Exhibit 10.1

                                TABLE OF CONTENTS
                                                                     Page
ARTICLE 1
         INTERPRETATION................................................2
         1.1      Definitions..........................................2
         1.2      Headings, meaning of "hereof", and Article
                   and Schedule References............................13
         1.3      Single and Plural and Gender........................13
         1.4      Currency............................................13
         1.5      "Including".........................................13
         1.6      Knowledge...........................................13
         1.7      Schedules...........................................14
         1.8      Conflicts...........................................14
         1.9      Statute References..................................15

ARTICLE 2
         PURCHASE AND SALE............................................15
         2.1      Purchase and Sale...................................15
         2.2      Purchase Price......................................15
         2.3      Deposit.............................................15
         2.4      Payment.............................................16
         2.5      Purchase Price Adjustment and Post
                   Closing Adjustments................................17

ARTICLE 3
         REPRESENTATIONS, WARRANTIES AND COVENANTS....................17
         3.1      Regarding the Seller and the Shares:................17
         3.2      Regarding Grey Wolf.................................19
         3.3      Regarding Canadian Abraxas..........................24
         3.4      Regarding the Assets................................29
         3.5      Negation............................................32
         3.6      Purchaser's Representations and Warranties..........33
         3.7      Right to Purchase Mirant GORR.......................33

ARTICLE 4
         TAX MATTERS..................................................34
         4.1      Withholding Requirement.............................34
         4.2      Tax Returns.........................................36
         4.3      Tax Indemnity.......................................37

ARTICLE 5
         CLOSING PERIOD...............................................39
         5.1      Pre-Closing Activities..............................39
         5.2      Insurance...........................................41
         5.3      Due Diligence.......................................41
         5.4      Required Approvals..................................41
         5.5      Tax Elections.......................................41
                                      -i-

                               TABLE OF CONTENTS
                                  (continued)
                                                                    Page
ARTICLE 6
         CONDITIONS...................................................42
         6.1      Conditions for the Benefit of the Purchaser.........42
         6.2      Conditions for the Benefit of the Seller............43
         6.3      Efforts to Satisfy Conditions.......................45
         6.4      Asset Sale Alternative..............................45
         6.5      Closing Extension...................................45

ARTICLE 7
         CLOSING......................................................45
         7.1      Closing.............................................45
         7.2      Deliveries by the Seller at Closing.................45
         7.3      Deliveries by the Purchaser at Closing..............46
         7.4      Closing Escrow......................................46

ARTICLE 8
         ENVIRONMENTAL INDEMNITY......................................47
         8.1      Indemnity...........................................47

ARTICLE 9
         GENERAL INDEMNITIES..........................................47
         9.1      Seller's Indemnity..................................47
         9.2      Purchaser's Indemnity...............................47
         9.3      Limitations on Seller's Indemnity...................48
         9.4      Indemnification Procedure...........................49
         9.5      Specific Claim Indemnity............................50

ARTICLE 10
         EMPLOYEES....................................................50
         10.1     Choosing Employees..................................50
         10.2     Recognition of Service..............................51
         10.3     Retained Employees..................................51
         10.4     Transfer Employees..................................51
         10.5     Asset Transaction...................................52
         10.6     Transitional Assistance.............................52

ARTICLE 11
         DUE DILIGENCE................................................52
         11.1     Title Opinions......................................52
         11.2     Pre-Closing Title Review............................53
         11.3     Termination Right...................................53
         11.4     Arbitration.........................................53
                                      -ii-

                                TABLE OF CONTENTS
                                   (continued)
                                                                    Page
ARTICLE 12
         SURVIVAL.....................................................54
         12.1     Survival............................................54

ARTICLE 13
         TERMINATION..................................................54
         13.1     Termination.........................................54

ARTICLE 14
         ARBITRATION..................................................55
         14.1     Procedure...........................................55

ARTICLE 15
         GENERAL......................................................56
         15.1     Further Assurances..................................56
         15.2     Time of the Essence.................................56
         15.3     Cooperation.........................................56
         15.4     Expenses............................................56
         15.5     Public Announcements................................56
         15.6     Benefit of the Agreement............................56
         15.7     Entire Agreement....................................57
         15.8     Amendments and Waiver...............................57
         15.9     Assignment..........................................57
         15.10    Notices.............................................57
         15.11    Change of Companies' Names..........................58
         15.12    Governing Law.......................................58
         15.13    No Duplication of Adjustments.......................59
         15.14    Interest............................................59
         15.15    PrimeWest Energy Inc. Guarantee.....................59
         15.16    Counterpart Execution................................1

                                     -iii-




                           PURCHASE AND SALE AGREEMENT

                                      among



                          ABRAXAS PETROLEUM CORPORATION



                                    as Seller

                                       and

                               PRIMEWEST GAS INC.

                                  as Purchaser

                                       and

                              PRIMEWEST ENERGY INC.

                                  as Guarantor

                                       and

                         CANADIAN ABRAXAS PETROLEUM LTD.

                                       and

                           GREY WOLF EXPLORATION INC.

                                as the Companies





                                November 21, 2002



                           PURCHASE AND SALE AGREEMENT

         THIS AGREEMENT made this 21st day of November, 2002;

AMONG:

              ABRAXAS PETROLEUM CORPORATION, a body corporate incorporated under
              the laws of Nevada (hereinafter referred to as "Abraxas")

                                     - and -

              CANADIAN ABRAXAS PETROLEUM LIMITED, a body corporate  incorporated
              under the laws of Alberta  (hereinafter  referred to as  "Canadian
              Abraxas")

                                     - and -

              GREY WOLF EXPLORATION  INC., a body corporate  incorporated  under
              the laws of Alberta (hereinafter referred to as "Grey Wolf")

                                     - and -

              PRIMEWEST  ENERGY INC., a body  corporate  incorporated  under the
              laws of Alberta (hereinafter referred to as "PEI")


              PRIMEWEST GAS INC., a body corporate  incorporated  under the laws
              of Alberta (hereinafter referred to as the "Purchaser")


         WHEREAS Abraxas is the registered and beneficial  owner of the Canadian
Abraxas Shares;

         AND  WHEREAS  Abraxas  and  Canadian  Abraxas  are the  registered  and
beneficial owners of the Grey Wolf Shares;

         AND WHEREAS the Seller desires to sell the Canadian  Abraxas Shares and
the Grey Wolf Shares owned by it to the Purchaser  upon and subject to the terms
and conditions hereinafter set forth;

         AND WHEREAS the  Purchaser  desires to purchase  the  Canadian  Abraxas
Shares  and the Grey Wolf  Shares  owned by  Abraxas  from the  Seller  upon and
subject to the terms and conditions hereinafter set forth.

         NOW THEREFORE THIS AGREEMENT  WITNESSES  that in  consideration  of the
premises and the covenants and  agreements  herein  contained the parties hereto
agree as follows:



                                   ARTICLE 1
                                 INTERPRETATION

1.1      Definitions

         In this Agreement, unless otherwise stated or the context otherwise
requires:

         (1)"Abandonment and Reclamation  Liabilities"  means all obligations to
            abandon the Wells and restore and reclaim the surface sites thereof,
            to decommission and remove the Facilities and equipment comprised in
            the  Tangibles and restore and reclaim the surface sites thereof and
            to reclaim and restore the lands to which the Surface Rights relate,
            including  such  obligations  relating to Wells which were abandoned
            prior to the Adjustment Date;

         (2)"Accepted Environmental and Reclamation Liabilities" means:

            (i)   Abandonment and  Reclamation  Liabilities in respect of Wells,
                  whether  producing or not,  including  those which were in the
                  course of actively being abandoned on the Adjustment  Date, or
                  are  drilled  after the  Adjustment  Date,  and which would be
                  expected if the Wells were drilled and operated in  accordance
                  with accepted Canadian oil and gas practices;

            (ii)  Abandonment   and   Reclamation   Liabilities  in  respect  of
                  Facilities  which  were  in  use  on the  Adjustment  Date  or
                  constructed  after  the  Adjustment  Date and  which  would be
                  expected if the Facilities  were  constructed  and operated in
                  accordance with accepted Canadian oilfield practices;

            (iii) Environmental  and Reclamation  Liabilities  arising after the
                  Adjustment  Date  as  a  result  of  activities  conducted  in
                  accordance with accepted Canadian oilfield practices; and

            (iv)  all Environmental and Reclamation Liabilities disclosed in the
                  Environmental Report;

         (3)"Adjusted Purchase Price" has the meaning specified in Section 2.2;

         (4)"Adjustment Date" means October 1, 2002;

         (5)"Affiliate" of an entity means a person or entity that controls,  is
            controlled  by or is under common  control with the subject  entity.
            For the  purpose  of this  definition,  control  means the  ability,
            directly  or  indirectly,  to direct  the  voting of more than Fifty
            Percent (50%) of the voting interests of an entity;

         (6)"Agreement"  means this Purchase and Sale  Agreement,  as amended by
            amendments made after the date hereof by written  agreement  between
            the Seller and the Purchaser;

         (7)"Applicable  Law" means,  in  relation  to any  Person,  property or
            circumstance:

            (i)   statutes (including regulations enacted thereunder);
                                       2

            (ii)  judgments and orders of courts of competent jurisdiction;

            (iii) regulations  and orders  issued by  governmental  agencies and
                  authorities; and

            (iv)  the terms and conditions of permits, licenses,  authorizations
                  or approvals issued by governmental agencies or authorities;

                  which are applicable to such Person, property or circumstance;

         (8)   "Assets"  mean  any  and  all  assets,   properties   and  rights
               beneficially   owned  by  the   Companies,   whether   vested  or
               contingent, including the Oil and Gas Assets and Working Capital;

         (9)   "Auditors" means Deloitte & Touche L.L.P., chartered accountants;

         (10)  "Base Price" means $217,000,000  representing the total amount to
               be paid by the  Purchaser  for the purchase of the Shares  before
               any adjustments are applied;

         (11)  "Business  Day"  means a day  other  than a  Saturday,  Sunday or
               statutory holiday in Calgary, Alberta or San Antonio, Texas;

         (12)  "Canadian Abraxas Shares" means all of the issued and outstanding
               shares of Canadian Abraxas;

         (13)  "Canadian  Tax Act" means the Income  Tax Act R.S.C.  1985,  c. 1
               (5th Supplement) as amended and the Income Tax Regulations;

         (14)  "Claim" means any claim, demand, lawsuit, proceeding, arbitration
               or governmental investigation;

         (15)  "Closing"  means the completion of the  transactions  of purchase
               and sale of the  Shares by the Seller to the  Purchaser  pursuant
               hereto;

         (16)  "Closing Date" means December 31, 2002, unless changed to another
               date pursuant hereto;

         (17)  "Companies" means collectively Grey Wolf and Canadian Abraxas and
               "Company" means one of them;

         (18)  "Companies'  Debt"  means the amount of the  indebtedness  of the
               Companies  pursuant  to  the  Mirant  Credit  Agreement  and  the
               Indentures;

         (19)  "Confidentiality  Agreement" means the Confidentiality  Agreement
               dated July 19, 2002 between PEI and the Seller;

         (20)  "Creditors' Rights" has the meaning specified in Section 3.1(2);

         (21)  "December 21, 1999  Indenture"  means that Trust  Indenture dated
               December 21, 1999 among Abraxas and Canadian Abraxas, as Issuers,
               and  Firstar  Bank,  N.A.  as Trustee  and others as  guarantors,
                                       3


               relating  to the  issuance of US  $196,800,000  in 11 1/2% Senior
               Secured Notes due 2004, Series A;

         (22)  "Deposit" has the meaning specified in Section 2.3;

         (23)  "Deposit Interest" has the meaning specified in Section 2.3;

         (24)  "Dollars" or "$" means dollars of lawful currency of Canada;

         (25)  "Employees"  means Grey Wolf's  current  employees  identified in
               Schedule L;

         (26)  "Employee  Plan"  means any  employee  benefit  plan,  program or
               arrangement sponsored, maintained or contributed to by the Seller
               or the  Companies  for  the  benefit  of Grey  Wolf's  employees,
               including,  without limitation,  bonus; pension;  savings; profit
               sharing;  deferred compensation;  supplemental retirement income;
               stock option;  stock  purchase;  and hospital,  medical,  dental,
               disability, automobile, life and accident insurance plans;

         (27)  "Encumbrance" means a Security Interest, an option to purchase, a
               farmout  agreement  under  which  earning  has  not  occurred,  a
               royalty,  a net profits interest,  a carried working interest,  a
               right to convert a royalty to a working  interest  on payout of a
               well,   a  penalty   or   forfeiture   arising  as  a  result  of
               non-participation  in a drilling or other operation and any other
               encumbrance, whether similar or dissimilar to the foregoing;

         (28)  "Environment"  includes air, soil,  ground water,  surface water,
               aquifers and plant and animal life;

         (29)  "Environmental  Law" means any Applicable Law intended to protect
               or preserve the  Environment  and any  Applicable Law relating to
               the storage,  handling,  transportation,  use, spill,  release or
               emission of toxic or hazardous substances;

         (30)  "Environmental  and  Reclamation  Liabilities"  means  all of the
               Environmental   Liabilities   and   Abandonment  and  Reclamation
               Liabilities  relating to the Oil and Gas Assets (whether  arising
               prior to, on or after the Adjustment Date);

         (31)  "Environmental  Liabilities"  means  any and all  Liabilities  in
               respect of the Environment, including:

               (i)  Liabilities in respect of contamination,  pollution or other
                    damage to the Environment;

               (ii) Liabilities  in  respect of damage  caused by the  presence,
                    storage,   disposal,   transportation,   release,  spill  or
                    emission of any  substance  (including  any form of energy),
                    including, without limitation, corrosion or deterioration of
                    structures  or other  property  and death or injury to human
                    beings, plants or animals;
                                       4

               (iii)Liabilities for the remediation,  restoration or reclamation
                    of  the   Environment   (other  than  the   Abandonment  and
                    Reclamation Liabilities); and

               (iv) Liabilities under Environmental Laws;

         (32)  "Escrow Agent" has the meaning specified in Section 2.3;

         (33)  "Excluded  Oil and Gas Assets" means those Oil and Gas Assets and
               other  assets   described  in  Schedule  O,  including,   without
               limitation, the Office Lease;

         (34)  "Existing  Title  Defects"  means the defects which affect any of
               the Oil and Gas  Assets  and  which  are  disclosed  in the Title
               Opinions;

         (35)  "Facilities"  means  the  tangible  property,  apparatus,  plant,
               equipment,  machinery and facilities described in Schedules E and
               N;

         (36)  "Farmor"  means the  Affiliate  of the Seller  identified  as the
               "Farmor" in each of the Farmout Agreements;

         (37)  "Farmor  Guarantee"  means  the  guarantee  in the form  attached
               hereto as Schedule U;

         (38)  "Farmout  Agreements"  means  agreements in the forms attached as
               Schedule "P";

         (39)  "Financial  Statements" means the audited financial statements of
               the  Companies  for the period  ended  December  31, 2001 and the
               unaudited  statements  for the period ended  September  30, 2002,
               which are attached hereto as Schedule A;

         (40)  "GAAP" means  generally  accepted  accounting  principles used in
               Canada from time to time;

         (41)  "Gas and Oil Sales  Contracts"  means  contracts for the sale and
               purchase of Petroleum Substances;

         (42)  "Grey Wolf Shares" means all of the issued and outstanding shares
               of Grey Wolf;

         (43)  "Indentures" means the March 26, 1999 Indenture, the December 21,
               1999 Indenture and the January 27, 1998 Indenture;

         (44)  "Interim  Interest"  means the amount of simple  interest  at the
               Prime Rate on the Base Price,  computed from the Adjustment  Date
               to December 20, 2002;

         (45)  "Interim  Period  Excluded Assets Net Revenues" means the Interim
               Period  Revenues  minus the  Interim  Period  Costs,  where:

               (i)  "Interim Period Revenues" are the revenues and proceeds from
                    sales or otherwise  which accrue to the Companies in respect
                                       5


                    of  the  Excluded  Assets  during  the  Pre-Closing  Period,
                    determined in accordance with GAAP;

               (ii) "Interim  Period  Costs"  are  the  aggregate  of all  costs
                    (including  capital costs,  operating  costs and maintenance
                    costs)  accrued to the  Companies in respect only of the Oil
                    and  Gas  Assets  which  are  Excluded   Assets  during  the
                    Pre-Closing Period,  determined in accordance with GAAP plus
                    an  amount of $678 per day to  account  for the  portion  of
                    corporate overhead applicable to the Excluded Assets;

               (iii)costs and  expenses  of work  done,  services  provided  and
                    goods  supplied  shall be deemed to accrue  when the work is
                    done or the goods or services are  provided,  regardless  of
                    when such costs and expenses become payable;

               (iv) revenues  from  the  sale of  Petroleum  Substances  will be
                    deemed  to  accrue  when  such   Petroleum   Substances  are
                    produced; and

               (v)  all rentals and similar payments in respect of the Leases or
                    Surface  Rights  comprised  in the  Excluded  Assets and all
                    Taxes (other than goods and services or income taxes) levied
                    with   respect  to  the  Excluded  Oil  and  Gas  Assets  or
                    operations in respect  thereof shall be apportioned on a per
                    diem basis as of the Adjustment Date;

         (46)  "January 27, 1998  Indenture"  means that Trust  Indenture  dated
               January 27, 1998 among Abraxas and Canadian Abraxas,  as Issuers,
               and IBJ Schroder Bank and Trust Company, as Trustee,  relating to
               the  issuance of US  $60,000,000  11 1/2% Senior  Notes due 2004,
               Series C and US  $275,000,000  11 1/2 % Senior  Notes  due  2004,
               Series D;

         (47)  "Land Sales  Acquisitions"  means the  interests  in Crown Leases
               acquired by the Companies at land sales, if any, conducted by the
               Government  of the  Provinces  of  Alberta,  British  Columbia or
               Saskatchewan  between the  Adjustment  Date and the Closing Date,
               and any  other  acquisitions  of oil and gas  lands or  interests
               (whether by acquisition, leasing, the exercise of rights of first
               refusal  or  otherwise)   made  by  the  Companies   between  the
               Adjustment Date and the Closing Date;

         (48)  "Lands"  means  the  lands  or  interests  therein  described  in
               Schedule  E,  subject  to  such   limitations  as  to  geological
               formations and substances and such  Encumbrances as may appear in
               Schedule E;

         (49)  "Leases"  means the petroleum  and natural gas leases,  licenses,
               permits and similar instruments listed in Schedule E by virtue of
               which the holder thereof is entitled to drill for, produce,  save
               and market Petroleum  Substances from the Lands and includes,  if
               applicable, all renewals and extensions of such leases, licenses,
               permits and instruments and all documents  issued in substitution
               therefor;

         (50)  "Liabilities"  means all  liabilities  and  obligations,  whether
               under common law, in equity, under Applicable Law, under contract
                                       6


               or  otherwise,  whether  tortious,   contractual,   statutory  or
               otherwise,  whether  absolute or contingent  and whether based on
               fault, strict liability or otherwise;

         (51)  "Losses"  means,  in  respect of a Person  and in  relation  to a
               matter,  all losses,  costs and damages  (including all penalties
               and fines) which such Person suffers, sustains, pays or incurs in
               connection  with such  matter  and  includes  Taxes  (other  than
               refundable  Taxes),  reasonable costs of legal counsel (on a full
               indemnity  basis) and other  consultants and reasonable  costs of
               investigating and defending Claims arising from such matter,  but
               shall  not  include  loss of  profits,  economic  loss  or  other
               consequential damages suffered by such Person;

         (52)  "March 26, 1999 Indenture" means that Trust Indenture dated March
               26,  1999  among  Abraxas,  as  Issuer,  Canadian  Abraxas  as  a
               Guarantor, and Norwest Bank Minnesota, N.A. as Trustee and others
               as further guarantors  relating to the issuance of US $63,500,000
               in 12 ?% Senior Notes due 2003;

         (53)  "Material" means that a specified fact,  circumstance or event or
               combination  thereof  is  reasonably  expected  to (i)  result in
               Liabilities  or  Losses  to any of the  Companies  of  more  than
               $150,000;  or (ii) affect (either  positively or negatively)  the
               value of the Oil and Gas Assets by more than $150,000;

