed, bonded or paid by Buyers at or
prior to Closing or which is discharged by Sellers at or prior to Closing; 
  
 (m) any matters referenced in the Exhibits hereto; and 
  
 (n) all other liens, charges, encumbrances, contracts, agreements, obligations, defects, and irregularities affecting the Properties that individually or in the aggregate are not such as to materially interfere with
the operation or use of any of the Properties (as currently owned and operated), do not reduce the Net Revenue Interest of any Seller in any well (or the specified zone(s) therein) to an amount less than the Net Revenue Interest set forth on the
Exhibits hereto for such well (or the specified zone(s) therein) and do not obligate Sellers to bear a Working Interest for such well (or the specified zone(s) therein) in any amount greater than the Working Interest set forth on the exhibits hereto
for such well (unless the Net Revenue Interest for such Properties is greater than the Net Revenue Interest set forth on the Exhibits hereto in the same proportion as any increase in such Working Interest). 
  
 “Promissory Notes” means the unsecured, subordinated
Promissory Notes in the aggregate amount of Twenty Five Million U.S. Dollars (USD$25,000,000), dated as of the Closing Date, issued by Gastar and certain of its subsidiaries and payable to Geostar and certain of its subsidiaries. 
  
 “Properties” means the “Non Producing
Properties,” as defined in Section 2.1, which are more fully described in the Exhibits to be executed hereunder. 
  
 “Texas Producing Properties” means the oil and gas properties and associated rights sold and assigned by Sellers to Buyers pursuant to
the “Purchase and Sale Agreement and Assignment of Interests — Texas Producing Properties” of even date herewith. 
  
 “Texas Properties” means the Properties and the Texas Producing Properties. 
  
 “Working Interest” (“WI”) means the percentage of
costs and expenses attributable to the maintenance, development and operation of a Property. 
  
 1.2 Terms denoting the singular only shall include the plural, and vice versa. 
  
 1.3 Unless otherwise stated, a reference to a Recital, Article, Section, Schedule or Exhibit is a reference to a Recital, Article, Section, Schedule or
Exhibit of this Agreement. 
  
 1.4 Section numbers and headings
are for convenience of reference only, and shall not affect the interpretation of this Agreement. 
  
 1.5 Reference to any gender includes the other. 
  
 1.6 Reference to “including” means “including, but not by way of limitation.” 
  
 1.7 Unless otherwise expressly provided to this Agreement, reference to an
agreement (including this Agreement), document, or instrument is to the same as amended, modified, novated or replaced from time to time. 
  
 1.8 Reference to a statute or other legislative act, by-law, rule, regulation, or order is to the same as amended, modified or replaced from time to time
and to any rule, regulation or order promulgated pursuant to such law. 
  

	2.	Sale and Purchase of Properties and Assignment of Interests 

  

	 	2.1	Effect and Intent 

  
 With the execution and delivery of this Agreement, and with the execution and delivery of the Assignments, Bills of Sale and other documents of
conveyance and assumption referenced herein to be executed and delivered at Closing, Sellers shall have sold, transferred, assigned and 
  

 3 

 conveyed to Buyers, and Buyers shall have purchased and received from Sellers, all (one hundred percent
(100%)) of Sellers’ rights, title to and interest in Non Producing Properties (as hereinafter defined) in Texas, all of Sellers’ rights, title to, interests in, and obligations under all contracts and agreements pertaining to said Non
Producing Properties, all of Sellers’ mineral rights and obligations in connection with said Non Producing Properties, and all of Sellers’ lease and leasehold rights and obligations in connection with said Non Producing Properties.
“Non Producing Properties” means and includes all of Sellers’ interests in Properties in Texas other than the Texas Producing Properties, and includes those Properties in Texas on which exploration for and production of oil, natural
gas, coalbed methane gas or other hydrocarbons has not yet occurred. Non Producing Properties also means and includes, with respect to these Properties, all rights, title to and interests in agreements or contracts granting the right or option to
explore for and produce oil, natural gas, coalbed methane gas or other hydrocarbons, as applicable, including leasehold interests, fee mineral interests and operating rights), all production of oil, natural gas, coalbed methane gas or other
hydrocarbons, all proceeds and revenues from this production and sale of oil, natural gas, coalbed methane gas or other hydrocarbons, wells on the Properties (whether shut in or temporarily abandoned), severed substances, surface rights, equipment
(including fixtures and physical facilities located on the Properties) data (to the extent assignable), contracts and permits. “Non Producing Properties” further includes all of Sellers’ rights, title to, interests in and obligations
under agreements or contracts granting the right or option to explore for and produce oil, natural gas, coalbed methane gas or other hydrocarbons, as applicable, on those Non Producing Properties, including leasehold interests, fee mineral
interests, operating rights, surface rights, equipment (including fixtures and physical facilities) located on the Properties, data, contracts and permits. 
  

	 	2.2	Assignments and Assumptions 

  
 At Closing, Sellers shall sell, transfer, convey and assign to Buyers, and Buyers shall purchase, receive and assume from Sellers, all of Sellers’
rights, title to, interests in and liabilities and obligations in connection with the Non Producing Properties, effective as of the Effective Date. 
  

	 	2.3	Excluded Assets 

  
 As used herein, “Excluded Assets” means all other of Sellers’ assets and rights other than in the Non Producing Properties, including all
trade credits, all accounts receivable and all other proceeds, income or revenues attributable to the Properties with respect to any period of time prior to the Effective Date. 
  

	 	2.4	Assignment of Properties, Leases and Leasehold Interests  

  
 At Closing, Sellers shall execute an Assignment or Assignments in the forms attached collectively hereto as Exhibit 2, assigning to Buyers all (one
hundred percent (100%)) of Sellers’ collective rights, title to and interest in the Non Producing Properties, including leases, leasehold interests, leasehold rights, exploration rights, mineral rights, all production rights for oil,
natural gas, coalbed methane gas or other hydrocarbons, and all proceeds from the sale of oil, natural gas, coalbed methane gas and other hydrocarbons. The Non Producing Properties are specifically described and listed in attachments to Exhibit 2,
which attachments consist of legal descriptions of all (one hundred percent (100%)) of these Non Producing Properties in the state of Texas in which Sellers have an interest, including Properties in Leon and Robertson Counties in the State of
Texas, a portion of which are sometimes referred to as the “Presco” acreage or property, “Hilltop” acreage or property, and “Navasota” acreage or property. The Parties recognize that a few properties, leases and
leasehold interests were acquired, or are in the process of being acquired, at or about the date of the execution of this Agreement which may not appear in Exhibit 2 (“Supplemental Properties”). Sellers shall execute an Assignment
assigning to Buyers all of Sellers collective rights, title to and interests in those Supplemental Properties on or before December 31, 2005. Those Supplemental Properties, and the assignment thereof, from Sellers to Buyers, shall be governed
by this Agreement. 
  

 4 

	 	2.5	Intentionally Omitted (Exhibit 3 Intentionally Omitted) 

  

	 	2.6	Assignment of Contracts and Agreements  

  
 At Closing, Sellers and Buyers shall execute an “Assignment of Contracts and Agreements” in the form attached hereto as Exhibit 4, assigning to
Buyers all (one hundred percent (100%)) of Sellers’ collective rights, title to, interests in and obligations under all contracts and agreements pertaining to the Properties, including any joint operating agreements, joint venture
agreements, rig agreements, drilling agreements, and agreements pertaining to the collection, gathering, transmission and sale of oil, natural gas or other hydrocarbons and providing for the assumption thereof by Buyers. Exhibit 4 shall contain a
schedule or schedules describing such contracts and agreements related to the Properties. 
  

	3.	Purchase Price 

  
 In exchange for the assets and interests purchased, transferred, conveyed and assigned by Sellers to Buyers, Buyers shall pay Sellers as follows:

  

	 	3.1	Base Purchase Price 

  
 Buyers shall provide the following to Sellers as the “Base Purchase Price,” subject to the adjustments provided in Section 3.2 et
seq herein (the “Adjusted Base Purchase Price.”) 
  

	 	3.1.1	Cash at Closing. At Closing, Buyers shall pay Sellers the sum of Twenty Four Million Six Hundred Twenty Thousand Six Hundred Dollars ($24,620,600) in United States
Dollars (“USD”) by certified check and/or by wire transfer to the account or accounts designated by Sellers. 

  

	 	3.1.2	Promissory Note. At Closing, Buyers shall deliver to Sellers in unsecured, subordinated Promissory Note in the principal amount of Seven Million Dollars USD
($7,000,000) in the form attached hereto as Exhibit 5. Said Promissory Note shall bear interest per annum at the Applicable Federal Rate (“AFR”) in effect on the date of execution. The Promissory Note shall have a maturity date of
January 31, 2006 for payment of the balance in full. Payment of said Promissory Note shall be subordinate in payment and priority to any other lender, note holder or creditor of Buyers. 

  

	 	3.1.3	Gastar Stock. Buyers shall provide Sellers at Closing a number of shares of common stock in Gastar which, when multiplied by Four Dollars and Fifty Cents per share in
Canadian funds ($4.50/sh) (CDN) equals Six Million Dollars ($6,000,000) (USD). 

  

	 	3.2	Adjustments to Purchase Price 

  
 The Base Purchase Price shall be adjusted as provided in this Section 3.2. 
  

	 	3.2.1	The Base Purchase Price shall be increased by the following amounts (without duplication): 

  

	 	(a)	The amount of all capital and operating expenditures paid by Sellers in connection with Sellers’ percentage share of the capital costs and operating costs of the Properties for
the period between the Effective Date and the Closing Date. 

