ST MARY LAND & EXPLORATION CO
8-K, 1996-07-15
CRUDE PETROLEUM & NATURAL GAS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                                                      


                                    FORM 8-K

                                 CURRENT REPORT

                PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
                              EXCHANGE ACT OF 1934

                                  June 28, 1996



                                                      



                         Commission File Number 0-20872

                       ST. MARY LAND & EXPLORATION COMPANY
             (Exact name of Registrant as specified in its charter)




               Delaware                                41-0518430
        (State or other Jurisdiction      (I.R.S. Employer Identification No.)
      of incorporation or organization)




             1776 Lincoln Street, Suite 1100, Denver, Colorado 80203
               (Address of principal executive offices) (Zip Code)




                                 (303) 861-8140
              (Registrant's telephone number, including area code)








<PAGE>
ITEM 2. ACQUISITION OR DISPOSITION OF ASSETS.

On June 28,  1996,  St.  Mary  Land &  Exploration  Company  (the  "Registrant")
purchased  a 90 percent  interest  in certain of the assets of Siete Oil and Gas
Company for a net price of approximately $9.8 million.  The acquisition includes
approximately  150 wells in southeast New Mexico and West Texas  producing  from
the Yates/Queen and Delaware sands at depths of between 3,500 to 5,000 feet. The
acquired  reserves are  approximately  80 percent oil and have a reserve life of
about 15 years. St. Mary's 90 percent interest equates to current  production of
approximately  770 MCFD and 345 BOPD. This acquisition was financed by available
credit under its revolving bank credit agreement with NationsBank.


ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.

    (a)  Financial Statements.

    As of the  date of  filing  of  this  Current  Report  on  Form  8-K,  it is
    impracticable  for  the  Registrant  to  provide  the  financial  statements
    required by this Item 7(a).  In  accordance  with Item  7(a)(4) of Form 8-K,
    such  financial  statements  shall be filed by amendment to this Form 8-K no
    later than 60 days after July 15, 1996.

    (b)  Pro Forma Financial Information.

    As of the  date of  filing  of  this  Current  Report  on  Form  8-K,  it is
    impracticable  for  the  Registrant  to  provide  the  pro  forma  financial
    information required by this Item 7(b). In accordance with Item 7(b) of Form
    8-K, such financial  statements shall be filed by amendment to this Form 8-K
    no later than 60 days after July 15, 1996.

    (c) Exhibit.

    The Purchase and Sale Agreement between the Registrant and Siete Oil and Gas
    is attached hereto as Exhibit 10.42.




<PAGE>



                                   SIGNATURES


         Pursuant to the  requirements  of the  Securities  and  Exchange Act of
1934,  the  Registrant has duly caused this report to be signed on its behalf by
the undersigned thereunto duly authorized.

                                      St. Mary Land & Exploration Company



July 15, 1996                         By  /S/  MARK A. HELLERSTEIN
                                          ------------------------
                                          Mark A. Hellerstein
                                          President and Chief Executive Officer


July 15, 1996                         By  /S/  RICHARD C. NORRIS
                                          ----------------------
                                          Richard C. Norris
                                          Vice President - Accounting and
                                          Administration and Chief Accounting
                                          Officer



<PAGE>
EXHIBIT 10.42

                           PURCHASE AND SALE AGREEMENT

      For and in  consideration  of the sum of $100.00,  the mutual promises set
forth herein, together with other good and valuable  consideration,  the receipt
and  sufficiency  of which  are  hereby  acknowledged,  this  Purchase  and Sale
Agreement  ("this  Agreement") is entered into on  April 2,  1996, by
SIETE  OIL & GAS  CORPORATION  and  OLYMPIC  TRADING  AND  TRANSPORTATION,  INC.
("Seller") and ST. MARY LAND & EXPLORATION  COMPANY,  1776 Lincoln Street, Suite
1100, Denver, Colorado 80203 ("St. Mary") and RIVERHILL ENERGY CORPORATION,  200
North Loraine, Suite 700, P.O. Box 2726, Midland, Texas 79702-2726 ("Riverhill")
in the respective  percentages of 90% and 10%, and who are collectively referred
to herein as ("Purchaser").

      1.    Effective Date.  The purchase and sale contemplated by this 
Agreement shall be effective as of January 1, 1996, at 7:00 a.m. Mountain 
Standard Time (the "Effective Date").

      2.    Property.  As used in this Agreement, the "Property" shall refer to
all of Seller's right, title and interest in, to and under, or derived from, or
allocable or attributable to, the following:

            (a) the oil and gas leases, or oil, gas and mineral leases described
      in Exhibit A attached to this  Agreement  (the "Leases") and all interests
      therein or thereunder,  including,  but not limited to, operating  rights,
      working interests,  leasehold interests, the rights of the original lessee
      thereunder, overriding royalty interests, production payments, net profits
      interests,  other payments out of production,  carried interests,  and net
      revenue interests, insofar and only insofar as the Leases cover, affect or
      pertain to the land and the  depths or  formations  therein or  thereunder
      specifically  described  in Exhibit "A"  attached to this  Agreement  (the
      "Land");

            (b) all right,  title,  and interest  now or  hereafter  acquired by
      Seller  (which  term  shall  not be deemed to  include  the  shareholders,
      directors,  officers,  or  employees  of Seller) in the oil, gas and other
      wells  (the  "Wells")  and  units  together  with the  respective  working
      interest  and net revenue  interest for each of the Wells all as described
      in Exhibit A-1;

            (c) all other  interests  in the Land,  if any,  including,  but not
      limited to, interests in oil, gas and other minerals of any kind or nature
      whatsoever  in and under or which may be produced  from the Land,  mineral
      interests,   royalty  interests,   nonparticipating   mineral  or  royalty
      interests, and reversionary interests, and including all interests in oil,
      gas, or other minerals produced,  from the Wells or otherwise attributable
      to the  Leases or Lands on or after the  Effective  Date,  and all  rents,
      issues, profits,  proceeds,  products,  revenues, and other income from or
      attributable to the Property;

            (d) all of the  presently  existing  and valid  unit or  unitization
      agreements,  communitization  or  pooling  agreements,  and the  units and
      communitized or pooled areas or units created thereby (including,  but not
      limited to, all units and  communitized  or pooled  areas or units  formed
      under orders, regulations, rules or other official acts of any


<PAGE>



      federal or state governmental agency having  jurisdiction) which affect or
      relate to the Land, or the Leases  insofar as they pertain to the Land, or
      which affect or relate to the production  therefrom or derived  therefrom,
      or the production allocable or attributable thereto;

            (e) all of the presently  existing and valid  operating  agreements,
      farmout agreements,  farm-in agreements,  assignments,  agreements for the
      sale or  purchase  of oil,  gas,  casinghead  gas,  or  other  hydrocarbon
      substances,  processing  agreements,  gathering  agreements,   compression
      agreements,  transportation  agreements,  dry hole, bottom hole or acreage
      contribution  agreements,  area of mutual interest agreements,  salt water
      disposal  agreements,   servicing  contracts,  and  all  other  contracts,
      agreements,  assignments,  conveyances  and  instruments  which  affect or
      relate to the Land, or the Leases  insofar as they pertain to the Land, or
      which affect or relate to the production  therefrom or derived  therefrom,
      or the production allocable or attributable thereto;

            (f) all surface leases, rights-of-way, easements, permits, licenses,
      servitudes  and all other  surface  rights and interests  appurtenant  to,
      pertaining to or affecting the Land, or the Leases insofar as they pertain
      to the Land,  or the  production  therefrom or derived  therefrom,  or the
      production allocable or attributable thereto;

            (g) all  property,  fixtures,  equipment,  appurtenances  and  other
      property which is situated upon, appurtenant to, affixed or incidental to,
      or is used in connection  with,  the Land,  or the Leases  insofar as they
      pertain to the Land, together with any and all property, real or personal,
      now or hereafter  acquired and situated  upon,  or used,  held for use, or
      useful in connection with the exploration, development or operation of the
      Land, or the Leases  insofar as they pertain to the Land, or in connection
      with the production,  treating, storing, transporting or marketing of oil,
      gas and other hydrocarbon substances or other minerals produced therefrom,
      derived therefrom,  or allocable or attributable thereto,  including,  but
      not  limited  to, all wells,  buildings,  structures,  separators,  pumps,
      gathering systems,  tanks, tank batteries,  valves,  fittings,  machinery,
      parts, engines, boilers, meters, apparatus, appliances, tools, implements,
      cables,  wires,  towers,  casing,  tubing, rods, pipes,  pipelines,  power
      lines,  water  lines,  flow  lines,  and  all  additions,   substitutions,
      replacements,  accessions  and  attachments  to or for  any and all of the
      foregoing.  In addition  this  transfer of personal  property and fixtures
      shall include any and all furniture, office supplies, and office equipment
      located in the Roswell, New Mexico office,  together with any field office
      or site of  Seller,  together  with all oil wells,  gas  wells,  injection
      wells, or other wells,  buildings,  structures,  equipment,  camps,  motor
      vehicles, and all field equipment, including all rights-of-way,  easements
      and servitudes, together with all additions, substitutions,  replacements,
      accessions, and attachments to any and all of the foregoing properties;

            (h) all books, records, reports, manuals, files, and title documents
      relating to the Property, including correspondence, records of production,
      maintenance,  revenue,  sales,  expenses,  warranties,  lease files,  land
      files,  well files,  division  order  files,  abstracts,  title  opinions,
      assignments, maps, engineering, geological, and subject to any

<PAGE>




      applicable  licensing  or  confidentiality   agreement,   all  geophysical
      information,  material and data, together with other files, contracts, and
      records and data of Seller  relating to the  Property  and  including  all
      interpretative   maps  of  any  kind  or  character,   whether  originals,
      reproductions, microfilm, or computer records, and wherever located.

      3.    Purchase and Sale.  Seller agrees to sell and convey to Purchaser,
and Purchaser agrees to purchase from Seller, the Property, in accordance with,
and subject to the provisions of this Agreement.

      4.  Purchase  Price.  The total cash  purchase  price for the  Property is
$12,400,000.00  ("the Purchase Price"). In Exhibit A attached to this Agreement,
the  Property is divided or grouped into  separate  parcels,  tracts,  groups or
descriptions.  The Purchase  Price shall be allocated  among the Property in the
manner  set forth in  Exhibit B attached  to this  Agreement.  The value of each
portion of the  Property  as  reflected  in Exhibit B shall be referred to as an
"Allocated Value".  This allocation shall be for the purposes of Sections 13 and
14 of this  Agreement  only,  and  Purchaser  retains  the  right to  internally
allocate values for equipment,  property,  and production in conformity with its
own  accounting  and  allocation  purposes.  The Purchase Price shall be paid by
Purchaser to Seller at closing,  subject to applicable  adjustments provided for
in this  Agreement.  Payment  shall  be made in the form of a wire  transfer  of
immediately  available funds to an account or accounts as directed by Seller and
in compliance with Sections 10 and 20. hereof.

      5.  Earnest  Money.  Upon the  execution  of this  Agreement by Seller and
Purchaser,  Purchaser  shall  deliver to the Escrow  Agent (as defined  below in
Section 20) the sum of  $500,000.00  as an earnest  money  deposit ("the Earnest
Money").  The Earnest Money shall be delivered in the form of a Cashier's  Check
or by wire transfer of immediately  available funds to an account or accounts as
directed by Escrow Agent. The Earnest Money shall be held by the Escrow Agent in
an  interest-bearing   account,  subject  to  the  further  provisions  of  this
Agreement.  Except as  specifically  provided in this  Agreement,  and until all
applicable conditions have been fulfilled and closing has occurred, Seller shall
have no right or title to, or interest  in, the Earnest  Money.  If closing does
not  occur  and  if  Purchaser  is  not  in  material   breach  of  any  of  its
representations,  covenants or  warranties,  the Earnest Money shall be promptly
returned to Purchaser.

       6.   Condition of Property.  Seller makes no warranties or 
representations whatsoever regarding the condition, quality or fitness of any of
the Property.  Purchaser represents and acknowledges that it is purchasing the 
Property as is.  SELLER DISCLAIMS ANY AND ALL IMPLIED WARRANTIES OF 
MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE.

<PAGE>




      Purchaser  acknowledges  that  it has  been  cautioned  that  oil  and gas
producing  formations  may contain  naturally  occurring  radioactive  materials
("NORM").  Purchaser  further  acknowledges  that  it has  been  cautioned  that
production  activities may result in the concentration of certain levels of NORM
or man made material fibers ("MMF") on production facilities, equipment and pipe
so that a health  hazard may exist in connection  with the removal,  handling or
disposal of such NORM or MMF  contaminated  facilities,  equipment  or pipe,  if
proper  environmental,  regulatory  or  industrial  hygiene  procedures  are not
observed. Purchaser further acknowledges and agrees that the presence of NORM or
MMF in or on  facilities,  equipment  or pipe  comprising a part of the Property
shall be the sole responsibility of Purchaser from and after the Effective Date.