         (54)  "Material  Adverse  Effect"  means in  relation  to a Party,  any
               change  or effect  that is  reasonably  likely  to be  materially
               adverse  to  the  business,  operation,   properties,   financial
               condition, assets or liabilities of the entity in question, taken
               as a whole and which is  reasonably  expected  to: (i) if Closing
               occurs result in such Party  suffering  Losses of 10% of the Base
               Price or more or (ii) make it illegal or  impossible  to complete
               the  transfer  of the Shares  from the  Seller to the  Purchaser,
               provided  that a Material  Adverse  Effect  shall not  include an
               adverse  effect  resulting  from a change (a) resulting  from any
               decline  in crude oil or  natural  gas  prices  on a  current  or
               forward basis; or (b) resulting from general economic, financial,
               currency  exchange,  securities or commodity market conditions in
               Canada  or  elsewhere;   or  (c)  resulting  from  the  drilling,
               completion   or  testing  after  the  date  hereof  of  any  Well
               establishing  that any such Well or prospect is not  commercially
               viable or is less successful  than  anticipated by the Purchaser;
               or (d)  resulting  from  changes  in the  oil  and  gas  industry
               generally,   including,   for  greater  certainty,   any  adverse
               circumstances  resulting  from the Government of Canada's plan to
               ratify or implement the Kyoto Accord;

         (55)  "Material  Contracts"  means  all  contracts  and  other  written
               agreements  to which the  Companies or any of their  subsidiaries
               are a party, the performance of which will involve  consideration
               in excess of $150,000 per year or $1,500,000 in the aggregate but
               does not include Title and Operating Documents;

         (56)  "Mirant  Credit  Agreement"  means that  Credit  Agreement  dated
               December 20, 2001 between Mirant Canada Energy Capital,  Ltd. and
               Grey Wolf;

         (57)  "Miscellaneous  Interests"  means  all of the  Companies'  right,
               title,  estate and  interest in and to all  property,  assets and
               rights  associated  with the  Petroleum and Natural Gas Rights or
                                       7


               the  Tangibles  (other than the  Petroleum and Natural Gas Rights
               and the Tangibles themselves) including, but not in limitation of
               the  generality  of the  foregoing,  the entire  interest  of the
               Companies in:

               (i)  all  contracts  and  agreements   directly  related  to  the
                    Petroleum   and  Natural   Gas  Rights  or  the   Tangibles,
                    including,  without  limitation,  the  Title  and  Operating
                    Documents;

               (ii) the Surface Rights;

               (iii) all Wells; and

               (iv) the records, data and information related to the Oil and Gas
                    Assets,  including,  without  limitation,  well files, lease
                    files,    agreement   files,   Seismic   Data,   geological,
                    geophysical,  engineering  and production  records,  and all
                    financial  records,  statements,  documents and  information
                    concerning  the  Companies  and  the  minute  books  of  the
                    Companies;

         (58)  "New Title Defects" has the meaning specified in Section 11.2;

         (59)  "Office  Lease" means Grey Wolf's  lease for its Calgary  office,
               which is described in Schedule G;

         (60)  "Oil and Gas Assets"  means the Petroleum and Natural Gas Rights,
               the Companies'  interests in the Tangibles and the  Miscellaneous
               Interests;

         (61)  "Ordinary  Course  of  Business"  means  the  ordinary  course of
               business  consistent  with  prior  custom  and  practice  or with
               industry  practice   (including  with  respect  to  quantity  and
               frequency);

         (62)  "Party"  means the Seller,  Grey Wolf or Canadian  Abraxas or the
               Purchaser and "Parties" means all of them;

         (63)  "Permitted Encumbrances" means:

               (i)  liens for taxes,  assessments or governmental  charges which
                    are not due or  delinquent  or, as set forth in  Schedule  M
                    where  Material,  the validity of which is being  diligently
                    contested  in good faith by the Seller,  the  Companies  (or
                    either of them);

               (ii) liens incurred or created in the ordinary course of business
                    as security in favour of any other Person who is  conducting
                    the  development  or operation of the property to which such
                    liens relate for the Companies' share (or either of them) of
                    the costs and  expenses  of such  development  or  operation
                    which are not due or delinquent;

               (iii)mechanics',  builders' or materialmen's  liens in respect of
                    services rendered or goods supplied for which payment is not
                    due;

               (iv) easements, rights of way, servitudes or other similar rights
                    in land (including,  without  limitation,  rights of way and
                    servitudes  for  railways;   sewers;  drains;  gas  and  oil
                                       8

                    pipelines;  gas and water mains; and electric light,  power,
                    telephone,  telegraph and cable television conduits,  poles,
                    wires and cables);

               (v)  the  right  reserved  to or vested  in any  municipality  or
                    governmental  or other public  authority by the terms of any
                    lease,  license,  franchise,  grant  or  permit  or  by  any
                    statutory provision,  to terminate any such lease,  license,
                    franchise,  grant or  permit or to  require  annual or other
                    periodic payments as a condition of the continuance thereof;

               (vi) governmental requirements of general application, including,
                    without  limitation,  those  respecting  production rates or
                    other operational matters;

               (vii) the Encumbrances described in Schedule E;

               (viii) the reservations,  limitations, provisos and conditions in
                    any  original  grants  from the Crown of any of the Lands or
                    interests therein and statutory exceptions to title;

               (ix) the  terms  and   conditions  of  the  Title  and  Operating
                    Documents; and

               (x)  the  Encumbrances  identified  in  Schedules  I or  M or  in
                    respect  of  the  Excluded  Assets  for  which   discharges,
                    releases or undertakings are delivered at Closing;

         (64)  "Permitted  Transactions"  means  those  transactions  listed  in
               Schedule I;

         (65)  "Person"  means  any  individual,  body  corporate,   partnership
               (limited  or  general),   trust,  trustee,  executor  or  similar
               official, governmental agency or authority or other entity;

         (66)  "Petroleum and Natural Gas Rights" means the entire right, title,
               estate and interest of the Companies in:

               (i)  rights (whether fee simple interests, leasehold interests or
                    other  interests) to drill for and produce,  save and market
                    Petroleum Substances from the Lands;

               (ii) royalties,  net  profits  interests  and  similar  interests
                    entitling  the holder  thereof  to a share of the  Petroleum
                    Substances  produced  from  the  Lands or  lands  pooled  or
                    unitized  therewith or to a payment  calculated by reference
                    to the quantity of such  production,  the proceeds  from the
                    sale thereof or the profits therefrom; and

               (iii) rights to acquire the foregoing;

         (67)  "Petroleum  Substances" means petroleum,  natural gas and related
               hydrocarbons (including crude oil, natural gas liquids,  coal-bed
               methane, but excluding coal) and all other substances  (including
               sulphur and sulphur compounds) produced in association therewith;
                                       9

         (68)  "Place of Closing" means the offices of Osler,  Hoskin & Harcourt
               LLP located at 1900, 333 - 7th Avenue S.W., Calgary, Alberta, T2P
               2Z1;

         (69)  "Pre-Closing Period" means the period from the Adjustment Date to
               the Time of Closing;

         (70)  "Prime Rate" means the rate of interest,  expressed as a rate per
               annum,  announced from time to time by the Canadian Imperial Bank
               of  Commerce  as its  reference  rate  used for  Canadian  dollar
               commercial  loans  made in Canada  and  referred  to by it as its
               "prime rate";

         (71)  "Purchased  Assets" shall have the meaning  specified in Schedule
               Q;

         (72)  "Purchase Price Adjustment Amount" means the amount (which may be
               a negative amount) equal to:

               (i)  the  amount of  unpaid  principal  and  accrued  but  unpaid
                    interest on the Companies' Debt as of the Adjustment Date;

               (ii) plus interest paid or accrued  (without  duplication) on the
                    Companies' Debt during the Pre-Closing Period;

               (iii)plus the amount of the Working Capital  deficiency as of the
                    Adjustment  Date,  if  the  Working  Capital  is a  negative
                    amount,  or minus the Working  Capital as of the  Adjustment
                    Date, if the Working Capital is a positive amount;

               (iv) plus the  costs,  if any,  of  termination  of all  Retained
                    Employees as contemplated by Section 10.2; and

               (v)  plus $3,000,000;

         (73)  "Required  Approvals"  means  all  required  approvals  by  third
               parties of the transactions  contemplated by this Agreement,  and
               the other approvals and  authorizations  of the purchase and sale
               of the Shares pursuant hereto required to be obtained pursuant to
               Applicable Law which,  if not obtained,  would be Material to the
               Seller, the Purchaser, or either of the Companies;

         (74)  "Representatives"  means in relation to a Party,  its  directors,
               officers, servants, agents and employees;

         (75)  "Retained Employees" shall have the meaning ascribed to such term
               in Section 10.1;

         (76)  "Security Interest" means any pledge,  lien, charge,  conditional
               sale, title retention arrangement, mortgage, assignment by way of
               security or other security interest;

         (77)  "Seismic  Data" means seismic data  including  surveyors'  ground
               elevation  records,  shot point maps,  drillers' logs,  shooters'
                                       10

               records, seismograph records, seismograph magnetic tapes, monitor
               records,  field records and record  sections,  including maps and
               interpretations made therefrom;

         (78)  "Seller" means Abraxas;

         (79)  "Shares" means  collectively  the Canadian Abraxas Shares and the
               Grey Wolf Shares owned by Abraxas;

         (80)  "Surface  Rights"  means all rights to enter upon,  use or occupy
               the surface of lands  (including,  but not limited to, the Lands)
               which are used or held for use in  connection  with the Petroleum
               and  Natural  Gas Rights or the  Tangibles,  including  rights to
               enter  upon,  use and  occupy  the  surface of lands on which the
               Tangibles  and the Wells are  located or any lands with which the
               same have been pooled or  unitized  and rights to use the surface
               of lands to gain access thereto;

         (81)  "Take or Pay Obligations"  means obligations of the Companies (or
               either of them) under or in respect of a contract for the sale of
               production  of  Petroleum  Substances  arising  as  a  result  of
               payments made by or on behalf of the buyer  thereunder in advance
               of taking delivery of Petroleum Substances pursuant thereto or in
               lieu of or as compensation for the buyer not taking deliveries of
               Petroleum Substances pursuant thereto;

         (82)  "Tangibles"  means all equipment and facilities  used or held for
               use  in  respect  of  the  production,   gathering,  dehydration,
               processing,   treatment,   measurement,   storage,  injection  or
               transportation  of Petroleum  Substances  from the Lands or lands
               pooled or  unitized  therewith,  including,  without  limitation,
               wellheads,  pumps, pumpjacks,  dehydrators,  separators,  meters,
               generators,   flowlines,   gathering  lines,  batteries,   tanks,
               pipelines,   compressors,   scrubbers,  boilers,   communications
               equipment,  pipeline  connections,   motors  and  gas  processing
               plants;

         (83)  "Tax  Records"  means  all Tax  Returns,  books and  records  and
               correspondence   related  to  tax   matters   relevant   for  the
               determination  of  compliance  with tax laws and  exposure to tax
               liabilities of whatever nature;

         (84)  "Tax  Returns"  includes  all  returns,  reports,   declarations,
               elections,  filings,  information returns and statements required
               to be filed by any Party in respect of Taxes;

         (85)  "Tax"  or  "Taxes"  means  all  taxes,  duties,  fees,  premiums,
               assessments,  levies  and other  charges  of any kind  whatsoever
               imposed by any taxing or other governmental  authority or agency,
               together  with all  interest and  penalties  in respect  thereof,
               excluding  royalties and similar  payments payable pursuant to or
               in respect of the Leases;

         (86)  "Time of Closing"  means 10:00 a.m.  Calgary  time on the Closing
               Date;

         (87)  "Title and  Operating  Documents"  means (i) the Leases  (ii) all
               agreements  relating to the ownership or operation of the Oil and
               Gas  Assets  entered  into  in the  normal  course  of  business,
                                       11

               including,   without  limitation:   operating  procedures;   unit
               agreements  and unit  operating  agreements;  agreements  for the
               construction,  ownership and operation of gas plants,  pipelines,
               gas gathering systems and similar facilities; pooling agreements,
               royalty  agreements,  farmin  agreements,  farmout agreements and
               participation agreements; trust agreements; agreements respecting
               the   gathering,   measurement,    processing,   compression   or
               transportation  of  Petroleum  Substances;   Gas  and  Oil  Sales
               Contracts;  seismic data  licensing  agreements;  well  operating
               contracts;  and  surface  leases,  pipeline  easements,  road use
               agreements  and  other  contracts  granting  the right to use the
               surface of lands;  and (iii) all permits,  licenses and approvals
               issued or granted by governmental  authorities  pertaining to the
               ownership  or  operation  of  the  Oil  and  Gas  Assets  or  the
               gathering,    processing,    treatment,   storage,   measurement,
               transportation or sale of the production of Petroleum  Substances
               from the Oil and Gas Assets;

         (88)  "Title Defects" means:

               (i)  in relation to an Oil and Gas Asset, a defect,  imperfection
                    or  deficiency in the title of the Companies on such Oil and
                    Gas  Asset  which is such  that a  reasonable,  prudent  and
                    otherwise  willing  buyer of such Oil and Gas  Asset for the
                    fair  market  value  thereof  (computed  as if such  defect,
                    imperfection  or  deficiency  did not exist) would refuse to
                    purchase  such Asset or require a reduction  in the purchase
                    price thereof solely because of such defect, imperfection or
                    deficiency; or

               (ii) with respect to an interest  attributed  to a Company in the
                    Schedules,  such Company's  actual  interest being less than
                    that attributed to it in the Schedules;

               but does not include the Permitted  Encumbrances,  title defects,
               deficiencies  or  qualifications  disclosed  or set  forth in the
               Title Opinions;

         (89)  "Title Opinions" means:

               (i)  Title  Opinion of Code Hunter dated July 25, 1991  regarding
                    the  Acquisition of Interest from Novalta  Resources Inc. by
                    CGGS Canadian Gas Gathering Systems Inc.;

               (ii) Title  Opinion  of  Code  Hunter  dated  December  16,  1991
                    regarding Acquisition of Interest from Gulf Canada Resources
                    Limited by CGGS Canadian Gas Gathering Systems Inc.; and

               (iii)Title  Opinion of Bennett  Jones  dated  October 29, 1996 in
                    respect of certain  P&NG Rights  owned by CGGS  Canadian Gas
                    Gathering Systems Inc.;

         (90)  "Wells"   means  all  wells   (including,   without   limitation,
               producing,  shut-in, suspended, capped, abandoned,  injection and
               disposal  wells) located on the Lands or lands pooled or unitized
               therewith, and including those wells set out on Schedule "E";
                                       12

         (91)  "Working  Capital"  means the  following  amount  (which may be a
               negative amount):

               (i)  the sum of the amount of the Companies' current assets, less
                    any unamortized costs relating to the Companies' Debt; minus

               (ii) the sum of the amount of the Companies' current  liabilities
                    (which  current  liabilities  will not  include  future site
                    restoration,  the  Companies'  Debt or any accrued  interest
                    thereon);

                  determined in accordance with GAAP, applied on a basis
                  consistent with the Companies' past practices. Receivables
                  assigned pursuant to Schedule I shall not be included in the
                  Companies' current assets. Payables assigned pursuant to
                  Schedule I, if any, shall not be included in the Companies'
                  current liabilities.

1.2      Headings, meaning of "hereof", and Article and Schedule References

         The headings of Articles,  Sections,  and Subsections in this Agreement
are for  convenience of reference only and shall not affect the  construction or
interpretation  of  this  Agreement.  The  terms  "this  Agreement",   "hereof",
"hereunder"  and similar  expressions  refer to this  Agreement  in its entirety
(including  Schedules)  and include any agreement  supplemental  hereto.  Unless
something in the subject matter or context is inconsistent therewith, references
herein to  Articles,  Sections,  Subsections  and  Paragraphs  are to  Articles,
Sections,  Subsections and Paragraphs of this Agreement and references herein to
Schedules are references to Schedules to this Agreement.

1.3      Single and Plural and Gender

         In this  Agreement  words  importing  the  singular  number  only shall
include the plural and vice versa and words  importing  one gender shall include
the other genders.

1.4      Currency

         Unless specifically otherwise stated, all references to currency herein
are to lawful money of Canada.

1.5      "Including"

         In this Agreement,  "including" means "including,  without limiting the
generality of the foregoing".

1.6      Knowledge

         In  this  Agreement,  unless  otherwise  indicated,  references  to the
Seller's knowledge, information, belief or awareness and similar references mean
the actual  knowledge  of the officers of the Seller and the  Companies  after a
reasonable  inquiry  of its  current  employees  whose  day  to  day  employment
responsibilities  relate to the matter in  question,  but does not  include  the
knowledge of any other Person nor  constructive or deemed  knowledge.  Except as
stated  above,  a Party  shall have no  obligation  to make any inquiry of other

                                       13


Persons  or  other  Persons'  files  and  records  or of any  public  office  in
connection  with  representations  which  are  made  herein  in  respect  of its
knowledge, information, belief or awareness.

1.7      Schedules

         The following are the Schedules to this Agreement:

         Schedule.                  Title

         Schedule A         -       Financial Statements
                                                     a)       Grey Wolf
                                                              1) Dec 31/01
                                                              audited 2) Sept
                                                              30/02 unaudited
                                                     b)       Canadian Abraxas
                                                              1) Dec 31/01
                                                              audited 2) Sept
                                                              30/02 unaudited

     Schedule B    -   Form of Officer's Closing Certificate
     Schedule C    -   Claims
     Schedule D    -   Oil and Gas Sales, and Processing Contracts,
                        Gas Transportation Contracts and Hedging Contracts
     Schedule E    -   Lands, Wells of the Companies
     Schedule F    -   Employee Plans
     Schedule G    -   Description of the Office Lease
     Schedule H    -   Insurance
     Schedule I    -   Certain Permitted Transactions
     Schedule J    -   Bank Accounts
     Schedule K    -   Production Penalties
     Schedule L    -   List of Employees
     Schedule M    -   Disclosures
     Schedule N    -   Facilities
     Schedule O    -   Excluded Assets
     Schedule P    -   Farmout Agreements (Caroline and Pouce Coupe)
     Schedule Q    -   Asset Sale Provisions
     Schedule R    -   Form of Resignation and Release by Directors and Officers
     Schedule S    -   Authorizations for Expenditure
     Schedule T    -   Special Adjustments
     Schedule U    -   Farmor Guarantee

The Schedules are contained in binders  labelled  "Schedules to the Purchase and
Sale  Agreement  dated  November  21, 2002 among  Abraxas et al and  PrimeWest -
Schedules".  The label on the Binders have been  initialled by the Parties.  The
Schedules form part of this Agreement.

1.8      Conflicts

         Where any provision of any Schedule to this  Agreement  conflicts or is
at variance with any provision in the body of this  Agreement,  the latter shall
prevail.

                                       14


1.9      Statute References

         A reference in this  Agreement to a statute shall be a reference to the
statute and the regulations made pursuant thereto as amended or superseded, from
time to time, either before or after the date hereof, unless otherwise stated or
the context otherwise requires.

ARTICLE 2
                                PURCHASE AND SALE

2.1      Purchase and Sale

         The  Seller  hereby  agrees  to sell the  Shares  to the  Purchaser  in
accordance with and subject to the terms and conditions of this  Agreement.  The
Purchaser  hereby  agrees to purchase  such Shares from the Seller in accordance
with and subject to the terms and conditions of this Agreement. Ownership of the
Shares will pass to the Purchaser on Closing.

2.2      Purchase Price

         As  consideration  for the sale of the  Shares by the  Seller  pursuant
hereto,  at Closing and in immediately  available funds, the Purchaser agrees to
pay to the Seller the Base Price plus Interim  Interest less the Purchase  Price
Adjustment  Amount (the  "Adjusted  Purchase  Price").  The Seller shall provide
notice to the Purchaser of its allocation of the Base Purchase Price between the
Shares on or prior to Closing,  which,  upon the consent of the Purchaser,  such
consent not to be unreasonably withheld, shall be the agreed upon allocation.

         The Adjusted Purchase Price shall be allocated based on the appropriate
allocation  of the  Purchase  Price  Adjustment  Amount  between  the Shares and
applied to the Base Price, as allocated in this Section.