  

	 	(b)	The amount of prepaid expenditures paid by Sellers in connection with Sellers’ percentage share of such prepaid expenses attributable to the Properties for the period between
the Effective Date and the Closing Date. 

  

 5 

	 	(c)	The amount of Two Hundred Seventy Five Dollars ($275.00) USD per day between the Effective Date and the Closing Date attributable to Sellers’ contribution to general and
administrative overhead expenses for the Properties. 

  

	 	3.2.2	The Base Purchase Price shall be decreased by the following amounts (without duplication): 

  

	 	(a)	The amount of all taxes prorated to Buyers in accordance with Section 10. 

  

	 	(b)	One Hundred (100%) percent of the net proceeds received by Sellers from the production and sale of Sellers’ interest in the coalbed methane gas, natural gas and other
hydrocarbons from the Properties; if any, between the Effective Date and the Closing Date. 

  

	 	3.2.3	In accordance with the provisions of Section 11.1, Buyers shall deliver to Sellers a statement (the “Settlement Statement”) within sixty (60) days of the Closing
Date, setting forth the adjustments to the Base Purchase Price as provided in Section 3.2. The Settlement Statement will be prepared in accordance with customary accounting principles used in the oil gas industry and familiar to both Sellers
and Buyers. 

  

	 	3.2.4	Upon a determination of the Final Settlement Statement pursuant to Section 11, either by mutual agreement or by arbitration, the adjustment to the Base Purchase Price will be
known. If such adjustment to the Base Purchase Price reflects that an amount is due to Sellers, Buyers shall (a) pay fifty percent (50%) of that amount to Sellers in cash in twelve (12) equal monthly payments, commencing three
(3) months from the date of this Agreement, and (b) pay the other fifty percent (50%) of that amount to Sellers within sixty (60) days of the date of this Agreement in shares of Gastar common stock, the number of which shall be
determined by dividing the amount due, converted to Canadian dollars at the then applicable exchange rate, by a price of Four Dollars and Fifty Cents per share in Canadian funds ($4.50/sh) (CDN). For example, if the total adjustment amount is Nine
Million Dollars in Canadian funds ($9,000,000) (CDN), the number of shares of Gastar stock owing would be One Million (1,000,000); ($4,500,000/$4.50 = 1,000,000). If such adjustment to the Base Purchase Price reflects that an amount is due to
Buyers, Sellers shall either (a) reduce the aggregated principal amount due under the Promissory Notes by that amount, or (b) pay such amount to Buyers in shares of Gastar common stock valued at Four Dollars and Fifty Cents per share in
Canadian funds ($4.50) CDN. 

  

	 	3.3	Look-Back Purchase Price 

  
 In addition to the Base Purchase Price set forth in Sections 3.1.1 to 3.1.3, as adjusted under Sections 3.2.1 to 3.2.4, Buyers shall be responsible to
Sellers for payment of an additional amount, the “Look-Back Purchase Price,” which amount is determined in accordance with the provisions of Section 3.4 et seq herein. While Sections 3.4, 3.4.1, 3.4.2, 3.4.3, 3.4.4, 4.2, 4.2.1,
4.2.2, 4.2.3 and 4.2.4 appear in both this Agreement and in the “Purchase and Sale Agreement and Assignment of Interests – Texas Producing Properties” to be executed simultaneously herewith, Sections 3.4. 3.4.1, 3.4.2, 3.4.3, 3.4.4,
4.2, 4.2.1, 4.2.2, 4.2.3 and 4.2.4 are to be applied only once, in total, for both this Agreement and for that Agreement. 
  

 6 

	 	3.4	Determination of Look-Back Purchase Price  

  
 The Look-Back Purchase Price shall be determined and paid as follows: 
  

	 	3.4.1	Determination of 2006 2P Reserves and 2007 2P Reserves. 

  

	 	(a)	2006 2P Reserves. As soon as reasonably practicable following receipt from Netherland Sewell and Associates, Inc. (“NSAI”) of a reserve report reflecting the
proved and probable reserves as of June 30, 2006, for both the Properties and the Texas Producing Properties (in either case, whether or not owned by Buyers as of June 30, 2006), but not later than sixty (60) days following receipt of
that report, the Parties shall meet to calculate and agree upon the proven and probable reserves attributable the Texas Properties as of June 30, 2006 (the “2006 2P Reserves”). Notwithstanding the foregoing, Sellers, in their sole
discretion and at their sole cost, may retain an independent, professionally certified reservoir engineering firm to independently make a 2P Reserves determination of the Texas Properties as of June 30, 2006. Such report, if prepared, shall
utilize the same regulatory requirements as does the NSAI final reserve report as of June 30, 2006, being either the Canadian guidelines NI 51-101 regarding reserve estimate and/or the Securities and Exchange Commission and Society of Petroleum
Engineers reserve calculation guidelines. If such report determines that the 2006 2P Reserves for the Texas Properties are greater than the 2006 2P Reserves for those Properties as determined by NSAI, the 2006 2P Reserves shall be the average of the
2006 2P Reserves determined by NSAI and the 2006 2P Reserves determined by Sellers’ independent reservoir engineering firm. To the extent Buyers sell or farm out any of the Texas Properties prior to June 30, 2006, the proved and probable
reserves attributable to such sold or farmed out properties shall be included in the calculation of 2006 2P Reserves (under the assumption that Sellers’ interest was proportionately reduced through a farm out, if applicable), and each of NSAI
and any independent reservoir engineering firm selected by Sellers shall be permitted to use reasonable assumptions in calculating the amount of such reserves attributable to such sold or farmed out properties as of June 30, 2006. If Buyers
sell, assign, transfer or convey all or substantially all of the Texas Properties before June 30, 2006, or Buyers are merged into or bought by another entity before June 30, 2006, the date of definitive agreement for such sale, transfer or
merger shall be the date on which the Reserve Report shall be determined for purposes of Section 3.4.1(a) and the calculation of 2006 2P Reserves and, notwithstanding anything to the contrary in this Agreement, there shall be no subsequent
calculation of 2007 2P Reserves or payment of a 2007 Look-Back Payment. 

  

	 	(b)	2007 2P Reserves. As soon as reasonably practicable following receipt from NSAI of a reserve report reflecting the proved and probable reserves as of June 30,
2007, for both the Properties and the Texas Producing Properties (in either case, whether or not owned by Buyers as of June 30, 2007), but not later than sixty (60) days following receipt of that report, the Parties shall meet to calculate
and agree upon the proven and probable reserves attributable to the Texas Properties as of June 30, 2007 (the “2007 2P Reserves”). Notwithstanding the foregoing, Sellers, in their sole discretion and at their sole cost, may retain an
independent, professionally certified reservoir engineering firm to independently make a 2P Reserves determination of the Texas Properties as of June 30, 2007. Such report, if prepared, shall utilize the same regulatory requirements as does the
NSAI final reserve report as of June 30, 2007, being either the Canadian guidelines NI 51-101 regarding reserve estimate and/or the Securities and Exchange Commission and Society of Petroleum Engineers reserve calculation guidelines. If such
report determines that the 2007 2P Reserves for the Texas Properties are greater than the 2007 2P Reserves for those Properties as determined by NSAI, the 2007 2P Reserves shall be the average of the 2007 2P Reserves determined by NSAI and the 2007
2P Reserves determined by Sellers’ independent reservoir engineering firm. To the extent Buyers sell or farm out any of the Texas Properties prior to 

  

 7 

	 	 	June 30, 2007, the proved and probable reserves attributable to such sold or farmed out properties shall be included in the calculation of 2007 2P Reserves (under the
assumption that Sellers’ interest was proportionately reduced through a farm out, if applicable), and each of NSAI and any independent reservoir engineering firm selected by Sellers shall be permitted to use reasonable assumptions in
calculating the amount of such reserves attributable to such sold or farmed out properties as of June 30, 2007. If Buyers sell, assign, transfer or convey all or substantially all of the Texas Properties between June 30, 2006 and
June 30, 2007, or Buyers are merged into or bought by another entity between June 30, 2006 and June 30, 2007, the date of definitive agreement for such sale, transfer or merger shall be the date on which the Reserve Report shall be
determined for purposes of Section 3.41(b) and the calculation of 2007 2P Reserves. The 2007 2P Reserves shall be subject to adjustment in accordance with Section 4.2.2 of the Agreement. 

  

	 	3.4.2	Calculation of Excess Reserves Value.  

  

	 	(a)	2006 Excess Reserves Value. To the extent the 2006 2P Reserves, determined in accordance with the foregoing, are greater than the 2P Reserves attributable to the Texas
Properties transferred and assigned as of December 31, 2004, as determined by the NSAI Report as of December 31, 2004, the volumetric difference between the two values expressed in mcf, multiplied by $1.50/mcf (USD), shall be referred to
as the “2006 Excess Reserves Value.” 

  

	 	(b)	2007 Excess Reserves Value. To the extent the 2007 2P Reserves, determined in accordance with the foregoing, are greater than the 2006 2P Reserves attributable to the
Texas Properties transferred and assigned as of June 30, 2006, as determined by the NSAI Report as of June 30, 2006, the volumetric difference between the two values expressed in mcf, multiplied by $1.50/mcf (USD), shall be referred to as
the “2007 Excess Reserves Value.” 