       7.  Representations  of Seller.  The  express  representations  of Seller
contained in this paragraph or otherwise  stated in this Agreement are exclusive
and are in lieu of all other representations and warranties,  express,  implied,
statutory,  or  otherwise,  are  based  only  upon  Seller's  best  information,
knowledge,  or  belief,  and,  are made  without  any  warranty  whatsoever.  In
addition,  the sole remedy for any breach of any  representation of Seller shall
be in the manner set forth in Sections 13 and 16 of this  Agreement,  and breach
of any  representation  or covenant  contained herein shall not give rise to any
other claim or cause of action  against Seller or its  shareholders,  directors,
officers,  or employees,  except that  Purchaser does not waive any right it may
have to assert any claim based on actual fraud or intentional  tort.  Subject to
the foregoing,  Seller represents, but does not warrant, that, as of the date of
this Agreement, to the best of its knowledge, information and belief:

            (a) Each Seller is a corporation,  duly organized,  validly existing
      and in  good  standing  under  the  laws  of New  Mexico  and is  properly
      qualified  to do business in the State of New Mexico,  and Siete Oil & Gas
      Corporation is properly qualified to do business in the State of Texas;

            (b) Seller has the  requisite  power and  authority  to carry on its
      business as presently  conducted and has the requisite power and authority
      to enter  into and  perform  its  obligations  under this  Agreement;  the
      consummation of the  transactions  contemplated by this Agreement will not
      conflict  with, or result in a violation or breach of, or give rise to any
      rights of acceleration or any default under the Articles of  Incorporation
      or  Bylaws  of  Seller,  or  any  provision  of any  mortgage,  indenture,
      contract,  material  agreement  or other  instrument  to which Seller is a
      party or by which any of its  material  assets are bound or any  judgment,
      decree,  order,  statute,  rule or  regulation  applicable to Seller or to
      which any material portion of their  respective  properties and assets are
      subject;

            (c) Upon the  approval  of the Board of  Directors  of  Seller,  the
      execution  and delivery of this  Agreement  will be, and the execution and
      delivery of all  certificates,  documents and  instruments  required to be
      executed and delivered by Seller at the closing,  and the  consummation of
      the  transactions  contemplated  hereby as of the Effective  Date will be,
      duly authorized by all necessary action.

<PAGE>





            (d) Upon the  approval  by the Board of  Directors  of Seller,  this
      Agreement  will be duly and validly  executed and  delivered by Seller and
      will  constitute  a  legal,   valid  and  binding   obligation  of  Seller
      enforceable against it in accordance with its terms, subject,  however, to
      the effects of  bankruptcy,  insolvency,  reorganization,  moratorium  and
      similar laws as well as to general principles of equity;

            (e)  Except as set forth in  Exhibit C hereto,  no  action,  suit or
      proceeding  is pending  or  threatened  before  any court or  governmental
      agency or arbitral  body which might have a material  adverse  effect with
      respect to the Property or which seeks to  invalidate,  enjoin or restrain
      the  consummation of the  transactions  contemplated  hereby or any action
      taken or to be taken in connection therewith;

            (f) Subject to the further provisions of this paragraph, each of the
      production  and  expense  data and  computer  printouts  or other  data or
      documentation in any form or medium  heretofore  furnished or caused to be
      furnished by Seller to Purchaser (the  "Information"),  and any supplement
      thereto,  was complete and the Information  reported therein correct as of
      the date of such delivery, and the Information, as of its respective dates
      and of the  respective  dates of its delivery,  did not contain a material
      misstatement of fact regarding the matters  described  therein and did not
      omit to state  therein a material  fact  necessary to make the  statements
      therein not  misleading,  in light of the  circumstances  under which they
      were made.  Except as set forth in this Agreement,  no  representation  or
      warranty  of any  kind is made by  Seller  as to the  Information  or with
      respect to the  interests to which the  Information  relates and Purchaser
      expressly agrees that any conclusions  drawn therefrom shall be the result
      of its own independent review and judgment. The representations  contained
      in this paragraph shall apply only to matters of fact, and shall not apply
      to  any  information,   data,  printouts,   extrapolations,   projections,
      documentation,  maps,  graphs,  charts,  or tables which reflect,  depict,
      present,  portray, or represent,  or which are based upon or derived from,
      in whole or in part, matters of interpretation  including, but not limited
      to,  matters  of  geological,  geophysical,   engineering,  or  scientific
      interpretation.  Seller makes no warranty,  and,  except as expressly  set
      forth in this  paragraph  (f),  Seller makes no  representation,  express,
      implied, statutory or otherwise, as to the accuracy or completeness of any
      data,  reports,  records,  projections,   information  or  materials  now,
      heretofore  or hereafter  furnished or made  available  to  Purchaser,  in
      connection  with  this  Agreement  including,   without  limitation,   any
      description of the Property,  pricing assumptions,  or quality or quantity
      of  hydrocarbon  reserves  (if any)  attributable  to the  Property or the
      ability or potential of the Property to produce  hydrocarbons or any other
      matters contained in the proprietary data or any other materials furnished
      or made  available  to  Purchaser  by  Seller  or by  Seller's  agents  or
      representatives.  Any and all such data,  records,  reports,  projections,
      information  and other  materials  furnished by Seller or  otherwise  made
      available to Purchaser  are  provided to Purchaser as a  convenience,  and
      shall not create or give rise

<PAGE>




      to any  liability  of or  against  Seller  except  as may be set  forth in
      Sections 13 and 16 of this  Agreement.  Any reliance on or use of the same
      shall be at the Purchaser's  sole risk to the maximum extent  permitted by
      law.

            (g) Seller has not incurred any obligation or liability,  contingent
      or otherwise, for brokers' or finders' fees in respect of the transactions
      contemplated  by this Agreement other than a fee which Seller shall pay to
      Chemical Securities Inc., Houston, Texas, at or before the closing;

            (h) All ad  valorem,  property,  production,  severance  and similar
      taxes and assessments  (including  applicable  penalties and interest,  if
      any) based on or measured by the  ownership of property or the  production
      of hydrocarbons  or the receipt of proceeds  therefrom with respect to the
      Property for all periods  prior to the  Effective  Date have been properly
      paid or at or  prior  to  closing  will be paid  and all  such  taxes  and
      assessments which must be paid prior to the closing shall be properly paid
      by Seller;

            (i) All royalties,  rentals and other payments (including any due by
      virtue of any take or pay or other gas contract  settlement) due by Seller
      under all Leases have been  properly  and timely  paid and all  conditions
      necessary to keep the same in force have been fully performed;

            (j) Seller is not obligated by virtue of any prepayment  arrangement
      under any contract for the sale of  hydrocarbons,  including "take or pay"
      obligation,  imbalance of production or similar provisions or a production
      payment or any other arrangement to deliver hydrocarbons from the Property
      at some future time  without  then or  thereafter  receiving  full payment
      therefor;

            (k) Seller has all  material  governmental  licenses and permits and
      has properly made all material filings, necessary or appropriate to obtain
      such  licenses  and permits to own and operate the  Property as  presently
      being owned and operated,  and such  licenses,  permits and filings are in
      full force and effect, and no material  violations exist in respect of any
      such licenses,  permits or filings, no proceeding is pending or threatened
      looking  toward the  challenging,  revocation  or  limitation  of any such
      licenses,  permits or filings;  and Seller has  complied  in all  material
      respects with all laws, rules,  regulations,  ordinances,  codes,  orders,
      licenses, concessions and permits relating to any of the Property;

             (l) Seller has not sold, nor permitted to be sold, any hydrocarbons
      in violation of any law, ordinance,  rule or regulation  pertaining to the
      pricing, production, conservation or allocation of hydrocarbons;

<PAGE>




             (m) All of the wells in which  Seller has an  interest by virtue of
      its  respective  ownership of the Property have been drilled and completed
      within the  boundaries  of such  Property  or within the limits  otherwise
      permitted  by  contract,  pooling or unit  agreement,  and by law, and all
      drilling and  completion  of the wells  included in the Property have been
      conducted in material  compliance  with all applicable  laws,  ordinances,
      rules,  regulations and permits, and judgments,  orders and decrees of any
      court,  tribal or governmental body or agency, and no well included on the
      Property is subject to material  penalties  or  allowables  after the date
      hereof because of any  overproduction or any other violation of applicable
      laws, rules, regulations or permits or judgments, orders or decrees of any
      court or  governmental  body or agency which would  prevent such well from
      being entitled to its full legal and regular  allowable from and after the
      date hereof as prescribed by any court or governmental body or agency;

             (n)  Seller is not a "public utility holding company" as defined in
      the Public Utility Holding Company Act of 1935, as amended;

             (o)  Seller  has not  received  any  pending  claims  of  defaults,
      offsets, or cancellations from any lessors with respect to the Leases, and
      each of the  Leases is in full  force and  effect in  accordance  with its
      terms;

             (p)  Except as set forth on  Exhibit F  attached  hereto and made a
      part  hereof,  there are no gas  balancing  obligations  or makeup  rights
      relating to the Property;

             (q) Except as set forth on the attached Exhibits A and A-1 attached
      hereto and made a part hereof,  the Property is not subject to any back-in
      arrangements  which will  diminish the interests set forth on the attached
      Exhibits A and A-1;

             (r) There are no  surface  use or access  agreements  currently  in
      force  and  effect  that  would  materially  interfere  with  oil  and gas
      operations on the Leases;

             (s) Except as  specifically  set forth on Exhibit G attached hereto
      and made a part hereof, none of the Wells included within the Property has
      been plugged and abandoned subsequent to the Effective Date;

             (t) Either  Seller  has  acquired,  or will  acquire at or prior to
      closing,  any and all overriding  royalty  interests and any right to such
      overriding  royalty  interests  previously  conveyed to Chemical  Bank, or
      Chemical Bank will convey such overriding  royalty  interests  directly to
      Purchaser at or prior to closing,  and the net revenue interests set forth
      on the  attached  Exhibit  A-1 reflect the  inclusion  of such  overriding
      royalty interests.

<PAGE>




             (u)  Environmental Matters.

                  (i) Without  limiting the generality or  applicability  of any
            other  provision of this  Agreement,  oil and gas  activities on the
            Property do not violate any applicable  Federal,  state,  local,  or
            tribal  law  (including  common  law),  ordinance,  rule,  standard,
            prohibition,  or regulation  relating to the environment  including,
            without  limitation,   the  Comprehensive   Environmental  Response,
            Compensation  and Liability  Act 42 U.S.C.  9601 et seq., as amended
            ("CERCLA"),  the Resource  Conservation  and Recovery Act, the Clean
            Air Act, the Clean Water Act and the Safe Drinking Water Act, or any
            comparable,   applicable  Texas  or  New  Mexico  statute,  rule  or
            regulation  (collectively  "Environmental  Laws"). Seller has timely
            filed all required  reports,  obtained all  required  approvals  and
            permits,   and  generated   and   maintained   all  required   data,
            documentation and records under any applicable Environmental Laws.

                  (ii) There has not been, and is not  occurring,  any discharge
            or release of any "Hazardous Substances" in, on or around any of the
            Property  operated  by the  Seller in  violation  of any  applicable
            Environmental Laws and in amounts or concentrations which reasonably
            could  be  expected  to give  rise  to  liabilities  or  obligations
            exceeding  $15,000  in any  instance,  or  exceeding  $75,000 in the
            aggregate,  net to Seller's interest in the affected  property.  For
            purposes of this Agreement,  the term "Hazardous  Substances"  shall
            mean any  material  regulated  or  addressed  under  any  applicable
            Environmental Law.

                  (iii) Seller has not sent Hazardous Substances to a site which
            pursuant to CERCLA or any similar  state law has been placed,  or is
            proposed to be placed, on the "National  Priority List" of hazardous
            waste sites or which is subject to a claim, an administrative  order
            or other request to take any cleanup, removal, or remedial action or
            to pay for any costs relating to such site.

                  (iv)  There is no  existing  naturally  occurring  radioactive
            material (NORM) within the Property  exceeding  standards imposed by
            applicable Environmental Laws.

                  (v) There are no  pending or  threatened  claims nor any basis
            for claims against Seller relating to the Property under  applicable
            Environmental Laws.

                  (vi) Seller has not constructed,  placed,  deposited,  stored,
            disposed  of  nor  located  on  the  Property  any   polychlorinated
            biphenyls (PCBs) nor  transformers,  compressors nor other equipment
            which  contains  PCBs,  to the  extent  that  the  same  would  be a
            violation of any applicable Environmental Laws.