2.3      Deposit

         (1)   At the time of  execution  and  delivery of this  Agreement,  the
               Purchaser  shall pay Ten Million  Eight  Hundred  Fifty  Thousand
               Dollars  ($10,850,000)  (herein  called the  "Deposit") to Osler,
               Hoskin & Harcourt LLP,  Barristers  and  Solicitors  (the "Escrow
               Agent"),  to be held by the Escrow  Agent in an  interest-bearing
               solicitor's  trust account to be applied in  accordance  with the
               following terms:

               (i)  if Closing  occurs,  the Deposit  together with the interest
                    actually  earned thereon while held by the Escrow Agent (the
                    "Deposit Interest") shall be paid by the Escrow Agent to the
                    Seller at the Time of Closing,  in partial  satisfaction  of
                    the  Purchaser's  obligation  to pay the  Adjusted  Purchase
                    Price;

               (ii) if Closing does not occur due to a breach of this  Agreement
                    by the  Purchaser,  the  Seller  shall  be  entitled  to the
                    Deposit  and the  Deposit  Interest  which the Escrow  Agent
                    shall pay to the Seller on the scheduled  Closing Date.  The
                    Deposit  and  the  Deposit   Interest  shall   thereupon  be
                    forfeited  to the Seller on account of the damages  suffered
                    by  the  Seller  as  a   consequence   of  such   breach  or
                    termination.  The Parties agree that such amount constitutes

                                       15


                    their  genuine  pre-estimate  of the  damages  which will be
                    suffered   by  the  Seller  by  virtue  of  such  breach  or
                    termination; and

               (iii)if  Closing  does not occur for any  reason or  circumstance
                    other  than that  described  in  Paragraph  2.3(1)(ii),  the
                    Purchaser  shall be  entitled  to the  Deposit  and  Deposit
                    Interest  which the Escrow Agent shall pay to the  Purchaser
                    on the scheduled Closing Date.

               The Purchaser acknowledges that Osler, Hoskin & Harcourt LLP acts
               as legal counsel to the Seller in connection with this Agreement.
               The Purchaser agrees that  notwithstanding  that Osler,  Hoskin &
               Harcourt LLP is the Escrow  Agent,  Osler,  Hoskin & Harcourt LLP
               shall be  entitled  to continue to act on behalf of the Seller in
               respect of any  matter  arising in  relation  to this  Agreement,
               including any dispute regarding the disposition of the Deposit or
               Deposit Interest.

         (2)   If the Escrow  Agent is notified by either  Party,  or  otherwise
               becomes  aware  that  there  is a  dispute  between  the  Parties
               regarding  entitlement  to all or part of the Deposit and Deposit
               Interest,   the  Escrow  Agent  may,  in  its  sole   discretion,
               interplead  the matter and  thereupon pay the Deposit and Deposit
               Interest (or that portion  thereof as to which there is a dispute
               as to entitlement)  into the court of law in which the matter has
               been interpleaded.

2.4      Payment

         (1)   At the  Closing,  subject to Section 4.1, the Deposit and Deposit
               Interest  shall  be paid to the  Seller  by the  Escrow  Agent in
               accordance  with Section 2.3 and the  Purchaser  shall pay to the
               Seller the Adjusted  Purchase  Price (based on the Seller's  good
               faith  estimate  of  the  Purchase  Price  Adjustment  Amount  in
               accordance  with  Section  2.5),  less the  Deposit  and  Deposit
               Interest,  by bank draft or certified cheque. The Companies shall
               pay to CIBC World  Markets Inc. and to BMO Nesbitt  Burns Inc. at
               the Closing the amounts referred to in section 3.1(7) hereof, and
               the Purchaser will loan to the Companies any amounts necessary to
               ensure that the Companies fulfil such  obligations.  In addition,
               the  Purchaser  shall  pay to Newco  the sum of  $1,200,000  as a
               partial  payment  towards  the  drilling  costs of the Test  Well
               pursuant to the Farmout Agreement for the Caroline Area.

         (2)   At the  Closing,  the  Purchaser  shall  loan  to Grey  Wolf  the
               aggregate  amount of the unpaid  principal and accrued but unpaid
               interest in respect of the Companies' Debt as of the Closing Date
               that is  represented  by the Mirant Credit  Agreement.  Grey Wolf
               shall direct the  Purchaser to pay the amount of that loan to the
               Seller in exchange for documents which release and discharge Grey
               Wolf from all of its  obligations in respect of the Mirant Credit
               Agreement  and release all of the assets of Grey Wolf from all of
               the  Security  Interests  granted  in  respect  thereof  under or
               pursuant to the Mirant Credit Agreement (other than the royalties
               that  were  granted  in   connection   with  the  Mirant   Credit
               Agreement).

         (3)   After  Closing,  the Parties shall pay  adjustments in respect of
               the Adjusted Purchase Price in accordance with Section 2.5.

                                       16


2.5      Purchase Price Adjustment and Post Closing Adjustments

         (1)   For the purposes of the Closing,  the Purchase  Price  Adjustment
               Amount  shall be  calculated  on the basis of the  Seller's  good
               faith estimate  thereof,  which shall include the assumption that
               the Working  Capital is as reflected in the  unaudited  September
               30, 2002  Financial  Statements of the Companies  prepared by the
               Companies,  subject to the  adjustments  specified in Schedule T.
               The Seller shall prepare and deliver to the Purchaser a statement
               setting  forth,  in reasonable  detail,  such  calculation of the
               Purchase Price  Adjustment  Amount and any other amount for which
               adjustment is provided herein and the total amount payable by the
               Purchaser at Closing not later than five (5) Business  Days prior
               to  Closing  for the  Purchaser's  review  and shall  assist  the
               Purchaser in verifying the amounts set forth in such statement.

         (2)   The Purchaser  will cause the Auditors to audit the amount of the
               Working  Capital as at the  Adjustment  Date and will make a good
               faith  recalculation  of the Purchase  Price  Adjustment  Amount,
               subject to the  adjustments  specified  in  Schedule I, using the
               amount of Working Capital,  and any other amounts that affect the
               Purchase  Price  Adjustment  Amount  established by the Auditors,
               within one hundred  twenty (120) days following the Closing Date.
               Schedule  T  shall  not  be  considered  by the  Auditors  in the
               calculation  of  the  Working  Capital.  If  the  Purchase  Price
               Adjustment  Amount as  recalculated  by the  Purchaser is not the
               same as the estimate of the Purchase Price Adjustment Amount used
               at Closing, and:

               (i)  is greater  than the  estimate  used at Closing,  the Seller
                    shall pay the overage, together with simple interest thereon
                    at the Prime Rate from the  Adjustment  Date until paid,  to
                    the Purchaser  within 15 days of receipt of  confirmation of
                    the amount of Working  Capital  and any other  amounts  that
                    affect the Purchase Price Adjustment  Amount  established by
                    the Auditors; or

               (ii) is less than the  estimate  used at Closing,  the  Purchaser
                    shall  pay the  shortfall,  together  with  simple  interest
                    thereon  at the Prime  Rate from the  Adjustment  Date until
                    paid,   to  the   Seller   within  15  days  of  receipt  of
                    confirmation  of the amount of Working Capital and any other
                    amounts that affect the  Purchase  Price  Adjustment  Amount
                    established by the Auditors.

ARTICLE 3
                    REPRESENTATIONS, WARRANTIES AND COVENANTS

3.1      Regarding the Seller and the Shares:

         The  Seller  represents  and  warrants  to  Purchaser  that  except  as
disclosed on Schedules I or M:

         (1)   Incorporation: The Seller is duly incorporated,  validly existing
               and in good standing under the laws of the State of Nevada. It is
               duly authorized to conduct business and is in good standing under

                                       17


               the  laws  of  each  jurisdiction  where  such  qualification  is
               required.  It has all requisite  corporate power and authority to
               own,  operate  and  lease  its  properties  and to  carry  on its
               business as presently  conducted.  Neither Grey Wolf nor Canadian
               Abraxas   is  subject   to,  or   affected   by,  any   unanimous
               shareholders' agreement;

         (2)   Authority,  Approval  and  Enforceability:  The  Seller  has  all
               requisite  power and  corporate  authority to execute and deliver
               this  Agreement  and  to  perform  its  obligations   under  this
               Agreement.  The execution and delivery of this  Agreement and the
               performance of the  transactions  contemplated  hereby by it have
               been approved by all necessary  action.  This  Agreement has been
               duly   executed  and  delivered  on  behalf  of  the  Seller  and
               constitutes  the  legal,  valid  and  binding  obligation  of the
               Seller,  enforceable  against the Seller in  accordance  with its
               terms,  subject to  applicable  bankruptcy,  insolvency  or other
               similar  laws  relating  to  or  affecting  the   enforcement  of
               creditor's  rights generally and to general  principles of equity
               ("Creditors'  Rights").  At the  Closing all  documents  required
               hereunder  to be executed  and  delivered by the Seller will have
               been duly  authorized,  executed and  delivered by the Seller and
               will  constitute  legal,  valid and  binding  obligations  of the
               Seller,  enforceable in accordance  with their terms,  subject to
               Creditors'  Rights.  Neither  the  Seller nor the  Companies  are
               required to give any notice to, make any filing  with,  or obtain
               any  authorization,  consent,  or approval of any  government  or
               governmental  agency  in order  to  consummate  the  transactions
               contemplated by this Agreement,  except for the filings  required
               in  the  Competition   Act  and  except  for  notices,   filings,
               authorizations,  consents or  approvals  which (i) if not made or
               obtained,  would not  adversely  affect the  Seller's  ability to
               consummate the transactions contemplated by this Agreement on the
               terms set  forth  herein,  or (ii)  which  have  been  previously
               obtained and are  currently in force.  The Seller is not party to
               any voting trust,  proxy or other agreement or understanding with
               respect to the voting of the Shares;

         (3)   Title to the Grey Wolf  Shares:  Each party  listed  below is the
               registered and beneficial owner of the number of Grey Wolf Shares
               listed  opposite  its name below and now has,  and at the Time of
               Closing will have,  good and  marketable  title to such Grey Wolf
               Shares,  free  and  clear  of all  Encumbrances  and  there is no
               contract,  option or any other right  binding upon such Person or
               which at any time in the  future  may  become  binding  upon such
               Person to sell, transfer,  assign, pledge, charge, mortgage or in
               any other way dispose of or encumber  any of the Grey Wolf Shares
               owned by it other than pursuant to this Agreement:

                  Abraxas                      12,459,349 Grey Wolf Shares
                  Canadian Abraxas                345,279 Grey Wolf Shares

         (4)   Title  to  the  Canadian  Abraxas  Shares:   The  Seller  is  the
               registered  and  beneficial  owner  of  all  of  the  issued  and
               outstanding  Canadian Abraxas Shares and now has, and at the time
               of Closing will have, good and marketable  title to such Canadian
               Abraxas Shares,  free and clear of all  Encumbrances and there is
               no  contract,  option or other right  binding  upon the Seller or
               which at any  time in the  future  may  become  binding  upon the
               Seller to sell, transfer,  assign, pledge, charge, mortgage or in

                                       18


               any other way dispose of or encumber any of the Canadian  Abraxas
               Shares owned by it other than pursuant to this Agreement;

         (5)   No Defaults or Consents:  Neither the  execution  and delivery of
               this   Agreement   nor  the   completion   of  the   transactions
               contemplated hereby will:

               (i)  violate or result in a breach or  default  of,  require  any
                    consent under, be in conflict with, accelerate or permit the
                    acceleration  of the  performance  of, result in the loss or
                    termination  of or give a third  party a right to  terminate
                    any material agreement,  license, permit, franchise or other
                    instrument  to which the Seller is a party or by which it is
                    bound or which relate to any of the Shares;

               (ii) violate or conflict with any Applicable Law;

               (iii)give  rise  to  any   rights  of  first   refusal  or  other
                    pre-emptive,  preferential or similar rights to purchase any
                    of the Shares;

               (iv) create  or  allow  the  creation  of an  Encumbrance  on the
                    Shares; or

               (v)  violate or conflict with the Seller's  constating  documents
                    or bylaws;

         (6)   No Claims  Affecting  the Sale of the Shares:  the Seller has not
               received  notice of any Claim and the  Seller is not aware of any
               Claim,  actual or threatened,  which prevents or could reasonably
               be  expected  to prevent  the  consummation  of the  transactions
               contemplated by this Agreement;

         (7)   No  Finder's  Fees:  neither  the Seller nor the  Companies  have
               incurred any  obligation or  liability,  contingent or otherwise,
               for  broker's  or  finder's  fees in respect of the  transactions
               contemplated hereby for which the Purchaser,  or the Companies or
               any of their respective subsidiaries shall have any obligation or
               liability  (other than to CIBC World Markets Inc. and BMO Nesbitt
               Burns Inc. pursuant to letter agreements dated June 18, 2002, all
               of  the  liabilities  under  which  letter  agreements  shall  be
               adjusted by including the aggregate amount of such Liabilities in
               Working Capital as a current liability of the Companies as of the
               Adjustment Date); and

         (8)   Residency: The Seller is not a resident of Canada for the purpose
               of the Canadian Tax Act.


3.2      Regarding Grey Wolf

         The Seller  represents  and  warrants to the  Purchaser  that except as
disclosed on Schedules I or M and except as it relates to the Excluded Assets:

         (1)   Incorporation:  Grey  Wolf is a body  corporate  organized,  duly
               formed and subsisting  under the laws of the Province of Alberta.
               It is duly authorized to conduct business and is in good standing
               under the laws of each jurisdiction  where such  qualification is
               required.  Grey  Wolf  has  all  requisite  corporate  power  and

                                       19


               authority to own,  operate and lease its  properties and to carry
               on its business as presently conducted.  Grey Wolf is not subject
               to, or affected by, any unanimous shareholders' agreement;

         (2)   Authority,  Approval  and  Enforceability:   Grey  Wolf  has  all
               requisite  power and  corporate  authority to execute and deliver
               this  Agreement  and  to  perform  its  obligations   under  this
               Agreement.  The execution and delivery of this  Agreement and the
               performance of the  transactions  contemplated  hereby by it have
               been approved by all necessary  action.  This  Agreement has been
               duly   executed  and   delivered  on  behalf  of  Grey  Wolf  and
               constitutes the legal, valid and binding obligation of Grey Wolf,
               enforceable  against  Grey  Wolf in  accordance  with its  terms,
               subject  to  Creditors'  Rights.  At the  Closing  all  documents
               required hereunder to be executed and delivered by Grey Wolf will
               have been duly  authorized,  executed and  delivered by Grey Wolf
               and will constitute legal, valid and binding  obligations of Grey
               Wolf,  enforceable  in  accordance  with their terms,  subject to
               Creditors'  Rights.  Grey Wolf is not required to give any notice
               to, make any filing with, or obtain any  authorization,  consent,
               or approval of any government or governmental  agency in order to
               consummate  the  transactions  contemplated  by  this  Agreement,
               except for the filings required in the Competition Act and except
               for notices, filings, authorizations, consents or approvals which
               (i) if not made or  obtained,  would not  adversely  affect  Grey
               Wolf's ability to consummate  the  transactions  contemplated  by
               this  Agreement  on the terms set forth  herein,  (ii) which have
               been previously obtained and are currently in force;

         (3)   No Defaults or Consents:  Neither the  execution  and delivery of
               this   Agreement   nor  the   completion   of  the   transactions
               contemplated hereby will:

               (i)  violate or result in a breach or  default  of,  require  any
                    consent under, be in conflict with, accelerate or permit the
                    acceleration  of the  performance  of, result in the loss or
                    termination  of or give a third  party a right to  terminate
                    any material agreement,  license, permit, franchise or other
                    instrument  to which  Grey Wolf is a party or by which it is
                    bound or which relate to or bind any of its assets;

               (ii) violate or conflict with any Applicable Law;

               (iii)create  or  allow  the  creation  of an  Encumbrance  on its
                    assets; or

               (iv) violate or conflict with Grey Wolf's constating documents or
                    bylaws;

         (4)   Capitalization of Grey Wolf: The authorized  capital of Grey Wolf
               consists  of an  unlimited  number of common  shares  without par
               value  of  which   12,804,628   common   shares  are  issued  and
               outstanding. The Seller is the registered holder of 12,459,349 of
               such  shares and  Canadian  Abraxas is the  registered  holder of
               345,279 shares.  All of the shares are duly  authorized,  validly
               issued,  fully paid and non-assessable.  There are no outstanding
               subscriptions,  options, convertible securities,  warrants, calls
               or other  securities  granting  rights to purchase  or  otherwise
               acquire  any  securities  of  Grey  Wolf  or any  commitments  or
               agreements  of any  character  obligating  Grey Wolf to issue any
               such  securities.  There are no outstanding  or authorized  stock

                                       20


               appreciation,  phantom  stock,  profit  participation  or similar
               rights with respect to Grey Wolf;

         (5)   Records:  Complete  and  accurate  originals  or  copies  of  the
               certificate  of  incorporation,  bylaws  and  all  minute  books,
               including all minutes, consents and other records of action taken
               by stockholders and directors  (including any committees thereof)
               of Grey  Wolf and  stock  records  of Grey  Wolf  have  been made
               available  to the  Purchaser  for its  inspection  and have  been
               maintained in accordance with good business practices;

         (6)   Businesses:  The only  business  that  has  been or is  currently
               conducted by Grey Wolf is the  upstream  oil and gas  exploration
               and  production  business  in  Alberta,  Saskatchewan,  Manitoba,
               British  Columbia and Northwest  Territories.  To the best of the
               Seller's knowledge, since the date of the Financial Statements to
               the date of this Agreement,  there has not been: (i) any Material
               change in the financial  condition or business of Grey Wolf other
               than  changes in the  Ordinary  Course of  Business;  or (ii) any
               damage, destruction or loss, whether or not covered by insurance,
               Materially adversely affecting the properties or business of Grey
               Wolf;

         (7)   Conduct of Business:  Since the Adjustment  Date, the business of
               Grey Wolf has been carried on in the Ordinary Course of Business,
               except  Permitted  Transactions  and as  permitted by Section 5.1
               herein;

         (8)   Financial  Statements:  The  Financial  Statements  (i) have been
               prepared in accordance  with GAAP applied on a consistent  basis,
               and (ii) fairly and accurately  disclose in all Material respects
               (determined  in accordance  with GAAP) the financial  position of
               Grey Wolf at  December  31, 2001 and  September  30, 2002 and the
               results of  operations  for the period ended on those dates,  and
               since  September  30,  2002,  there  have been no  changes in the
               business,  assets,  operations,  working  capital,  or  financial
               condition of Grey Wolf,  which have been or could  reasonably  be
               expected  to be  Material,  provided  that no  representation  or
               warranty  is given with  respect to changes  which are  generally
               applicable  to the  oil  and  gas  industry,  including,  without
               limitation,  depletion of reserves as a result of  production  of
               Petroleum   Substances,   the  prices   payable   for   Petroleum
               Substances,  taxation  or  government  regulation.  All  accounts
               receivable reflected in the Financial Statements were and remain,
               if  still  outstanding,  bona  fide  and  were  collected  or are
               collectible (subject to provisions therein for doubtful accounts)
               by Grey Wolf without setoff or counterclaim;

         (9)   Debt: As at the date of the Financial  Statements,  Grey Wolf did
               not have any debt or liabilities of any kind whatsoever  (whether
               accrued,  contingent,  absolute or otherwise) including,  without
               limitation,  liabilities  for Taxes and  pursuant  to any capital
               lease,   except  the  Companies'  Debt  and  any  other  debt  or
               liabilities  included in current liabilities as set forth in such
               Financial Statements;

         (10)  Dividends:  Since September 30, 2002, Grey Wolf has not, directly
               or  indirectly,  declared or paid any  dividends,  or declared or
               made  any  other  distribution  of its  securities,  and has not,
               directly or indirectly, redeemed, purchased or otherwise acquired

                                       21


               any of its  shares,  or agreed to do so, or  reduced  its  stated
               capital  in any  manner  or  purchased,  acquired,  cancelled  or
               redeemed, or agreed to purchase,  acquire,  cancel or redeem, any
               outstanding shares;

         (11)  Subsidiaries: Grey Wolf does not have any subsidiaries;

         (12)  Investments:  Except as  disclosed in the  Financial  Statements,
               Grey  Wolf is not a party  to any  agreements  of any  nature  to
               acquire any shares of any  corporation or to acquire,  capitalize
               or invest in any business;