  

	 	3.4.3	Calculation of Sellers’ Look-Back Costs and Look-Back Payment. The Parties shall determine the “Sellers’ 2006 Look-Back Costs” and the
“Sellers’ 2007 Look-Back Costs;” and the “2006 Look-Back Payment” and “2007 Look-Back Payment” (collectively referred to as the “Look-Back Payments”) as follows: 

  

	 	(a)	2006 Look-Back Payment. At the meeting described in Section 3.4.1(a), the Buyers and Sellers shall determine the amount of Sellers’ net share of capital
costs attributable to the drilling and completion (not including operation and maintenance costs, but inclusive of costs associated with the gathering, processing and sales of production attributable to such wells) for all wells drilled on the Texas
Properties between the Effective Date and June 30, 2006 as if Sellers had not sold, conveyed, transferred or assigned the Texas Properties to Buyers. This determination shall be based upon Sellers’ share of actual costs, as applicable, for
wells drilled and completed, and shall consist of the sum of following two components: a) Sellers share of Authorizations for Expenditures (“AFEs”) for all wells actually drilled, drilling and/or completed between the Effective Date and
June 30, 2006, including an accrual for capital costs on any wells drilling or being completed at June 30, 2006; b) to the extent Buyers sold or farmed out any of the Texas Properties prior to June 30, 2006 which resulted in a
determination of proved and probable reserves for those sold or farmed out properties which was included in the calculation of 2006 2P Reserves under Section 3.4.1(a), a reasonable estimate of what Sellers’ net share of capital costs would
have been to develop those proved and probable reserves on the sold or farmed out properties. The resultant amount, “Sellers’ 2006 Look-Back Costs,” shall be subtracted from the “2006 Excess Reserves Value” determined under
Section 3.4.2(a) to arrive at the amount of the “2006 Look-Back Payment.” 

  

 8 

	 	(b)	2007 Look-Back Payment. At the meeting described in Section 3.4.1(b), the Buyers and Sellers shall determine the amount of Sellers’ net share of capital
costs attributable to the drilling and completion (not including operation and maintenance costs, but inclusive of costs associated with the gathering, processing and sales of production attributable to such wells) for all wells drilled on the Texas
Properties between June 30, 2006 and June 30, 2007 as if Sellers had not sold, conveyed, transferred or assigned the Texas Properties to Buyers. This determination shall be based upon Sellers’ share of actual costs, as applicable, for
wells drilled and completed, and shall consist of the sum of following three components: a) Sellers share of AFEs for all wells actually drilled, drilling and/or completed between June 30, 2006 and June 30, 2007, including an accrual for
capital costs on any wells drilling or being completed at June 30, 2007; b) if applicable, Sellers’ share of prepared AFEs and/or projected AFEs for the drilling and completion of the “look-back gross-up wells,” as defined in
Section 4.2.2; c) to the extent Buyers sold or farmed out any of the Texas Properties prior to June 30, 2007 which resulted in a determination of proved and probable reserves for those sold or farmed out properties which was included in
the calculation of 2007 2P Reserves under Section 3.4.1(b), a reasonable estimate of what Sellers’ net share of capital costs would have been to develop those proved and probable reserves on the sold or farmed out properties. The resultant
amount, “Sellers’ 2007 Look-Back Costs,” shall be subtracted from the “2007 Excess Reserves Value” determined under Section 3.4.2(b) to arrive at the amount of the “2007 Look-Back Payment.”

  

	 	3.4.4	Delivery and Form of Look-Back Payments. The 2006 Look-Back Payment shall be delivered to Buyers within ten (10) days of final calculation made pursuant to
Section 3.4.3(a). The 2007 Look-Back Payment shall be delivered to Buyers within ten (10) days of final calculation made pursuant to Section 3.4.3(b). To satisfy the Look-Back Payments, Buyers shall provide Sellers with a number of
shares of Gastar common stock determined as follows: The volume weighted five (5) day average trading price of Gastar stock on the TSE (or such other national exchange if, at that time, the shares of Gastar are no longer traded on the TSE), for
the last five (5) trading days preceding the date that the particular Look-Back Payment is to be made shall be determined. That weighted average per share stock price shall then be reduced by ten percent (10%), the discounted per share stock
price. The particular Look-Back Payment shall be divided by the discounted per share stock price to determine the gross number of Look-Back Payment shares. This resultant number constitutes the number of Gastar shares to be transferred from Buyers
to Sellers to satisfy the particular Look-Back Payment. For example, if the particular Look-Back Payment amount is Sixty Million Dollars ($60,000,000) USD, and the weighted average per share price of Gastar stock is Three Dollars and Thirty Three
cents ($3.33) USD, the number of additional shares needed to satisfy the Look-Back Payment amount is Twenty Million (20,000,000) shares; ($60,000,000)/($3.33 - $0.33) = 20,000,000. 

  
 If the calculation performed under this Section 3.4.5
results in a negative number, Sellers shall provide to Buyers that negative number of Gastar shares, expressed as a positive number. For example, if the calculation resulted in a negative One Million (1,000,000) shares, Sellers would provide
One Million (1,000,000) Gastar shares to Buyers. In this circumstance, Buyers may, in their sole discretion, cancel the equivalent number of shares and share certificates held by Sellers in lieu of receipt from Sellers of the shares owing.

  

 9 

	4.	Affirmative Covenants of Gastar 

  
 In addition to all other rights, duties and obligations undertaken by it under this Agreement, the LOI and all documents and agreements to be executed in
connection with this Agreement, Gastar affirmatively covenants and agrees as follows: 
  

	 	4.1	Gastar Covenant Concerning Registration Rights Agreement 

  
 At Closing, Gastar and GeoStar shall execute a Registration Rights Agreement in the form attached hereto as Exhibit 6. 
  

	 	4.2	Gastar Covenants Concerning Drilling Obligations 

  

	 	4.2.1	Drilling in Texas. On or before June 30, 2007, Gastar, through itself or its subsidiary and affiliated companies, shall be obligated to drill and spud, and use
good faith efforts to complete, no less than twenty (20) wells on the Texas Properties no less than eighteen (18) of which are to test the Deep Bossier formation and no less than two (2) of which are to test the Travis Peak formation.
For purposes of satisfying this twenty (20) well requirement, the wells currently identified as the Greer #1 well (“Greer #1”) and the Fridkin-Kaufman #2 well (“F-K #2”) shall count as two (2) of those wells. Buyers
agree to continue to provide any and all drilling, completion and production information to Sellers, or Sellers’ assigns, related to the Texas Properties during the period of time up to and until the final Look-Back payment is made in full to
Sellers. Sellers agree and understand that all information provided by Buyers may continue to be provided through certain on line data sources (such as Pason, Viseon, e-Lynx), or other sources that Buyers deem prudent and necessary, as well as
quarterly reports and updates from the Buyers to Sellers over this period of time. Any such information provided shall be, and shall remain, confidential in nature and Buyers specifically acknowledge that access to such information will be deemed to
be receipt of material non-public information. 

  

	 	4.2.2	Deep Bossier Wells If, by June 30, 2007, Gastar has not drilled at least eighteen (18) wells to test the Deep Bossier formation on the Texas Properties
inclusive of the Greer #1 and F-K #2 wells, the 2007 2P Reserves determined under Section 3.4.1 shall be adjusted, and therefore increased, by adding to the 2007 2P Reserves for the proved and probable wells and locations within the NSAI
reserve report effective June 30, 2007 in East Texas, inclusive of Greer #1 and F-K #2, the “look-back gross-up reserves,” calculated as follows: The 2007 2P Reserves for those proved and probable wells and locations within the NSAI
reserve report effective June 30, 2007 (specifically those wells for which 2P Reserves have been at that time derived by NSAI and, if applicable, the qualified independent reservoir engineering firm selected by Sellers), inclusive of Greer #1
and F-K #2, shall be totaled. That total of those 2P Reserves shall be divided by the total number of wells booked in the proved and probable reserve categories by NSAI for which these particular 2P Reserves have been determined. This number shall
be multiplied by the number of “look-back gross-up wells,” defined as the difference between eighteen (18) wells and the number of wells actually drilled and from which the 2P Reserves were derived, inclusive of Greer #1 and F-K #2.
The product of that multiplication, the “look-back gross-up reserves,” shall be added to the 2P Reserves for the proved and probable wells and locations within the NSAI reserve report effective June 30, 2007, inclusive of Greer #1 and
F-K #2. The resultant sum shall be used as the “2007 2P Reserves” for purposes of the calculations required under Section 3.4, specifically Sections 3.4.1 to Section 3.4.5. Thus, for example, if a total of fourteen
(14) wells are actually completed by June 30, 2007 hereunder, inclusive of Greer #1 and F-K #2, the average reserves per well (total of 2P reserves determined for the total number of wells booked in the proved and probable reserve
categories by NSAI for which these particular 2P Reserves have been determined divided by the same total number of wells booked in the proved and probable reserve categories by NSAI for which these particular 2P Reserves have been determined) shall
be multiplied by four (4) (18 wells required minus 14 wells drilled equals 4 “look-back gross-up wells”) and that amount of 

  

 10 

	 	 	“look-back gross-up reserves” shall be added to the 2P Reserves for the proved and probable wells and locations within the NSAI reserve report effective June 30, 2007
for purposes of determining the total 2007 2P Reserves and the 2007 Look-Back Payment for the Texas Properties. 

  

	 	4.2.3	Travis Peak Wells. Among the twenty (20) wells to be drilled by Gastar pursuant to its affirmative covenant contained in Section 4.2 shall be at least two
(2) wells drilled to depths sufficient to test the Travis Peak formation, and attempted to be completed, if deemed commercially reasonable, in the Travis Peak formation in the Hilltop area of East Texas, on Properties to be sold, conveyed,
transferred and assigned hereunder. Said two (2) “Travis Peak” wells shall be drilled and completed on or before June 30, 2007. It is expressly understood and agreed that Gastar may attempt a Travis Peak completion in a well
drilled to test the Bossier formation in order to satisfy the requirements of Section 4.2.3. 

