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                                    AGREEMENT

                         dated as of September 30, 1998

                                  BY AND AMONG

                   PEABODY NATURAL RESOURCES COMPANY ("PNRC"),
                         a Delaware general partnership,

                        GALLO FINANCE COMPANY ("Gallo"),
                           a Delaware corporation and

                         CHACO ENERGY COMPANY ("Chaco"),
                            a New Mexico corporation






iii


                                      INDEX

Section                                                                  Page

         RECITALS                                                          1
1        Sale and Purchase of the Assets
1.1      Assets                                                            2
1.2      Closing Date                                                      2
1.3      Disclaimer of Warranties                                          2
2        Prepayment of Advance Royalties and Purchase Price; Payment of 
         Net Payment
2.1      Prepayment of Advance Royalties                                   3
2.2      Adjustment to Net Payment                                         4
2.3      Payment at Closing                                                4
3        Representations and Warranties
3.1      Chaco's Representations and Warranties                            5
3.2      Gallo's and PNRC's Representations and Warranties                 9
4        Due Diligence                                                    11
5        Covenants of Chaco
5.1      Conduct of Business Pending Closing                              12
5.2      Access                                                           12
5.3      Certain Electric Power Options                                   13
5.4      Consents Not Obtained                                            13
5.5      Delivery and Maintenance of Records                              13
5.6      No Liquidation, Dissolution or Bankruptcy                        14

6        Conditions Precedent
6.1      Gallo's and PNRC's Conditions                                    14
6.2      Chaco's Conditions                                               15
7        Closing
7.1      The Closing                                                      16
7.2      Documents to be Delivered at Closing                             16
7.3      Execution of Assignment, Notice, and Transfer Documents          17

7.4      Payment of Net Payment                                           17
8        Assumptions by Gallo                                             17
9        Tax Prorations                                                   18
10       Termination
10.1     Termination Events                                               19
10.2     Effect of Termination                                            19
11       Survival, Indemnification and Liability
11.1     Survival                                                         19
11.2     Gallo's and PNRC's Indemnification                               19
11.3     Chaco's Indemnification                                          20
11. 4    Release and Covenant Not to Sue by Gallo and PNRC                20
11.5     Release and Covenant Not to Sue by Chaco                         21
11.6     Limitation of Liability                                          21
12       Further Assurances                                               21
13       Access to Records by Chaco                                       22
14       Notices                                                          22
15       Assignment                                                       22
16       Governing Law                                                    23
17       Expenses and Fees                                                23
18       Integration                                                      23
19       Modification                                                     23
20       Independent Investigation                                        23
21       Multiple Originals                                               24
22       Announcements                                                    24
23       Negotiation of Agreement                                         25






               EXHIBITS, ATTACHMENTS AND SCHEDULES


EXHIBIT A      Schedule of Contracts
EXHIBIT B      Description of Properties
EXHIBIT C      Description of Other Interests
ATTACHMENT I   Assignment, Conveyance, Assumption, Consent And Release Agreement
ATTACHMENT II  Special Warranty Deed





2

                                    AGREEMENT

     THIS  AGREEMENT  ("Agreement")  is made  effective  as of the  30th  day of
September,  1998 (the  "Effective  Date")  between Chaco Energy  Company,  a New
Mexico  corporation  ("Chaco"),  Peabody Natural Resources  Company,  a Delaware
general partnership  (formerly called Hanson Natural Resources Company) ("PNRC")
and Gallo  Finance  Company,  a Delaware  corporation  and an  affiliate of PNRC
("Gallo").  Chaco,  PNRC and Gallo will be individually  referred to herein as a
"Party" and collectively as the "Parties."

                                    RECITALS:

     WHEREAS,  Chaco is the lessee  under  that  certain  Coal  Lease  dated and
effective as of April 15, 1977 from Hospah Coal Company, as lessor, to Chaco, as
amended by  Modification  No. 1 dated February 12, 1981, as amended and restated
by Modification  No. 2 effective as of February 28, 1990, and as further amended
by Amendment  To Coal Lease dated June 25, 1993 (the Coal Lease,  as so amended,
being  referred to in this  Agreement  as the  "Lease");  Memoranda of the Lease
being  recorded  with the Clerk of  McKinley  County,  New  Mexico in Book 47 of
Leases,  Pages 338 through 342; in Book 52 of Leases, Pages 302 through 305; and
in Book 1 COMP, Pages 6051 through 6054; and