<PAGE>





            (v) Except as set forth on Exhibit H attached hereto and made a part
      hereof, there are no forward sales, or price hedging arrangements in place
      and affecting the Property;

             (w) To the extent  required by, and in accordance  with,  rules and
      regulations  of the  Texas  Railroad  Commission  or the  New  Mexico  Oil
      Conservation  Commission and other  applicable laws, rules and regulations
      and other obligations imposed upon Seller by contract, Seller has properly
      plugged and abandoned all wells, including,  but not limited to salt water
      disposal  wells,  which wells were  located on the Leases or lands  pooled
      therewith  and which were  plugged and  abandoned  prior to the  Effective
      Date.  Further,  Seller has paid the costs of all plugging and abandonment
      of wells,  all removal of facilities,  equipment,  and pipelines,  and all
      restoration of lands or water  bottoms,  performed by third parties on any
      wells,  facilities,  equipment  or  pipelines  located on the Leases or on
      lands or water  bottoms  pooled or unitized  therewith  to the extent that
      such operations were conducted prior to the Effective Date;

             (x) Prior to the Effective Date, and to the extent required by, and
      in accordance with, rules and regulations of the Texas Railroad Commission
      or the New Mexico Oil  Conservation  Commission and other applicable laws,
      rules  and  regulations  and  other  obligations  imposed  upon  Seller by
      contract,  Seller has  restored  associated  or  affected  surface  areas,
      conforming to and  satisfying  the terms and conditions of the said Leases
      and/or  any  agreements,  laws,  orders,  rules,  regulations,  or  permit
      obligations  pertinent  thereto,  to the  extent  that such  actions  were
      required to have been performed by the Effective Date;

            (y) Except as set forth on Exhibit I attached hereto and made a part
      hereof,  the  Property  does not include any  "Inactive  Wells".  The term
      "Inactive  Wells"  shall mean wells which have not been  plugged and which
      are not  currently  (i) being used to produce  oil,  gas,  or  hydrocarbon
      substances,  or (ii)  being used for the  disposal  of salt water or other
      substances,  or (iii)  being  used  for  pressure  maintenance  or for the
      injection of water or other fluids;

       8.         Representations and Warranties of Purchaser.  Purchaser 
represents and warrants to Seller:

            (a) St.  Mary  is  duly  organized,  validly  existing,  and in good
      standing  under  the laws of the  State of  Delaware  and is or will be by
      closing  properly  qualified to do business in the States of Texas and New
      Mexico. Riverhill is duly organized, validly existing and in good standing
      under the laws of the State of Texas and is or will be by closing properly
      qualified to do business in the States of Texas and New Mexico;

            (b) Purchaser has all requisite  power and authority,  corporate and
      otherwise,  to carry on its business as presently conducted, to enter into
      this Agreement, to purchase

<PAGE>




      the Property on the terms  described in this  Agreement and to perform its
      other   obligations   under  this  Agreement.   The  consummation  of  the
      transactions  contemplated  by this Agreement  will not violate,  or be in
      conflict with, any provisions of Purchaser's  Article of  Incorporation or
      Bylaws,  or of  Purchaser's  agreements  or  governing  documents  or  any
      material agreement or instrument to which Purchaser is a party or by which
      it is bound, or any judgment,  decree,  order, statute, rule or regulation
      applicable to Purchaser;

            (c) Upon the approval of the Board of  Directors  of  Purchaser  the
      execution  and delivery of this  Agreement  will be, and the execution and
      delivery of all certificates,  documents,  and instruments  required to be
      executed and delivered by Purchaser at the closing,  and the  consummation
      of the transactions  contemplated  hereby as of the Effective Date will be
      duly authorized by all requisite action;

            (d) Upon the approval of the Board of Directors of  Purchaser,  this
      Agreement  will  constitute  a legal,  valid  and  binding  obligation  of
      Purchaser,  enforceable in accordance with its terms, subject, however, to
      the effects of  bankruptcy,  insolvency,  reorganization,  moratorium  and
      similar laws as well as to general principles of equity;

            (e) To the knowledge of Purchaser,  no action, suit or proceeding is
      pending or threatened before any court or governmental  agency which seeks
      to invalidate,  enjoin or restrain the  consummation  of the  transactions
      contemplated  hereby,  or any  action  taken or to be taken in  connection
      therewith;

            (f)  Purchaser  has  adequate  financial  resources  to make  timely
      payment of the Purchase Price and to pay and perform its other obligations
      hereunder  and all  financial  statements  furnished to Seller  accurately
      reflect Purchaser's current financial position;

            (g) Purchaser  has incurred no  liability,  contingent or otherwise,
      for brokers' or finders' fees relating to the transactions contemplated by
      this Agreement for which Seller shall have any responsibility whatsoever;

            (h) The consummation of the transactions contemplated herein are not
      "prohibited  transactions"  under the Employee  Retirement Income Security
      Act  of  1974  ("ERISA"),   and  the   consummation  of  the  transactions
      contemplated herein will not violate any other provisions of ERISA.

            (i)  Purchaser  is relying  solely  upon its own  inspection  of the
      Property,  and,  except as provided in this  Agreement,  if closing occurs
      Purchaser  shall  accept  all of the same in their  "as  is",  "where  is"
      condition.

<PAGE>




            (j)  Purchaser  warrants  that it is acquiring  the Property for its
      sole account and not for resale,  in whole or part,  to any other  person,
      firm or entity in any manner  that will  violate any  applicable  state or
      federal securities law.

            (k)  Purchaser  expressly  waives the  provisions  of Chapter  XVII,
      Subchapter E, Sections 17.41 through 17.63,  inclusive (other than Section
      17.555, which is not waived), Vernon's Texas Code Annotated,  Business and
      Commerce  Code  (the  "Deceptive  Trade  Practices  Act")  as  well as the
      provisions  of  ss.ss.57-12-1  through  22,  inclusive,  NMSA  (1978) (the
      "Unfair Practices Act");  Purchaser  acknowledges that this express waiver
      shall be  considered  a material  and  integral  part of this sale and the
      consideration  thereof, and acknowledges that this waiver has been brought
      to the attention of Purchaser  and explained in detail and that  Purchaser
      has voluntarily and knowingly consented to this waiver.

            (l) Purchaser  acknowledges  and understands  that the  transactions
      contemplated   by  this   Agreement  are  incident  and  integral  to  the
      liquidation of the assets of the Seller,  the winding up of the affairs of
      the Seller, and the eventual dissolution of the Seller.

       9.   Seller's Covenants.

            (a)  During  the  period  from  the  date of this  Agreement  to the
      closing,  or the  termination  of this  Agreement  pursuant  to the  terms
      hereof,  Seller will exercise its best efforts to cause the Property to be
      developed,  maintained and operated in a prudent and workmanlike manner in
      accordance with standard oil and gas industry practices;

            (b)  During  the  period  from  the  date of this  Agreement  to the
      closing,  or the  termination  of this  Agreement  pursuant  to the  terms
      hereof,  without the prior written  consent of Purchaser,  Seller will not
      (i) abandon or permit the abandonment of any material part of the Property
      (except the abandonment of Leases upon the expiration of their  respective
      primary  terms),  (ii)  commence  any  material  operation on the Property
      requiring an authority for expenditure  under  applicable  joint operating
      agreements  (except emergency  operations,  and operations  required under
      presently  existing  contractual  obligations or commitments  described in
      Exhibit I hereto),  or (iii) convey or dispose of any material part of the
      Property  (other  than  hydrocarbons  produced  from the  Property  in the
      ordinary   course  of  business)   provided,   however,   that   Purchaser
      acknowledges  that  Seller  owns  undivided  interests  in  certain of the
      Property, and Purchaser agrees that the acts or omissions of parties other
      than Seller shall not  constitute a violation  of the  provisions  of this
      Section nor shall any action required by a vote of working interest owners
      other than Seller  constitute such a violation so long as Seller has voted
      its  interest in  compliance  with the express  instructions  of Purchaser
      which instructions shall be delivered to Seller 24 hours prior to any vote
      required of Seller under any applicable operating agreement;

<PAGE>





            (c) Seller shall  promptly  notify  Purchaser  of any suit,  action,
      adverse claim,  or other  proceeding that arises prior to the closing with
      respect to which Seller  receives  actual  notice or otherwise  has actual
      knowledge;

            (d) Seller will promptly  notify  Purchaser of the occurrence of any
      event,  or the  non-occurrence  of any event,  which  would  result in the
      representations  or  covenants  of Seller  herein to be  incorrect  in any
      material respect;

            (e) Seller shall  exercise all due  diligence in  safe-guarding  and
      securely  maintaining all  engineering,  geological and geophysical  data,
      reports and maps,  all other  confidential  information,  in any medium or
      form whatsoever, in the possession of Seller relating to the Property;

            (f) Seller shall cooperate with Purchaser in order to obtain,  prior
      to the closing,  all other necessary consents and waivers, as the case may
      be, of Preferential Rights and similar rights of other parties,  including
      governmental  authorities  and  agencies,  lessors or any other persons or
      entities,  to purchase any portion of the Property or to prohibit the sale
      thereof  to  Purchaser,  and  Seller  further  acknowledges  that prior to
      closing it shall be Seller's obligation to deal with such third parties in
      accordance  with the terms of the  agreement  creating  such  Preferential
      Rights;

            (g)  Seller  shall  use  all  reasonable  efforts  to  maintain  its
      corporate  existence from the date hereof until closing or the termination
      hereof,  and to  assure  that as of the  closing  it will not be under any
      material  corporate,  legal,  or  contractual  restriction  (including the
      filing of a  voluntary  petition  in  bankruptcy  or  voluntarily  seeking
      protection  from its  creditors)  that would  prohibit or delay the timely
      consummation of the transactions contemplated hereby; and

            (h) All  policies  of  insurance  currently  in force and effect and
      pertaining to the Property shall be maintained by Seller in full force and
      effect through closing.

            (i) Seller  agrees to provide to  Purchaser  at or prior to closing,
      assurances that the officers,  directors, and the holders of a majority of
      the outstanding  shares of stock of Siete Oil & Gas Corporation  will vote
      for  Purchaser or its  designee as operator  with regard to any portion of
      the Property  currently being operated by Siete Oil & Gas Corporation,  to
      the extent that said parties have the right to vote on such matter.

       10.  Siete  Liens.  Portions  of the  Property  may be subject to various
mortgages,  deeds of trust, security interests,  statutory lien claims, or other
liens or charges against the Property, which were created by Seller or which are
or may be asserted  specifically  against  Seller and Seller's  interests in the
Property.  Such matters shall be collectively  referred to as the "Siete Liens".
Except as set forth below in this  Section 10, the  existence of any Siete Liens
shall not

<PAGE>




be deemed to be a "Title  Defect",  nor  shall it render  Seller's  title to the
Property less than "Good and Defensible  Title" (as said terms are defined below
in Section 11).  Nevertheless,  the Property shall be conveyed to Purchaser free
and clear of any Siete  Liens.  To the  extent  such  information  is  currently
available,  Exhibit D attached  hereto sets forth the Siete Liens. If it has not
already done so, as soon as possible after execution of this  Agreement,  Seller
shall  obtain  lien  searches  from all  counties  in which any  portion  of the
Property is located,  and will identify all Siete Liens. After the lien searches
have been completed,  Exhibit D shall be supplemented  and updated.  Seller will
contact  and  negotiate  with the  holders of Siete  Liens and will use its best
efforts  toward the end that,  at  closing,  as many of the Siete  Liens will be
released as possible.  For purposes  hereof,  if there exist any Siete Liens the
enforcement of which is barred or precluded by applicable  law, such Siete Liens
shall be deemed to have been  released.  At closing,  the Escrow Agent  (defined
below in Section 20) shall use so much of the Purchase Price as may be necessary
to fully pay and satisfy those holders of Siete Liens who have provided releases
to the Escrow Agent, in accordance with the terms of the settlements  negotiated
by Seller with such holders. If, at closing, there are unreleased or unsatisfied
Siete  Liens the  enforcement  of which  has not been  barred  or  precluded  by
applicable  law, and with respect to which the holders thereof have not provided
releases, then, subject to the further provisions of this Section 10, such Siete
Liens shall be deemed to be "Title  Defects"  (defined below in Section 11), and
shall be resolved in accordance  with Section 13.  Notwithstanding  the previous
sentence,  neither the $100,000 threshhold nor the 10 day notice requirement set
forth below in Section 13 shall apply to Siete Liens.

       11. Title - Due Diligence Review.  For purposes of this Agreement,  "Good
and Defensible  Title" shall mean such title that (i) entitles Seller to receive
and be paid  based  on not less  than the net  revenue  interests  specified  in
Exhibit A-1 to this  Agreement  with  respect to each  parcel,  tract,  group or
description, or with respect to any wells described in connection therewith, and
obligates  Seller to pay  costs  and  expenses  of  operation  not more than the
working interest  specified in Exhibit A-1 (without a proportionate  increase in
the  corresponding  net revenue  interest)  with respect to each parcel,  tract,
group or description,  or with respect to any wells in connection therewith; and
(ii) is free and clear of any and all liens and mortgages  (other than any Siete
Liens)  and  free  and  clear of other  encumbrances  relating  to or  affecting
Seller's title or the title to be conveyed to Purchaser as  contemplated by this
Agreement.  The existence of any "Permitted  Encumbrances" (defined below) shall
not be  deemed  to  render  Seller's  title to the  Property  less than Good and
Defensible Title.

      For purposes of this Agreement,  "Permitted  Encumbrances"  shall mean the
following,  but only to the extent that the following do not reduce Seller's net
revenue interests in the Property below the net revenue  interests  specified in
Exhibit A with respect to each parcel,  tract,  group,  description or well: (i)
lessor's  royalties,  overriding royalty  interests,  production  payments,  net
profits interests,  carried interests,  reversionary interests and other burdens
on

<PAGE>




production;  (ii) unit or unitization agreements,  communitization agreements or
pooling  agreements,  unitization or pooling  designations or declarations,  and
pooling or unitization orders of any federal or state governmental agency having
jurisdiction;  (iii)  operating  agreements,  farmout  agreements,  assignments,
agreements  for the  sale or  purchase  of oil,  gas,  casinghead  gas or  other
hydrocarbon  substances  which have either been  disclosed on Exhibit F or which
provide for payment at not less than that otherwise attainable in the area where
the  production  occurs,  processing  agreements,  salt water or other  disposal
agreements,  seismic or geophysical permits or agreements,  and other agreements
which are  customary in the oil,  gas and mineral  exploration  and  development
business  or in the  business  of  processing  gas  and gas  condensate  for the
extraction of products therefrom;  (iv) preferential rights to purchase,  rights
of first refusal,  and required  third-party consents which are waived, or which
are deemed to be waived, by the time of closing the transaction  contemplated by
this  Agreement;  and (v) all other liens,  charges,  encumbrances,  defects and
irregularities  which do not materially  interfere with the operation,  value or
use of the Property,  including, but not limited to, those which are customarily
acceptable to prudent  operators and interest owners in the area. Such customary
liens, charges,  encumbrances,  defects and irregularities  include, but are not
limited  to,  defects in the early  chain of title such as the failure to recite
marital  status in documents,  omission of  succession or heirship  proceedings,
lack of survey,  defects  that have been cured by  possession  under  applicable
statutes  of  limitation,  and failure to record  releases of liens,  production
payments  or  mortgages  that have  expired by their  terms,  to the extent such
matters are not reasonably expected to result in claims that will materially and
adversely affect Purchaser's title to the Property.