  

	 	4.2.4	Failure to Drill and Test Travis Peak Wells. If Gastar does not drill and test two (2) wells in the Travis Peak formation by June 30, 2007, then Sellers
shall have the right, but not the obligation, to farm in the Travis Peak rights across the AMI defined within the March 15, 2005 JOA for the Hilltop area leasehold under the terms approved at the June 28, 2004 Gastar Board of Directors
meeting, attached hereto as Exhibit 7. In the event that Sellers so elect, they will drill, complete and operate the Travis Peak wells (which may be more than two wells) and carry Gastar for a twenty five (25%) Working Interest (“WI”)
in the first two Travis Peak wells so drilled, completed and operated by Sellers. Gastar will earn a twenty five percent (25%) After Pay Out Back-in Interest (“APO BI”) in the next two Travis Peak wells (i.e., the third and fourth
wells) in the event that they are drilled, completed and operated by Sellers. Beginning with the fifth well in the Travis Peak area, and with respect to each well thereafter, Sellers will have a sixty five percent (65%) WI and shall act as the
Operator under the terms with respect to a Joint Operating Agreement to be executed pertaining to the Travis Peak wells. Gastar will have a thirty five percent (35%) WI in the fifth and subsequent wells, with a right to elect, on a well-by-well
basis, to convert its thirty five percent (35%) WI to twenty five percent (25%) APO BI. In the event Sellers elect to drill, complete and operate the Travis Peak wells, they will have reasonable access to the Travis Peak records of Buyers
in accordance with Section 14.2. Buyers shall use their good faith efforts in cooperating with Sellers in providing such records and data as is reasonably required by Sellers in this regard. Sellers shall be allowed two years to complete their
farm in obligation if Buyers fail to drill and complete the two Travis Peak wells contemplated herein. 

  

	5.	Representations and Warranties of Sellers. 

  
 Each of GeoStar, First Source Texas, Inc., First Source Bossier, LLC, and First Texas Gas, LP, Sellers herein, collectively, individually, jointly and
severally represent and warrant to Buyers as follows. 
  

	 	5.1	Organization 

  
 Such Seller is duly organized validly existing and in good standing under the laws of the state in which it was organized. Such Seller is qualified to do
business in and is in good standing under the laws of each state in which it must be as it pertains to its ownership of the Properties to be sold, transferred, conveyed and assigned hereunder, other than any failure to be so qualified or in good
standing that would not have a material adverse effect (“MAE”) on the Properties to be transferred, considered collectively as a whole. 
  

	 	5.2	Authority and Authorization 

  
 Such Seller has full power and authority to carry on its business as presently conducted, to enter into this Agreement, and to perform its obligations
under this Agreement. The execution and 
  

 11 

 delivery of this Agreement by such Seller has been, and the performance by such Seller of this Agreement
and the transactions contemplated hereby, shall be at the time required to be performed hereunder, duly and validly authorized by all requisite action on the part of such Seller. 
  

	 	5.3	Enforceability 

  
 This Agreement has been duly executed and delivered on behalf of such Seller and constitutes the legal, valid and binding obligation of such Seller,
enforceable in accordance with its terms, except as enforceability may be limited by applicable bankruptcy, reorganization or moratorium statutes, or other similar laws affecting the rights of creditors generally or equitable principles
(collectively, “Equitable Limitations”). All documents and instruments required hereunder to be executed and delivered by such Seller as appropriate has been duly executed and delivered and constitute legal, valid and binding obligations
of such Seller enforceable in accordance with their terms, except as enforceability may be limited by Equitable Limitations. 
  

	 	5.4	Conflicts 

  
 The execution and delivery of this Agreement by such Seller does not, and the consummation of the transactions contemplated by this Agreement shall not,
(a) violate or be in conflict with, or require the consent of any person or entity under, any provision of such Seller’s governing documents as it pertains to such Seller, (b) violate any provision under any judgment, decree, judicial
or administrative order, award, writ, injunction, statute, rule or regulation applicable to such Seller other than any violation that would not have a MAE, (c) result in the creation of any lien, charge or encumbrance on any of the Properties
to be transferred and assigned hereunder that would have a MAE. 
  

	 	5.5	Contracts 

  
 Exhibit 8 sets forth a list of the following contracts, agreements and commitments to which any of the Properties are or may be bound: (a) any
agreement with any affiliate of such Seller, (b) any agreement or contract of such Seller for the sale, exchange or other disposition of any hydrocarbons, including coalbed methane gas or natural gas, as applicable, produced by such Seller from
the Properties that is not cancelable without penalty on not more than thirty (30) days prior written notice, (c) any agreement of such Seller to sell, lease, farm in, farm out or otherwise dispose of its interests in any of the
Properties, other than conventional rights of reassignment and preferential rights; (d) any operating agreement to which such Seller’s interest in any of the Properties is subject, and (e) any contract that commits such Seller to
expend more than Fifty Thousand Dollars ($50,000) USD in any year in connection with the Properties (“Contracts”). 
  

	 	5.6	Litigation and Claims  

  
 Except as is set forth on Exhibit 9, (a) no claim, demand, filing, investigation, administrative proceeding, action, suit or other legal proceeding
is pending or, to such Seller’s knowledge, is threatened against such Seller with respect to the Properties or the ownership or operation of any thereof, other than proceedings relating to the oil and gas industry generally and as to which such
Seller is not a named party, and (b) no written notice from any governmental authority or any other person (including employees) has been received by such Seller with respect to the Properties claiming of any material violation by such Seller
of any law, rule, regulation, ordinance, order, decision or decree of any governmental authority (including, without limitation, any such law, rule, regulation, ordinance, order, decision or decree concerning the conservation of natural resources).

  

 12 

	 	5.7	Approvals and Preferential Rights 

  
 Exhibit 10 contains a complete and accurate list of (a) all approvals and consents required to be obtained by such Seller for the assignment or
transfer of the Properties to Buyers, other than approvals and consents of governmental authorities, that (i) have already been obtained by such Sellers, or (ii) are customarily obtained in similar transactions after the consummation of
the transaction (which Seller represents will be obtained promptly following Closing), and (b) all preferential purchase rights that affect the transactions contemplated by this Agreement. To the extent that an otherwise required approval and
consent is not listed on Exhibit 10, it is because the period of time has lapsed for that individual or entity to have responded, following timely notice provided to them or it, with no response or exercise of preferential right. 
  

	 	5.8	Compliance with Laws and Permits 

  
 During the period of such Seller’s ownership of the Properties, to such Seller’s knowledge, except as set forth elsewhere in this Agreement or
in the Exhibits to this Agreement, those Properties have been and currently are operated, and such Seller and those Properties are, in compliance with the provisions and requirements of all laws, rules, regulations, ordinances, orders, decisions and
decrees of all governmental authorities having jurisdiction with respect to those Properties or the ownership or operation of any thereof, except where noncompliance would not have, individually or in the aggregate, a MAE. All necessary governmental
permits, licenses and other authorizations with regard to the ownership or operation of those Properties have been obtained and maintained in effect, except where the failure to obtain or maintain such permits, licenses and other authorizations
would not have, individually or in the aggregate, a MAE. No violations exist in respect of such permits, licenses or other authorizations, except for violations that would not have, individually or in the aggregate, a MAE. 
  

	 	5.9	Environmental Compliance  

  
 During the period of such Seller’s ownership of the Properties, to such Seller’s knowledge, except as set forth on Exhibit 11, no pollutant,
waste, contaminant, or hazardous, extremely hazardous, or toxic material, substance, chemical or waste identified, defined or regulated as such under any law relating to health and safety or environmental matters is present, or has been handled,
managed, stored, transported, processed, treated, disposed of, released, migrated or has escaped on, in, from, under or in connection with those Properties or the ownership or operation thereof such as to cause a condition or circumstance that
results in a violation of any law relating to health and safety or environmental matters or in a remediation, removal, response, restoration, abatement, investigative or monitoring obligation, other than violations or obligations that (a) were
not the result of any action or omission by such Seller or (b) would not have, individually or in the aggregate, a MAE. Seller shall also identify separately in Exhibit 11 those circumstances known to such Seller which would have been listed
but for subsections (a) and (b) of this Section. 
  

	 	5.10	Status of Contracts 

  
 All of the Contracts to be transferred and assigned hereunder to which such Seller is bound, are in full force and effect, and such Seller is not in
breach of, or with the lapse of time or the giving of notice, or both, would be in breach of any of its material obligations thereunder, and consummation of the transactions contemplated hereunder will not result in such a breach. 
  

	 	5.11	Production Burdens, Taxes, Expenses and Revenues 

  
 All payments due under or with respect to the Properties have been properly and timely paid when due, or funds have been set aside for such purpose. All
ad valorem, property, production, severance and other taxes based on or measured by such Seller’s ownership of those Properties or the production of hydrocarbons, including coalbed methane gas or natural gas, as applicable, 
  

 13 

 therefrom have been properly and timely paid when due. All expenses payable under the terms of the
Contracts attributable to such Seller have been properly and timely paid when due, except for such expenses as are being currently paid prior to delinquency in the ordinary course of business. All of the proceeds from the sale of any hydrocarbons,
including coalbed methane gas or natural gas, as applicable, are being properly and timely paid when due to such Seller, as appropriate, by the purchasers of production without suspension or indemnity other than standard division order indemnities.
To the best of such Seller’s knowledge, there were no gas imbalances relating to the Properties to be transferred and assigned as of the Effective Date. 
  