         (13)  Taxes:  Grey  Wolf  has  duly  and  timely  (i)  filed  with  the
               appropriate  governmental  authority  or  agency  in  the  manner
               prescribed by Applicable Law all Tax Returns required to be filed
               by it and such Tax Returns are true, complete and accurate in all
               Material  respects;  (ii) paid all Taxes (including  instalments)
               due  and  payable  by it  and  made  adequate  provision  in  the
               Financial  Statements  and  accounts  of Grey  Wolf for all Taxes
               payable for the periods  reflected  therein for which Tax Returns
               are not yet required to be filed;  (iii) withheld and remitted to
               the appropriate  governmental authorities all amounts required to
               be  withheld by it in respect of the Tax  liability  of any other
               Person;  and (iv) withheld from any amount paid to or credited by
               it to or for the account or benefit of any Person,  including any
               of its officers and directors and any  non-resident  Person,  the
               amount  of  all  Taxes  and  other  deductions  required  by  any
               Applicable  Law to be withheld  from any such amount and has duly
               and timely remitted the same to the  appropriate  taxing or other
               governmental  authority  or  agency.  Notices  of  assessment  of
               Canadian  federal and provincial  income tax  liabilities of Grey
               Wolf have been issued for all  taxation  years ending on or prior
               to December  31,  2001,  and Grey Wolf is current with respect to
               its  filing  of  returns  for goods and  services  taxes  payable
               pursuant  to the  Excise Tax Act  (Canada).  There are no claims,
               actions,  suits,  audits,  proceedings,  investigations  or other
               actions pending or, to the knowledge of the Seller, threatened in
               respect of Taxes;

         (14)  Agreements with Tax Authorities:  Grey Wolf is not a Party to any
               current   agreement  or  other   arrangement  with  any  taxation
               authority  and there are no waivers or  objections  extending the
               statutory  period  or  providing  for an  extension  of time with
               respect to the  assessment  or  reassessment  or payment of Taxes
               payable by Grey Wolf or Tax Returns  required to be filed by Grey
               Wolf;

         (15)  Discussions with Tax Authorities: Grey Wolf is not engaged in any
               discussions  or  negotiations  with any taxation  authorities  in
               respect of Grey Wolf's Taxes;

         (16)  Indemnities  and  Guarantees:   Grey  Wolf  has  not  guaranteed,
               endorsed, assumed or indemnified,  contingently or otherwise, the
               obligations or indebtedness of any Person outside of the Ordinary
               Course of Business;

         (17)  Litigation:  Other than as set forth in Schedule C, (i) there are
               no judgments  unsatisfied  against  Grey Wolf or any  injunction,
               order,  decree,  ruling or charge to which Grey Wolf is  subject,
               (ii)  there are no Claims in  existence  to which  Grey Wolf is a
               party or threatened  against Grey Wolf which could  reasonably be
               expected  to be  Material  in  the  aggregate  and  (iii)  to the

                                       22


               knowledge of the Seller,  there is no basis upon which a Material
               Claim could reasonably expected to be made against Grey Wolf;

         (18)  Debt  Forgiveness:  Since  December  31,  2001  Grey Wolf has not
               forgiven  any debt or  otherwise  triggered  or  permitted  to be
               triggered  any  of  the   provisions  of  the  Canadian  Tax  Act
               respecting debt  forgiveness  including,  for greater  certainty,
               Section  79 or  Sections  80 to  80.04 of such  Act,  and has not
               cancelled  or released any debts or claims or waived any right of
               Material value pertaining to the Assets;

         (19)  Tax Year: Grey Wolf's taxation year ends on December 31;

         (20)  Non-arm's  Length  Obligations:  No Affiliate,  director,  former
               director,  officer  or  employee  of Grey Wolf or any  Person not
               dealing at "arm's length" (within the meaning of the Canadian Tax
               Act) with any such  Person is indebted to Grey Wolf and Grey Wolf
               is not indebted to any such Person.  No payments or  transactions
               have been  made or  authorized  since  the date of the  Financial
               Statements, or will be made or authorized between the date hereof
               and the Closing  Date, by Grey Wolf, to the Seller or to officers
               or  directors  of Grey Wolf or to any Person not dealing at arm's
               length,  except in the Ordinary Course of Business and at regular
               contractual rates;

         (21)  Bank Accounts:  Certain bank accounts maintained by Grey Wolf are
               listed in Schedule J;

         (22)  Material  Contracts:   The  Seller  has  made  available  to  the
               Purchaser a correct and complete copy of each  Material  Contract
               (as amended to date) to which Grey Wolf is a party or by which it
               or any of its assets is bound.  Grey Wolf is not in breach of any
               such Material Contracts in any Material respect;

         (23)  Transferability  of Shares:  There are no  restrictions in either
               the constating  documents or the by-laws of Grey Wolf, nor in any
               unanimous  shareholders'  agreement or voting trust  agreement or
               other similar collateral  agreement,  which would arise by reason
               of the  execution of this  Agreement or completion of the sale by
               the Seller to the Purchaser of the Shares, which would affect the
               transferability  of its Shares from the Seller to the  Purchaser,
               other than the consent of the  directors of Grey Wolf,  and which
               will not have been complied with at Closing;

         (24)  Real Property Leases: Grey Wolf is not a party to or bound by any
               real property leases other than the Title and Operating Documents
               and  leases  of  field  operating  offices  entered  into  in the
               Ordinary Course of Business;

         (25)  Legal Compliance:  Grey Wolf is in compliance with all Applicable
               Law,  except  where the failure to comply  would not be Material.
               Grey Wolf has all permits,  licenses,  certificates of authority,
               orders and approvals of, and has made all filings,  applications,
               and regulations with federal,  state, local or foreign government
               or  regulatory  bodies  that are  currently  required in order to
               permit it to carry on its  business as presently  conducted,  the
               absence  of  which   individually   or  in  the  aggregate  would
               reasonably be expected to be Material;



         (26)  Insurance: All contracts of insurance maintained by Grey Wolf are
               listed in  Schedule  H and are in full force and effect as of the
               Closing Date and all premiums  due and owing in  connection  with
               such policies have been paid.  To the Seller's  knowledge,  there
               exists no state or event of default  under any  insurance  policy
               and there has been no  notice  or  advice  of  withdrawal  of any
               policy  or any  notice  of  conditions  for  continuation  of any
               coverage  that has not been  complied  with.  Grey Wolf has given
               notice or has otherwise  presented  every Material claim known to
               Grey Wolf and/or the Seller to be covered by insurance  under its
               insurance policies or contracts in a timely fashion;

         (27)  No  Default  Notices:  Grey  Wolf  has not  received  any  notice
               alleging its default under any Material  Contract,  which default
               has not been rectified as of the date hereof;

         (28)  Employees:

               (i)  except as set forth in  Schedule L, Grey Wolf is not a party
                    to any written employment contracts,  consulting agreements,
                    collective  bargaining  agreements  or employee  association
                    agreements;

               (ii) Grey Wolf has not  conducted and is not now  conducting  any
                    negotiations    with   any   labour   unions   or   employee
                    associations;

               (iii)Grey  Wolf  has  complied  with  all of its  obligations  in
                    respect of employment  insurance  programs,  Canada  Pension
                    Plan payments and Worker's Compensation payments;

               (iv) Schedule L hereto  names all of the  employees of Grey Wolf;
                    and

         (29)  Employee Plans: All Employee Plans are listed in Schedule F and:

               (i)  Grey  Wolf  has paid or  provided  for all  liabilities  for
                    wages,  vacation pay,  salaries,  bonuses,  pensions and all
                    other amounts  payable under the Employee Plans prior to the
                    date hereof;

               (ii) each of the  Employee  Plans  complies  with  and  has  been
                    administered  in  substantial   compliance  with  the  terms
                    thereof and Applicable Law; and

               (iii)have  been,  or  will  by  Closing  be,  terminated  with no
                    further Liability to either of the Companies.

3.3      Regarding Canadian Abraxas

         The Seller represents and warrants to the Purchaser that, except as
disclosed in Schedule I or M and except as it relates to the Excluded Assets:

         (1)   Incorporation:  Canadian Abraxas is a corporation duly formed and
               subsisting under the laws of the Province of Alberta.  It is duly
               authorized to conduct  business and is in good standing under the
               laws of each jurisdiction  where such  qualification is required.
               Canadian  Abraxas has all  corporate  power and authority to own,

                                       24

               operate and lease its  properties and to carry on its business as
               presently  conducted.  Canadian  Abraxas  is not  subject  to, or
               affected by, any unanimous shareholders' agreement;

         (2)   Authority, Approval and Enforceability:  Canadian Abraxas has all
               requisite  power and  corporate  authority to execute and deliver
               this  Agreement  and  to  perform  its  obligations   under  this
               Agreement.  The execution and delivery of this  Agreement and the
               performance of the  transactions  contemplated  hereby by it have
               been approved by all necessary  action.  This  Agreement has been
               duly  executed and  delivered  on behalf of Canadian  Abraxas and
               constitutes the legal,  valid and binding  obligation of Canadian
               Abraxas,  enforceable against Canadian Abraxas in accordance with
               its terms,  subject to  Creditors'  Rights.  At the  Closing  all
               documents  required  hereunder  to be executed  and  delivered by
               Canadian  Abraxas  will have been duly  authorized,  executed and
               delivered by Canadian  Abraxas and will constitute  legal,  valid
               and binding  obligations  of  Canadian  Abraxas,  enforceable  in
               accordance  with  their  terms,  subject  to  Creditors'  Rights.
               Canadian  Abraxas is not required to give any notice to, make any
               filing with, or obtain any authorization, consent, or approval of
               any government or governmental  agency in order to consummate the
               transactions  contemplated  by  this  Agreement,  except  for the
               filings  required in the  Competition Act and except for notices,
               filings,  authorizations,  consents or approvals which (i) if not
               made or obtained,  would not adversely  affect Canadian  Abraxas'
               ability  to  consummate  the  transactions  contemplated  by this
               Agreement on the terms set forth herein,  or (ii) which have been
               previously obtained and are currently in force;

         (3)   No Defaults or Consents:  Neither the  execution  and delivery of
               this   Agreement   nor  the   completion   of  the   transactions
               contemplated hereby will:

               (i)  violate or result in a breach or  default  of,  require  any
                    consent under, be in conflict with, accelerate or permit the
                    acceleration  of the  performance  of, result in the loss or
                    termination  of or give a third  party a right to  terminate
                    any material agreement,  license, permit, franchise or other
                    instrument to which Canadian  Abraxas is a party or by which
                    it is bound or which relate to or bind any of its assets;

               (ii) violate or conflict with any Applicable Law;

               (iii)create  or  allow  the  creation  of an  Encumbrance  on its
                    assets; or

               (iv) violate  or  conflict  with  Canadian  Abraxas'   constating
                    documents or bylaws;

         (4)   Share  Capital:   The  authorized  capital  of  Canadian  Abraxas
               consists  of an  unlimited  number of common  shares  without par
               value of which 5,751  common  shares are issued and  outstanding,
               all of which are  registered in the name of the Seller and all of
               which are fully paid and  non-assessable  and an unlimited number
               of First Preferred Shares, none of which are outstanding.  All of
               the shares are duly  authorized,  validly issued,  fully paid and
               non-assessable. There are no outstanding subscriptions,  options,

                                       25


               convertible  securities,  warrants,  calls  or  other  securities
               granting  rights to purchase or otherwise  acquire any securities
               of  Canadian  Abraxas or any  commitments  or  agreements  of any
               character   obligating   Canadian   Abraxas  to  issue  any  such
               securities.   There  are  no  outstanding  or  authorized   stock
               appreciation,  phantom  stock,  profit  participation  or similar
               rights with respect to Canadian Abraxas;

         (5)   Records:  Complete  and  accurate  originals  or  copies  of  the
               certificate  of  incorporation,  bylaws  and  all  minute  books,
               including all minutes, consents and other records of action taken
               by stockholders and directors  (including any committees thereof)
               of Canadian  Abraxas and stock  records of Canadian  Abraxas have
               been made  available to the Purchaser for its inspection and have
               been maintained in accordance with good business practices;

         (6)   Businesses:  The only  business  that  has  been or is  currently
               conducted  by  Canadian  Abraxas  is the  upstream  oil  and  gas
               exploration  and  production  business in Alberta,  Saskatchewan,
               Manitoba  and  British  Columbia.  To the  best  of the  Seller's
               knowledge,  after due  inquiry,  since the date of the  Financial
               Statements to the date of this Agreement, there has not been: (i)
               any  Material  change in the  financial  condition or business of
               Canadian  Abraxas  other than changes in the  Ordinary  Course of
               Business; or (ii) any damage, destruction or loss, whether or not
               covered  by  insurance,   Materially   adversely   affecting  the
               properties or business of Canadian Abraxas;

         (7)   Conduct of Business:  Since the Adjustment  Date, the business of
               Canadian  Abraxas has been carried on in the  Ordinary  Course of
               Business,  except  Permitted  Transactions  and as  permitted  by
               Section 5.1 herein;

         (8)   Financial  Statements:  The  Financial  Statements  (i) have been
               prepared in accordance  with GAAP applied on a consistent  basis,
               and (ii) fairly and accurately  disclose in all Material respects
               (determined  in accordance  with GAAP) the financial  position of
               Canadian  Abraxas at December 31, 2001 and September 30, 2002 and
               the results of  operations  for the period  ended on those dates,
               and since  September  30,  2002 there have been no changes in the
               business,  assets,  operations,  working  capital,  or  financial
               condition  of  Canadian   Abraxas,   which  have  been  or  could
               reasonably   be  expected  to  be  Material,   provided  that  no
               representation or warranty is given with respect to changes which
               are generally applicable to the oil and gas industry,  including,
               without  limitation,  depletion  of  reserves,  as  a  result  of
               production  of  Petroleum  Substances,  the  prices  payable  for
               Petroleum  Substances,  taxation or  government  regulation.  All
               accounts  receivable  reflected in the Financial  Statements were
               and remain, if still outstanding, bona fide and were collected or
               are  collectible  (subject  to  provision  therein  for  doubtful
               accounts) by Canadian Abraxas without setoff or counterclaim);

         (9)   Debt:  As at the  date  of  the  Financial  Statements,  Canadian
               Abraxas  did  not  have  any  debt  or  liabilities  of any  kind
               whatsoever (whether accrued,  contingent,  absolute or otherwise)
               including, without limitation, liabilities for Taxes and pursuant
               to any capital lease, except the Companies' Debt,  obligations as
               guarantor  under the March 26, 1999  Indenture and any other debt
               or  liabilities  included in current  liabilities as reflected in
               such Financial Statements;

                                       26


         (10)  Dividends:  Since September 30, 2002,  Canadian  Abraxas has not,
               directly  or  indirectly,  declared  or paid  any  dividends,  or
               declared or made any other  distribution of its  securities,  and
               has not, directly or indirectly, redeemed, purchased or otherwise
               acquired  any of its  shares,  or agreed to do so, or reduced its
               stated capital in any manner or purchased, acquired, cancelled or
               redeemed, or agreed to purchase,  acquire,  cancel or redeem, any
               outstanding shares;

         (11)  Subsidiaries:  Canadian  Abraxas  does not have any  subsidiaries
               except Grey Wolf;

         (12)  Investments:  Except as  disclosed in the  Financial  Statements,
               Canadian  Abraxas is not a party to any  agreements of any nature
               to  acquire  any  shares  of  any   corporation  or  to  acquire,
               capitalize or invest in any business;

         (13)  Taxes:  Canadian  Abraxas  has duly and timely (i) filed with the
               appropriate  governmental  authority  or  agency  in  the  manner
               prescribed by Applicable Law all Tax Returns required to be filed
               by it and such Tax Returns are true, complete and accurate in all
               Material respects (ii) paid all Taxes (including instalments) due
               and payable by it and made  adequate  provision in the  Financial
               Statements and accounts of Canadian Abraxas for all Taxes payable
               for the periods  reflected  therein for which Tax Returns are not
               yet  required to be filed;  (iii)  withheld  and  remitted to the
               appropriate  governmental  authorities all amounts required to be
               withheld  by it in  respect  of the Tax  liability  of any  other
               Person;  and (iv) withheld from any amount paid to or credited by
               it to or for the account or benefit of any Person,  including any
               of its officers and directors and any  non-resident  Person,  the
               amount  of  all  Taxes  and  other  deductions  required  by  any
               Applicable  Law to be withheld  from any such amount and has duly
               and timely remitted the same to the  appropriate  taxing or other
               governmental  authority  or  agency.  Notices of  assessment  for
               Canadian  federal  and  provincial   income  tax  liabilities  of
               Canadian  Abraxas have been issued for all taxation  years ending
               on or prior to  December  31, 2001 and (ii)  Canadian  Abraxas is
               current  with  respect  to its  filing of  returns  for goods and
               services  taxes payable  pursuant to the Excise Tax Act (Canada).
               There  are  no  claims,  actions,  suits,  audits,   proceedings,
               investigations  or other actions pending or, the knowledge of the
               Seller,  threatened  in respect of Taxes,  except as disclosed in
               Subsection 3.3(14) and (15) below.

         (14)  Agreements with Tax Authorities:  Canadian Abraxas is not a Party
               to any current  agreement or other  arrangement with any taxation
               authority  and there are no waivers or  objections  extending the
               statutory  period  or  providing  for an  extension  of time with
               respect to the  assessment  or  reassessment  or payment of Taxes
               payable by Canadian  Abraxas or Tax Returns  required to be filed
               by  Canadian  Abraxas  other  than a waiver  for a 1997 tax audit
               respecting ARTC claimed by Canadian Abraxas;

         (15)  Discussions with Tax Authorities: Canadian Abraxas is not engaged
               in any discussions or negotiations with any taxation  authorities
               in respect of  Canadian  Abraxas'  Taxes  other than a tax appeal
               with the CCRA with respect to New Cache  Petroleums  Ltd. for the
               tax years 1996 and 1997;

                                       27


         (16)  Indemnities and Guarantees:  Canadian Abraxas has not guaranteed,
               endorsed, assumed or indemnified,  contingently or otherwise, the
               obligations or indebtedness of any Person other than as described
               in the Financial Statements and outside of the Ordinary Course of
               Business;

         (17)  Litigation:  Other than as set forth in Schedule C, (i) there are
               no  judgments   unsatisfied   against  Canadian  Abraxas  or  any
               injunction,  order,  decree,  ruling or charge to which  Canadian
               Abraxas  is  subject,  (ii) there are no Claims in  existence  to
               which Canadian Abraxas is a party or threatened  against Canadian
               Abraxas which could  reasonably be expected to be Material in the
               aggregate and (iii) to the  knowledge of the Seller,  there is no
               basis upon which a Material Claim could reasonably expected to be
               made against Canadian Abraxas;

         (18)  Debt  Forgiveness:  Since December 31, 2001 Canadian  Abraxas has
               not forgiven  any debt or otherwise  triggered or permitted to be
               triggered  any  of  the   provisions  of  the  Canadian  Tax  Act
               respecting debt  forgiveness  including,  for greater  certainty,
               Section  79 or  Sections  80 to  80.04 of such  Act,  and has not
               cancelled  or released any debts or claims or waived any right of
               Material value pertaining to the Assets;

         (19)  Tax Year: Canadian Abraxas' taxation year ends on December 31;

         (20)  Non-arm's  Length  Obligations:  No Affiliate,  director,  former
               director,  officer or employee of Canadian  Abraxas or any Person
               not dealing at "arm's length" (within the meaning of the Canadian
               Tax Act) with any such Person is indebted to Canadian Abraxas and
               Canadian Abraxas is not indebted to any such Person.  No payments
               or  transactions  have been made or authorized  since the date of
               the Financial  Statements,  or will be made or authorized between
               the date hereof and the Closing Date, by Canadian  Abraxas to the
               Seller or to officers or directors of Canadian  Abraxas or to any
               Person or  entity  not  dealing  at arm's  length,  except in the
               Ordinary Course of Business and at regular contractual rates;

         (21)  Bank  Accounts:  Certain  bank  accounts  maintained  by Canadian
               Abraxas are listed in Schedule J;

         (22)  Material  Contracts:   The  Seller  has  made  available  to  the
               Purchaser a correct and complete copy of each  Material  Contract
               (as amended to date) to which  Canadian  Abraxas is a party or by
               which it or any of its assets is bound.  Canadian  Abraxas is not
               in breach of any such Material Contracts in any Material respect;

         (23)  Transferability  of Shares:  There are no  restrictions in either
               the constating  documents or the by-laws of Canadian Abraxas, nor
               in  any  unanimous   shareholders'   agreement  or  voting  trust
               agreement  or other  similar  collateral  agreement,  which would
               arise by reason of the execution of this  Agreement or completion
               of the sale by the Seller to the  Purchaser of the Shares,  which
               would affect the transferability of its Shares from the Seller to
               the  Purchaser,  other  than  the  consent  of the  directors  of
               Canadian  Abraxas,  and which will not have been complied with at
               Closing;

                                       28

         (24)  Real Property Leases: Canadian Abraxas is not a party to or bound
               by any real  property  leases other than the Title and  Operating
               Documents,  and leases of field operating offices entered into in
               the Ordinary Course of Business;

         (25)  Legal  Compliance:  Canadian  Abraxas is in  compliance  with all
               Applicable  Law,  except where the failure to comply would not be
               Material.   Canadian   Abraxas   has   all   permits,   licenses,
               certificates of authority,  orders and approvals of, and has made
               all filings,  applications,  and regulations with federal, state,
               local  or  foreign  government  or  regulatory  bodies  that  are
               currently required in order to permit it to carry on its business
               as presently  conducted,  the absence of which individually or in
               the aggregate would reasonably be expected to be Material;

         (26)  Insurance:  All  contracts  of insurance  maintained  by Canadian
               Abraxas are listed in Schedule H and are in full force and effect
               as of the  Closing  Date  and  all  premiums  due  and  owing  in
               connection  with such  policies  have been paid.  To the Seller's
               knowledge,  there  exists no state or event of default  under any
               insurance  policy  and  there  has been no  notice  or  advice of
               withdrawal  of  any  policy  or  any  notice  of  conditions  for
               continuation  of any coverage  that has not been  complied  with.
               Canadian  Abraxas  has given  notice or has  otherwise  presented
               every Material claim known to Canadian  Abraxas and/or the Seller
               to be  covered  by  insurance  under its  insurance  policies  or
               contracts in a timely fashion;

         (27)  No Default Notices:  Canadian Abraxas has not received any notice
               alleging its default under any Material  Contract,  which default
               has not been rectified as of the date hereof;

         (28)  Employees:

               (i)  Canadian  Abraxas is not a party to any  written  employment
                    contracts,  consulting  agreements,   collective  bargaining
                    agreements or employee association agreements;

               (ii) Canadian Abraxas has not conducted and is not now conducting
                    any   negotiations   with  any  labour  unions  or  employee
                    associations;

               (iii)Canadian  Abraxas has complied  with all of its  obligations
                    in respect of employment insurance programs,  Canada Pension
                    Plan payments and Worker's Compensation payments;

               (iv) Canadian Abraxas has no employees; and

               (v)  Canadian  Abraxas  is not party to or bound by any  Employee
                    Plans.