      For purposes of this  Agreement,  "Title  Defect"  shall mean any material
deficiency in one (or more) of the following respects, to-wit:

            (a) Seller's title at the Effective  Date and at closing,  as to one
      or more properties, is subject to an encumbrance,  irregularity, or defect
      in or objection to Seller's title (expressly excluding the Siete Liens and
      the Permitted  Encumbrances) that renders Seller's title to any portion of
      the Property less than Good and Defensible Title;

            (b) Seller owns less than the net revenue  interest shown on Exhibit
      A-1 or is obligated to bear a share of the costs of operation greater than
      the  working  interest  shown  on  Exhibit  A-1  without  a  corresponding
      proportionate increase in net revenue interest;

            (c) Seller's  rights and interests have been or are subject to being
      reduced by virtue of the exercise by a third party reversionary or back-in
      interest,  farm-out of other than wellbore rights,  or other similar right
      not reflected on Exhibit A-1;

<PAGE>




            (d)   Seller is in default under some material provision of any of 
      the Leases, or any of the contracts to which the Leases are subject;

            (e) Seller is in Material Breach of any representations or covenants
      made  herein.  A breach  shall be a Material  Breach if the  liability  or
      diminution  in value  associated  with the matter  affected by such breach
      shall  exceed  $15,000  as to any  single  occurrence,  or  $75,000 in the
      aggregate as to all such events of breach, net to Seller's interest in the
      affected  property.  It is  understood  and agreed by Seller and Purchaser
      these are threshold numbers, not a deductible;

            (f)   Changes in the gas balancing amounts  from  those set out on 
      Exhibit F;

            (g) The  existence of contracts for the sale of oil or gas including
      calls on production,  not shown on Exhibit F and which provide for payment
      at less than that  otherwise  reasonably  attainable in the area where the
      production  occurs.  For  purposes of this  Section,  any  contract  which
      extends for a term greater than thirty (30) days for oil production or one
      (1) year for gas production, or which requires physical payment to be made
      more than thirty (30) days after the month in which the oil is produced or
      sixty  (60) days  after the month in which the gas is  produced,  or which
      provides for prices which are less than that  attainable in the area where
      this production  occurs  inclusive of any bonus or premium  payments which
      are customarily made, shall be considered as providing for payment at less
      than that  otherwise  reasonably  attainable  in the area.  Further,  with
      regard  to  calls  on  production,  if the  effect  of such  call  was not
      reflected on the information furnished in the data room, then such call on
      production shall be deemed a Title Defect.

             (h)  There exists an Environmental Defect or Environmental Defects.

      Immediately  upon  execution of this  Agreement  by Seller and  Purchaser,
Seller  shall  make  available  to  Purchaser  all  files,   records,  data  and
information  of every kind and  character  in  Seller's  possession  or to which
Seller has reasonable access and which directly relate to the Property, but only
to the  extent  that  Seller  may do so  without  violating  any  obligation  of
confidence  or  contractual  commitment  to a third  party.  Purchaser  shall be
permitted to inspect,  examine and review such materials. Any Title Defect which
is not  brought  to the  attention  of Seller in the  manner and within the time
periods set forth in Sections 12 or 13 below shall be deemed to have been waived
by Purchaser.

       12.  Physical and Environmental Inspection. After the execution of this 
Agreement, Purchaser and their authorized representatives shall have physical 
access to the Property at Purchaser's sole cost, risk and expense for the 
purpose of inspecting the Property, conducting

<PAGE>




such tests, examination, investigations and assessments as may be reasonable and
necessary or appropriate to evaluate the environmental  and physical  conditions
of the Property, including the identification of wetlands. For those portions of
the Property which are not operated by Seller, Purchaser shall obtain permission
from the  operator  to  conduct  such  inspections.  Seller  shall  provide  all
reasonable  assistance in obtaining this  permission  for  Purchaser.  Purchaser
shall defend and indemnify  Seller and its  directors,  shareholders,  officers,
employees,  agents,  and  contractors  from any and all liability,  claims,  and
causes  of  action  which  relate  to or  arise  out of  injury  to  Purchaser's
employees,  agents or contractors or to Purchaser's  property,  and/or injury to
Seller's  property,  employees,  agents  or  contractors  which may arise out of
Purchaser's inspections, but only to the extent of Purchaser's negligence or the
negligence of Purchaser's employees, agents, or contractors. Purchaser agrees to
provide  to  Seller,  upon  request,  a copy of any  environmental  assessments,
including any reports, data, and conclusions.  Likewise, Seller shall furnish to
Purchaser a copy of any environmental assessments,  including any reports, data,
and  conclusions  pertaining  to the  Property  in  the  possession  of  Seller.
Purchaser and Seller shall keep any and all data or information  acquired by all
such  examinations  and  results of all  analysis  of such data and  information
strictly  confidential and not disclose same to any person or agency without the
prior written approval of both Purchaser and Seller. The foregoing obligation of
confidentiality  shall survive closing or termination of this Agreement  without
closing.

          If,  before  closing,  Purchaser  discovers  that  Seller  is  not  in
compliance with applicable  Environmental  Laws, and such  non-compliance  would
adversely  affect the value of the Property by $15,000 per occurrence or $75,000
in  the  aggregate  net  to  Seller's  interest  in the  affected  property  (an
"Environmental  Defect")  Purchaser shall give Seller written notice thereof not
later than ten (10) business  days prior to closing  together with the basis for
such  assertion and data in support  thereof,  and shall furnish Seller with any
proposed  reduction  in the  Purchase  Price  attributable  to each such matter.
Environmental  Defects shall be resolved  under the  provisions of Paragraph 13.
Any  Environmental  Defect  which is not  brought to Seller's  attention  in the
manner and within the time  period set forth  above shall be deemed to have been
waived by Purchaser.

       13.  Purchase  Price  Adjustments.  Purchaser may, by delivery of written
notice in good  faith to  Seller of the  existence  of a Title  Defect,  request
reduction of the Purchase  Price for the property  affected.  Seller may in good
faith  request an  increase in the  Purchase  Price of a property by delivery to
Purchaser  of written  notice that the net revenue  interest  actually  owned by
Seller therein is greater than that shown on Exhibit A-1. Provided  however,  an
adjustment in the Purchase  Price pursuant to this Section 13 shall be made only
if the total net value of all adjustments  claimed by the affected party (either
Seller or  Purchaser),  net to Seller's  interest in the affected  property,  is
greater than $100,000.00 exclusive of exercised  preferential rights to purchase
or rights  of first  refusal,  but  inclusive  of other  necessary  consents  or
approvals which

<PAGE>




are refused,  as described in Section 14. This  $100,000.00  sum is a threshold,
and assuming it is exceeded, the party entitled to the adjustment shall have the
adjustment in its favor by the total amount of the  adjustment,  including  this
initial $100,000.00.

      Any such notice by Purchaser or Seller shall include appropriate  evidence
to  substantiate  its  position  and shall be delivered to the other party on or
before ten (10) business days prior to closing.  After said date Purchaser shall
be deemed to have fully  inspected  and  accepted  the Property "as is" in their
then current  physical and  environmental  condition  and the Property  shall be
deemed to be free of Title Defects except for those with respect to which notice
has been given in the manner and within the time period above provided.

      Upon timely delivery of a notice by Purchaser of Title Defects aggregating
in excess of  $100,000.00,  as  provided  above,  Seller  shall elect one of the
following options with respect to each Title Defect separately:

            (a)  attempt  to cure the  Title  Defect at  Seller's  sole cost and
      expense  within  sixty (60) days after  receipt of the  notice;  if Seller
      elects this option but is unsuccessful in curing the Title Defect,  seller
      may then elect option (b), (c) or (d), below, as is appropriate;

            (b) subject to Seller's rights under option (c),  below,  agree to a
      mutually acceptable Purchase Price reduction based on the following:

                  (i) if the Title Defect is an Environmental Defect, the amount
            of  the  Purchase  Price  reduction  shall  not  be  limited  to the
            Allocated Value for the affected portion of the Property, but rather
            shall be equal to the costs  reasonably  associated with curing such
            Environmental Defect;

                  (ii) except as provided in the preceding  sentence with regard
            to an Environmental Defect, the Purchase Price adjustment to resolve
            the  Title  Defect  shall  be  based  on  the  reasonably  estimated
            diminution  of value to the  affected  Property,  not to exceed  the
            Allocated  Value,  if any,  and to the  extent  possible,  shall  be
            determined  in good  faith  and in  accordance  with  the  following
            guidelines for the Title Defects specifically described therein:

                        (1) If a Title  Defect is based upon  notice that Seller
                  owns a different net revenue interest or working interest than
                  that shown on Exhibit  A-1,  then the value for the portion of
                  the Property  affected  shall be reduced or increased  (as the
                  case may be) proportionately to reflect the changes in the net
                  revenue and working interest from those shown on

<PAGE>




                  Exhibit  A-1,  and the  Purchase  Price  shall be  reduced  or
                  increased accordingly.

                        (2) If a Title  Defect is a lien,  encumbrance  or other
                  charge upon a property which is liquidated in amount, then the
                  sum  necessary  to be paid to the  obligee to remove the Title
                  Defect from the affected  property  shall be deducted from the
                  Purchase Price. If a Title Defect  represents an obligation or
                  burden  upon the  affected  property  for which  the  economic
                  detriment to Purchaser is not  liquidated but can be estimated
                  with  reasonable  certainty,  the adjustment  shall be the sum
                  necessary to  compensate  Purchaser at closing for the adverse
                  economic  effect  which  such  Title  Defect  will have on the
                  affected  property.  If there is a lien or  encumbrance in the
                  form of a  judgment  secured  by a  supersedeas  bond or other
                  security  approved by the court  issuing such order,  it shall
                  not  be  considered  a  Title  Defect  under  this  Agreement.
                  Notwithstanding  the existence of any bond or other  security,
                  if the  judgment  affecting a portion of the  Property  shall,
                  upon becoming  final,  result in Seller being  divested of its
                  ownership position in this portion of the Property,  then this
                  judgment  shall  be  considered  a  Title  Defect  under  this
                  Agreement and the Purchase Price adjusted accordingly.

            (c) if the parties  acting in good faith  cannot  agree as to either
      the  existence  of a Title  Defect or the amount of the  reduction  in the
      Purchase  Price as  contemplated  by (b) above,  or if the Purchase  Price
      reduction for any portion of the Property under option (b), above,  equals
      or exceeds the Allocated Value of the affected portion,  Seller may remove
      the portion of the Property affected by the Title Defect from the sale and
      the Purchase Price shall be reduced by the Allocated Value attributable to
      the portion of the Property so removed, or

            (d) terminate this Agreement without liability to Purchaser provided
      that Seller may not terminate this Agreement unless the aggregate value of
      all Purchase  Price  downward  adjustments  resulting  from the good faith
      application  of this Section 13 exceeds One Million Five Hundred  Thousand
      Dollars  ($1,500,000.00)  exclusive  of exercised  preferential  rights to
      purchase or rights of first  refusal,  but  inclusive  of other  necessary
      consents or approvals which are refused. In the event of such termination,
      Escrow Agent shall return the Earnest Money to Purchaser.

      The parties  shall use their best  efforts to reach an agreement as to the
existence  and  resolution  of all Title  Defects no later than two (2) business
days prior to closing.

<PAGE>




      In the event a third party exercises an applicable  preferential  right to
purchase,  the  Purchase  Price shall be reduced by the  Allocated  Value of the
portion of the Property  affected and closing shall occur as to the remainder of
the Property.

      Including  Purchase Price adjustments  attributable to the exercise of any
preferential  right to  purchase,  in the event the net  amount of the  Purchase
Price  adjustments  downward  exceeds Two Million Dollars  ($2,000,000.00)  then
Purchaser may, upon written  notice to the Seller,  terminate this Agreement and
the  same  shall  be of no  further  force  and  effect.  In the  event  of such
termination, Escrow Agent shall return the Earnest Money to Purchaser.