	 	5.12	Current Commitments 

  
 Exhibit 12 contains a true and complete list, as of the Closing Date, of all AFEs approved by such Seller to drill or rework wells or for material
capital expenditures pursuant to any of the Contracts for which all of the activities anticipated in such authorities for material expenditures or material commitments have not been completed by the Closing Date and having a remaining expenditure
obligation in excess of Fifty Thousand Dollars ($50,000.00) USD each. 
  

	 	5.13	Liens and Encumbrances 

  
 During such Seller’s ownership of the Properties, and to the best of such Seller’s knowledge for those periods when Sellers did not own the
Properties, except for Permitted Encumbrances or as shown on Exhibit 13, there are no material liens or encumbrances (except for those of record) burdening those Properties. 
  

	 	5.14	Good and Defensible Title 

  
 If the Closing occurs, then effective as of the Closing Date, such Seller warrants good and defensible title to the Producing Properties sold, conveyed,
transferred and assigned by such Seller unto Buyers hereunder against any person lawfully claiming the same by, through or under such Seller, but not otherwise, subject, however to the Permitted Encumbrances, to any matters of record and as shown on
Exhibit 13. 
  

	 	5.15	Trade Payables 

  
 All trade payables incurred by or on behalf of such Seller with respect to the Properties have been paid in full, or will have been paid in full by or on
behalf of such Seller by the Closing Date. There are no claims, actions or lawsuits outstanding, pending or, to the Knowledge of Sellers, threatened by any trade creditor with respect to the Properties, including, without limitation, of those
creditors related to the sale or lease of Properties, the exploration, production, transmission or sale of coalbed methane gas, natural gas or other hydrocarbon products, the sale or lease of assets, or the provision of services. 
  

	 	5.16	Sellers’ Knowledge 

  
 As used herein, “Sellers’ knowledge” or the “Knowledge of Sellers” means the actual knowledge of Thom Robinson, John Parrott,
Tony Ferguson, Frederick Lambert, Milton Evans, Lundin Schneider or Brian Wert. 
  

	6.	Representations and Warranties of Each Buyer 

  
 Each of Gastar, First Texas Development, Inc., Bossier Basin, LLC., and First Source Gas, LP, Buyers herein, represent and warrant to Sellers as follows:

  

	 	6.1	Organization 

  
 Such Buyer is duly organized, validly existing and in good standing under the laws of the state, or, in the case of Gastar, Canadian province, in which
such Buyer was organized. 
  

 14 

	 	6.2	Authorization and Authority 

  
 The execution and delivery of this Agreement and the performance of this Agreement and the transactions contemplated hereby has been duly and validly
authorized by all requisite corporate action on the part of such Buyer. Such Buyer has full power and authority to carry on its business as presently conducted, to enter into this Agreement, to purchase as appropriate the Properties to be
transferred and assigned hereunder on the terms described in this Agreement, and to perform its other obligations under this Agreement. All of the shares of Gastar common stock to be issued to Sellers hereunder are duly authorized and, upon
issuance, will be fully paid and non assessable and free of liens, encumbrances and preemptive rights except, and subject to, the restrictive legends that are required to be placed on said shares of stock. 
  

	 	6.3	Enforceability 

  
 This Agreement has been duly executed and delivered on behalf of such Buyer, and constitutes a legal, valid and binding obligation of such Buyer
enforceable in accordance with its terms, except as enforceability may be limited by Equitable Limitations. All documents required hereunder to be executed and delivered by such Buyer have been duly executed and delivered and constitute the legal,
valid and binding obligations of such Buyer enforceable in accordance with their terms, except as enforceability may be limited by Equitable Limitations. 
  

	 	6.4	Conflicts 

  
 The execution and delivery of this Agreement by such Buyer does not, and the consummation of the transactions contemplated by this Agreement shall not,
(a) violate or be in conflict with, or require the consent of any person or entity under, any provision of such Buyer’s governing documents, (b) conflict with, result in a breach of, constitute a default (or an event that with the
lapse of time or notice, or both, would constitute a default) under any agreement or instrument to which such Buyer is a party or is bound, or (c) violate any provision of or require any consent, authorization or approval under any judgment,
decree, judicial or administrative order, award, writ, injunction, statute, rule or regulation applicable to such Buyer, other than any violation that would not have a MAE. 
  

	 	6.5	Reliance 

  
 Such Buyer has been afforded an opportunity to (a) examine the Properties to be transferred and assigned hereunder and such materials as it has
requested to be provided to it by Sellers, (b) discuss with representatives of Sellers such materials and the nature and operation of those Properties and (c) investigate the condition of the Properties. In entering into this Agreement,
such Buyer has relied solely on the express representations and covenants of Sellers in this Agreement or in the Assignments delivered in connection herewith, its independent investigation of, and judgment with respect to, these Properties and the
advice of its own legal, tax, economic, environmental, engineering, geological and geophysical advisors, and not on any comments or statements of any representatives of, or consultants or advisors engaged by, Sellers or the persons representing
Sellers. 
  

	 	6.6	Qualified Leaseholder 

  
 Such Buyer meets the area-wide bonding and any other bonding requirements of the relevant Bureaus of Land Management, Texas Railroad Commission, and
other governmental authorities, and, after the Closing, such Buyer anticipates that it will continue to be able to meet such bonding requirements. Such Buyer is, and, after the Closing, expects to continue to be, otherwise qualified to own, and
assume operatorship of, the Properties. 
  

 15 

	 	6.7	Litigation and Claims 

  
 There is no action, suit, proceeding, claim or investigation by any person, entity, administrative agency or governmental body pending or, to such
Buyer’s knowledge, threatened against it before any governmental authority that impedes, or is likely to impede, its ability to consummate the transactions contemplated by this Agreement. 
  

	 	6.8	Buyers’ Knowledge 

  
 As used herein, “Buyers’ knowledge” or “Knowledge of Buyers,” means the actual knowledge by J. Russell Porter or Michael
Gerlich. 
  

	7.	Covenants 

  

	 	7.1	Covenant of Sellers 

  
 Each Seller covenants that it will make or give all notifications, filings, consents and approvals, from, to or with all governmental authorities, and
take all actions reasonably requested by Buyers, necessary for, and cooperate with Buyers in obtaining, the issuance, assignment or transfer, as the case may be, by each such authority of such permits or other governmental approvals as may be
necessary for Buyers to own and operate the Properties following the consummation of the transactions contemplated in this Agreement. 
  

	 	7.2	Covenant of Buyers 

  
 In addition to the specific affirmative covenants of Buyer Gastar set forth in Section 4, Buyers, if required by Sellers, shall deliver to Sellers
evidence of the posting of bonds or other security with the Bureau of Land Management, Texas Railroad Commission, State of Texas, and all other applicable governmental authorities, meeting the requirements of those authorities to own and, where
appropriate, operate the Properties. 
  

	 	7.3	Cooperation 

  
 Buyers shall use their individual and collective commercially reasonable efforts to cooperate with Sellers to obtain any such consents or authorizations
necessary to complete the transactions contemplated by this Agreement. 
  

 16 

	8.	Intentionally Omitted 

  

	9.	Closing and Closing Deliveries 

  

	 	9.1	The Closing Date 

  
 The sale, conveyance, transfer and assignment of the Producing and Non Producing Properties and related assets pursuant to this Agreement shall be
consummated on June 16, 2005, or as soon thereafter as is reasonably practicable, (“Closing Date”) at 11:00 a.m. in Gastar’s office in Houston, Texas, or at some other location mutually agreeable to the Parties. 
  

	 	9.2	Documents to be Delivered at Closing 

  

	 	9.2.1	On the Closing Date, Sellers shall deliver to Buyers the following instruments, properly executed by authorized officers and, where appropriate, acknowledged:

  

	 	(a)	This Agreement. 

  

	 	(b)	The Assignment provided for in Section 2.4. 

  

	 	(c)	Intentionally Omitted. 

  

	 	(d)	The Assignments of Contracts and Agreements provided for in Section 2.6. 

  

	 	(e)	Such other instruments as are necessary to effect the conveyances of the Properties and interests to Buyers, as requested by Buyers or their counsel. 

  

	 	(f)	An assignment to Buyers of Sellers’ rights as Operator under the Operating Agreement, either directly or through an affirmative vote, and all fully executed forms, promulgated
by the appropriate governmental authority designating Buyers as the Operator under that JOA. 

  

	 	(g)	Sellers shall deliver on forms supplied by Buyers and reasonably acceptable to Sellers transfer orders or letters in lieu thereof directing all purchasers of production to make
payments to Buyers of proceeds attributable to production from the Producing Properties from and after the Effective Date, for delivery by Buyers to the purchasers of production. 

  

	 	(h)	The Registration Rights Agreement provided for in Section 4.1. 

  

	 	(i)	The amounts held in suspense by Sellers, with a schedule listing all suspense accounts, as provided for in Section 10.4 

  

	 	9.2.2	At the Closing, Buyers shall deliver to Sellers the following instruments, properly executed by authorized officers and, where appropriate, acknowledged: 

 

	 	(a)	This Agreement 

  

	 	(b)	The Promissory Note for Seven Million Dollars ($7,000,000) USD provided for in Section 3.12. 

  

	 	(c)	The shares of Gastar stock provided for in Section 3.1.3. 

  

	 	(d)	The Registration Rights Agreement provided for in Section 4.1. 

  

 17 

	 	(d)	Such other instruments as are necessary to effectuate the transactions contemplated herein, as requested by Sellers or their counsel. 