     WHEREAS,  PNRC has succeeded to the rights of Hospah Coal Company as lessor
under the  Lease;  and  WHEREAS,  Chaco is a  wholly-owned  subsidiary  of Texas
Utilities  Company ("TUC"),  which assured the performance of certain of Chaco's
obligations  under the Lease pursuant to that surety  agreement  dated April 15,
1977, as amended and restated by Amended and Restated Surety Agreement effective
February  28, 1990  between TUC and Hospah Coal  Company  (the  original  surety
agreement,  as amended and restated,  being referred to in this Agreement as the
"Surety Agreement"); and

     WHEREAS,  Chaco  wishes to prepay the net  present  value of all  remaining
advance  royalties  that may become  payable  under the Lease and PNRC wishes to
accept such payment; and

     WHEREAS,  Gallo wishes to acquire from Chaco and to assume all  obligations
and  liabilities  on or after the Closing Date with respect to, and Chaco wishes
to assign to Gallo,  all of Chaco's  interest  in: (i) the Lease,  (ii)  certain
related contracts and (iii) certain related  properties in McKinley County,  New
Mexico;  and  Gallo and PNRC wish to  release  Chaco and TUC from:  (a) all such
obligations  and  liabilities   relating  to  the  Lease,  the  contracts,   the
properties; and (b) the Surety Agreement, as hereinafter described.

     NOW, THEREFORE, in consideration of the premises,  together with other good
and  valuable   consideration,   the  receipt  and   sufficiency  of  which  are
acknowledged by all Parties, Chaco, PNRC and Gallo agree as follows:

1. Sale and Purchase of the Assets.

          1.1 Assets.  Subject to the terms and  conditions  in this  Agreement,
     Chaco agrees to sell, assign, convey and deliver to Gallo, and Gallo agrees
     to accept and receive and to pay $27,500,000.00 (the "Purchase Price") for,
     all  of  Chaco's  interest  in  and to  the  following  (collectively,  the
     "Assets"):

               1.1.1 the Lease;

               1.1.2 the  contracts  (the  "Contracts")  described  in Exhibit A
          attached to and made a part of this Agreement;

               1.1.3 certain  surface lands,  oil, gas, coal,  mineral and other
          interests in McKinley County, New Mexico (the "Properties"), which are
          described in Exhibit B attached to and made a part of this  Agreement;
          and

               1.1.4   certain  coal  leases  and  rights  of  way  (the  "Other
          Interests"),  which are  described in Exhibit C attached to and made a
          part of this Agreement.

          1.2 Closing Date.  The transfer of the Assets from Chaco to Gallo will
     occur and be effective at the date of Closing (the "Closing Date").

          1.3 Disclaimer of Warranties. Except as specifically set forth in this
     Agreement and the  Assignment  (which is described in Section  7.2.1),  the
     Deed (which is described  in Section  7.2.3),  and the  Transfer  Documents
     (which are described in Section 7.2.4), the Assets will be conveyed without
     warranties  of any  kind  and  EXCEPT  TO THE  EXTENT  SET  FORTH  IN  THIS
     AGREEMENT,  THE  ASSIGNMENT,  THE DEED,  AND THE TRANSFER  DOCUMENTS TO THE
     CONTRARY,  CHACO  EXPRESSLY  DISCLAIMS ALL  WARRANTIES OF ANY KIND,  EITHER
     STATUTORY,  EXPRESS OR  IMPLIED,  WITH  RESPECT TO THE  ASSETS,  INCLUDING,
     WITHOUT  LIMITATION,   THE  DISCLAIMER  OF  ANY  WARRANTIES  AS  TO  TITLE,
     HABITABILITY,  MERCHANTABILITY,  FITNESS FOR A PARTICULAR  PURPOSE,  OR THE
     PRESENCE OF COAL ON THE LEASED  PREMISES,  AND ASSIGNEE  ACCEPTS THE ASSETS
     "WITH ALL FAULTS,"  "AS-IS," WITHOUT ANY WARRANTIES OF ANY KIND AND WITHOUT
     REPRESENTATION  OR  WARRANTY  BY CHACO  WITH  REGARD  TO  PHYSICAL  DEFECTS
     (WHETHER LATENT OR PATENT).