       14. Preferential Rights to Purchase and Related Matters. Certain portions
of the Property may be subject to  preferential  rights to purchase or rights of
first refusal,  or similar rights, in favor of third parties.  In addition,  any
conveyance of certain portions of the Property may be subject to the approval or
consent of third  parties.  Seller has used its best  efforts  to  identify  and
describe in Exhibit E attached hereto all such rights and necessary  consents or
approvals, and, to the best of Seller's knowledge, information and belief, there
are no such rights,  consents or approvals other than those set forth on Exhibit
E. However, Seller does not warrant this to be the case, and it is possible that
Purchaser's  due  diligence  review  under  Section 11 could turn up  additional
rights,  consents or approvals.  Upon  execution of this Agreement by Seller and
Purchaser,  Seller shall immediately provide any required notices to the holders
of such  preferential  rights or rights of first refusal in accordance  with the
documents which created such rights, or shall request any required  approvals or
consents.  The  values to be  assigned  to said  portions  of the  Property  for
purposes of giving  notice shall be the  respective  Allocated  Values for those
portions of the Property  reflected  on Exhibit "B" attached to this  Agreement.
Subject to the  provisions of Section 13 above,  if any holder of a preferential
right to purchase or a right of first  refusal  exercises  such right,  or if by
closing there exists any unwaived, unexercised preferential right to purchase or
right of first  refusal  which has not  expired,  or if a necessary  approval or
consent is refused,  the affected property shall be deleted from this Agreement,
and Purchaser  shall not be relieved of its obligation to purchase the remainder
of the Property.  In such event, however, the Purchase Price shall be reduced by
the amount of the Allocated Value of those portions of the Property with respect
to which  preferential  rights to purchase or rights of first  refusal have been
exercised,  or with  respect to which  there  exist  unwaived,  unexercised  and
unexpired  preferential  rights to purchase or rights of first refusal,  or with
respect to which necessary approvals or consents have been refused. If Purchaser
receives a reduction in the Purchase  Price as a result of the  existence of any
unwaived, unexercised preferential right to purchase which has not expired as of
closing,  the  portion of the  Property  affected  thereby  shall be conveyed to
Purchaser  upon either the waiving or  expiration  of the right to exercise such
preferential  right to purchase,  and  Purchaser  shall  concurrently  remit the
Allocated  Value  attributable  to such  portion  of the  Property  to Seller or
Chemical Bank, if so directed by Seller.

<PAGE>





        15. Conveyance Documents. At the closing the Property, or those portions
of the Property  which are being  purchased by  Purchaser,  shall be conveyed to
Purchaser or its designee using the form of assignment which is attached to this
Agreement as Exhibit J. In addition, Seller shall execute a sufficient number of
conveyances  or assignments on official forms as may be necessary to satisfy the
regulatory  requirements  of any  pertinent  governmental  agency or  authority,
including, but not limited to, the United States Bureau of Land Management,  the
New Mexico State Land Office,  or the Texas General Land Office.  Any assignment
and bill of sale, deed, lease or other conveyance executed pursuant hereto shall
be without any warranty or  representation  of title,  either express,  implied,
statutory or  otherwise,  but shall  include  language  sufficient to convey any
after  acquired  interests of Seller in the  Property,  and shall be without any
express,  implied,  statutory  or other  warranty  or  representation  as to the
condition,  quantity,  quality, fitness for a particular purpose,  conformity to
models or samples of materials or merchantability of any of the equipment or its
fitness for any purpose,  and without any other express,  implied,  statutory or
other warranty or representation whatsoever.

       16.  Conditions of Closing by Purchaser.  The obligation of Purchaser to 
close is subject to the satisfaction of the following conditions:

            (a)  Purchaser  shall  have  had  reasonable  access  during  normal
      business hours to all data and records obligated to be provided  Purchaser
      as provided herein;

            (b)  Purchaser  shall have had  reasonable  access to the Leases and
      equipment  included  in the  Property  to  conduct an  inspection  for all
      purposes, including environmental condition;

            (c) Seller shall not be in Material  Breach (as that term is defined
      in paragraph  (e) of Section 11) of its  representations  and covenants as
      contained in this Agreement (except that this condition shall not apply to
      any representation or covenant for which there has been a price adjustment
      under  Sections  13 or 14, or which has been  waived  by  Purchaser),  and
      Seller shall have  performed and satisfied all agreements and covenants in
      all material  respects  required by this  Agreement  to be  performed  and
      satisfied by Seller;

            (d) Seller shall have  obtained and  delivered to Purchaser  (i) all
      prerequisite  waivers  of  preferential  rights of  purchase  and (ii) all
      necessary  consents  for transfer of the  Property,  except those which by
      their  nature  cannot be  requested or obtained  until after  closing,  or
      except  those  with  respect  to which  Purchaser  and  Seller  shall have
      adjusted the Purchaser  Price in accordance with the provisions of Section
      14 of this Agreement;

<PAGE>




            (e) No suit or other  proceeding  shall  be  pending  or  threatened
      before any court or governmental agency seeking to restrain,  prohibit, or
      declare  illegal,  or seeking  substantial  damages in connection with the
      transaction contemplated hereby; and

            (f) No material  adverse  change in the condition of or title to the
      Property  shall have occurred  subsequent to the  Effective  Date,  except
      depletion through normal production within authorized allowables, ordinary
      changes in rates of  production,  and  depreciation  of equipment  through
      ordinary wear and tear.

       17.  Conditions of Closing by Seller.  The obligation of Seller to close 
is subject to the satisfaction of the following conditions:

            (a) All  representations  of Purchaser  contained in this  Agreement
      shall be true, correct,  and not misleading in all material respects,  and
      Purchaser  shall have performed and satisfied all agreements and covenants
      in all material  respects  required by this  Agreement to be performed and
      satisfied by Purchaser;

            (b) No suit or other  proceeding  shall  be  pending  or  threatened
      before any court or governmental agency seeking to restrain,  prohibit, or
      declare  illegal,  or seeking  substantial  damages in connection with the
      transaction contemplated hereby.

      Neither party shall be obligated to close until all necessary filings have
been made and all  waiting  periods  have  expired  under the  Hart-Scott-Rodino
Antitrust Improvements Act of 1976.

       18.  Preliminary   Closing  Statement.   To  the  extent  that  necessary
information is then available,  Seller shall prepare and furnish to Purchaser at
least two (2) business  days prior to closing a  preliminary  closing  statement
setting forth the  adjustments  to the Purchase Price to be paid by Purchaser at
closing.  Such statement shall reflect each adjustment and the calculation  used
to determine such amount. The preliminary adjusted Purchase Price shall mean the
Purchase Price adjusted as provided herein,  including but not limited to, Title
Defects,  Environmental Defects,  interest variances, gas imbalances,  operating
expense and revenues  attributable  to the Interests being conveyed on and after
the  Effective  Date.  Insofar  as  concerns  operating  expenses  and  revenues
attributable  to the  Property  subject  to  closing  for the  period  from  the
Effective  Date  through  closing,  for  purposes  of  the  preliminary  closing
statement,  Purchaser  shall receive a net  adjustment  for estimated  operating
expense and revenues for those  periods for which the actual  amounts  cannot be
determined at closing.  Final adjustments to the actual gas balancing,  expenses
incurred  and  revenues  received  shall  be taken  into  account  on the  Final
Statement.

<PAGE>




       19. Post-Closing  Adjustments.  As soon as practicable after closing, but
in any event within  forty-five (45) days thereafter,  Seller shall prepare,  in
accordance  with this  Agreement  and  (where  applicable)  in  accordance  with
generally  accepted  accounting   principles   consistently   applied,  a  final
settlement  statement (herein called the "Final  Statement")  setting forth each
adjustment  or payment which was not finally  determined as of the closing,  and
showing  the  calculation  of the final  settlement  price  based on such  Final
Statement  (the  "final  settlement  price").  Seller  shall  submit  the  Final
Statement to Purchaser  and shall afford  Purchaser  access to Seller's  records
pertaining  to the  computations  contained in the Final  Statement.  As soon as
practicable after receipt of the statement,  Purchaser shall deliver to Seller a
written report  containing any changes which  Purchaser  proposes be made to the
Final  Statement.  The  parties  shall  agree with  respect to the  amounts  due
pursuant to such post-closing  adjustments not later than thirty (30) days after
Purchaser's  receipt  of  Seller's  Final  Statement.  The date upon  which such
agreement is reached shall be herein called the "Settlement  Date". In the event
that (i) the final settlement  price is more than the amount  previously paid to
Seller, Purchaser shall pay to or as directed by Seller in immediately available
funds the amount of such difference;  or (ii) the final settlement price is less
than the amount  previously  paid to Seller,  Seller or the party  receiving the
balance of the funds at closing shall pay to Purchaser in immediately  available
funds the amount of such difference.

       20.  Closing.  The  transaction  contemplated  by this Agreement shall be
closed by an Escrow  Agent (the  "Escrow  Agent")  who shall be  selected by the
agreement  of Seller  and  Purchaser.  Closing  shall  take  place at a location
agreeable  to Seller,  Purchaser  and Escrow  Agent at a time  agreeable to them
which is not later than June 4, 1996,  provided  that said date may be postponed
or changed by a writing signed by both Seller and Purchaser.

      The Earnest Money shall be applied to the Purchase Price at closing. At or
prior to the closing, Purchaser shall deliver or cause to be delivered to Escrow
Agent the balance of the Purchase  Price for that portion of the Property  which
is being  purchased,  subject to applicable  prorations and  adjustments.  At or
prior to the closing,  Seller  shall  deliver or cause to be delivered to Escrow
Agent the following:  (i) appropriate conveyance documents covering that portion
of the Property which is being purchased;  and (ii) subject to the provisions of
Section 10,  releases of the Siete Liens  insofar as they affect that portion of
the Property being purchased.

      At the closing,  Escrow Agent shall close the transaction  contemplated by
this Agreement as follows:

            (a)   Escrow Agent shall make all appropriate prorations and 
adjustments.

<PAGE>




            (b) Escrow Agent shall deliver to Purchaser all conveyance documents
      as provided in Section 15 of this Agreement.

            (c) Subject to and in accordance  with the provisions of Section 10,
      Escrow Agent shall pay the holders of debt secured by Siete Liens,  except
      for that held by Chemical Bank which shall not be paid in full, but rather
      that  portion  which is being paid will be paid out of the  balance of the
      Purchase  Price in accordance  with the  arrangements  between  Seller and
      Chemical  Bank  pertaining  thereto,  and Escrow  Agent shall  deliver the
      releases  of the Siete  Liens  being  released,  including  those  held by
      Chemical Bank, to Purchaser.

            (d)  Subject to the  provisions  of Section 10,  Escrow  Agent shall
      deliver to Seller or Chemical Bank as directed by both of them the balance
      of all funds deposited with Escrow Agent after appropriate deductions have
      been made for prorations and adjustments.

      The terms,  provisions  and  conditions of this  Agreement  shall serve as
escrow and closing  instructions to the Escrow Agent.  Such  instructions may be
supplemented  by reasonable  conditions of acceptance of the Escrow Agent to the
extent  that the same  are not  inconsistent  with  the  terms,  provisions  and
conditions of this Agreement.

      Ad valorem,  production,  severance and any other tax based on production,
if any, attributable to any of the Property being purchased shall be paid by the
party  receiving the  production  upon which the tax is based.  At closing,  all
other taxes,  except income taxes which shall remain the  responsibility  of the
appropriate  party, shall be prorated as of the Effective Date. All oil, gas and
hydrocarbon substances  ("Production") produced and delivered or stored in tanks
and/or gathering lines as of the Effective Date shall belong to Seller,  and all
Production produced on or after the Effective Date shall belong to Purchaser, or
the sales proceeds thereof shall be credited to Purchaser by Seller. All storage
tanks shall be measured or gauged by the  parties on the  Effective  Date,  such
measurement  or  gauging  to be from a point 24 inches  above the  bottom of the
tanks.  Such  measurement  may  be  based  upon  the  meter  readings  or  other
information in the  possession of Seller and  consistent  with any reports filed
with any appropriate state regulatory agency. Proration of the Production in the
tanks will be accomplished in accordance with the results of said measurement or
gauging.  At and after  closing,  Purchaser  shall be  entitled  to  proceeds or
revenues from the Production  which is produced on or after the Effective  Date,
and, subject to the covenants and terms hereof, Purchaser shall assume, bear and
pay all operating expenses or leasehold preservation costs incurred by Seller in
the ordinary course of business on and after the Effective Date. Seller shall be
entitled to receive actual,  physical  disbursement of proceeds from the sale of
such  Production  prior to closing,  provided that at closing,  Purchaser  shall
receive a credit toward the Purchase Price for any such proceeds

<PAGE>




received by Seller on or after the Effective Date, after deducting therefrom all
operating  expenses or  leasehold  preservation  costs  incurred by Seller on or
after the Effective Date. Pending implementation of conveyance documents,  it is
possible that Seller will receive payments for Production  produced on and after
the closing  which are properly  payable to  Purchaser,  but which have not been
credited  against the Purchase Price as provided above.  In this regard,  Seller
agrees  promptly  to deliver to  Purchaser  all such  payments  and any  related
production data received by it with respect to Production produced subsequent to
closing.

      All recording and filing fees shall be the responsibility of Purchaser.

      At closing, or as soon thereafter as is practical, Seller shall deliver to
Purchaser all original  files,  records,  data and information of every kind and
character  in  Seller's   possession  which  directly  relate  to  the  Property
(collectively "the Files"), but only to the extent that Seller may do so without
violating any  obligation of  confidence  or  contractual  commitment to a third
party,  and only to the extent that the same are not based upon  confidential or
proprietary systems or techniques  developed by Seller or any of its consultants
which  could not be  transferred  without  the  transfer  or  disclosure  of the
underlying  system or  technique.  "The Files" shall not include any of Seller's
corporate,  financial  and  general tax  records.  Within the  five-year  period
commencing on the closing date,  Seller shall have the right to photocopy,  copy
or reproduce any of the Files at its written  request to  Purchaser,  and at its
sole expense.