  

	 	9.3	Payment of Base Purchase Price 

  
 At the Closing, contemporaneously with the delivery of the documents and materials described in Section 9.2 Buyers shall provide to Sellers or
Sellers designee the amount of Twenty Four Million Six Hundred Twenty Thousand Six Hundred Dollars ($24,620,600) USD by certified check or wire transfer of immediately available funds as required by Section 3.1.1. 
  

	10.	Taxes, Prorations and Assumption of Obligations 

  

	 	10.1	Tax Prorations 

  
 Real and personal property taxes for the Properties shall be prorated between Buyers and Sellers as of the Effective Date. If the actual taxes are not
known on the Closing Date, Sellers’ share of such taxes shall be determined by using (a) the rates and millage for the year prior to the year in which the Closing occurs, with appropriate adjustments for any known and verifiable changes
thereto, and (b) the assessed values for the year in which Closing occurs. When Buyers receive the actual tax statements for the Properties from the appropriate taxing authorities, Buyers shall deliver to Sellers a copy of such statements,
together with the amount, if any, by which Sellers’ proration exceeds the proration that would have been made had actual tax statements been used to calculate Sellers’ proration. If the proration for Sellers that would have been made using
actual tax statements exceeds that made at Closing, Sellers shall pay to Buyers such difference within three Business Days of receipt of such statement. 
  

	 	10.2	Severance and Ad Valorem Taxes 

  
 Sellers represent that they have paid all ad valorem and severance taxes attributable to the production from the Properties that have been assessed or
incurred or have become due and payable before the Effective Date, other than taxes that have been contested in good faith. 
  

	 	10.3	Assumption of Obligations 

  
 As of the Effective Date, Buyers assume their share of (a) the obligation to (i) plug and abandon or remove and dispose of all wells,
structures, flow lines, pipelines, and the other equipment now or hereafter located on the Properties (ii) cap and bury all flow lines and other pipelines now or hereafter located on the Properties, and (iii) dispose of naturally occurring
radioactive material and all other pollutants, wastes, contaminants, or hazardous, or extremely hazardous, or toxic materials, substances, chemicals or wastes now or hereafter located on the Properties; (b) all obligations and liabilities
arising from or in connection with any gas production, gas compression, gathering and transmission agreements attributable to coalbed methane gas or natural gas, as applicable, producing from the Properties, whether before, on or after the Effective
Date; and (c) all other costs, obligations and liabilities that arise under the Properties or Contracts or otherwise relate to the Properties and, in each case, arise from or relate to events occurring or conditions existing on or after the
Effective Date or accrue after the Effective Date. All such plugging, replugging, abandonment, removal, disposal, and restoration operations shall be in compliance with applicable laws and regulations and contracts, and shall be conducted in a good
and workmanlike manner. Buyers assume no other obligations than those set forth herein and in any Assignments, Bills of Sale and other documents of conveyance and assumption executed by Buyers hereunder. 
  

 18 

	 	10.4	Suspense Accounts 

  
 On the Closing Date, Sellers shall deliver to Buyers all amounts held in suspense by Sellers that relate to Properties to be sold, conveyed, transferred
and assigned at Closing, together with a 
 schedule listing all suspense accounts. Upon receipt thereof from Sellers, Buyers shall assume
responsibility for and apply such funds in a manner consistent with prudent oil and gas business practices. Buyers hereby indemnify and hold harmless Sellers for any Liability arising from such suspense accounts. 
  

 19 

	11.	Accounting 

  

	 	11.1	Settlement Statement 

  
 In accordance with Section 3.2.4 as soon as practicable and, in any event, no later than sixty (60) calendar days after the Closing Date,
Buyers shall prepare and deliver to Sellers the Settlement Statement setting forth the adjustments to the Base Purchase Price. The Settlement Statement shall be prepared in accordance with customary accounting principles used in the oil and gas
industry. Within thirty (30) calendar days after Sellers’ receipt of the Settlement Statement, Buyers and Sellers shall endeavor to agree on the accounting set forth therein. 
  

	 	11.2	Arbitration of Final Settlement Statement 

  
 If Sellers and Buyers cannot agree upon the Settlement Statement, a certified independent, nationally recognized public accounting firm, selected
mutually by the Parties, shall serve as an arbitrator and decide all points of disagreement with respect to the Settlement Statement, such decision to be binding on both parties. If the parties are unable to agree upon the designation of an
arbitrator, then the arbitration, including the selection of an arbitrator, shall be conducted under the rules of the American Arbitration Association to the extent such rules do not conflict with the terms hereof. The costs and expenses of the
arbitrator shall be shared equally by Sellers and Buyers. 
  

	 	11.3	Payment 

  
 Within five (5) Business Days after the agreement of Sellers and Buyers on the Settlement Statement, or after the decision of the arbitrator, Buyers
or Sellers, as the case may be, shall, consistent with and subject to the provisions of Section 3.2.4, determine the manner in which they will pay the sums as may be found due under the Settlement Statement. 
  

	12.	Survival and Indemnification. 

  

	 	12.1	Survival 

  
 The liability of Buyers and Sellers under each of their respective representations and warranties contained in this Agreement shall survive for two
(2) years from the Effective Date. Any limitations or conditions to said representations and warranties which are reflected in the Exhibits, or which were determined in pre-Closing due diligence investigation, shall be considered to be
incorporated into the representations and warranties. 
  

	 	12.2	Liabilities 

  
 The term “Liabilities” shall mean any and all payments, charges, judgments, assessments, liabilities, damages, penalties, fines or costs and
expenses paid or incurred by the person seeking indemnification, including any legal or other expenses reasonably incurred in connection therewith. 
  

	 	12.3	Indemnification by Sellers 

  
 After the Closing, Sellers shall be responsible for, shall pay on a current basis, and shall indemnify, save, hold harmless, discharge and release
Buyers, all of their affiliates, successors and permitted assignees, and all of their respective stockholders, directors, officers, employees, agents and representatives (collectively, “Buyer Indemnified Parties”) from and against their
share of any and all Liabilities arising from, based upon, related to or associated with (a) any act, omission or event involving or relating to the Properties occurring during the period beginning at which Sellers first had a percentage
interest in the Properties and ending as of the Effective Date, other than obligations and liabilities assumed by Buyer pursuant to Section 10.3; (b) any act or omission by Sellers involving or relating to the Excluded Assets whether
occurring before or after the Effective 
  

 20 

 Date; (c) the material inaccuracy of any representation or warranty of Sellers set forth in this
Agreement or in any other agreement, instrument, document or certificate executed or delivered in connection with this Agreement; (d) the material breach of, or failure to, perform or satisfy, any of the covenants of Sellers set forth in this
Agreement or in any other agreement, instrument, document or certificate executed or delivered in connection with this Agreement; and (e) any liability of Sellers not assumed by Buyers hereunder. Notwithstanding the foregoing, the
Indemnification obligations of Sellers hereunder is limited by and subject to the time limitations set forth in Section 12.1, “Survival.” 
  

	 	12.4	Indemnification by Buyers 

  
 After the Closing, Buyers shall be responsible for, shall pay on a current basis, and shall indemnify, save, hold harmless, discharge and release
Sellers, all of their affiliates, successors and permitted assignees, and all of their respective stockholders, directors, officers, employees, agents and representatives (collectively, “Seller Indemnified Parties”) (Buyer Indemnified
Parties and Seller Indemnified Parties sometimes collectively referred to as “Indemnified Parties”) from and against any and all Liabilities arising from, based upon, related to or associated with (a) any act, omission or event
involving or relating to the Properties first occurring after the Effective Date or assumed by Buyer pursuant to Section 10.3; (b) the material inaccuracy of any representation or warranty of Buyers set forth in this Agreement or in any
other agreement, instrument, document or certificate executed or delivered in connection with this Agreement; (c) the material breach of, or failure to, perform or satisfy, any of the covenants of Buyers set forth in this Agreement or in any
other agreement, instrument, document or certificate executed or delivered in connection with this Agreement; and (d) any liability of Buyers not assumed by Sellers hereunder. Notwithstanding the foregoing, the Indemnification obligations of
Buyer hereunder is limited by and subject to the time limitations set forth in Section 12.1, “Survival.” 
  

	 	12.5	Liability Limitations 

  

	 	12.5.1	Any assertion by any Buyer Indemnified Parties that any Seller is liable (a) for the material inaccuracy of any representation or warranty; (b) for indemnity under the
terms of this Agreement; or (c) otherwise in connection with the transactions contemplated in this Agreement, must be provided by written notice and must be given to the other Party or Parties on or prior to the second anniversary of the
Closing Date. Any assertion by any Seller Indemnified Parties that any Buyer is liable (a) for the material inaccuracy of any representation or warranty; (b) indemnity under the terms of the Agreement; or (c) otherwise in connection
with the transactions contemplated in the Agreement, must be provided by written notice. The notice shall state the facts known that give rise to such notice in sufficient detail to allow the other Party or Parties to evaluate the assertion.

  

	 	12.5.2	None of the Buyer Indemnified Parties shall be entitled to assert any right to indemnification hereunder or to otherwise seek any damages or other remedies for or in connection with
this Agreement or the transactions contemplated in this Agreement until the aggregate amount of the Liabilities actually suffered, exceeds five percent (5%) of the Base Purchase Price, and then only to the extent of such excess.

  

	 	12.5.3	The amount of any Liabilities for which any of the Indemnified Parties is entitled to indemnification or other compensation under this Agreement or in connection with or with
respect to the transactions contemplated in this Agreement shall be reduced by any corresponding (a) tax benefit created or generated or (b) insurance proceeds realized or that could reasonably be expected to be realized by such party if a
claim were properly pursued under the relevant insurance arrangements. 