3.4      Regarding the Assets

         The Seller, except as disclosed in Schedule I or M, represents and
warrants to the Purchaser that, except for the Excluded Assets:

         (1)   Title:  The  Oil  and  Gas  Assets  are  free  and  clear  of all
               Encumbrances  created by,  through or under the Companies (or the
               Seller), other than Permitted Encumbrances, provided that, except

                                       29

               as expressly  set forth in this  subsection,  the Seller does not
               make  any   representation   or  warranty  with  respect  to  the
               Companies' title to any of the Assets;

         (2)   Good Standing Under Agreement: To the Seller's knowledge, neither
               of the  Companies is in Material  breach of any term or provision
               of any Title and Operating Document;

         (3)   Quiet Enjoyment: Subject to the rents, covenants,  conditions and
               stipulations  in the  Leases  required  and on  the  lessee's  or
               holder's part  thereunder to be paid,  performed and observed and
               the Permitted  Encumbrances,  the Companies (or, in the case of a
               sale of the  Oil and Gas  Assets,  pursuant  to  Section  6.4 and
               Schedule Q, the Purchaser)  will be entitled to enjoy the Oil and
               Gas Assets after Closing for the  Companies' or the  Purchaser's,
               as applicable,  own use and benefit without interruption of or by
               the Seller or any Person whomsoever claiming or to claim the same
               or any part thereof or any interest  therein by, through or under
               the Seller or the Companies  for the residue of their  respective
               terms and all renewals or extensions thereof;

         (4)   Reduction  of  Interest:  Except as set forth in  Schedule  E and
               except for Permitted Encumbrances, the Oil and Gas Assets are not
               subject to reduction or retention by rights of conversion, rights
               to purchase,  farmin rights (other than between the Companies) or
               any other  rights  held by the Seller or any other  Person  which
               were created by, through or under the Seller or the Companies;

         (5)   Take or Pay and Gas Balancing: The Companies do not have any Take
               or Pay  Obligations  and are not a party  to or  bound by any gas
               balancing agreements;

         (6)   Environmental  and  Reclamation  Liabilities:  The Seller and the
               Companies  have  given  the  Purchaser   access  to  all  written
               information  in the  possession  or  control of the Seller or the
               Companies  relating to  Environmental  Liabilities and except for
               the Accepted Environmental and Reclamation Liabilities:

               (i)  the Companies  have not received  notice of any Claim by any
                    Person of any Environmental and Reclamation Liabilities;

               (ii) there are no threatened or pending  Claims of  Environmental
                    and Reclamation Liabilities; and

               (iii)all  known  spills or  similar  incidents  pertaining  to or
                    affecting the assets have been  reported to the  appropriate
                    governmental  entity to the extent required by Environmental
                    Laws;

               which in the  aggregate  are or could  reasonably  be expected to
               exceed $1,000,000;

         (7)   Gas and Oil Sales and Processing Contracts:  A description of all
               contracts  which  provide for the sale,  gathering,  compression,
               processing, treatment or storage of Petroleum Substances to which
               the  Companies  are parties or by which the  Companies are bound,
               and which have a term of more than ninety (90) days and which are

                                       30


               not terminable  without  penalty on notice of ninety (90) days or
               less is set forth in  Schedule  D and the  Seller is not aware of
               any third  parties being in breach of such  contracts  where such
               breach would affect the interests of the Companies;

         (8)   Deliveries  of Natural Gas: The  Companies  have not  delivered a
               quantity of natural gas  pursuant to a gas  purchase  contract in
               excess of the  quantity  which  they  were  entitled  to  deliver
               pursuant thereto, except to an extent which is not Material;

         (9)   Royalty  Payments:  All  royalties  payable by the  Companies  in
               respect of the production of Petroleum Substances have been fully
               paid in a timely manner;

         (10)  Hedging  Contracts:  The  Companies are not party to, and neither
               the Companies nor any of their respective  assets are bound by or
               subject to, any  interest  rate swaps,  foreign  exchange  swaps,
               commodity   price   hedging   contracts  or  similar   derivative
               contracts;

         (11)  Intellectual  Property:  The Companies have not interfered  with,
               infringed upon,  misappropriated  or otherwise come into conflict
               with any  patent,  copyright,  trademark,  trade  secret or other
               intellectual  property rights of any Person and have not received
               notice of any Claim of any Person  that they have done so,  other
               than any such  interference,  infringement,  misappropriation  or
               conflict  of which the  Seller is not aware and which  relates to
               the  operation  of a  property  which  is  not  operated  by  the
               Companies;

         (12)  AFE's:  Schedule S sets forth all outstanding  authorizations for
               expenditure  and other capital calls which have been delivered to
               the  Companies in respect of the Assets and for which payment has
               been  or is  required  to be made at any  time  on or  after  the
               Adjustment Date;

         (13)  Gas  Transportation  Contracts:  A  description  of all contracts
               which provide for the  transportation of natural gas to which the
               Companies are parties or by which the Companies are bound,  which
               have a term of more  than  ninety  (90)  days and  which  are not
               terminable  without penalty on notice of ninety (90) days or less
               is set  forth in  Schedule  D and the  Seller is not aware of any
               third parties being in breach of such contracts where such breach
               would affect the interests of the Companies;

         (14)  Leased Tangibles:  None of the Tangibles which is operated by the
               Companies  and which have a value of more than $250,000 is leased
               and, to the knowledge of the Seller,  none of the other Tangibles
               which has a value of more than $250,000 is leased;

         (15)  Condition of the Tangibles:  With respect to properties  operated
               by the  Companies and to the knowledge of the Seller with respect
               to properties not operated by the Companies,  there is no item of
               the Tangibles which, in accordance with good oilfield  practices,
               should  have been  replaced  or repaired at any time prior to the
               Adjustment  Date, or since the  Adjustment  Date at a cost to the
               Companies  in excess of $100,000  which has not been  replaced or
               repaired;

                                       31

         (16)  Good Oilfield Practices: All operations in respect of the Oil and
               Gas Assets prior to the date hereof for which the Companies  were
               the operator  were  conducted in  accordance  with good  oilfield
               practices in all Material  respects  and, to the knowledge of the
               Seller, all other operations in respect of the Oil and Gas Assets
               prior to the date hereof were  conducted in accordance  with good
               oilfield practices;

         (17)  Production in Kind, Production Revenues:  The Companies have been
               receiving  the  revenues   attributable  to  their  interests  in
               accordance  with  the  ordinary  practice  in  the  oil  and  gas
               industry;  where the  Companies  are taking their  production  of
               Petroleum Substances in kind, such Petroleum Substances are being
               delivered  to the  Companies or for their  account in  accordance
               with the ordinary practice in the oil and gas industry;

         (18)  Regulatory Production Penalties:  Except for production penalties
               of general application, none of the wells included in the Oil and
               Gas Assets operated by the Companies have been  overproduced such
               that they are  subject  to a  production  penalty  which has been
               imposed under  Applicable Law and to the knowledge of the Seller,
               none of the other  wells  included  in the Oil and Gas Assets has
               been overproduced such that it is subject to a production penalty
               which has been imposed under Applicable Law;

         (19)  Licenses:  Except  to  the  extent  which,  in any  case,  is not
               Material,   (i)  all  licenses  and  approvals   required   under
               Applicable Law in respect of the Oil and Gas Assets for which the
               Companies  are the operator  have been issued or obtained and are
               in full  force and  effect  and  there is no breach or  violation
               thereof and,  (ii) to the  knowledge of the Seller,  all licenses
               and approvals  required  under  Applicable  Law in respect of the
               other Oil and Gas Assets have been issued or obtained  and are in
               full  force  and  effect  and  there is no  breach  or  violation
               thereof; and

         (20)  Not  Withheld:  The Seller has not  knowingly  withheld  from the
               Purchaser  any  Material  information,  documents  or  agreements
               relevant to the Assets or the Companies  other than as identified
               to the Purchaser.

3.5      Negation

         The Seller makes no representation or warranty, either expressed or
implied, except as and to the extent set forth in Sections 3.1 through 3.4
inclusive. Except for such representations and warranties, the Seller shall not
be liable (whether in contract, in tort or otherwise) for any representation or
warranty which may have been made in any document or instrument relative hereto,
or otherwise communicated or implied to the Purchaser in any manner including,
without limitation, any information or opinion which may have been provided to
the Purchaser or its employees, agents, legal counsel or other representatives
by the Seller, the Companies or Affiliates of the Seller or their employees,
agents, legal counsel or other representatives or otherwise. Except as set forth
in Sections 3.1 through 3.4 inclusive, the Seller specifically makes no
representation or warranty as to the title to Assets of the Companies, Title
Defects, Environmental and Reclamation Liabilities of the Companies. The
Purchaser confirms that it has only relied on the representations and warranties
contained in Sections 3.1 through 3.4 inclusive and not on any representations
or warranties either outside this Agreement, whether expressed or implied. The
Purchaser acknowledges and confirms that it has performed its own due diligence

                                       32

and, except for reliance on the representations and warranties contained in
Sections 3.1 through 3.4 inclusive, has relied, and will continue to rely, upon
its own engineering and other evaluations and projections as the same relate to
the Companies or the Assets and on its own inspection of all other physical
property and assets which comprise the Assets.

3.6      Purchaser's Representations and Warranties

         The Purchaser represents and warrants to the Seller that:

         (1)   Incorporation:   The   Purchaser  is  a  body   corporate,   duly
               incorporated, organized and subsisting under the laws of Alberta;

         (2)   Corporate  Authority:  The Purchaser has the corporate  power and
               authority  to  enter  into  and  deliver  this  Agreement  and to
               complete the transactions contemplated hereby;

         (3)   Financial  Capability:  The Purchaser has and will at the Time of
               Closing have sufficient cash on hand and financial commitments to
               complete the purchase of the Shares pursuant hereto;

         (4)   No Finder's  Fees:  The Purchaser has not incurred any obligation
               or liability,  contingent or otherwise,  for broker's or finder's
               fees in respect of the transactions contemplated hereby for which
               either  the  Seller  or any  of its  Affiliates  shall  have  any
               obligation or liability;

         (5)   Purchaser  acting as Principal:  The Purchaser is purchasing  the
               Shares pursuant hereto as principal;

         (6)   Due  Execution  and  Enforceability:   This  Agreement  has  been
               executed and delivered by the Purchaser and, if duly executed and
               delivered by the Seller,  constitutes the  Purchaser's  valid and
               binding  obligations  enforceable  in accordance  with its terms,
               subject to bankruptcy,  insolvency,  preference,  reorganization,
               moratorium  and other similar laws  affecting  creditors'  rights
               generally and the  discretion of courts with respect to equitable
               and discretionary remedies and defenses;

         (7)   Due Authorization  and no Violations:  The execution and delivery
               of  this  Agreement  and  the  completion  of  the   transactions
               contemplated  hereby have been duly  authorized  by all necessary
               corporate action on the part of the Purchaser and do not and will
               not violate or conflict with any  Applicable  Law or the articles
               of incorporation,  by-laws or similar constitutional documents of
               the Purchaser; and

         (8)   Investment  Canada Act: The Purchaser is not a  non-Canadian  for
               the purposes of the Investment Canada Act.

3.7      Right to Purchase Mirant GORR

         The Seller covenants and agrees that if it or any Affiliate purchases
all or any part of the interest (the "Acquired Interest") of the "Royalty Owner"
under the First Overriding Royalty Agreement dated as of December 20, 2001

                                       33

between Grey Wolf and Mirant Canada Energy Capital, Ltd. ("Mirant") or under the
Second Overriding Royalty Agreement dated as of December 20, 2001 between Grey
Wolf and Mirant, then the Purchaser or any Affiliate of the Purchaser shall have
the right to purchase from the Seller or its Affiliate, as applicable, the
Acquired Interest for a purchase price equal to the Purchase Price, as that term
is defined below. The Purchaser or its Affiliate may exercise the foregoing
right by notice (the "Notice") to the Seller at any time within six months of
the Purchaser becoming aware of the fact that the Seller or its Affiliate has
acquired the Acquired Interest. The purchase of the Acquired Interest by the
Purchaser or its Affiliate shall occur at the date and time after the notice
date (but within 30 days of such notice) specified by the Purchaser or its
Affiliate in the Notice (for this Section 3.7, the "Effective Date").

         For purposes of this Section 3.7, the "Purchase Price" shall be equal
to the present value of the estimated future net cash flows from the Acquired
Interest, before tax, (as at the Effective Date) from the Proved Reserves and
50% of the Probable Additional Reserves (as those terms are defined in National
Policy 2-B of the Canadian Securities Administrators) associated with the
Royalty Lands (as that term is defined in the First Overriding Royalty Agreement
referred to above), at a discount rate of 10% per annum and employing escalated
prices and costs using the arithmetic average of the then most recent price
forecasts of Gilbert Laustsen Jung Associates Ltd. ("GLJ"), McDaniel &
Associates Consultants Ltd. and Sproule Associates Limited. The Proved Reserves
and the Probable Additional Reserves associated with the Royalty Lands shall be
as assigned by GLJ in a report, to be commissioned and paid for by the
Purchaser, evaluating those reserves and that is to have an effective date which
is the same as the date specified in the Notice.

                                    ARTICLE 4
                                   TAX MATTERS

4.1      Withholding Requirement

         (1)   If at the time of the Closing,  a certificate has not been issued
               by the  Minister of National  Revenue  pursuant to section 116 of
               the Canadian Tax Act in respect of the  disposition by the Seller
               of the Shares to the Purchaser,  or such certificate has not been
               delivered to the  Purchaser,  the Purchaser  shall be entitled to
               withhold from the Seller out of the Adjusted  Purchase Price that
               is  otherwise  payable to the Seller on  Closing  hereunder  (the
               "Seller  Purchase  Amount"),  25% of the Seller Purchase  Amount,
               which amount  shall be paid by the  Purchaser to the Escrow Agent
               to be deposited in an interest-bearing trust account.

         (2)   If at the time of the Closing,  a certificate  has been issued by
               the Minister of National Revenue pursuant to subsection 116(2) of
               the Canadian Tax Act in respect of the  disposition by the Seller
               of the  Shares to the  Purchaser  and such  certificate  had been
               delivered to the  Purchaser,  the Purchaser  shall be entitled to
               withhold from the Seller,  out of the Seller Purchase Amount, 25%
               of the  amount,  if any,  by which  the  Seller  Purchase  Amount
               exceeds  the  amount   specified  in  such   certificate  as  the
               certificate limit, which amount shall be paid by the Purchaser to
               the Escrow  Agent to be deposited  in an  interest-bearing  trust
               account.  (The amount paid to the Escrow Agent pursuant to 4.1(1)
               or (2) shall be referred to as the "Withheld Amount").

                                       34


         (3)   If, prior to the 27th day after the end of the month in which the
               Closing Date occurs:

               (i)  the Seller  delivers to the Purchaser and the Escrow Agent a
                    certificate issued by the Minister of National Revenue under
                    subsection  116(2) of the Canadian Tax Act in respect of the
                    disposition  of the Shares by the  Seller to the  Purchaser,
                    the Escrow Agent shall promptly pay to the Seller the lesser
                    of

                    (A) the Withheld Amount and

                    (B) the Withheld  Amount less 25% of the amount,  if any, by
                        which the  Seller  Purchase  Amount  exceeds  the amount
                        specified in such certificate as the certificate limit,

                    together with any interest  earned on the Withheld Amount to
                    the date of such payment  (less any  applicable  withholding
                    Tax), or

               (ii) the Seller  delivers to the Purchaser and the Escrow Agent a
                    certificate issued by the Minister of National Revenue under
                    subsection  116(4) of the Canadian Tax Act in respect of the
                    disposition  of the Shares by the  Seller to the  Purchaser,
                    the Escrow Agent shall  promptly pay the Withheld  Amount to
                    the Seller,  together with any interest earned thereon (less
                    any applicable withholding Tax).

         (4)   If the Purchaser  has withheld the Withheld  Amount and paid such
               amount to the Escrow Agent and the Seller does not deliver to the
               Purchaser  and the Escrow  Agent  prior to the 27th day after the
               end of the month in which the Closing  Date occurs a  certificate
               issued by the  Minister  of  National  Revenue  under  subsection
               116(2)  or  116(4)  of the  Canadian  Tax Act in  respect  of the
               disposition  of the  Shares by the Seller to the  Purchaser,  the
               Escrow Agent shall remit to the Receiver  General of Canada,  out
               of the  Withheld  Amount,  the  amount  required  to be  remitted
               pursuant to  subsection  116(5) of the  Canadian Tax Act, and the
               amount  so  remitted  shall be  credited  to the  Purchaser  as a
               payment to the Seller on account of the Seller  Purchase  Amount,
               and the  Escrow  Agent  shall  pay to the  Seller  any  remaining
               portion of the Withheld Amount,  together with interest earned on
               the Withheld Amount prior to such remittance (less any applicable
               withholding Tax).

         (5)   With  respect to any payment by the  Purchaser  to be made to the
               Seller  after the Closing  pursuant to Section  2.5(2)(B)  hereof
               (the  "Adjustment  Payment"),  if at the time of that  payment  a
               certificate  has not been  issued  by the  Minister  of  National
               Revenue  pursuant  to  section  116 of the  Canadian  Tax  Act in
               respect  of the  disposition  by the  Seller of the Shares to the
               Purchaser  or such  certificate  has not  been  delivered  to the
               Purchaser,  the Purchaser  shall be entitled to withhold from the
               Seller  out  of the  Adjustment  Payment  25%  of the  Adjustment
               Payment (the "Additional Withheld Amount"), which amount shall be
               paid by the  Purchaser  to the Escrow Agent to be deposited in an
               interest-bearing trust account.
                                       35


                  If at the time of the Adjustment Payment, a certificate has
                  been issued by the Minister of National Revenue pursuant to
                  subsection 116(2) or 116(4) of the Canadian Tax Act in respect
                  of the disposition by the Seller of the Shares to the
                  Purchaser and such certificate has been delivered to the
                  Purchaser, the Purchaser shall be entitled to withhold from
                  the Adjustment Payment any additional amount in respect of the
                  disposition by the Seller of the Shares to the Purchaser which
                  the Purchaser may be required to remit to the Receiver General
                  under subsection 116(5) of the Canadian Tax Act in connection
                  with such payment (the "Additional Withheld Amount") which
                  amount shall be paid by the Purchaser to the Escrow Agent to
                  be deposited in an interest-bearing trust account.