       21.  Risk of Loss.  The risk of loss of or casualty to any portion of the
Property shall be and shall remain upon Seller until the closing. After closing,
the risk of loss or  casualty  shall pass to  Purchaser.  If,  prior to closing,
there occurs a loss or casualty  which is covered by  insurance,  and if closing
occurs with respect to the affected  property,  any  insurance  proceeds paid to
Seller with respect thereto shall be credited toward the payment of the Purchase
Price. If, before the closing,  there occurs any material loss of or casualty to
any of the Property (including loss through  condemnation or the exercise of the
right of  eminent  domain  or  proceedings  for such  purposes  are  pending  or
threatened) which is not fully compensated by insurance, the portion of the loss
or casualty which is not  compensated by insurance shall be deemed to be a Title
Defect and shall be dealt with as provided  in Section 13. For  purposes of this
Paragraph,  a loss or casualty is not  "material"  unless the resulting  cost of
repair  or  replacement,  or the  resulting  value  of lost  reserves,  less any
insurance proceeds paid, exceeds $15,000.00.

       22.  Notification of Production Purchasers - Transfer Orders. Purchaser 
shall be responsible for notifying all purchasers of production regarding the 
closing of the transaction contemplated by this Agreement.  In this regard, 
Seller agrees to cooperate with Purchaser in executing transfer orders, or 
letters in lieu thereof, and other documents as may be necessary

<PAGE>




to  accomplish  the transfer of the Property to the  satisfaction  of production
purchasers, which documents shall be executed and exchanged at closing.

       23.  Covenants of Purchaser - Indemnity.

            (a) On and after the  closing,  Purchaser  shall  assume  and timely
      perform  and  discharge  all  duties  and  obligations  of an owner of any
      interest  in the  Property,  whether  imposed  by  contract,  rule of law,
      statute, regulation or otherwise,  including, but not limited to, plugging
      and  abandonment of any and all existing and future wells,  restoration of
      the surface,  and  environmental  and pollution  clean up or  remediation.
      Seller  shall  incur no  liability  for  Purchaser's  failure to  properly
      perform or discharge any such duties or obligations.

            (b)  To  the  extent  required  by,  and  in  accordance  with,  all
      applicable laws, rules and regulations and other obligations  imposed upon
      Purchaser  by  contract,  Purchaser  shall  plug  and  abandon  all  wells
      (including,  but not limited to, salt water disposal  wells) which,  as of
      the Effective Date or thereafter,  are located on the lands subject to the
      Leases  or on lands  pooled  therewith,  or  otherwise  in which  Seller's
      interests are hereby transferred.

            (c) To the extent required by, and in accordance with all applicable
      laws, rules and regulations and other  obligations  imposed upon Purchaser
      by contract,  Purchaser  shall remove all  abandoned or unused  production
      facilities and equipment,  which,  as of the Effective Date or thereafter,
      are located on the lands  subject to the said  Leases,  or on lands pooled
      therewith,  or on lands subject to this  Agreement,  or otherwise in which
      Seller's interests are hereby transferred.

            (d) After  closing but as of the Effective  Date,  and to the extent
      required  by,  and in  accordance  with all  applicable  laws,  rules  and
      regulations  and other  obligations  imposed by contract,  Purchaser shall
      restore associated or affected surface areas, conforming to and satisfying
      the terms and conditions of the said Leases and/or any  agreements,  laws,
      orders, rules, regulations or permit obligations pertinent thereto.

            (e) Purchaser  shall pay the cost of all plugging and abandonment of
      wells,  all  removal  of  facilities,  equipment  and  pipelines,  and all
      restoration of lands which may be performed by third parties on any wells,
      facilities,  equipment  or  pipelines  located on the Property or on lands
      pooled or unitized  therewith to the extent that these  obligations  arise
      from and after the Effective Date.

<PAGE>




            (f) Until the closing, Purchaser shall exercise reasonable diligence
      in safeguarding  and maintaining  secure and confidential all confidential
      data and  information  provided  to  Purchaser  by Seller  relating to the
      Property.  If  the  transaction  contemplated  by  this  Agreement  is not
      consummated,  Purchaser will use its best efforts to keep the  information
      and data which is not public  knowledge  or  otherwise  disseminated,  and
      which is  furnished  to  Purchaser  by or on  behalf of  Seller,  strictly
      confidential  and  will  not  use  any of  such  information  or  data  in
      competition with Seller.

            (g) For  purposes of this  Paragraph  (g),  "Claims"  shall mean all
      claims, losses, damages,  demands,  suits, causes of action,  liabilities,
      fines, penalties,  expenses and costs (including attorneys' fees, costs of
      litigation  and/or  investigation  and other costs associated  therewith).
      Purchaser  shall  fully  protect,  indemnify  and  defend  Seller  and its
      officers, agents, employees, directors and shareholders against, and shall
      hold them harmless  from,  any and all Claims which accrue on or after the
      Effective  Date and which  arise out of, are related to, or in any way are
      connected with, indirectly or directly, in whole or in part, the ownership
      or  operation  of any of the  Property by  Purchaser,  including,  but not
      limited to, Claims for the following:

                   (i)   injury to or death of any person;

                   (ii)  damage to or loss of any property or resource, or any 
            interest therein;

                   (iii)  pollution,   contamination  or  environmental  damage,
            liability or violation of any kind,  including,  but not limited to,
            the  use,  handling,   generation,   release,  discharge,   storage,
            transportation or disposal of any of the following: hazardous, toxic
            or radioactive materials, substances or wastes, or other pollutants,
            contaminants or wastes;

                   (iv)  the  presence  of any  facilities,  equipment  or  pipe
            contaminated   by   naturally   occurring   radioactive   materials,
            including, but not limited to, such Claims as may relate to the use,
            resale,  removal,  handling  or  disposal  of any such  contaminated
            facilities, equipment or pipe;

                  (v) Claims relating to Purchaser's failure properly to perform
            or discharge all duties and  obligations of an owner of any interest
            in  the  Property  including,  but  not  limited  to,  plugging  and
            abandonment of any and all existing and future wells, restoration of
            the  surface,   and   environmental   and  pollution   clean  up  or
            remediation.

<PAGE>




      The  indemnities  and  obligations  to defend set forth  above shall apply
      regardless of the cause,  and  regardless of whether any such Claims arise
      in whole or in part from any act, omission, negligence or strict liability
      of   Purchaser  or  its   officers,   agents,   employees,   directors  or
      shareholders,  or any other person or entity (other than Seller),  whether
      imposed by contract, rule of law, statute,  regulation or otherwise.  Such
      indemnities  and  obligations  to defend shall  survive the closing of the
      transaction contemplated by this Agreement.

      24.   Environmental Escrow Account.

            (a) Purpose. The undersigned parties acknowledge and understand that
      Purchaser   will  conduct  the  physical  and   environmental   inspection
      contemplated  by the terms of  Section  12  hereof.  Notwithstanding  this
      review,  the parties  acknowledge  that there exists the possibility  that
      there are latent environmental  issues not readily  ascertainable from the
      type of environmental review contemplated by Section 12. It is not unusual
      for  agreements  of this type to provide for a  "look-back"  period  after
      closing regarding certain defined  environmental issues, and the Purchaser
      customarily   requires  in   transactions  of  this  nature  that  such  a
      "look-back"  period  exist.  Inasmuch  as the Seller  does not  anticipate
      having a continued  existence as a financially  capable entity which would
      be  in a  position  to  remediate  pre-existing  environmental  conditions
      identified in accordance  with such  a"look-back"  provision,  the parties
      have sought to arrive at a mechanism  to safeguard  the  interests of both
      parties  with regard to  environmental  issues  other than  conducting  an
      inspection that far exceeds the scope and cost of that customarily done in
      transactions  of this type.  It is for these reasons that the parties have
      created  the  environmental  escrow  account set forth  herein  which will
      operate as follows:

            (b) Definitions.  As used in this section,  the following terms will
      have the meanings ascribed thereto.  Capitalized terms which are otherwise
      defined in this Agreement  shall retain the same  definition as previously
      set forth.

                  (1) "Condition"  shall mean a material  adverse  environmental
      condition  which was created  prior to, and  existed as of, the  Effective
      Date. "Conditions" shall mean more than one material adverse environmental
      condition.

                  (2) "material  adverse  environmental  condition" shall mean a
      condition  that (i)  applicable  Environmental  Laws in  effect  as of the
      Effective Date required to be  remediated,  and (ii) the cost to remediate
      the  Condition to the levels  required by  applicable  Environmental  Laws
      exceeds  $15,000;  however  if  the  total  cost  to  remediate  all  such
      Conditions  exceeds  $75,000  then  all  such  circumstances  shall in the
      aggregate  be deemed to be a  material  adverse  environmental  condition.
      These dollar amounts are

<PAGE>




      threshold amounts, not deductibles, and are net to Seller's ownership in 
      the affected portion of the Property.

                  (3)  "Environmental  Laws"  shall  be as  defined  in  Section
      7(u)(i)  hereof,  and  shall  specifically  not  include  other  types  of
      governmental  regulations  not of this type,  even if such are intended to
      protect  the health and welfare of workers or the  public,  including  the
      regulations  of the  Occupational  Safety and Health  Administration,  the
      Texas  Railroad  Commission  Operating  Regulations,  the New  Mexico  Oil
      Conservation Division Regulations, the provisions of applicable contracts,
      and  other  types  of  statutes,  regulations,  ordinances,  and  contract
      provisions,  unless and except  they fit within the  previously  described
      definition of Environmental Laws.

            (c) Notification Procedure. If within one year of closing, Purchaser
      determines  and  notifies  the Escrow Agent in writing that there exists a
      Condition  or  Conditions  arising  from  operations  on or the use of the
      Property,  or a portion thereof, and that such Condition or Conditions was
      created  prior  to  the  Effective  Date,   notwithstanding  its  date  of
      discovery,  then  Purchaser  shall be deemed to have  satisfied the notice
      requirements of this Section.

            (d) Response Upon Notification. It is understood and agreed that the
      Escrow  Agent  shall,  to  the  extent  of  the  escrow  account,   assume
      responsibility to the extent of Seller's former ownership  interest in the
      affected portion of the Property for the cost of any necessary remediation
      for any  Condition of which it has received  timely  notice in  accordance
      with this Section,  presuming that remediation is the strategy agreed upon
      by Escrow Agent and  Purchaser.  Escrow Agent and Purchaser will cooperate
      with one  another  to  devise  an  appropriate  strategy  to deal with any
      Condition.  These strategies include remediation or such other approach as
      these entities may agree.  If no agreement is reached,  the default remedy
      for  a  Condition  will  be  remediation.  Notwithstanding  the  preceding
      sentence,  the cost of such remediation  attributable to Seller's interest
      in the  affected  portion  of the  Property  shall only be paid out of the
      escrowed sums including the interest  earned thereon  provided for in this
      Section. Seller and Escrow Agent shall have no liability or responsibility
      for the  expense of  remediation  beyond,  or in excess  of, the  escrowed
      funds. Remediation shall proceed in such a manner so as to comply with all
      applicable Environmental Laws. For any Property not previously operated by
      Seller, the default remedy is that Purchaser will be paid a portion of the
      escrowed  sums  sufficient  to pay  for the  share  of  remediation  costs
      attributable to Seller's former ownership interest in the affected portion
      of the Property.

            (e)   Arbitration.  If the Escrow Agent and Purchaser cannot agree 
      on the cost to remediate the Condition or Conditions or cannot agree as 
      to whether or not a Condition

<PAGE>




      exists,  the  appropriate  issue or issues  will be  submitted  to binding
      arbitration  in  accordance  with the  rules of the  American  Arbitration
      Association using a single arbitrator. In lieu of the Escrow Agent bearing
      the  obligation  and expense of  arbitration  of either  issue  identified
      herein (cost or existence of a  Condition),  the position to be arbitrated
      that is contrary to the  position of  Purchaser  can either be asserted by
      Seller or by Chemical  Bank.  With regard to the  arbitration of any issue
      hereunder,  each party to such  arbitration  shall bear its own costs, and
      such costs  shall not be  deducted  from the amount of money in the escrow
      account.

            (f) Escrowed Funds.  To provide for the escrow account  contemplated
      by this  Section,  at closing  Purchaser  shall deduct  $250,000  from the
      Purchase  Price and shall deposit such sum with the Escrow Agent who shall
      further place these monies in an interest  bearing account for the purpose
      of satisfying any costs  associated with the cleanup or remediation of any
      Condition.  After all Conditions have been resolved in accordance with the
      terms of this  Section,  the balance of the sums  remaining  in the escrow
      account,  if any,  together  with any interest  thereon,  shall be paid to
      Chemical  Bank.  Thus,  these  escrowed  sums can only be paid directly to
      Purchaser if such sums are for remediation costs for a Condition.

      25. HSR Act. Seller and Purchaser  acknowledge  that this Agreement may be
subject to and conditioned upon compliance with 15 U.S.C.  ss.18a, and all rules
and regulations promulgated thereunder or pursuant thereto. Seller and Purchaser
each agree to make such filings and provide such  information as may be required
under said statute,  rules or regulations as soon as possible after execution of
this Agreement.  Seller and Purchaser further agree to cooperate with each other
in making such filings and providing such information.  The obligation of Seller
to sell the Property to Purchaser,  and the  obligation of Purchaser to purchase
the Property  from Seller,  is subject to, and is  expressly  conditioned  upon,
compliance with all requirements,  and obtaining all necessary consents,  as may
be prescribed or set forth in said statute, rules or regulations.