2. Prepayment of Advance Royalties and Purchase Price; Payment of Net Payment.

          2.1 Prepayment of Advance Royalties. At Closing, subject to adjustment
     as provided in Section 2.2 and the offset of the Purchase Price as provided
     in Section 2.3, Chaco will pay to PNRC the "Advance Royalty  Prepayment" in
     the amount of  $163,402,961.00,  which is the amount that the Parties agree
     is the net  present  value on  September  30,  1998 of the  future  advance
     royalties payable under the Lease,  calculated based on an interest rate of
     8.1% per annum.

          2.2 Adjustment to Net Payment.  If Closing does not occur on September
     30, 1998, the Advance Royalty Prepayment will be adjusted as follows:

               2.2.1 if Closing  occurs before  September 30, 1998,  the Advance
          Royalty  Prepayment  (i.e.,  the  amount of  $163,402,961.00)  will be
          reduced by an amount equal to  $36,262.03  multiplied by the number of
          days  between  the  Closing  Date  (including  the  Closing  Date) and
          September 30, 1998; and

               2.2.2 if Closing  occurs after  September  30, 1998,  the Advance
          Royalty  Prepayment  (i.e.,  the  amount of  $163,402,961.00)  will be
          increased by an amount equal to $36,262.03 multiplied by the number of
          days between  September 30, 1998 and the Closing Date  (including  the
          Closing Date).

          2.3  Payment  at  Closing.  At  Closing,  Chaco  will pay PNRC by wire
     transfer in immediately  available  funds the "Net  Payment,"  which is the
     amount of the Advance  Royalty  Prepayment (as adjusted in accordance  with
     Section 2.2) offset and reduced by the amount of the  Purchase  Price to be
     paid to Chaco by Gallo.  PNRC and Gallo have made appropriate  arrangements
     between  themselves so that such netting may occur.  The Net Payment amount
     will be $135,902,961.00, if no adjustment is required under Section 2.2.

3. Representations and Warranties.

          3.1 Chaco's  Representations  and  Warranties.  Chaco  represents  and
     warrants to Gallo and PNRC as follows:

               3.1.1 Authority and Enforceability.  Chaco is a corporation, duly
          formed,  validly existing,  and in good standing under the laws of the
          State of New Mexico.  Chaco has full power and authority to enter into
          this  Agreement,  the Deed and the related  instruments and agreements
          pursuant  hereto  (the  "Related  Instruments")  and  to  perform  its
          obligations   under  this   Agreement,   the  Deed  and  the   Related
          Instruments.   The  execution,   delivery  and   performance  of  this
          Agreement, the Deed and the Related Instruments by Chaco has been duly
          and validly  authorized by all requisite  action on the part of Chaco.
          This Agreement has been duly executed and delivered on behalf of Chaco
          and  constitutes,  and the  Deed  and the  Related  Instruments,  when
          executed and delivered on behalf of Chaco, will constitute, the legal,
          valid and binding obligations of Chaco, enforceable in accordance with
          their terms,  except as  enforceability  may be limited by  applicable
          bankruptcy,   reorganization   or   moratorium   statutes,   equitable
          principles  or other  similar  laws  affecting  Chaco or the rights of
          creditors generally.

               3.1.2 Litigation and Claims.  (a) Chaco has received no notice of
          any pending claim,  demand,  filing,  cause of action,  administrative
          proceeding, lawsuit or other litigation, and (b) to the best knowledge
          of  Chaco  there  is  no  claim,  demand,  filing,  cause  of  action,
          administrative  proceeding,  lawsuit or other litigation,  threatened,
          that in either case (a) or (b) would  reasonably  be expected  to: (i)
          adversely  affect the  consummation  of this  transaction by Chaco; or
          (ii) adversely  affect the ownership or operation of any of the Assets
          to a material  extent,  other than  proceedings  relating  to the coal
          mining industry generally and as to which Chaco is not a named party.