                  The Escrow Agent shall remit to the Receiver General the
                  amount required to be remitted pursuant to subsection 116(5)
                  of the Canadian Tax Act in connection with the Adjustment
                  Payment, and the amount so remitted shall be credited to the
                  Purchaser as a payment to the Seller on account of the
                  Adjustment Payment, on the 27th day after the end of the month
                  in which the Adjustment Payment is paid, and the Escrow Agent
                  shall promptly pay to the Seller any portion of the Additional
                  Withheld Amount which is not required to be remitted pursuant
                  to subsection 116(5) of the Canadian Tax Act, together with
                  interest earned on the Additional Withheld Amount (net of any
                  applicable withholding Tax).

                  Notwithstanding the foregoing, if, at any time prior to the
                  27th day after the end of the month in which the Adjustment
                  Payment is paid, any portion of an Additional Withheld Amount
                  is not required to be remitted to the Receiver General
                  pursuant to subsection 116(5) of the Tax Act, the Escrow Agent
                  shall promptly pay to the Seller at such time the lesser of
                  (y) the Additional Withheld Amount and (z) the amount by which
                  the Additional Withheld Amount exceeds the amount that the
                  Purchaser is required to remit to the Receiver General under
                  subsection 116(5) in connection with the Adjustment Payment,
                  together with any interest earned on the Additional Withheld
                  Amount to the date of such payment (net of any applicable
                  withholding Tax).

4.2      Tax Returns

         (1)   The Purchaser  shall cause the Companies to prepare and file in a
               timely manner (at its cost and in  consultation  with the Seller)
               all Tax  Returns  required to be filed by the  Companies  for any
               period that ends on or before the Closing  Date and for which Tax
               Returns have not been filed as of the Closing Date. The Purchaser
               shall  obtain the consent of Seller to any Tax  Returns  filed in
               respect of any  period  ending on or prior to the  Closing  Date,
               which consent shall be deemed  received unless the Seller advises
               otherwise within 10 Business Days following receipt of the return
               and  request  for  consent.  The Seller and the  Purchaser  shall
               co-operate   fully  with  each  other  and  neither   Party  will
               unreasonably  withhold its consent to a request made by the other
               Party with respect to such Tax Returns.  Such Tax Returns will be
               prepared in accordance with reasonable business practices and the
               Companies'  past  practices.  The Parties  agree that an election
               shall be made by each of the  Companies  in its Tax Return  filed
               for its taxation year ending  immediately  before the acquisition
               of control by the Purchaser not to have subsection  256(9) of the

                                       36


               Canadian Tax Act apply, with the result that the taxation year of
               the Companies shall end immediately before the Closing.

         (2)   Unless  Section 6.4 becomes  effective,  no Tax Returns  shall be
               filed by the Seller between the  Adjustment  Date and the Closing
               Date  except  with the prior  written  consent of the  Purchaser,
               which consent shall not be unreasonably withheld.

4.3      Tax Indemnity

         (1)   After Closing the Seller shall be liable to and indemnify:

               (i)  the  Companies  (which  in this  Section  4.3  includes  the
                    Companies'  successors and assigns) in respect of all Losses
                    which the Companies suffer, sustain, pay or incur respecting
                    the following matters:

                    (A) ARTC claimed by Canadian  Abraxas for 1997,  for which a
                        waiver of the limitation  period was provided to Alberta
                        Tax and  Revenue  Administration,  and  for  any  period
                        thereafter which ended prior to the Adjustment Date;

                    (B) the  assessment by Canada  Customs and Revenue Agency of
                        taxes of New  Cache  Petroleums  Ltd.  for the tax years
                        1996 and 1997; and

                    (C) any Claims  pursuant to that Tax Indemnity dated January
                        17, 1997 among Crown Joule  Exploration  Ltd., New Cache
                        Petroleums Ltd. and Inter West Energy Corporation;

               (ii) the  Purchaser in respect of all Losses which the  Purchaser
                    suffers,  sustains,  pays or incurs in respect of Taxes as a
                    consequence of any of the  representations and warranties in
                    Subsections  3.2(9) (as it relates to Taxes for the  periods
                    ending on or prior to December 31, 2001),  (13),  (14), (15)
                    and (18) and 3.3(9) (as it relates to Taxes for the  periods
                    ending on or prior to December 31, 2001),  (13),  (14), (15)
                    and (18) being untrue; and

               (iii)the  Purchaser  and the  Companies  in respect of all Losses
                    which the  Purchaser  or either  of the  Companies  suffers,
                    sustains,   pays  or  incurs  in   respect  of  Taxes  as  a
                    consequence of the Permitted Transactions.

                  The Purchaser shall give prompt written notice to the Seller
                  whenever it becomes aware that a Claim has been or may be made
                  for which the Seller may be liable pursuant to this Indemnity
                  (the "Tax Indemnity"). Unless the Seller notifies the
                  Purchaser that it elects not to have carriage and control of a
                  Claim the Seller shall, at its own expense and employing
                  counsel of its own choice, have full carriage and control of
                  the contestation of any such Claim, provided that if the Claim
                  does not relate solely to matters to which the Tax Indemnity
                  may apply, the Purchaser shall, at its own expense and
                  employing counsel of its own choice, have full carriage and
                  control of the contestation of the portion of the Claims
                  relating to matters to which the Tax Indemnity does not
                  relate; and further provided that where the Seller has
                  carriage and control of a Claim neither the Purchaser nor the
                  Companies will agree to any compromise or settlement of such

                                       37

                  Claim to which the Tax Indemnity may apply without the consent
                  of the Seller, which will not be unreasonably withheld.
                  Notwithstanding the foregoing, the Seller's right to have
                  carriage and control of the contestation of any such Claim
                  shall only apply and continue to apply after payment of the
                  amount of such Claim or the provision of such security as is
                  necessary to avoid a lien being placed on the property of the
                  Companies (or the Purchaser) in respect of such Claim. Where
                  the Seller has carriage and control of a Claim, if the
                  Purchaser does not consent to a settlement of a Claim to which
                  the Tax Indemnity may apply following a request from the
                  Seller to do so, the obligation of the Seller to indemnify the
                  Purchaser for the Claim shall be limited to the amount that
                  the Seller would have been required to pay to the Companies
                  pursuant hereto in respect of the Claim if the settlement had
                  been accepted and the Seller shall forthwith transfer carriage
                  of the contestation of the Claim to the Purchaser or its
                  nominee. The Purchaser, the Companies and the Seller shall
                  cooperate with each other in any defence of any such Claims
                  and shall keep each other reasonably informed of the conduct
                  thereof. If the Seller elects not to have carriage and control
                  of the contestation of the Claim, the Purchaser and the
                  Companies shall be under no obligation to contest, settle or
                  compromise the Claim and such failure to contest, settle or
                  compromise the Claim shall not prejudice its rights pursuant
                  to this Indemnity.

         (2)   The Tax  Indemnity  shall  continue  and remain in full force and
               effect in respect of all Taxes assessed  within the period during
               which Taxes may be assessed or reassessed under Applicable Law on
               the assumption that no waiver is filed after Closing  pursuant to
               the Canadian Tax Act or similar  provisions of provincial  income
               tax  legislation  unless  such  waiver is filed with the  written
               consent of the Seller.

         (3)   Each of the  Parties  on their  own  behalf  and on behalf of any
               successors or assigns  covenant that it will not request an audit
               by any taxation  authority  which may result in an  assessment to
               which the Tax Indemnity may apply.

         (4)   The Parties undertake to inform each other of any audit inquiries
               with respect to issues to which the Tax  Indemnity  may apply and
               to cooperate with each other in making any representations  prior
               to any assessment to which those indemnities may apply.

         (5)   The Parties agree that the Tax Indemnity is designed  (subject to
               the  limitations  set forth  therein) to minimize  the cash Taxes
               payable  by the  Companies  and,  accordingly,  Losses  shall not
               include   reductions  or  revisions  to  the  tax  pools  of  the
               Companies.  Notwithstanding  anything  in this  Agreement  to the
               contrary,  except for Losses  pursuant  to  4.3(1)(i)(A)  or (C),
               Losses,  for the purposes of this Section 4.3, shall only include
               increases in cash Taxes payable by the Purchaser or the Companies
               resulting  from a Claim  described in this  Section  assuming the
               maximum deductions of tax pools are taken. For greater certainty,
               the  Companies,  the Purchaser or any  successor  shall make such
               supplemental  filings,  including  refiling tax returns for prior
               periods in order to minimize the cash Taxes payable  attributable
               to any Claim  described in this Section 4.3. The Seller shall not
               be liable  under  this  Section  4.3 for any Claim to the  extent
               activities,  transactions  or filings  conducted or made by or in
               respect of the Companies or its successors after the Closing Date

                                       38


               (other than any activities, transactions and filings to which the
               Seller  has or is deemed to have  consented  and any Tax  Returns
               filed to  reflect  any  assessment  or  reassessment  made by any
               governmental  authority or agency in respect of Taxes for periods
               ending on or prior to the Closing  Date)  increase the cash Taxes
               payable,  or reduce the tax pools or other  deductions  otherwise
               available to reduce cash Taxes payable, in respect of the Claim.

         (6)   The  amounts  payable  in  respect  of the  Tax  Indemnity  shall
               constitute  and be treated by the Parties as an adjustment to the
               Base Price.

ARTICLE 5
                                 CLOSING PERIOD

5.1      Pre-Closing Activities

         During the Pre-Closing Period, and except for the Permitted
Transactions, the Seller shall cause the Companies to conduct their business in
substantially the same manner as prior to the Adjustment Date, including without
limitation but except as it relates to the Excluded Assets:

         (1)   conducting their business in the Ordinary Course of Business;

         (2)   maintaining  the  Assets  in  a  proper  and  prudent  manner  in
               accordance  with good oil and gas industry  practices,  including
               maintaining  adequate insurance,  in material compliance with all
               applicable  laws,  rules,  regulations,  orders and  directors of
               governmental and other competent authorities;

         (3)   paying or causing to be paid all costs and  expenses  relating to
               the Assets which become due during the Pre-Closing Period;

         (4)   performing  and  complying  with  all  covenants  and  conditions
               contained  in the Title  and  Operating  Documents  and any other
               agreements and documents to which the Assets are subject; and

         (5)   forthwith  providing  to the  Purchaser  all  authorizations  for
               expenditure,  notices,  mail  ballots,  rights of first  refusal,
               specific information and other documents in respect of the Assets
               which it or the Companies receives.  Upon receipt and review, the
               Purchaser  shall  provide its election  with respect  thereto the
               Seller and, subject to the Seller's right of refusal as described
               below,  the  Seller  shall  respond  to such  authorizations  for
               expenditure,  notices,  mail  ballots,  rights of first  refusal,
               specific  information  and other documents in accordance with the
               written  instructions  of the Purchaser,  if received on a timely
               basis,  and the  Purchaser  shall  reimburse  the  Seller for any
               out-of-pocket  third party  expenses  relating  to such  response
               provided that Closing  occurs.  If the Seller  disagrees with the
               Purchaser's  instructions,  the  Seller and the  Purchaser  shall
               negotiate  a solution in order that the Seller is able to respond
               to any such authorization for expenditure,  notice,  mail ballot,
               right of first refusal, specific information or other document.

                                       39


         The Seller will not, without the prior written consent of the Purchaser
(which shall not be unreasonably withheld) cause or permit any of the Companies
to engage in any practice or take any action or enter into any transaction
outside the Ordinary Course of Business, except for the Permitted Transactions
and as it relates to the Excluded Assets (for which the Seller assumes full
liability and responsibility). Without limiting the generality of the foregoing,
without the prior written consent of the Purchaser (which shall not unreasonably
be withheld), the Seller will not, except as it relates to the Excluded Assets,
and except for Permitted Transactions, permit the Companies during the
Pre-Closing Period to:

         (1)   commit to make (a) an  acquisition of an interest or interests in
               one  or  more   petroleum  and  natural  gas  leases  or  similar
               instruments (whether by purchase,  farmin or at a Crown sale), or
               (b) any  capital  expenditure  with  respect  to the  Assets,  or
               propose,  initiate or authorize any such capital expenditure,  if
               the Companies  reasonably expect that the  consideration  payable
               pursuant to such  acquisition or capital  expenditure will exceed
               $100,000 in any individual case,  except where required  urgently
               for  the  protection  of the  Environment,  property  or  Persons
               (including  the  prevention of death or injury),  other than Land
               Sales  Acquisitions.  Any  acquisitions  pursuant to a Land Sales
               Acquisition  shall  be  Excluded  Assets  and  the  cost  thereof
               adjusted  accordingly.  The  Purchaser's  consent shall be deemed
               given to any capital  expenditure  unless within two (2) Business
               Days of request for such  consent,  the  Purchaser  notifies  the
               Seller in writing that it does not consent to such expenditure;

         (2)   amend  or  terminate  any  Material  Contracts  in  any  Material
               respect;

         (3)   enter  into or amend  any new  employment  contract  or  employee
               benefit program;

         (4)   sell,  transfer  or dispose  of,  grant an  Encumbrance  on or in
               respect  of,  surrender  or abandon  the whole or any part of the
               Assets, except the creation of Permitted  Encumbrances,  the sale
               of Petroleum  Substances  produced from the Lands or lands pooled
               or unitized  therewith in the ordinary course or the surrender of
               a Lease in the Ordinary Course of Business;

         (5)   amend or terminate any Material Title and Operating  Documents or
               enter into any new Material  agreement or commitment  relating to
               the Assets;

         (6)   enter  into any  transaction  not in the  Ordinary  Course of its
               Business;

         (7)   borrow money or incur any indebtedness for borrowed money, except
               the Companies' Debt;

         (8)   increase or decrease the principal of the Companies'  Debt except
               pursuant to the Mirant Credit Agreement in the Ordinary Course of
               its Business;

         (9)   make  loans  or  advances,   excluding   loans  and  advances  in
               accordance  with the terms of operating  agreements  to which the
               Companies  are a party or by which either is bound and  excluding
               routine  advances to  employees  of the  Companies  for  expenses
               incurred in the Ordinary Course of Business;


                                       40

         (10)  issue,  sell or  agree  to  issue  or sell  any  shares,  rights,
               options, warrants or other securities of any of the Companies;

         (11)  purchase,  cancel, retire, redeem or otherwise acquire any of the
               Shares;

         (12)  change,  amend  or  modify  the  Articles  or  by-laws  or  other
               constating documents of any of the Companies;

         (13)  declare,   set  aside,   make  or  pay  any   dividend  or  other
               distribution   in  respect  of  any  securities   issued  by  the
               Companies;

         (14)  alter any of the Employee Plans, except as required by Applicable
               Law;

         (15)  increase the salaries,  benefits or other compensation payable to
               any of its directors, officers or employees; and

         (16)  change  bookkeeping,  record  keeping or  accounting  methods and
               procedures.

The Seller shall cause the Permitted Transactions to be effected at or prior to
Closing. The Purchaser acknowledges that the Seller or its Affiliate shall be
entitled to the Interim Period Excluded Assets Net Revenues.

5.2      Insurance

         During the Pre-Closing Period, the Seller will cause the Companies to
maintain the insurance specified in Schedule H or substantially similar
insurance. The Seller shall have no obligation to maintain or cause such parties
to maintain any insurance after the Closing Date.

5.3      Due Diligence

         The Companies shall permit the Purchaser and its legal counsel and
authorized representatives to have full access to all files, premises,
properties, personnel, books, records (including Tax Records), auditors,
contracts and documents of or pertaining to the Companies and their respective
subsidiaries and affiliates and any predecessor corporations or entities during
the Pre-Closing Period for purposes of performing due diligence with respect to
the Companies and its assets and affairs. The provisions of the Confidentiality
Agreement shall continue to be applicable to any information made available by
such parties pursuant to the provisions of this Agreement.

5.4      Required Approvals

         The Parties shall use all reasonable commercial efforts to obtain the
Required Approvals prior to the Time of Closing. Each Party shall provide such
information and cooperation as the other Party may reasonably request in
connection therewith.

5.5      Tax Elections

         Other than as expressly provided in this Agreement, no tax elections
have been or will be filed in respect of any of the Companies between the

                                       41


Adjustment Date and the Closing, except with the prior written consent of the
Purchaser, which consent shall not be unreasonably withheld.

ARTICLE 6
                                   CONDITIONS

6.1      Conditions for the Benefit of the Purchaser

         (1)   The Purchaser's  obligation to buy the Shares from the Seller (or
               pursuant to Section 6.4 and Schedule Q,  purchase the Oil and Gas
               Assets)  pursuant  hereto is subject to the following  conditions
               (which  are for the  exclusive  benefit of the  Purchaser)  being
               satisfied  in all  respects  at or prior to the Time of  Closing,
               which  conditions  shall be deemed  satisfied unless they are not
               satisfied to the extent one or more failures of such  conditions,
               either alone or in the aggregate, have had or could reasonably be
               expected to have a Material  Adverse  Effect on the  Purchaser or
               the Companies:

               (i)  the  representations  and warranties of the Seller set forth
                    in  Sections  3.1 through  3.4  inclusive  shall be true and
                    correct  at the Time of  Closing  with the  same  force  and
                    effect as if made at and as of such time;

               (ii) the  Seller  and  the  Companies  shall  have  performed  or
                    complied in all material respects with all covenants in this
                    Agreement to be performed or complied  with by the Seller or
                    the  Companies  at or prior to the Time of Closing  pursuant
                    hereto;

               (iii)all  Required  Approvals  shall have been  obtained on terms
                    reasonably  acceptable to the Purchaser,  at or prior to the
                    Time of Closing;

               (iv) at Closing,  the Seller shall have delivered all items which
                    it is required to deliver pursuant to Section 7.2;

               (v)  the Seller  shall have  delivered  opinions of the  Seller's
                    legal  counsel that this  Agreement  (and  agreements  to be
                    executed by the Seller or its  Affiliates  pursuant  hereto)
                    has been duly  authorized,  executed  and  delivered  by the
                    Seller in form and substance reasonably  satisfactory to the
                    Purchaser;

               (vi) there shall not be any suit, action or other proceeding that
                    shall,  at  Closing,  be pending  against any of the Parties
                    before any  governmental  entity or other agency and no law,
                    regulation  or policy shall have been  proposed,  enacted or
                    applied: (i) making illegal or seeking to restrain, prohibit
                    or obtain  damages or other  relief in  connection  with the
                    consummation  of  the  transactions   contemplated  by  this
                    Agreement;  (ii)  prohibiting  or  materially  limiting  the
                    ownership  or  operation  by  the  Companies  of a  material
                    portion of the business or assets  thereof or requiring  the
                    Purchaser to dispose of or hold  separately any such portion
                    of any Shares or Assets, as applicable;  or (iii) making the

                                       42


                    consummation  of  the  transactions   contemplated  by  this
                    Agreement   materially  more  costly  to  the  Purchaser  or
                    materially reducing the value of the Shares;

               (vii)the Seller shall have  delivered  releases or  discharges of
                    the  Companies'  Debt, and all  obligations  under the other
                    Indentures,  and of all other obligations that relate to the
                    Excluded  Assets  or  Encumbrances   (other  than  Permitted
                    Encumbrances)  which are not permitted under this Agreement,
                    but where  Section 6.4 is  applicable,  only  discharges  of
                    security  registerable  against the  Purchased  Assets or an
                    undertaking  to  discharge  in form and  content  reasonably
                    satisfactory  to the  Purchaser  will be required,  provided
                    that the failure to provide any such releases, discharges or
                    undertakings  to  discharge  (to  the  extent  the  relevant
                    obligation  is  Material)  will be deemed to have a Material
                    Adverse Effect; and

               (viii) the Seller shall have, and shall have caused the Companies
                    to have transferred from the Companies,  all Excluded Assets
                    on the terms and conditions set forth in Schedule I.

         (2)   If  Section  6.1(1) is not  satisfied  at the Time of  Closing or
               waived by the  Purchaser,  the Purchaser  may, at or prior to the
               Time of Closing, at its sole option:

               (i)  rescind  this  Agreement  by notice to the Seller,  in which
                    event Section 13.1 will be applicable; or

               (ii) waive such  condition in whole or in part without  prejudice
                    to any of its rights in the event of  non-performance of any
                    other term, covenant or condition in whole or in part.