      26.  Default  by  Purchaser.  If, at and as of  closing,  Seller is ready,
willing, and able to close the transaction  contemplated by this Agreement,  and
has complied in all material  respects with its  obligations as imposed  hereby,
and Purchaser, in breach of the provisions of this Agreement fails or refuses to
close this transaction in accordance  herewith,  Seller,  as its sole remedy for
such a failure or refusal to close,  may declare this Agreement  terminated,  in
which event  Seller  shall be entitled to receive  from Escrow Agent the Earnest
Money as  liquidated  damages,  and  neither  party  shall  thereafter  have any
obligation one to the other by reason of this Agreement,  except for obligations
of  confidentiality.  If Seller brings an action against Purchaser or institutes
or pursues  other legal  proceedings  to enforce  this  Agreement  or any of the
provisions  of this  Agreement,  or to  enforce  any of its  rights  under  this
Agreement,

<PAGE>




and if Seller obtains  judgment or other relief against or from Purchaser,  then
Purchaser  shall  pay  Seller  all  costs  and  expenses  incurred  by Seller in
obtaining such judgment or relief,  including reasonable  attorneys' fees, court
costs, and expenses of litigation.  A termination of this Agreement by Purchaser
pursuant  to Section  13 shall not be a failure  or refusal to close  within the
meaning of this Section.  The liquidated  damages  provided for above shall only
apply to a failure or refusal of Purchaser to close in breach of this Agreement.


      27.  Default  by Seller.  If, at and as of  closing,  Purchaser  is ready,
willing, and able to close the transaction  contemplated by this Agreement,  and
has complied in all material  respects with its  obligations as imposed  hereby,
and Seller,  in breach of the provisions of this Agreement,  fails or refuses to
close this transaction in accordance herewith,  Purchaser shall be entitled to a
return of the Earnest Money and may bring an action against Seller for breach of
contract  and/or  specific  performance,  and shall have all available legal and
equitable  remedies.  In the  alternative,  Purchaser may declare this Agreement
terminated,  in which  event  Purchaser  shall be  entitled  to a return  of the
Earnest  Money and shall also be entitled to receive  $500,000.00  as liquidated
damages, and neither party shall thereafter have any obligation one to the other
by reason of this  Agreement,  except for  obligations  of  confidentiality.  If
Purchaser  brings an action  against Seller or institutes or pursues other legal
proceedings  to  enforce  this  Agreement  or  any  of the  provisions  of  this
Agreement,  or to  enforce  any of  its  rights  under  this  Agreement,  and if
Purchaser  obtains judgment or other relief against or from Seller,  then Seller
shall pay Purchaser all costs and expenses  incurred by Seller in obtaining such
judgment or relief,  including  reasonable  attorneys'  fees,  court costs,  and
expenses of litigation.  A termination  of this Agreement by Seller  pursuant to
Section 13 shall not be a failure or refusal to close within the meaning of this
Section. The liquidated damages provided for above shall only apply to a failure
or  refusal  of Seller to close in breach of this  Agreement.  Any breach of any
representation  or covenant (other than the covenant to close) shall not entitle
Purchaser  to  liquidated  damages.  Nor shall a breach of a  representation  by
Seller give rise to any claim,  cause of action or remedy other than as provided
for in Section 13.

      28. Notices.  All notices contemplated by this Agreement may be given to 
the parties or to the Bank at the following addresses:

      (a)   If to Seller, to:

            Siete Oil & Gas Corporation
            P. O. Box 2523
            Roswell, NM 88202-2523

                  or

<PAGE>




            Petroleum Building
            200 West First Street
            Suite 200
            Roswell, NM 88201
            Attention:  Mr. Gene Shumate, President

      (b)   If to Purchaser, to:

            St. Mary Land & Exploration Company
            1776 Lincoln Street, Suite 1100
            Denver, CO  80203
            Telephone:  (303) 861-8140
            Fax:  (303) 861-0934

            Attention:  Mr. Milam Randolph Pharo, Vice President - Land


                  and

            Riverhill Energy Corporation
            P.O. Box 2726
            Midland, TX  79702-2726
            Telephone:  (915) 688-0708
            Fax:  (915) 688-0765

            Attention:  Mr. J.W. Ramsey, Vice President - Exploitation

      (c)   If to Bank, to:






      29.  Further Assurances.  After closing each of the parties shall execute,
acknowledge and deliver to the other such further instruments, and take such 
other actions as may be reasonably necessary to carry out the provisions of this
Agreement.

      30. Operations by Seller. Seller will operate the Seller-operated Property
until the later of  closing,  the  Effective  Date,  or the time the  applicable
operating agreement or plan of unitization may require, at which time operations
will be turned over to, and become the  responsibility  of, Purchaser,  unless a
third party is elected Operator under such agreement.

<PAGE>




Seller  makes no  representation  that  Purchaser  will be elected or  appointed
Operator of any property  included within the Property.  Seller shall reasonably
assist  Purchaser or its  designee in its efforts to become  Operator for any of
the Property in which Seller served as Operator.

            (a)  Operations  conducted by Seller after the  Effective  Date with
      respect  to the  Property  will be  conducted  on behalf of  Purchaser  in
      accordance with any applicable  operating  agreements,  and Purchaser will
      pay Seller for operation,  protection  and  maintenance of the Property in
      accordance  with the  terms and  provisions  of any  applicable  operating
      agreement,   provided  that  with  regard  to  operations  after  closing,
      Purchaser will pay all actual costs (including  administrative overhead as
      allowed by the  applicable  COPAS)  incurred  by Seller with regard to the
      Property and will further pay  operation  and  administrative  overhead to
      Seller  at a rate  equal to  twenty-five  percent  (25%) of the sum of the
      operation and maintenance expenses actually charged to Purchaser.  For any
      well  without an operating  agreement,  Seller  agrees to charge  expenses
      consistent  with the Ernst & Young rate schedule  published for use in the
      oil and gas industry.

            (b) Purchaser will take all necessary steps to ensure that Purchaser
      is  recognized  as the owner and, if elected,  Operator of the Property by
      all appropriate  parties,  including any regulatory  commission,  body, or
      board  with  jurisdiction.  If Seller is the  principal  on any  financial
      assurance  (including a bond)  relating to the Property,  which  financial
      assurance is required by any law, rule or regulation,  then Purchaser will
      secure replacement  financial assurance in the required amount and deliver
      it to the  regulatory  body  requiring  such  assurance,  to the end  that
      Seller's financial assurance is released and discharged.

            (c)  Seller   may  either   remove  its  name  and  signs  from  the
      Seller-operated  Property or require  Purchaser to do so. Purchaser grants
      Seller a right of access to the Property to remove Seller's signs and name
      from all wells,  facilities  and Leases,  or to confirm that Purchaser has
      done so. If Seller's name or signs remain on the Property  after  closing,
      Purchaser  will promptly,  but no later than required by applicable  rules
      and  regulations  or  forty-five  (45) days after  closing,  whichever  is
      earlier,  remove all remaining signs and references to Seller and erect or
      install signs complying with applicable rules and  regulations,  including
      signs showing the Purchaser as Operator of the Property.

      31.  Securities  Laws.  The  solicitation  of  offers  and the sale of the
Property by Seller have not been registered under any securities laws. Purchaser
represents that at no time has it been presented with or solicited by or through
any  public  promotion  or any  form of  advertising  in  connection  with  this
transaction.  Purchaser  represents  that it intends to acquire the Property for
its own benefit and account and that it is not  acquiring  the Property with the
intent of

<PAGE>




distributing fractional, undivided interests that would be subject to regulation
by  federal  or state  securities  laws,  and that if it  sells,  transfers,  or
otherwise disposes of the Property or fractional,  undivided interests,  it will
do so in compliance with applicable federal and state securities laws.

      32. Due Diligence.  Purchaser  represents  that it has performed,  or will
perform prior to closing,  sufficient  review and due diligence  with respect to
the Property,  which includes  reviewing well data,  title, and other files, and
performing  necessary  evaluations,  assessments,  and other  tasks  involved in
evaluating the Property, to satisfy its requirements completely and to enable it
to make an informed  decision to acquire  the  Property  under the terms of this
Agreement.

      33. Basis of Purchaser's Decision.  Purchaser represents that by reason of
its knowledge and experience in the  evaluation,  acquisition,  and operation of
oil and gas  properties,  Purchaser  has  evaluated  the  merits  and  risks  of
purchasing  the Property  from Seller and has formed an opinion  based solely on
Purchaser's   knowledge  and  experience  and  not  on  any  representations  or
warranties by Seller.  Purchaser  represents that it has not relied and will not
rely on any statements by Seller or its  Representatives  in making its decision
to enter into this Agreement or to close this transaction.

      34. Press  Release.  Prior to closing,  there shall be no press release or
public  communication  concerning this purchase and sale by either party, except
as required by law or with the written consent of the party not originating said
release or communication. Prior to closing, the parties will endeavor to consult
each other in a timely manner on all press releases required by law.

      35.  Partial  Invalidity.  In the event any one or more of the  provisions
contained in this Agreement or in any other  document  referred to herein shall,
for any reason, be held to be invalid,  illegal or unenforceable in any respect,
such  invalidity,  illegality  or  unenforceability  shall not  affect any other
provision of this Agreement or any other such document.

      36. Time of Essence.  Time shall be of the essence in the performance by 
the parties of all of the provisions of this Agreement.

      37.  Assignment -  Successors  and Assigns.  This  Agreement  shall not be
assigned,  transferred or encumbered,  in whole or in part, by Purchaser without
the prior  written  consent of Seller,  which may be  withheld  for any  reason.
Subject to the foregoing,  this Agreement shall be binding upon, and shall inure
to the benefit of,  Seller and  Purchaser and their  respective  successors  and
assigns.

      38.  Governing Law.  To the extent allowed by the jurisdiction in which 
any portion of the Property is located, the provisions of this Agreement, and 
all of the rights, obligations and

<PAGE>




remedies of Seller and Purchaser under this Agreement, shall be governed by, and
shall be construed, interpreted and enforced in accordance with, the laws of the
State of New Mexico.

      39. Entire  Agreement - Amendment.  This Agreement  constitutes the entire
agreement  of Seller and  Purchaser,  and  supersedes  and  replaces any and all
communications,  representations and agreements  previously or contemporaneously
made by Seller or  Purchaser.  This  agreement may only be modified by a writing
executed by both Seller and Purchaser.

      40.  Merger of Title -  Survival  of  Covenants.  The  provisions  of this
Agreement shall not be merged into any assignment,  conveyance or other document
executed  and  delivered  pursuant  hereto,  and shall  remain in full force and
effect after the execution and delivery of any document required or contemplated
by this  Agreement.  All covenants,  representations,  warranties and agreements
contained  in this  Agreement  shall  survive  the  closing  of the  transaction
contemplated by this  Agreement.  This provision does not apply to Sections 6(e)
through 6(aa),  inclusive,  or to Sections 8(a) through 8(h),  inclusive,  which
representations and covenants shall not survive the closing.

      41.  Counterparts.  This Agreement may be executed in separate or multiple
counterparts.  Each such counterpart shall be deemed to be an original and shall
be binding upon the parties executing the same, and all such counterparts 
together shall constitute one and the same document.

      42.  Headings.  The headings of the paragraphs contained in this Agreement
are inserted for convenience of reference only.  Such headings are not intended
to be, and shall not be, a part of this Agreement, nor shall they affect the 
meaning or interpretation of this Agreement.

                              SELLER:

                              SIETE OIL & GAS CORPORATION


                              By  /S/ Gene Shumate
                                  President


                              OLYMPIC TRADING AND TRANSPORTATION, INC.


                              By  /S/ Gene Shumate
                                  President

<PAGE>





                              PURCHASER:

                              ST. MARY LAND & EXPLORATION COMPANY
ATTEST:


___________________________   By  /S/ Milam Randolph Pharo
                                  Vice President - Land

                              RIVERHILL ENERGY CORPORATION
ATTEST:


____________________________  By  /S/ J.W. Ramsey 
                                  Vice President - Exploitation


STATE OF New Mexico           )
                              ) ss.
COUNTY OF Chaves              )

            This instrument was acknowledged before me on April 10,  1996,
by  Gene Shumate,  as  President  of Siete  Oil & Gas Corporation.


                                    /S/ Carol A. Parker
                                    Notary Public
My Commission Expires:
     11/12/99

<PAGE>



STATE OF New Mexico           )
                              ) ss.
COUNTY OF Chaves              )

            This instrument was acknowledged before me on April 10, 1996,
by Gene Shumate, as President of Olympic Trading and Transportation, Inc.


My Commission Expires:                             /S/ Carol A. Parker
       11/12/99                                      Notary Public



STATE OF New Mexico           )
                              ) ss.
COUNTY OF Chaves              )

            This instrument was acknowledged before me on April 10, 1996, 
by Milam Randolph Pharo, as Vice President of St. Mary Land & 
Exploration Company.


                                                   /S/ Carol A. Parker
My Commission Expires:                                Notary Public
       11/12/99

STATE OF New Mexico           )
                              ) ss.
COUNTY OF Chaves              )

            This instrument was acknowledged before me on April 10,  1996,
by  J.W. Ramsey,  as  Vice President  of  Riverhill  Energy Corporation.