               3.1.3 No Violation. This Agreement and the execution and delivery
          hereof by Chaco do not, and the fulfillment of and compliance with the
          terms and conditions  hereof and the  consummation of the transactions
          contemplated hereby will not:

                    3.1.3.1  Violate  or  conflict  with  any  provision  of the
               certificate of incorporation or bylaws,  each as amended to date,
               of Chaco;

                    3.1.3.2 To the best knowledge of Chaco,  violate or conflict
               with or require any consent,  authorization or approval under any
               provision  of  any  law  or  administrative   regulation  or  any
               judicial,  administrative or arbitration order, award,  judgment,
               writ, injunction or decree applicable to or binding upon Chaco;

                    3.1.3.3  Result in a breach  of,  constitute  a  default  or
               violation under (whether with notice or lapse of time or both) or
               require  any  consent,   authorization   or  approval  under  any
               mortgage,  indenture,  loan  or  credit  agreement  or any  other
               agreement  or  instrument   evidencing   indebtedness  for  money
               borrowed  to  which  Chaco  is a  party  or by  which  any of its
               properties or assets is bound;

                    3.1.3.4  Except with respect to the Other  Interests or that
               appear of record, require any consent,  authorization or approval
               by any other  third  party  with  respect to which the Assets are
               bound; or

                    3.1.3.5  Result in the creation or  imposition  of any lien,
               charge, security interest or other encumbrance upon the Assets.

               3.1.4 Compliance with Laws and Regulations. To the best knowledge
          of Chaco,  Chaco's  ownership of the Assets is in compliance  with all
          applicable  laws,  regulations,  orders,  judgments  or decrees of any
          Governmental  Authority having  jurisdiction over the Assets.  For the
          purposes of this Agreement,  "Governmental  Authority"  shall mean the
          United  States of  America,  any  state,  commonwealth,  territory  or
          possession thereof and any tribe, and any political subdivision of any
          of the foregoing,  including, but not limited to, courts, departments,
          commissions, boards, bureaus, agencies or other instrumentalities.

               3.1.5 Taxes.  All taxes,  assessments and charges by Governmental
          Authorities  which are currently due and payable by Chaco with respect
          to the Assets have been paid.

               3.1.6 Environmental.

                    3.1.6.1 For the purposes of this  Agreement,  "Environmental
               Laws" shall mean  federal,  state or  municipal  laws,  rules and
               regulations governing, regulating or relating to pollution or the
               protection of the environment, including, but not limited to, the
               Resource  Conservation and Recovery Act of 1976, as amended,  the
               Comprehensive Environmental Response, Compensation, and Liability
               Act  of  1980,   as  amended,   the  Superfund   Amendments   and
               Reauthorization  Act of 1986, as amended,  and all similar state,
               municipal and local laws, ordinances, rules, regulations, orders,
               directives,  determinations and requirements each as in effect on
               the Effective Date for purposes of the  representations  given on
               the  Effective  Date and as in effect on the Closing Date for all
               other purposes of this Agreement;

                    3.1.6.2  Chaco  has not  received  written  notice  from any
               Governmental  Authority of any unresolved violation of or pending
               or threatened action, suit, inquiry,  proceeding or investigation
               relating to any Environmental Law applicable to the Assets; and

                    3.1.6.3  Chaco has not  received any  currently  outstanding
               written  notice from any  Governmental  Authority  of any license
               required  under  any   Environmental   Law  or  legally  required
               environmental  removal,  remediation or clean-up  obligation with
               respect to the Assets.

               3.1.7  Contracts;  No Notice of Contract  Breach.  The  Contracts
          listed in Exhibit A hereto are, to the best knowledge of Chaco, all of
          the contracts to which Chaco is a party which in any way relate to the
          Lease, the Properties,  or the Other Interests; such Contracts, to the
          best knowledge of Chaco,  are in full force and effect;  and Chaco has
          not received any notice,  whether written or, to the best knowledge of
          Chaco,  oral,  of any  breach  of any of the  Contracts  by any  party
          thereto.

               3.1.8 Properties;  Encumbrances. The Properties listed in Exhibit
          B hereto are all of the  properties of Chaco in McKinley  County,  New
          Mexico,  which in any way relate to the Lease,  the Contracts,  or the
          Other   Interests.   Chaco  has  disclosed  to  Gallo  all  unrecorded
          mortgages,  liens,  charges,  security  interests,  overriding royalty
          interests or other encumbrances on the Assets. No adverse title claims
          are pending or, to the knowledge of Chaco, threatened, with respect to
          any portion of the Assets, which are not of record.

               3.1.9 No Third Party  Options.  To the best  knowledge  of Chaco,
          there are no unrecorded existing agreements,  options, commitments, or
          rights with or to any person to acquire  any of the Assets,  except as
          are referenced in any exhibits to this Agreement.