  

	 	12.5.4	Absent fraud or intentional misconduct, Sellers shall not be required to indemnify any Buyer Indemnified Parties or pay any other amount in connection with this Agreement or with
respect to the transactions contemplated in this Agreement in amounts exceeding in the aggregate fifty percent (50%) of the Base Purchase Price. 

  

 21 

	 	12.5.5	None of the Indemnified Parties shall be entitled to recover any amount for any losses, costs, expenses, or damages arising under this Agreement or in connection with or with
respect to the transactions contemplated in this Agreement in excess of the actual compensatory damages, court costs and reasonable attorney fees, suffered by such party. Buyers on behalf of each of the Buyer Indemnified Parties and Sellers on
behalf of each of the Seller Indemnified Parties waive any right to recover punitive, special, exemplary and consequential damages arising in connection with or with respect to the transactions contemplated in this Agreement.

  

	 	12.5.6	The sole and exclusive remedy of each of the Indemnified Parties with respect to this Agreement and the Transactions contemplated hereby shall be pursuant to the express
indemnification provisions of this Section 12. Any and all (a) claims relating to the representations, warranties, covenants and agreements contained in this Agreement, (b) other claims pursuant to or in connection with this Agreement
or (c) other claims relating to the Properties and the purchase and sale thereof shall be subject to the provisions set forth in this Section 12. Except for claims made pursuant to the express indemnification provisions of this
Section 12, Buyers on behalf of each of the Buyer Indemnified Parties and Sellers on behalf of each of the Seller Indemnified Parties shall be deemed to have waived, to the fullest extent permitted under applicable law, any right of
contribution against the other Party or any of its affiliates and any and all rights, claims and causes of action it may have against the other Party or any of its affiliates, arising under or based on any federal, state or local statute, law,
ordinance, rule or regulation or common law or otherwise. 

  

	 	12.5.7	No person entitled to indemnification hereunder or otherwise to damages in connection with or with respect to the transactions contemplated in this Agreement shall settle,
compromise or take any other action with respect to any claim, demand, assertion of liability or legal proceeding that could prejudice or otherwise adversely impact the ability of the person providing such indemnification or potentially liable for
such damages to defend or otherwise settle or compromise with respect to such claim, demand, assertion of liability or legal proceeding. 

  

	 	12.5.8	Sellers and Buyers acknowledge that the payment of money, as limited by terms of this Agreement, shall be adequate compensation for breach of any representation, warranty, covenant
or agreement contained herein. 

  

	 	12.5.9	Each person entitled to indemnification hereunder or otherwise to damages in connection with the transactions contemplated in this Agreement shall take all reasonable steps to
mitigate all losses, costs, expenses and damages after becoming aware of any event or circumstance that could reasonably be expected to give rise to any losses, costs, expenses and damages that are indemnifable or recoverable hereunder or in
connection herewith. 

  

	 	12.5.10	At the option of any Seller, any amounts due and payable by such Seller to any Buyer under this Article 12 may be paid by such Seller (1) in cash; (2) by setting off an
equal amount payable by Buyers pursuant to the Promissory Notes; (3) by delivering to Buyers a number of shares of Gastar common stock with a value equal to the amount payable by Seller, with the number of shares determined by dividing the
amount due by the volume weighted five (5) day average trading price of Gastar stock on the Toronto Stock Exchange (“TSE”) for the period of the last five (5) trading days on the TSE prior to the date the amount due is finally
determined. For example, if the amount due is Six Million Dollars ($6,000,000) (USD), and the volume weighted five (5) day average trading price of Gastar stock on the TSE is Three Dollars ($3.00) per share (USD), the number of shares of Gastar
stock due would be Two Million (2,000,000); ($6,000,000/$3.00 = 2,000,000); or (4) by any combination of the foregoing. 

  

 22 

	 	12.5.11	THE INDEMNIFICATION, RELEASE AND ASSUMPTION PROVISIONS PROVIDED FOR IN THIS AGREEMENT SHALL BE APPLICABLE WHETHER OR NOT THE LOSSES, COSTS, EXPENSES AND DAMAGES IN QUESTION AROSE IN
WHOLE OR IN PART FROM THE ACTIVE, PASSIVE OR CONCURRENT NEGLIGENCE, STRICT LIABILITY OR OTHER FAULT OF ANY INDEMNIFYING PARTY. BUYERS AND SELLERS ACKNOWLEDGE THAT THIS STATEMENT COMPLIES WITH THE EXPRESS NEGLIGENCE RULE AND IS CONSPICUOUS.

  

	 	12.5.12	Sellers shall not have any obligation or liability under this Agreement or in connection with or with respect to the transactions contemplated in this Agreement for any
(i) breach, misrepresentation or noncompliance with respect to any representation, warranty, covenant, or obligation or (ii) any indemnity (a) if such breach, misrepresentation, noncompliance or indemnity rights shall have been waived
by Buyers, (b) if Buyers had knowledge of the relevant facts at or before Closing or (c) if Buyers should have known, in the exercise of reasonable diligence, of the relevant facts at or before Closing. 

  

	 	12.6	Waiver of Representations 

  

	 	12.6.1	THE EXPRESS REPRESENTATIONS OF SELLERS CONTAINED IN THIS AGREEMENT ARE EXCLUSIVE AND ARE IN LIEU OF ANY OTHER REPRESENTATION OR WARRANTY WITH RESPECT TO THE ENVIRONMENTAL CONDITION,
BOTH SURFACE AND SUBSURFACE, OR OTHER CONDITION OF THE PROPERTIES; OR THE OWNERSHIP OR OPERATION OF THE PROPERTIES OR ANY PART THEREOF OR ANY OTHER MATTERS. 

  

	 	12.6.2	SELLERS EXPRESSLY DISCLAIM AND NEGATE, AND BUYERS HEREBY WAIVE, ANY LIABILITY OR RESPONSIBILITY FOR, (I) ANY REPRESENTATION OR WARRANTY WITH RESPECT TO THE QUALITY, QUANTITY OR
VOLUME OF THE RESERVES, IF ANY, OF GAS OR OTHER HYDROCARBONS IN OR UNDER THE PROPERTIES; AND (II) ANY WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, AS TO THE QUALITY, MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, CONFORMITY TO SAMPLES, OR
CONDITION OF ANY OF THE PROPERTIES OR ANY PART THERETO. 

  

	 	12.6.3	EXCEPT FOR THE EXPRESS REPRESENTATIONS CONTAINED IN THIS AGREEMENT, THE ITEMS OF EQUIPMENT, PERSONAL PROPERTY, FIXTURES, PHYSICAL FACILITIES, RIGS, DRILLING EQUIPMENT, COLLECTION
EQUIPMENT, PUMPS, CASING, IMPROVEMENTS, FIXTURES AND APPURTENANCES CONVEYED AS PART OF THE PROPERTIES ARE SOLD, AND BUYER ACCEPTS SUCH ITEMS “AS IS, WHERE IS, WITH ALL FAULTS.” 

  

	 	12.6.4	BUYERS ACKNOWLEDGE THAT THE WAIVERS IN THIS SECTION 12.6 ARE CONSPICUOUS. 

  

	13.	Further Assurances 

  

	 	13.1	General 

  
 After the Closing, Sellers and Buyers shall execute, acknowledge and deliver or cause to be executed, acknowledged and delivered such instruments and
take such other action as may be necessary or advisable to carry out their obligations under this Agreement and under any exhibit, document, certificate or other instrument delivered pursuant hereto. 
  

 23 

	 	13.2	Like-Kind Exchange 

  
 Either of Sellers and Buyers may consummate (and the other Parties represent and commit that they shall reasonably cooperate with) the sale/acquisition
of the Properties as part of a so-called like kind exchange (the “Exchange”) pursuant to Section 1031 of the Internal Revenue Code of 1986, as amended, provided that; (i) the Closing shall not be delayed or affected by reason of
the Exchange, nor shall the consummation or accomplishment of the Exchange be a condition precedent or condition subsequent to any party’s obligations under this Agreement; and (ii) no Party shall be required to acquire or hold title to
any real property for purposes of consummating the other party’s Exchange; and (iii) neither Party shall incur any cost or liability in connection with the other Party’s exchange. No Party shall, by this Agreement or acquiescence to
the other Party’s Exchange, have its rights under this Agreement affected or diminished in any manner or be responsible for compliance with or be deemed to have warranted to the other party that any Exchange in fact complies with
Section 1031 of the Internal Revenue Code of 1986, as amended. 
  

	 	13.3	Filings, Notices and Certain Governmental Approvals 

  
 Promptly after Closing Buyers shall (a) record the assignments of the Properties executed at the Closing in all applicable real property records,
(b) send notices to vendors supplying goods and services for the Properties of the assignment of the Properties to Buyers and of the designation of Buyer as the Operator of the Texas Properties thereof, (c) actively pursue the
unconditional approval by the Texas Railroad Commission, state of Texas, and all other applicable governmental authorities of the assignment of the Properties to Buyers and the designation of Buyers as the operator thereof, and (d) actively
pursue all other consents and approvals that may be required in connection with the assignment of the Properties to Buyers, and the assumption of the liabilities assumed by Buyers hereunder, and that shall not have been obtained prior to Closing.
Buyers obligate themselves to take any and all action required by the Texas Railroad Commission, state of Texas, or any other regulatory agency in order to obtain such unconditional approval, including but not limited to, the posting of any and all
bonds or other security that may be required in excess of its existing lease, pipeline or area-wide bond. 
  