6.2      Conditions for the Benefit of the Seller

         (1)   The  Seller's  obligation  to sell the  Shares  or,  pursuant  to
               Section 6.4 and Schedule Q, the Companies' obligation to sell the
               Oil and Gas  Assets  (in which  case the  condition  set forth in
               Section  6.2(1)(vi)  shall not apply) to the  Purchaser  pursuant
               hereto is subject to the following  conditions (which are for the
               exclusive  benefit of the Seller) being satisfied in all respects
               at or prior to the Time of  Closing,  which  conditions  shall be
               deemed  satisfied unless they are not satisfied to the extent one
               or more  failures  of such  conditions,  either  alone  or in the
               aggregate  have had, or could  reasonably  be expected to have, a
               Material Adverse Effect on the Seller or the Companies:

               (i)  the  representations  and  warranties  of the  Purchaser set
                    forth in Section  3.6 shall be true and  correct at the Time
                    of Closing  with the same force and effect as if made at and
                    as of such time;

               (ii) the  Purchaser  shall  have  performed  or  complied  in all
                    material  respects  with  all of the  terms,  covenants  and
                    conditions  of this  Agreement  to be  performed or complied
                    with by the  Purchaser  at or prior  to the Time of  Closing
                    pursuant hereto;

                                       43


               (iii)at Closing,  the Purchaser shall have delivered all items it
                    is required to deliver pursuant to Section 7.3;

               (iv) all  Required  Approvals  shall have been  obtained on terms
                    acceptable to the Seller, acting reasonably,  at or prior to
                    the Time of Closing;

               (v)  the  Purchaser  shall  have  delivered  an  opinion  of  the
                    Purchaser's  legal counsel that this Agreement has been duly
                    authorized,  executed and delivered by the Purchaser and PEI
                    in form and substance satisfactory to the Purchaser;

               (vi) the Seller  shall have either (i)  successfully  completed a
                    tender offer for its 11 1/2% Senior  Secured  Notes due 2004
                    (including those 111/2% Senior Notes Series D due 2004 which
                    were  issued  under the January  27,  1998  Indenture)  (the
                    "Notes")  which  shall  have  resulted  in  the  release  of
                    Canadian  Abraxas as an Issuer (as  defined in the  December
                    21, 1999 Indenture and January 27, 1998 Indenture  governing
                    the  Notes)  of the  Notes  and  from  any  obligations  and
                    liabilities   under  the  Notes,   the   December  21,  1999
                    Indenture,  the January 27, 1998  Indenture and the Security
                    Documents (as defined in the December 21, 1999 Indenture) or
                    (ii)  received  the  consent of a  sufficient  number of the
                    holders  of the Notes so that  Canadian  Abraxas  shall have
                    been  released  as an  Issuer  of the  Notes  and  from  any
                    obligations  and liabilities  under the Notes,  the December
                    21, 1999  Indenture,  the January 27, 1998 Indenture and the
                    Security Documents; and

               (vii)there  shall  not be any suit,  action  or other  proceeding
                    that shall, at Closing,  be pending before any  governmental
                    entity  or other  agency  and no law,  regulation  or policy
                    shall have been proposed,  enacted or applied making illegal
                    or seeking to restrain,  prohibit or obtain damages or other
                    relief  in   connection   with  the   consummation   of  the
                    transactions contemplated by this Agreement.

         (2)   Subject to Section 6.4, if Section 6.2(1) is not  satisfied,  the
               Seller  may,  at or before the Time of Closing but not after that
               time, in its sole option:

               (i)  rescind this Agreement by notice to the Purchaser,  in which
                    event Section 13.1 will be applicable; or

               (ii) waive such  condition in whole or in part without  prejudice
                    to any of its rights in the event of  non-performance of any
                    other term, covenant or condition in whole or in part.


                  Notwithstanding the foregoing, the Seller shall not be
                  entitled to terminate its obligations pursuant to Section 6.4
                  if the condition set forth in Section 6.2(1)(vi) has not been
                  satisfied.
                                       44


6.3      Efforts to Satisfy Conditions

         Each Party shall use all reasonable commercial efforts and shall
proceed diligently, honestly and in good faith to cause the conditions set forth
in Section 6.1 and 6.2 which are within its reasonable control to be satisfied.
Each Party shall provide such information and cooperation to the other Party as
it may reasonably request in connection with the satisfaction of such
conditions.

6.4      Asset Sale Alternative

         In the event the Seller is unable to satisfy the condition set forth in
Section 6.2(1)(vi) on or prior to the Time of Closing (as the Time of Closing
may be extended pursuant to Section 6.5), the Companies shall sell and the
Purchaser shall buy the Oil and Gas Assets other than the Excluded Assets on the
Closing Date and the provisions of this Agreement shall apply to such sale
except as modified below:

         (1)   On the Seller determining that the condition set forth in Section
               6.2(1)(vi) cannot be satisfied prior to Closing, the Seller shall
               promptly provide notice to the Purchaser of such determination;

         (2)   The Base Price shall remain the same; and

         (3)   The provisions set forth in the attached  Schedule Q shall become
               effective  and replace the  provisions of Articles 2, 7, 8, and 9
               (except Section 9.3) hereof.  Article 4 hereof shall no longer be
               applicable.

6.5      Closing Extension

         In the event the Seller determines that the condition set forth in
Section 6.2(1)(vi) will not be satisfied by the scheduled Closing Date, the
Seller shall be entitled to extend the Closing Date by up to fifteen (15)
Business Days by notice to the Purchaser.

ARTICLE 7
                                     CLOSING

7.1      Closing

         The Closing shall occur at the Place of Closing at the Time of Closing.

7.2      Deliveries by the Seller at Closing

         At Closing, the Seller shall deliver to the Purchaser:

         (1)   the  certificates  representing  the  Shares  duly  endorsed  for
               transfer by the Seller and new share  certificates  issued in the
               name of the Purchaser in respect of the Shares;

         (2)   the Farmout Agreements, duly executed by the Farmor;

         (3)   the Farmor Guarantee duly executed by the Farmor;

                                       45


         (4)   certified copies of the documents contemplated in Schedule "I";

         (5)   certificates of the appropriate government officials, dated on or
               after the  Adjustment  Date,  evidencing  the  existence and good
               standing  of the  Seller,  the  Farmor and the  Companies  in the
               jurisdiction of its organization  and each other  jurisdiction in
               which  its  good  standing  is  required  by  the  extent  of its
               business;

         (6)   the minute books,  corporate  seals and all corporate  records of
               the Companies;

         (7)   a certificate of the Seller in the form of Schedule B;

         (8)   except as otherwise  directed by the Purchaser,  resignations and
               releases,  in the form of Schedule R, of all directors,  officers
               and Employees of the Companies;

         (9)   the legal opinion referred to in Paragraph 6.1(1)(v);

         (10)  certified  copies  of  directors'  resolutions  of the  Companies
               confirming  approval  of  the  transfer  of  the  Shares  to  the
               Purchaser in  accordance  with the terms and  conditions  of this
               Agreement;

         (11)  the certificate defined in Section 4.1(1) hereof;

         (12)  a receipt for the Adjusted Purchase Price;

         (13)  evidence  reasonably  satisfactory  to  the  Purchaser  that  the
               Excluded  Assets shall have been  conveyed  out of the  Companies
               without recourse to the Companies; and

         (14)  such other items as may be specifically required hereunder.

7.3      Deliveries by the Purchaser at Closing

         At Closing, the Purchaser shall:

         (1)   pay the Adjusted Purchase Price to the Seller, subject to Section
               4.1;

         (2)   deliver to the Seller the Farmout  Agreements,  duly  executed by
               the Purchaser;

         (3)   deliver a certificate  of an officer or director of the Purchaser
               in the form of Schedule B; and

         (4)   deliver the legal opinion referred to in Paragraph 6.2(1)(v).

7.4      Closing Escrow

         The items tabled at Closing pursuant to Sections 7.2 and 7.3 shall be
held in escrow until all of such items have been tabled, whereupon such escrow
shall be terminated and the items described in Section 7.2 shall be delivered to
the Purchaser and the items described in Section 7.3 shall be delivered to the
Seller and the Closing shall have occurred. If such escrow is not released on or
before 4:00 p.m. (Calgary Time) on the Closing Date and the Parties do not agree

                                       46

to an extension of the escrow, the Closing shall be deemed not to have occurred
and the documents and certificates tabled by a Party pursuant to this Article 7
shall be returned to that Party.

ARTICLE 8
                             ENVIRONMENTAL INDEMNITY

8.1      Indemnity

         Except insofar as the Seller is indemnifying the Purchaser and others
pursuant to Section 9.1, the Purchaser shall, and shall cause the Companies to,
indemnify and save harmless the Seller and its Affiliates and their
Representatives from and against the Companies' Environmental and Reclamation
Liabilities related to the Oil and Gas Assets and all Losses which they may
suffer, sustain, pay or incur in respect thereof, whether arising or relating to
events occurring on or after the Closing Date, except any such Liabilities or
Losses as may have been caused by the wilful misconduct of any such indemnified
Person.

ARTICLE 9
                               GENERAL INDEMNITIES

9.1      Seller's Indemnity
         Subject to Section 9.3, the Seller shall indemnify and save harmless
the Purchaser and its Affiliates and their Representatives from and against all
Losses and Liabilities which they suffer, sustain, pay or incur as a consequence
of a breach of a representation and warranty made by the Seller in Section 3.1,
3.2, 3.3 or 3.4 or a breach by the Seller of any of the covenants made by it in
this Agreement, except any such Losses as have been caused by or result from the
gross negligence or wilful misconduct of any such indemnified Person.

         The Seller shall indemnify and save harmless the Purchaser and its
Affiliates and their Representatives from and against all Losses and Liabilities
which they suffer, sustain, pay or incur relating to the Excluded Assets or the
operation thereof or relating to the Employees which occur before, on or after
the Time of Closing, except any such Losses as have been caused by or result
from the gross negligence or wilful misconduct of any such indemnified Person.

         The Parties agree that for the purposes of this Section 9.1, in the
case of any misrepresentation or breach of warranty of the Seller, the measure
of the Purchaser's Losses in respect thereof will be, dollar for dollar, the
difference in what would have been the position (financial and otherwise) of the
Companies had such representation been true or the warranty not breached and the
actual position (financial and otherwise) of the Companies (given such
misrepresentation or breach of warranty).

9.2      Purchaser's Indemnity

         The Purchaser shall indemnify and save harmless the Seller and their
Affiliates and their Representatives from and against all Losses which they
suffer, sustain, pay or incur as a consequence of:

         (1)   a breach of a representation or warranty contained in Section 3.6
               or a breach by the  Purchaser  of a  covenant  made by it in this
               Agreement; or

                                       47


         (2)   subject to the Seller's  obligations  in respect of the indemnity
               contained in Section 9.1, any matter or circumstance  relating to
               Oil and Gas Assets or the operation  thereof which occurs before,
               on or after the Time of Closing or which relates to the Companies
               and occurs after the Time of Closing,

except any such Losses as have been caused by or result from the gross
negligence or wilful misconduct of any such indemnified Person.

9.3      Limitations on Seller's Indemnity

         (1)   No Claim against the Seller for performance of an indemnity or in
               respect of a breach of any covenant,  representation  or warranty
               made by that Seller in this  Agreement  (other  than  pursuant to
               Section  4.3 or 9.5  hereof)  shall  be made  or be  enforceable,
               whether by legal proceedings or otherwise,  unless written notice
               of such Claim is given by the  Purchaser  to that  Seller  within
               nine (9) months from the Closing Date;

         (2)   The  maximum  cumulative  liability  of the  Seller in respect of
               indemnities and breaches of the  representations,  warranties and
               covenants made by the Seller in this  Agreement  shall not exceed
               the Base Price;

         (3)   No Claim against the Seller for performance of an indemnity or in
               respect of a breach of any covenant,  representation, or warranty
               made  by  the  Seller   arising  out  of  any  fact,   matter  or
               circumstance  known  to the  Purchaser  at  Closing  (other  than
               pursuant to Section 4.3(1)(i) or (iii) or 9.5 hereof);

         (4)   Except as otherwise set out herein,  the Purchaser's  sole remedy
               for  a  misrepresentation  or  breach  of  a  warranty  or  other
               agreement contained in this Agreement is limited to the indemnity
               contained in Section 9.1 and is limited by the provisions of this
               Section 9.3.

         (5)   Notwithstanding  anything  to the  contrary  set  forth  in  this
               Agreement, the Seller shall have no liability to the Purchaser or
               obligation to indemnify the Purchaser for any specific  matter or
               claim for which the  Purchaser  has received an adjustment to the
               Purchase Price to the extent of such adjustment.

         (6)   The  Purchaser  shall not be entitled to make a Claim against the
               Seller for indemnity  pursuant to this Agreement unless and until
               the  aggregate  amount of all Losses  with  respect to all Claims
               asserted  by the  Purchaser  under  this  Agreement  (other  than
               pursuant to Section  4.3 or 9.5)  exceeds  $1,500,000.  Once such
               minimum  threshold in Losses has been sustained by the Purchaser,
               the entirety of all Losses  sustained by the  Purchaser  shall be
               compensable   under  this  Section  9.3,  subject  to  the  other
               provisions of this Section. Claims pursuant to Section 4.3 or 9.5
               shall not be included in claims for the  purposes of this Section
               9.3(6).

         (7)   The Purchaser's  Losses  hereunder shall be deemed reduced by the
               amount of any insurance proceeds and any tax benefits received by
               the Purchaser with respect to such Losses.

                                       48

         (8)   The  Purchaser  shall not be  entitled  to  indemnity  under both
               Section 4.3 and 9.1 for the same Loss.

9.4      Indemnification Procedure

         (1)   For purposes of this Section 9.4, the term  "Indemnifying  Party"
               when used in connection with a Claim shall mean the Person having
               an  obligation  to indemnify the other Party with respect to such
               Claim pursuant to this Agreement  (other than under Section 4.3),
               and the term  "Indemnified  Party" when used in connection with a
               particular  Claim  shall mean the  Person  having the right to be
               indemnified  with  respect  to  such  Claim  by the  other  Party
               pursuant to this Agreement (other than under Section 4.3).

         (2)   To make claim for  indemnification,  an  Indemnified  Party shall
               notify the  Indemnifying  Party of its claim  under this  Section
               9.4,  including the specific  details of and specific basis under
               this Agreement for its claim (the "Claim  Notice").  In the event
               that the claim  for  indemnification  is based  upon a claim by a
               third  party  against  the  Indemnified  Party  (a  "Third  Party
               Claim"),  the  Indemnified  Party shall  provide its Claim Notice
               promptly after the Indemnified  Party has actual knowledge of the
               Third Party Claim and shall enclose a copy of all papers (if any)
               served with respect to the Third Party Claim;  provided  that the
               failure of any Indemnified  Party to give notice of a Third Party
               Claim as  provided  in this  Section  9.4 shall not  relieve  the
               Indemnifying Party of its obligations under this Agreement except
               to the extent such  failure  results in  insufficient  time being
               available to permit the Indemnifying  Party to effectively defend
               against the Third Party Claim or otherwise materially  prejudices
               the  Indemnifying  Party's  ability to defend  against  the Third
               Party Claim. In the event that the claim for  indemnification  is
               based upon an inaccuracy or breach of a representation, warranty,
               covenant  or  agreement,  the  Claim  Notice  shall  specify  the
               representation,   warranty,   covenant  or  agreement  which  was
               inaccurate or breached.

         (3)   In the case of a claim  for  indemnification  based  upon a Third
               Party Claim, the  Indemnifying  Party shall have 30 days from its
               receipt  of the  Claim  Notice to notify  the  Indemnified  Party
               whether  it  admits  or  denies  its   liability  to  defend  the
               Indemnified Party against such Third Party Claim at the sole cost
               and expense of the Indemnifying  Party. The Indemnified  Party is
               authorized,  prior to and during such 30-day period,  to file any
               motion,  answer or other pleading that it shall deem necessary or
               appropriate to protect its interests or those of the Indemnifying
               Party and that is not prejudicial to the Indemnifying Party.

         (4)   If the Indemnifying Party admits its liability, it shall have the
               right and obligation to diligently  defend,  at its sole cost and
               expense, the Third Party Claim. The Indemnifying Party shall have
               full  control of such  defense  and  proceedings,  including  any
               compromise   or   settlement   thereof.   If   requested  by  the
               Indemnifying Party, the Indemnified Party agrees to cooperate, at
               the cost and expense of the Indemnifying Party, in contesting any
               Third Party Claim which the Indemnifying Party elects to contest.
               The Indemnified  Party may  participate in, but not control,  any
               defense or settlement of any Third Party Claim  controlled by the

                                       49


               Indemnifying   Party   pursuant  to  this  Section   9.4(4).   An
               Indemnifying  Party shall not, without the written consent of the
               Indemnified Party, (i) settle any Third Party Claim or consent to
               the entry of any  judgment  with respect  thereto  which does not
               include an unconditional written release of the Indemnified Party
               from all  liability  in respect of such Third Party Claim or (ii)
               settle  any  Third  Party  Claim or  consent  to the entry of any
               judgment with respect  thereto in any manner that may  materially
               and  adversely  affect the  Indemnified  Party  (other  than as a
               result of money damages covered by the indemnity).

         (5)   If the Indemnifying  Party does not admit its liability or admits
               its  liability  but fails to  diligently  prosecute or settle the
               Third  Party  Claim,  then the  Indemnified  Party shall have the
               right to defend  against  the Third  Party Claim at the sole cost
               and  expense  of the  Indemnifying  Party,  with  counsel  of the
               Indemnified  Party's  choosing,  subject  to  the  right  of  the
               Indemnifying  Party to admit its liability and assume the defense
               of the Third Party Claim at any time prior to settlement or final
               determination  thereof.  If the  Indemnifying  Party  has not yet
               admitted its liability for a Third Party Claim,  the  Indemnified
               Party shall send written notice to the Indemnifying  Party of any
               proposed  settlement  and the  Indemnifying  Party shall have the
               option for 10 days following  receipt of such notice to (i) admit
               in writing  its  liability  for the Third Party Claim and (ii) if
               liability is so admitted, reject, in its reasonable judgment, the
               proposed settlement.

         (6)   In the case of a claim for indemnification not based upon a Third
               Party Claim, the  Indemnifying  Party shall have 30 days from its
               receipt of the Claim Notice to (i) cure the Losses complained of,
               (ii) admit its  liability  for such  Losses or (iii)  dispute the
               claim for such Losses. If the Indemnifying  Party does not notify
               the Indemnified Party within such 30 day period that it has cured
               the Losses or that it  disputes  the claim for such  Losses,  the
               amount of such Losses shall conclusively be deemed a liability of
               the Indemnifying Party hereunder.

9.5      Specific Claim Indemnity

         Schedule C identifies two law suits commenced by each of Canadian
Natural Resources Limited and by Husky Oil Operations Ltd. (the "Indemnified
Claims"). As part of the Permitted Transactions, it is intended that an
Affiliate of the Seller shall assume all responsibility for the Indemnified
Claims and shall be entitled to any benefit accruing in respect of such
Indemnified Claims. Accordingly, the Seller shall and shall cause the Affiliate
to indemnify and hold harmless the Companies from and against all Losses arising
pursuant to such Indemnified Claims. The indemnification procedure set forth in
Section 9.4 shall apply to such indemnity and the Seller and its affiliates
shall have the right and obligation to diligently defend the Indemnified Claims
in the manner specified by Section 9.4(4).

ARTICLE 10
                                    EMPLOYEES

10.1     Choosing Employees

         The Purchaser shall identify those Employees which the Purchaser has
determined it wishes to retain for its operations and provide notice to the
Seller with the names of such Employees on or prior to December 11, 2002 (such

                                       50

identified employees being referred to as "Transfer Employees"). The Seller and
the Purchaser shall meet to determine whether any Transfer Employee is desired
by both parties and shall attempt to agree on a reasonable division of such
Employees. Subject to any agreement reached on division of such Employees, the
Seller shall offer to employ, hire or retain, as appropriate, all Employees
which are not Transfer Employees (any such remaining employee being referred to
as a "Retained Employee"). The Seller shall also be entitled to offer employment
or otherwise offer to hire or retain any Transfer Employee, provided the Seller
has advised the Purchaser that it intends to do so. Any such Transfer Employee
so employed, hired or retained by the Seller shall be deemed to be a Retained
Employee and not a Transfer Employee.