               3.1.10  Funds  Available.  Chaco has, or will have on the Closing
          Date,  sufficient cash,  available lines of credit or other sources of
          immediately available funds to enable it to pay the Net Payment.

               3.1.11 Mining Permits.  Chaco  represents and warrants that there
          are no mining  permits  currently in effect with respect to any of the
          Assets.

               3.1.12  Chaco's  Assets.  Chaco  represents and warrants that the
          Assets being conveyed  constitute all or substantially  all of Chaco's
          assets.

               3.1.13  Surface  Transportation  Board.  To the  best of  Chaco's
          knowledge,   Chaco   represents  and  warrants  that  Chaco  holds  no
          certificates or permits from the Federal Surface Transportation Board.

               3.1.14 Rail Facilities  Agreement.  Chaco represents and warrants
          that it has not modified or amended,  and has not knowingly  waived or
          relinquished,  any of its rights under the Amended and  Restated  Rail
          Facilities  Agreement  identified  on  Exhibit  A  hereto,  including,
          without  limitation,  the right (if  certain  events  occur or fail to
          occur as  specified)  to  receive  certain  payments  from  Star  Lake
          Railroad Company  pursuant to Section 3.2(b) thereof.  3.2 Gallo's and
          PNRC's  Representations  and Warranties.  Gallo and PNRC represent and
          warrant to Chaco as follows: 3.2.1 Authority and Enforceability. Gallo
          is a corporation,  duly formed, validly existing, and in good standing
          under  the  laws of the  state of  Delaware  and is  authorized  to do
          business  and in good  standing  under  the  laws of the  State of New
          Mexico. PNRC is a general partnership duly formed and validly existing
          under the laws of Delaware and is authorized to do business  under the
          laws of the State of New Mexico. Each of Gallo and PNRC has full power
          and  authority  to  enter  into  this  Agreement  and to  perform  its
          obligations  under  this  Agreement.   The  execution,   delivery  and
          performance of this Agreement and the Related Instruments by Gallo and
          PNRC has been duly and validly  authorized by all requisite  action on
          the part of Gallo and PNRC, respectively. This Agreement has been duly
          executed and  delivered  on behalf of Gallo and PNRC and  constitutes,
          and the Related Instruments,  when executed and delivered on behalf of
          Gallo  and  PNRC,  will  constitute,  the  legal,  valid  and  binding
          obligations of each of Gallo and PNRC,  enforceable in accordance with
          its terms,  except as  enforceability  may be  limited  by  applicable
          bankruptcy,   reorganization   or   moratorium   statutes,   equitable
          principles  or other  similar  laws  affecting  Gallo  and PNRC or the
          rights of creditors generally. 3.2.2 Independent Investigation.  As of
          Closing, Gallo and PNRC agree and represent that each of them: (i) has
          been  given  the  opportunity  to  conduct  complete  and  independent
          inspections  and  investigations  of the  Assets,  including,  without
          limitation,  inspections and  investigations  with respect to title to
          the Assets  and with  respect to  environmental  conditions;  (ii) has
          consummated  the  transactions  contemplated  by this Agreement on the
          basis  of its own  independent  investigation  and  inspection  of the
          physical, chemical, and environmental condition of the Assets, as well
          as on the basis of the  representations,  warranties and agreements of
          Chaco in this Agreement,  the  Assignment,  the Deed, and the Transfer
          Documents;  and (iii) with full  knowledge of the  foregoing and after
          conducting its own independent investigation and inspection, EXCEPT TO
          THE EXTENT SET FORTH IN THIS AGREEMENT, THE ASSIGNMENT,  THE DEED, AND
          THE TRANSFER DOCUMENTS, GALLO IS ACQUIRING THE ASSETS AS-IS, WHERE-IS,
          WITH ALL FAULTS.  3.2.3 Litigation and Claims. Gallo and PNRC have not
          received any notice of any pending  claim,  demand,  filing,  cause of
          action, administrative proceeding, lawsuit or other litigation, and to
          the best  knowledge  of Gallo  and PNRC,  there is no  claim,  demand,
          filing, cause of action,  administrative proceeding,  lawsuit or other
          litigation,  threatened,  that in  either  case  would  reasonably  be
          expected to adversely  affect the  consummation of this transaction by
          Gallo and PNRC,  and there are no approvals or consents  necessary for
          Gallo and PNRC to perform their  obligations  hereunder that Gallo and
          PNRC have not obtained or, unless waived by Chaco,  will not have been
          obtained prior to Closing.