	14.	Access to Records after Closing 

  

	 	14.1	Access by Buyers 

  
 After the Closing Date, Buyers and their authorized representatives shall have reasonable access (at Buyers’ sole cost and expense) during
Sellers’ normal business hours to all books and records of Sellers pertaining to the Properties for periods prior to the Effective Date for the purpose of prosecuting or defending claims, lawsuits or other proceedings, for audit purposes, or to
comply with legal process, rules, regulations or orders of any governmental authority. Buyers at their sole expense, may copy such records they deem appropriate. Sellers agree to maintain such books and records for a minimum of seven (7) years
after Closing. 
  

	 	14.2	Access by Sellers 

  
 After the Closing Date, Sellers and their authorized representatives shall have reasonable access (at Seller’s sole cost and expense) during
Buyers’ normal business hours to all books and records in the possession of Buyers (to the extent that Sellers have not retained a copy thereof) pertaining to the Properties for periods from to the Effective Date for the purpose of prosecuting
or defending claims, lawsuits or other procedures, for audit purposes, or to comply with legal process, rules, regulations or orders of any governmental authority. Sellers at their own expense may copy such records as they deem appropriate. Buyers
agree to maintain such books and records for a minimum of seven (7) years after Closing. Buyers shall provide Sellers with a 
  

 24 

 description and listing of the actual costs incurred by Buyers attributable to the drilling and
completion of wells on the Texas Properties, including supporting data and records reasonably requested by Sellers. These cost amount reports shall be provided every quarter for those costs actually incurred by Buyers attributable to the drilling
and completion of wells on the Texas Properties in the previous quarter. 
  

	15.	Notices 

  
 All notices required or permitted under this Agreement shall be in writing and, (a) if by air courier, shall be deemed to have been given one
Business Day after the date deposited with a recognized carrier of overnight mail, with all freight or other charges prepaid, (b) if by telecopier, shall be deemed to have been given when actually received, and (c) if mailed, shall be
deemed to have been given three Business Days after the date when sent by registered or certified mail, postage prepaid, addressed as follows: 
  

			
	To Buyers:	  	Gastar Exploration, Ltd.
	 	  	First Texas Development, Inc.
	 	  	Bossier Basin, LLC
	 	  	First Source Gas, LP
	 	  	1331 Lamar, Suite 1080
	 	  	Houston, Texas 77010
	 	  	Attn: J. Russell Porter, President and Chief Executive Officer
	 	  	Telecopier: (713) 739-0458
		
	To Sellers:	  	Geostar Corporation
	 	  	First Source Texas, Inc.
	 	  	First Source Bossier, LLC
	 	  	First Texas Gas, LP
	 	  	2480 W. Campus Drive, Building C
	 	  	Mt. Pleasant, MI 48858
	 	  	Attn: Thom Robinson, President
	 	  	Telecopier: (989) 773-0006
		
	To Counsel:	  	William R. Jansen, Esq.
	 	  	Warner Norcross & Judd LLP
	 	  	2000 Town Center, Suite 2700
	 	  	Southfield, Michigan 48075
	 	  	Telecopier: (248) 784-5150

  

	16.	Assignment 

  
 Except as necessary to effect an Exchange as contemplated by Section 13.2, neither Sellers nor Buyers may assign their rights or delegate their
duties or obligations arising under this Agreement, in whole or in part, by operation of law or otherwise, before or after Closing, without the prior written consent of the other Party, which consent shall not be unreasonably withheld. 

 

	17.	Governing Law 

  
 This Agreement shall be governed and construed in accordance with the laws of the State of Michigan without giving effect to any principles of conflicts
of laws. The validity of the various conveyances affecting title to real property shall be governed by and construed in accordance with the laws of the jurisdiction in which such property is situated. The representations and warranties contained in
such conveyances and the remedies available because of a breach of such representations and warranties shall be governed by and construed in accordance with the laws of the State of Michigan without giving effect to the principles of conflicts of
laws. 
  

 25 

	18.	Expenses and Fees 

  
 Whether or not the transactions contemplated by this Agreement are consummated, each of the Parties hereto shall pay the fees and expenses of its counsel,
accountants and other experts incident to the negotiation and preparation of this Agreement and consummation of the transactions contemplated hereby. Buyers shall be responsible for the cost of all fees for the recording of transfer documents and
any sales, transfer, stamp or other excise taxes resulting from the transfer of the Producing Properties to Buyers. All other costs shall be borne by the Party incurring such costs. 
  

	19.	Integration 

  
 This Agreement, including the Exhibits, and the other agreements to be entered into by the Parties under the provisions of this Agreement executed by
Buyer and Seller sets forth the entire agreement and understanding of the Parties in respect of the transactions contemplated hereby and supersedes all prior agreements, prior arrangements and prior understandings relating to the subject matter
hereof. 
  

	20.	Waiver or Modification 

  
 This Agreement may be amended, modified, superseded or cancelled, and any of the terms, covenants, representations, warranties or conditions hereof may be
waived, only by a written instrument executed by a duly authorized officer of Buyer and Seller, or, in the case of a waiver or consent, by or on behalf of the Party or Parties waiving compliance or giving such consent. The failure of any Party at
any time or times to require performance of any provision of this Agreement shall not affect its right at a later time to enforce such provision. No waiver by any Party of any condition, or of any breach of any covenant, agreement, representation or
warranty contained in this Agreement, in any one or more instances, shall be deemed to be or construed as a further or continuing waiver of any such condition or breach or waiver of any other condition or of any breach of any other covenant,
agreement, representation or warranty. 
  

 26 

	21.	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 hereof, such
provision shall be fully severable; this Agreement shall be construed and enforced as if such illegal, invalid or unenforceable provision had never comprised a part hereof; and the remaining provisions of this 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. 
  

	22.	Multiple Counterparts 

  
 This Agreement may be executed in a number of identical counterparts, each of which for all purposes is to be deemed an original, and all of which
constitute, collectively, one agreement. In addition, this Agreement may be executed in a number of counterparts, any one of which may contain the execution of either Buyer or Seller, and all of such counterparts taken together shall constitute one
completely executed original agreement. 
  

	23.	Public Announcements 

  
 Upon one Party requesting consent to make a public announcement, each Party agrees to exercise its best efforts to agree upon the text of a joint public
announcement or statement to be made by both Buyers and Sellers. Nothing contained in this Section shall be construed to require either Party to obtain approval of the other party hereto to disclose information with respect to the transactions
contemplated by this Agreement to any state or federal governmental authority or agency to the extent required by applicable law or by any applicable rules, regulations or orders of any governmental authority or agency having jurisdiction or
necessary to comply with disclosure requirements of securities exchange or any applicable securities laws. 
  

	24.	Conflict Waiver 

  
 Buyers and Sellers each acknowledge that they have requested the law firm of Warner Norcross & Judd LLP to prepare this Purchase and Sale
Agreement and Assignment of Interests, and to further prepare all Exhibits and Schedules in connection therewith. Warner Norcross & Judd LLP has not negotiated any portion of the terms contained herein, nor has it negotiated the Exhibits or
Schedules attached or to be attached hereto, but has merely attempted to reduce to writing the agreements reached between the Parties. Buyers and Sellers have been advised that a conflict of interest exists between their respective interests. As a
result, Buyers and Sellers have been advised to consider seeking the advice of their own independent counsel. Each of Buyers and Sellers hereby acknowledge that it had ample opportunity to do so, has obtained such independent advice as it deems
necessary, or has elected not to seek such independent advice. Each of Buyers and Sellers further acknowledge and agree that any and all claims against Warner Norcross & Judd LLP regarding any possible conflict of interest with regard to
this Agreement, the Exhibits and Schedules hereunder, the preparation thereof, the Closing pursuant thereto, and the results of or performance under the Closing, are now and are forever irrevocably waived. 
  

	25.	Termination by Sellers 

  
 Sellers may, in their sole discretion, terminate this Agreement and all obligations of both Buyers and Sellers hereunder, if funding for the amounts due
Sellers hereunder is not received by Sellers or their designees by 5:00 p.m. (E.S.T.) Friday, June 17, 2005. 
  

 27 

 EXECUTED and delivered as of the date first written above. 
  

			
	“SELLERS”
	
	GEOSTAR CORPORATION
		
	By:	 	 /s/ JOHN W. PARROTT

	 	 	John W. Parrott, Vice President
	
	FIRST SOURCE TEXAS, INC.
		
	By:	 	 /s/ JOHN W. PARROTT

	 	 	John W. Parrott, Vice President
	
	FIRST SOURCE BOSSIER, LLC
		
	By:	 	 /s/ JOHN W. PARROTT

	 	 	John W. Parrott,
	 	 	on behalf of its Managing Member
	
	FIRST TEXAS GAS LP
		
	By:	 	 /s/ JOHN W. PARROTT

	 	 	John W. Parrott,
	 	 	on behalf of its General Partner
	
	“BUYERS”
	
	GASTAR EXPLORATION LTD.
		
	By:	 	 /s/ J. RUSSELL PORTER

	 	 	J. Russell Porter, President and
	 	 	Chief Executive Officer
	
	FIRST TEXAS DEVELOPMENT, INC.
		
	By:	 	 /s/ J. RUSSELL PORTER

	 	 	J. Russell Porter, President
	
	BOSSIER BASIN, LLC
		
	By:	 	 /s/ J. RUSSELL PORTER

	 	 	J. Russell Porter,
	 	 	on behalf of its Managing Member
	
	FIRST SOURCE GAS, LP
		
	By:	 	 /s/ J. RUSSELL PORTER

	 	 	J. Russell Porter,
	 	 	on behalf of its General Partner

  

 28

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