10.2     Recognition of Service

         The Purchaser covenants that the Purchaser and all Affiliates of the
Purchaser will recognize the period of service which an Employee (other than a
Retained Employee) has had with Grey Wolf, Canadian Abraxas and their
predecessors for all purposes of such Employee's employment with the Purchaser
and such Affiliates following Closing.

10.3     Retained Employees

         The Seller or its nominee shall offer to employ, hire or retain all
Retained Employees on or prior to Closing. The Seller shall indemnify and hold
harmless the Purchaser from and against all costs in respect of the termination
of employment of all Retained Employees and, in the event Section 6.4 becomes
effective, all Transfer Employees who do not accept an offer of employment with
the Purchaser or any of its Affiliates following Closing (and in such case, such
non-accepting Transfer Employees shall be deemed to be Retained Employees and
cease to be Transfer Employees), including all severance amounts, damages,
benefits and related costs, expenses and other liabilities incurred by the
Companies in connection with the employment or termination of employment of such
Employees and such amounts shall be treated as costs incurred prior to the
Adjustment Date and the Purchase Price Adjustment Amount increased accordingly.

10.4     Transfer Employees

         (1)   The Purchaser and, if Section 6.4 is not  applicable,  Grey Wolf,
               shall be responsible  for all  obligations  arising in respect of
               the termination of the employment of all Transfer Employees.

         (2)   The Purchaser and, if Section 6.4 is not  applicable,  Grey Wolf,
               shall indemnify and hold harmless the Seller from and against any
               and all Losses which may be suffered by the Seller arising out of
               any  claim by any  Transfer  Employees  who are not,  and are not
               deemed  to be,  Retained  Employees  for  any  severance  amount,
               pursuant  to  any   employment  or  benefit  plan,  for  wrongful
               dismissal,  for any bonus or other incentive compensation and all
               damages,  costs,  expenses  and  other  liabilities  incurred  in
               respect thereof.

         (3)   The Purchaser,  and if Section 6.4 is not applicable,  Grey Wolf,
               agree that  neither  they nor any  Affiliate  shall,  without the
               prior  written  consent of the Seller,  hire,  retain,  employ or

                                       51


               otherwise  solicit for  employment  any  Retained  Employee for a
               period of twelve (12) months following Closing.

         (4)   The  Seller  agrees  that  neither  it nor any  Affiliate  shall,
               without the prior written consent of the Purchaser, hire, retain,
               employ or  otherwise  solicit  for  employment  after the Time of
               Closing any  Transfer  Employee  who  continues to be employed by
               Grey  Wolf  or who  accepts  an  offer  of  employment  with  the
               Purchaser  or an  Affiliate  for a period of twelve  (12)  months
               following Closing.

10.5     Asset Transaction

         In the event that Section 6.4 and Schedule Q become applicable:

         (1)   The  Retained  Employees  shall  continue  with Grey Wolf and the
               Purchaser  shall hire,  retain,  employ or otherwise  solicit for
               employment  all  Transfer  Employees.  Grey  Wolf  shall  not  be
               responsible  for  Transfer  Employees  who  accept  an  offer  of
               employment with the Purchaser.

         (2)   The  Purchaser  shall  indemnify  and hold harmless Grey Wolf and
               Abraxas  from any and all Losses which may be suffered by Abraxas
               or  the  Companies  arising  out  of any  claim  by any  Transfer
               Employees  who accept an offer of  employment  with the Purchaser
               for any severance  amount,  pursuant to any employment or benefit
               plan, for wrongful  dismissal,  for any bonus or other  incentive
               compensation   and  all  damages,   costs,   expenses  and  other
               liabilities incurred in respect thereof.

         (3)   The Purchaser shall offer to hire,  retain or employ all Transfer
               Employees  on  employment  terms  substantially  the same as such
               Transfer  Employees'  current employment terms (including matters
               related to compensation,  incentives,  benefits,  title, role and
               responsibility).

10.6     Transitional Assistance

         Following Closing, the Seller, Purchaser and the Companies shall use
reasonable efforts to provide assistance from time to time to ensure the orderly
transition of the business of Newco (as defined in Schedule I) and the Companies
as contemplated in this Agreement. The Parties acknowledge that, from time to
time, they will require assistance from Employees which have been obtained or
hired by the other and the Parties shall use reasonable efforts to make
available their Employees to assist in such business transition.

                                   ARTICLE 11
                                  DUE DILIGENCE

11.1     Title Opinions

         Prior to the date hereof, the Seller has provided to the Purchaser a
copy of the Title Opinions. The Purchaser acknowledges that it has reviewed the

                                       52


Title Opinions.

11.2     Pre-Closing Title Review

         Prior to the Closing, the Seller shall cause the Companies to make
available to the Purchaser and its representatives, all Title and Operating
Documents (including contracts, correspondence, files and prior title opinions)
in its possession pertaining to the Oil and Gas Assets for purposes of
permitting the Purchaser to review the Companies' title to the Oil and Gas
Assets. The provisions of the Confidentiality Agreement shall continue to be
applicable to any information made available by the Companies pursuant to this
Agreement. The Purchaser shall conduct its review of the Companies' title to the
Oil and Gas Assets with reasonable diligence. If there are Title Defects which
affect any of the Oil and Gas Assets which are not disclosed in the Title
Opinions ("New Title Defects"), the Purchaser may give notice of such New Title
Defects to the Seller not later than November 21, 2002 and the Seller shall use
reasonable efforts to rectify such defects. Such notice shall specify the New
Title Defects in reasonable detail, the Oil and Gas Assets directly affected
thereby, the Purchaser's reasonable estimate of the decrease in value of the
affected Oil and Gas Assets resulting from the New Title Defects (the "Defect
Value") and the Purchaser's reasonable requirements for rectification or curing
thereof. The Seller shall make reasonable efforts to cure the New Title Defects
prior to the Closing Date. If the aggregate Defect Value of the New Title
Defects exceeds $5,000,000, the Base Price shall be reduced by the excess. The
"Defect Value" of a New Title Defect is the amount by which such New Title
Defect reduces the value of the Oil and Gas Assets affected thereby, determined
based on the values of the individual properties as set forth in Schedule N.
Except for the obligation to reduce the Base Price as provided in this Section
11.2, the Seller shall have no liability for or obligation with respect to
Losses, consequential or indirect losses or losses of profits incurred by the
Purchaser as the result of Title Defects, whether incurred or identified by the
Purchaser or the Companies before or after Closing.

11.3     Termination Right

         If the aggregate value of the Title Defects of which the Purchaser
gives notice to the Seller in accordance with and within the time specified in
Section 11.2 which have not been cured to the Purchaser's reasonable
satisfaction at the Seller's cost is greater than twenty five million
($25,000,000) dollars, the Purchaser may terminate this Agreement by giving
written notice to the Seller prior to the Closing Date, but not thereafter.

11.4     Arbitration

         If there is a dispute between the Parties with respect to the existence
or value of a Title Defect, the following provisions shall be apply:

         (1)   the  dispute  shall be resolved  by  arbitration  before a single
               arbitrator, which will be:

               (i)  in the case of a dispute with respect to the existence a New
                    Title  Defect,  a recognized  oil and gas lawyer in Calgary,
                    Alberta  other than a member of a firm who has given  advice
                    to a Party in connection herewith; and

               (ii) in the case of a dispute  with respect to the value of a New
                    Title Defect, a recognized reservoir engineering  consultant
                    in Calgary, Alberta other than a consultant or employee of a
                    consulting   firm  who  has  given  advice  to  a  Party  in

                                       53


                    connection herewith.

         (2)   each Party shall submit to the arbitrator  such Party's  proposed
               resolution of the dispute and the arbitrator  will be required to
               select one of such proposals as the resolution of the dispute;

         (3)   if the  dispute is in respect of the amount of an  adjustment  to
               the Base Price  pursuant to Section  11.2 and is not  resolved by
               the Time of Closing,  the Closing Date will be delayed  until the
               second Business Day after the arbitration is completed;

         (4)   the  arbitrator  will be  instructed  to  communicate  his or her
               determination to the Parties within ten (10) days of the referral
               of the dispute to the arbitration;

         (5)   if the  arbitration  delays the  Closing  Date beyond the date on
               which it would otherwise have occurred:

               (i)  if the Seller wins the  arbitration,  Interim Interest shall
                    be  calculated  as  provided  in the  definition  of Interim
                    Interest; and

               (ii) if the Purchaser wins the arbitration, Interim Interest will
                    be  calculated  only to the date  which  would have been the
                    Closing Date if the arbitration had not delayed the Closing.

         Each Party will act in good faith in respect of such disputes.

                                   ARTICLE 12
                                    SURVIVAL

12.1     Survival

         Subject to the limitations and provisions set forth in this Agreement,
notwithstanding the occurrence of Closing and the items delivered at Closing
pursuant hereto, the representations, warranties, covenants and indemnities
contained in this Agreement shall survive the Closing and the delivery of the
items delivered at Closing pursuant hereto for the benefit of the Parties in
accordance with terms hereof. If any document executed at or after Closing,
pursuant hereto is inconsistent with the provisions of this Agreement, the
provisions of this Agreement shall prevail unless the Parties expressly and
explicitly agree to the contrary.

                                   ARTICLE 13
                                   TERMINATION

13.1     Termination

         If this Agreement is terminated prior to the Closing occurring pursuant
to Sections 6.1, 6.2, or 11.4, the Parties shall be released from all
obligations under this Agreement except the Confidentiality Agreement shall
remain in full force and effect in accordance with its terms, the provisions of
Section 2.3 (Deposit) shall remain in full force and effect and each Party shall
remain liable for breaches by it of this Agreement occurring prior to such

                                       54


termination. Subject to the foregoing provisions of this Section, following such
termination, each Party shall be responsible for the costs and expenses incurred
by it in connection with this Agreement and the transactions contemplated
hereby.

ARTICLE 14
                                   ARBITRATION

14.1     Procedure

Excluding matters dealt with in Section 11.4, any controversy submitted to
arbitration pursuant to this Agreement shall be subject to the following
principles:

         (1)   Upon written  demand of a Party,  representatives  of the Parties
               shall meet and  attempt to appoint a single  arbitrator.  If such
               representatives are unable to agree on a single arbitrator within
               five (5) days of such  demand,  then upon  written  demand by any
               Party,  the Companies and the  Purchaser  shall,  within ten (10)
               days  of  such  demand,  each  name  an  arbitrator  and  the two
               arbitrators so named shall promptly thereafter choose a third. If
               a Party  shall  fail to name an  arbitrator  within ten (10) days
               from such  demand,  then the  arbitrator  for that Party shall be
               appointed by any Justice of the Court of Queen's Bench of Alberta
               upon application by the other Party. If the two arbitrators shall
               fail  within ten (10) days from their  appointment  to agree upon
               and  appoint  the third  arbitrator,  then such third  arbitrator
               shall be appointed  by any Justice of the Court of Queen's  Bench
               of Alberta upon request of either Party.

         (2)   The arbitrator or arbitrators  selected to act hereunder shall be
               qualified by education,  experience and training to pass upon the
               particular question in dispute.

         (3)   The arbitrator or arbitrators  chosen as aforesaid  shall proceed
               immediately  to hear and  determine  the question or questions in
               dispute.  The  decision  of the single  arbitrator  shall be made
               within forty-five (45) days after his or her appointment, subject
               to any reasonable  delay due to unforeseen  circumstances.  Where
               there are three arbitrators,  the decision of the arbitrators, or
               a majority  of them,  shall be made within  forty-five  (45) days
               after the  appointment  of the third  arbitrator,  subject to any
               reasonable  delay due to unforeseen  circumstances.  In the event
               the single arbitrator or the arbitrators,  or a majority of them,
               fail to make a decision within the period herein prescribed, then
               either  Party  may  elect  to  have a new  single  arbitrator  or
               arbitrators  chosen in the manner herein  prescribed,  as if none
               had previously been selected.

         (4)   The  decision  of the single  arbitrator  or the  decision of the
               arbitrators,  or a majority of them, shall be drawn up in writing
               and signed by the single  arbitrator or by the arbitrators,  or a
               majority of them, and shall be final and binding upon the parties
               hereto.

         (5)   The liability  between the Parties  hereto for the payment of the
               compensation  and  expenses  of  the  single  arbitrator  or  the
               arbitrators shall be determined by the arbitrator or arbitrators,
               as the case may be.

                                       55


         (6)   Arbitration pursuant hereto shall be governed in all respects not
               addressed  herein  by  the  provisions  of  the  Arbitration  Act
               (Alberta) and regulations thereunder.

                                   ARTICLE 15
                                     GENERAL

15.1     Further Assurances

         Each Party shall from time to time and without further consideration
execute and deliver all such further documents and instruments and do all acts
and things as the other Party may, either before or after the Closing Date,
reasonably require to effectively carry out or better evidence or perfect the
full intent and meaning of this Agreement.

15.2     Time of the Essence

         Time shall be of the essence of this Agreement.

15.3     Cooperation

         The Seller shall cause the Companies to do all of the things which it
is stated in this Agreement that the Companies shall do at or prior to Closing.
The Purchaser shall cause the Companies to do all things which it is stated in
this Agreement that the Companies shall do following Closing.

15.4     Expenses

         Each Party shall pay its costs and expenses incurred in connection with
the preparation, execution and delivery of this Agreement and all documents and
instruments executed pursuant hereto.

15.5     Public Announcements

         Until Closing has occurred, no public announcement or press release
concerning the sale and purchase of the Shares shall be made by a Party or its
Affiliates without the prior written consent and joint approval of the other
Party, which consent and approval shall not be unreasonably withheld or delayed;
provided that nothing contained herein shall prevent either Party at any time
furnishing any information to any governmental agency or regulatory authority
(including applicable stock exchanges) or to the public if required by
Applicable Law or the rules of a stock exchange.

15.6     Benefit of the Agreement

         This Agreement shall enure to the benefit of and be binding upon the
respective heirs, executors, administrators, successors and permitted assigns of
the Parties. No Person other than the Parties and their successors and permitted
assigns shall be entitled to any rights or benefits hereunder.

                                       56


15.7     Entire Agreement

         This Agreement and the Confidentiality Agreement constitute the entire
agreement between the Parties with respect to the subject matter hereof and
cancels and supersedes any prior understandings and agreements (other than the
Confidentiality Agreement) between the Parties hereto with respect to the
subject matter hereof, including without limitation, any letter agreements
between the Purchaser, the Seller and/or the Companies. Following Closing, the
Purchaser shall be released from all obligations under the Confidentiality
Agreement, other than obligations in respect of acts or omissions by the
Purchaser and/or its representatives prior to Closing.

15.8     Amendments and Waiver

         No modification of or amendment to this Agreement shall be valid or
binding unless set forth in writing and duly executed by both Parties and no
waiver of any breach of any term or provisions of this Agreement shall be
effective or binding unless made in writing and signed by the Party purporting
to give the same and, unless otherwise provided, shall be limited to the
specific breach waived. No failure on the part of any Party in exercising any
right or remedy hereunder shall operate as a waiver thereof, nor shall any
single or partial exercise of any such right or remedy preclude any other or
further exercise thereof or the exercise of any other right or remedy in law or
in equity or by statute or otherwise conferred.

15.9     Assignment

         This Agreement may not be assigned by a Party without the written
consent of the other Party.

15.10    Notices

         Any demand, notice or other communication (collectively, a "notice")
given in connection with this Agreement shall be given in writing and shall be
given by personal delivery, by registered mail or by facsimile addressed to the
recipient as follows:

         To the Seller:

         Abraxas Petroleum Corporation
         500 N. Loop 1604 East, Suite 100
         San Antonio, Texas 78232
         P.O. Box 701007 San Antonio, Texas 78270-1007
         Attention:        Robert L.G. Watson, President
         Fax:              (210) 490-8816


                                       57


         To the Purchaser:

         PrimeWest Gas Inc.
         47th Floor, 150 - 6th Avenue S.W.
         Calgary, Alberta
         T2P 3Y7
         Attention:        Vice-President, Business Development
         Fax:              (403) 699-7411

         To PEI:

         PrimeWest Energy Inc.
         47th Floor, 150 - 6th Avenue S.W.
         Calgary, Alberta
         T2P 3Y7
         Attention:        Vice-President, Business Development
         Fax:              (403) 699-7411

         or to such other address, individual or facsimile number as may be
designated by notice given by the Seller to the Purchaser or by the Purchaser to
the Seller. A notice given by personal delivery shall be conclusively deemed to
have been given on the day of actual delivery thereof, provided that a notice
will not be given by personal delivery except during normal business hours on a
Business Day. Any notice given by registered mail shall be conclusively deemed
to have been given on the day of actual receipt thereof. Any notice given by
facsimile shall be conclusively deemed to have been given on the day of
transmittal thereof if given during normal business hours on a Business Day and
otherwise on the next Business Day thereafter. If the Party giving any notice
knows or ought reasonably to know of any difficulties with the postal system
which might affect the delivery of mail, any such notice shall not be mailed but
shall be given by personal delivery or by facsimile.

15.11    Change of Companies' Names

         It is the intention of the Seller to change the names of the Companies
to a name including their respective Alberta identification numbers. However,
should that not be completed prior to Closing, within thirty (30) days following
Closing, the Purchaser shall change the name of the Companies to eliminate the
words "Grey Wolf" or "Abraxas", and all similar words, initials and symbols
therefrom. Promptly following Closing but in any case not later than ninety (90)
days following Closing, the Purchaser shall change all signs on the Companies'
properties to remove the words "Grey Wolf" or "Abraxas" therefrom and shall not
use and shall not own the Companies' or Abraxas' name, logos, symbols or
initials. Except for the matters referred to in the preceding provisions of this
Section, following the Closing, none of the Companies nor the Purchaser shall
use or have right to use the words "Abraxas" or "Grey Wolf", or similar words,
initials or symbols. Abraxas retains all rights to the names "Abraxas" and "Grey
Wolf" and all variations and derivations thereof.

15.12    Governing Law

         This Agreement shall be governed by and construed in accordance with
the laws of the Province of Alberta and the federal laws of Canada applicable
therein, excluding the conflict of laws rules that might apply the laws of

                                       58


another jurisdiction, and the venue for the settlement of all disputes shall be
in Calgary, Alberta.

15.13    No Duplication of Adjustments

         The Parties agree that the liability and adjustment provisions herein
shall be interpreted such that there shall be no duplication of payment made by
a Party in respect of any adjustment or liability.

15.14    Interest

         An amount payable by a Party after Closing which is not paid within
fifteen (15) days of a written request for payment from the other Party, shall
bear interest at the Prime Rate plus one (1%) percent per annum payable by the
paying Party to the other Party from the end of such fifteen (15) day period
until the amount is paid.

15.15    PrimeWest Energy Inc. Guarantee

         PEI hereby unconditionally and irrevocably guarantees the performance
of all covenants and obligations of the Purchaser in this Agreement. PEI waives
diligence, presentment, demand of payment, any right to require to proceeding
first against the Purchaser, protest, notice and all demands whatsoever. PEI
agrees that this guarantee will not be discharged except by complete performance
of the covenants and obligations of the Purchaser under this Agreement. PEI
shall be directly liable as principal obligor and, upon giving notice of breach
or failure to the Purchaser, neither the Seller nor the Companies shall be under
any obligation to first pursue or exhaust any or all of its recourse and
remedies against the Purchaser.


                                       59


15.16    Counterpart Execution

         Unless otherwise specified herein, this Agreement may be executed in as
many counterparts as are necessary and all executed counterparts together shall
constitute one agreement.

         IN WITNESS WHEREOF the Parties have executed this Agreement.

ABRAXAS PETROLEUM CORPORATION             GREY WOLF EXPLORATION INC.
      By:                                   By:
        -----------------------------        -------------------------------
        Name:    Robert L.G. Watson          Name: Robert L.G. Watson
        Title: President & CEO               Title: President & CEO

CANADIAN ABRAXAS PETROLEUM LIMITED        PRIMEWEST GAS INC.
      By:                                    By:
        -----------------------------         ------------------------------
        Name: Robert L.G. Watson              Name: Donald A. Garner
        Title: President & CEO                Title: President & COO

                                             By:
                                              -------------------------------
                                            Name: Ronald J. Ambrozy
                                            Title: Vice President, Business Dev.

                                           PRIMEWEST ENERGY INC.
                                              By:
                                               ------------------------------
                                              Name:    Donald A. Garner
                                              Title:   President & COO

                                              By:
                                               --------------------------------
                                             Name:    Ronald J. Ambrozy
                                             Title:Vice President, Business Dev.