My Commission Expires:                  /S/ Carol A. Parker
       11/12/99                            Notary Public


<PAGE>








                                  May 31, 1996






Siete Oil & Gas Corporation             Olympic Trading and Transportation, Inc.
P.O. Box 2523                           P.O. Box 2523
Roswell, NM  88202-2523                 Roswell, NM  88202-2523

Riverhill Energy Corporation
200 North Loraine, Suite 1100
P.O. Box 2726
Midland, TX  79702-2726


                                    Re:   Title Defect Resolution and Closing
                                          Pursuant to that certain Purchase
                                          and Sale Agreement dated April 2,
                                          1996

Gentlemen:

      This letter will confirm our agreement and understanding that for valuable
consideration,  the receipt of which is  acknowledged  by the  undersigned,  the
undersigned agree that the transaction contemplated by that certain Purchase and
Sale Agreement dated April 2, 1996, by and between Siete Oil & Gas  Corporation,
Olympic  Trading  and  Transportation,  Inc.,  as  "Seller"  and St. Mary Land &
Exploration  Company and Riverhill  Energy  Corporation,  as  "Purchaser",  (the
"Agreement")  will not close on June 4, 1996,  as  provided in Section 20 of the
Agreement.  Rather,  the  undersigned  parties agree that they shall meet in the
offices of Coastal  Management  Corporation in Midland,  Texas,  at 1:30 p.m. on
Thursday,  June 6, 1996,  and to resolve the  existence and treatment of claimed
Title  Defects as defined by Section 11 of the  Agreement,  all as prescribed in
Section 13 of the Agreement.

      In addition, the undersigned parties agree that at this meeting, they will
mutually  agree on a new date for  closing  which  will  take into  account  the
matters to be resolved at this  meeting,  but which date for closing shall in no
event be later  than June 27,  1996,  subject  to  Seller's  right to cure Title
Defects  pursuant  to  and  within  the  time  permitted  by  Section  13 of the
Agreement.

      The undersigned  parties agree that this letter  agreement can be executed
by  facsimile  with  an  executed  original  to be  furnished  to  each  of  the
undersigned parties.

<PAGE>

Siete Oil & Gas Corporation, et al.
May 31, 1996
Page 2




      If this  letter  properly  sets forth your  understanding  and  agreement,
please so indicate by signing in the space provided below.

                                    Very truly yours,

                                    ST. MARY LAND & EXPLORATION COMPANY


                                    /S/ Milam Randolph Pharo

                                    Milam Randolph Pharo
                                    Vice President - Land



      ACCEPTED AND AGREED TO this  31   day of  May , 1996.                    
      

RIVERHILL ENERGY CORPORATION                    SIETE OIL & GAS CORPORATION



By:   /S/ J.W. Ramsey                           By:    /S/ Gene Shumate
      J.W. Ramsey                                      Gene Shumate
      Vice President - Exploration                     President



OLYMPIC TRADING AND TRANSPORTATION, INC.



By:   /S/ Gene Shumate
      Gene Shumate
      President



cc:   Mr. John Nelson
      Mr. John Knight

p:\mrp\closeltr.doc

<PAGE>








                                  June 21, 1996






Siete Oil & Gas Corporation             Olympic Trading and Transportation, Inc.
P.O. Box 2523                           P.O. Box 2523
Roswell, NM  88202-2523                 Roswell, NM  88202-2523

Riverhill Energy Corporation
200 North Loraine, Suite 1100
P.O. Box 2726
Midland, TX  79702-2726


                                    Re:   Title Defect Resolution and Closing
                                          Pursuant to that certain Purchase
                                          and Sale Agreement dated April 2,
                                          1996

Gentlemen:

      This  letter  will  confirm  our  agreement  and  understanding  that  the
undersigned  parties agree to adjust the Purchase  Price as that term is defined
in the  above-referenced  agreement  and  proceed  to  closing  the  transaction
contemplated  by the Purchase and Sale Agreement dated April 2, 1996 (the "PSA")
as follows:

      1. By its letter  dated May 20, 1996,  Purchaser  gave notice to Seller of
various claimed Title Defects which included Environmental Defects in accordance
with Section 13 of the PSA. Seller responded to this notice by its letter of May
29, 1996. In accordance with Section 13.b. of the PSA, Seller and Purchaser have
negotiated  a  downward  adjustment  to the  Purchase  Price  in the  amount  of
$250,000.00.  This agreed  adjustment is subject to the terms and  provisions of
this  letter  agreement,  the PSA,  and to  Seller  curing  the  matters  it has
previously  indicated it will cure.  However, as to Title Defects that Purchaser
raised or should have raised  pursuant to the PSA, it is agreed that  subject to
the  above-referenced  items,  this is the final price  adjustment for all Title
Defects.

      2. In determining the $250,000.00  downward price  adjustment noted in the
preceding paragraph,  Seller and Purchaser  tentatively agreed that the downward
Purchase Price adjustment  relating to the Parkway Unit gas  overproduction  was
$17,730.00.  Seller and Purchaser agree that this gas overproduction value shall
be adjusted  either upward or downward,  as  appropriate,  to reflect the actual
Parkway gas  balancing  on the basis of an equation  of  overproduced  volumes x
$1.75 per MMBTU.

      3. Robert Lee will  prepare the SPCC  documentation  for both the Zuni and
Rock Pen  Fields and the  Purchaser  will be  responsible  for  construction  or
enhancement of any dikes required to comply with such permits.

<PAGE>

Siete Oil & Gas Corporation, et al.
June 21, 1996
Page 2



      4. Subject to Seller's 60-day right to cure which was previously  invoked,
Seller will continue to work to satisfy the title requirements it agreed to cure
as a result of the June 6, 1996,  meeting  between Seller and  Purchaser.  Those
requirements include, but are not limited to, the ratifications for the Rock Pen
and Zuni  Units.  Seller will also  provide  ratifications  and  joinders of the
Parkway Unit by Tom Campbell and Gene Shumate and their respective spouses.

      5. Seller and Purchaser agree that  notwithstanding  the fact that certain
issues  regarding  the Blackhawk  water  disposal  facility have been  discussed
between these parties,  that should any third party such as the landowner or any
governmental  entity make a claim,  institute  litigation,  or issue any sort of
citation,  noncompliance  certificate,  or request or demand that remediation or
restoration  work be  performed  at the  Blackhawk  site,  and such claim occurs
within the one (1) year period contemplated by the environmental  escrow account
provision  contained  in Section 24 of the PSA,  that  Seller  agrees  that this
Blackhawk  area will  remain  subject to this  Section  24, and Seller  will not
assert that  Purchaser  has waived any right it otherwise has under this Section
24 to seek the use of the escrowed funds to satisfy such third party claim.

      Notwithstanding  the provisions of Section 24 of the PSA,  Purchaser shall
not be entitled to invoke this Section 24 with  respect to the disposal  pits or
overflow pits at the Blackhawk area unless, during said one-year period, a third
party  makes a claim,  institutes  litigation,  or issues any sort of  citation,
noncompliance certificate,  or request or demand that remediation or restoration
work be  performed  with respect to such pits.  In  addition,  execution of this
letter agreement by Seller is not, and shall not be construed as an admission or
agreement by Seller that a Condition  existed with respect to the Blackhawk area
as of the Effective Date.

      6.    To  clarify a portion  of the  mechanics  of  Closing,  Seller and
Purchase agree as follows:

            (a) To the extent  necessary,  the  instructions to the Escrow Agent
      will be  amended  to  provide  that upon  Purchaser  paying  the  Adjusted
      Purchase Price to the Escrow Agent,  the Escrow Agent will pay directly to
      the  holder of any Siete  Lien who has  furnished  a release to the Escrow
      Agent, the amount required for the satisfaction of such Siete Lien so that
      the release can be delivered to Purchaser.

            (b) In addition,  the Escrow Agent shall retain the amount set forth
      on  Exhibits  A and A-1  attached  hereto  and made a part  hereof,  which
      exhibits,  in the  aggregate  and to the extent they do not  constitute  a
      Siete Lien, reflect the "Designated Claims" of various creditors of Seller
      which shall be paid to Siete or the respective  claimant,  as appropriate,
      upon the earlier to occur of either (i) Siete provides evidence reasonably
      satisfactory to the Escrow Agent (such as a certificate or letter from the
      appropriate  claimant) that the claim of any particular claimant listed as
      having a Designated  Claim shall have been resolved whether for a greater,
      lesser,  or equal  amount  than that  listed on Exhibits A or A-1, or (ii)
      September 2, 1996, shall have arrived without a particular claim listed on
      Exhibits A or A-1 being resolved,  in which event,  the Escrow Agent shall

<PAGE>

Siete Oil & Gas Corporation, et al.
June 21, 1996
Page 3
      

      deliver  payment for and on behalf of this  particular  claim  directly to
      such claimant in the amount set forth on Exhibit A or A-1.

      In  accordance  with the terms of the PSA,  the  Escrow  Agent  shall also
retain  a  portion  of the  Adjusted  Purchase  Price  equal  to the  amount  of
unreleased  Siete Liens.  These sums shall be released to each individual  Siete
Lien holder at such time as this third  party  provides a release of its lien to
the Escrow Agent.

      Seller and  Purchaser  agree to keep the terms of this escrow  arrangement
confidential  so as to not  jeopardize  Seller's right to resolve both the Siete
Liens and the  Designated  Claims.  Upon  Closing,  all other sums not otherwise
required to be retained by the Escrow Agent in accordance  with either the terms
of the PSA, this letter agreement,  or the previously  drafted Escrow Agreement,
shall be released to Seller or Chemical Bank, as they may direct.

      While it is understood  and believed that these  Exhibits A and A-1 are in
final form, Purchaser has accepted the amounts and claimants supplied by Seller,
and the parties  agree that these amounts and claimants may change to accurately
reflect  the  unsecured  claims  in  excess  of  $10,000.00  after   Purchaser's
accounting representative has met with Seller on June 24 or June 25, 1996.

      7. The parties agree that  Purchaser  shall take over  Seller's  duties as
operator at 7:00 a.m., July 1, 1996, at the location of the properties.

      8.  Capitalized  terms used in this  letter  agreement,  but which are not
otherwise defined, shall have the meaning ascribed to such terms in the PSA.

      Except as  specifically  set forth in this  letter,  the parties  agree to
proceed to Closing on June 28, 1996,  at 9:00 a.m.,  in Midland,  Texas,  at the
office of the Escrow Agent, as provided and in accordance with the terms of that
certain Purchase and Sale Agreement between these parties dated April 2, 1996.

      If this  letter  properly  sets forth your  understanding  and  agreement,
please so indicate by signing in the space provided below.


                                    Very truly yours,

                                    ST. MARY LAND & EXPLORATION COMPANY


                                    /S/ Milam Randolph Pharo

                                    Milam Randolph Pharo
                                    Vice President - Land

<PAGE>

Siete Oil & Gas Corporation, et al.
June 21, 1996
Page 4



      ACCEPTED AND AGREED TO this  27  day of   June  , 1996.


RIVERHILL ENERGY CORPORATION              SIETE OIL & GAS CORPORATION


By:  /S/ J.W. Ramsey                      By:    /S/ Gene Shumate
     J.W. Ramsey                                 Gene Shumate
     Vice President - Exploitation               President



OLYMPIC TRADING AND TRANSPORTATION, INC.


By:   /S/ Gene Shumate
      Gene Shumate
      President



cc:   Mr. John Nelson
      Mr. John Knight


p:\mrp\amdclltr.doc

<PAGE>







June 28, 1996



Siete Oil & Gas Corporation         Olympic Trading and Transportation, Inc.
Post Office Box 2523                Post Office Box 2523
Roswell, NM  88202-2523             Roswell, NM  88202-2523

St. Mary Land & Exploration Company
1776 Lincoln Street, Suite 1100
Denver, Colorado 80203



RE:   Amended Exhibits A and A-1


Gentlemen:

      This  letter  will  confirm  our  agreement  and  understanding  that  the
undersigned  parties to that certain  Purchase and Sale Agreement dated April 2,
1996 (the  "PSA"),  have  determined  through the course of due  diligence  that
certain  changes should be made to Exhibits A and A-1 as originally  attached to
the PSA.

      Therefore  the undersigned  agree that the PSA shall be amended to delete
the Exhibits A and A-1 originally attached thereto and those exhibits are hereby
replaced  and  superseded  with and by the  Exhibits A and A-1  attached to this
amendment letter.

      If this  letter  properly  sets forth your  understanding  and  agreement,
please so indicate by signing in the space provided below.

                              Very truly yours,

                              RIVERHILL ENERGY CORPORATION

                              /S/ J.W. Ramsey

                              J. W. Ramsey
                              Vice President, Exploitation

c:\johnb\amendexh.ltr




<PAGE>


Siete Oil and Gas Corporation, et. al.
June 28, 1996
Page 2


      ACCEPTED AND AGREED TO this 28th day of June, 1996.


SIETE OIL & GAS CORPORATION


By:   /S/ Gene Shumate
      Gene Shumate, President


OLYMPIC TRADING AND TRANSPORTATION, INC.


By:   /S/ Gene Shumate
      Gene Shumate, President


ST. MARY LAND & EXPLORATION COMPANY


By:   /S/ Milam Randolph Pharo
      Milam Randolph Pharo



c:\johnb\amendexh.ltr






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