4. Due Diligence.

          4.1 From the date of this  Agreement  until the  earlier  of:  one day
     prior to the date of Closing or November 7, 1998,  Gallo and PNRC will have
     the right,  subject to  consent  from  Chaco,  to:  (a)  inspect  the Lease
     premises and the Properties;  (b) to review documents or records pertaining
     to  the  Lease,  the  Contracts  and  the  Properties;  (c) to  conduct  an
     environmental  review of the Lease premises and the Properties;  and (d) to
     conduct such other  reasonable  investigations  and review of the Assets as
     Gallo and PNRC consider appropriate. Subject to Chaco's consent and subject
     to the terms of that  Confidentiality  Agreement  dated  September  8, 1998
     between Chaco and P&L Coal  Holdings,  Inc.,  Chaco will:  (i) assemble and
     make  available  at  reasonable  times  all  records,   lease   agreements,
     transportation agreements,  other documents and data related to the Assets;
     (ii) allow Gallo, PNRC and their  consultants to make physical  inspections
     of the  Lease  premises  and  Properties  at  reasonable  times;  and (iii)
     reasonably  cooperate with Gallo and PNRC's other  reasonable due diligence
     requests.

          4.2 If Gallo and PNRC  should  determine,  in their sole and  absolute
     discretion,  that the  Lease,  the  Contracts  and the  Properties  are not
     satisfactory  to Gallo or PNRC for any reason,  Gallo or PNRC may terminate
     this Agreement by delivering  written  notice of such  termination to Chaco
     one day prior to Closing. If Gallo or PNRC properly elect to terminate this
     Agreement pursuant to the terms hereof,  thereafter no Party shall have any
     further rights, liabilities or obligations hereunder.

          4.3  Should   Gallo  or  PNRC   elect  to  conduct  an   environmental
     investigation  of the  Lease  premises  or the  Properties,  a copy  of any
     written report will be furnished to Chaco  immediately upon Gallo or PNRC's
     receipt of same.

          4.4 Gallo and PNRC  shall not permit any liens to attach to any of the
     Assets by reason of the  exercise  of their  rights  under this  Agreement.
     Gallo and PNRC agree to indemnify and hold Chaco  harmless from and against
     any and all  liens  by  employees,  agents,  representatives,  contractors,
     subcontractors,  materialmen, laborers and consultants performing such work
     and tests for Gallo or PNRC and from and  against  any and all  claims  for
     damages by Chaco, by Chaco's employees,  or by third parties arising out of
     the conduct of such tests and entry upon any Chaco property.

5. Covenants of Chaco

          5.1 Conduct of Business  Pending  Closing.  Chaco covenants that, from
     the date hereof to the Closing Date,  Chaco shall: (a) deal with the Assets
     in its usual and customary  manner,  in the ordinary and regular  course of
     its  business;  and (b) not  otherwise  dispose of or  encumber  any of the
     Assets.

          5.2  Access.  From the date hereof to the  Closing  Date,  Chaco shall
     provide  Gallo and PNRC and  their  authorized  representatives  reasonable
     access to the Assets during  normal  business  hours.  Chaco shall use best
     reasonable  efforts  to  provide  accurate  and  complete  information  and
     documents, but makes no warranties or representations as to the accuracy or
     completeness of any information or documents so furnished.

          5.3  Certain  Electric  Power  Options.  Chaco  agrees  to  facilitate
     discussions between Enserch Energy Services ("EES"), an affiliate of Chaco,
     and Citizens Power LLC ("Citizens  Power"), an affiliate of Gallo and PNRC,
     concerning  a potential  agreement  granting  Citizens  Power the option to
     purchase certain electric power options in various locations,  although not
     within the state of Texas,  with the option  price and other terms to be as
     agreed in the option agreement; provided, however, the Closing of the other
     transactions  contemplated by this Agreement is not contingent upon EES and
     Citizens Power reaching any agreement.

          5.4  Consents  Not  Obtained.  To the  extent  that Chaco is unable to
     obtain  a  third  party  consent  or  approval  to  transfer  any  interest
     constituting  a part of the  Assets  and  consequently  does not  assign or
     transfer  same to Gallo,  Chaco shall  reasonably  cooperate  with Gallo in
     obtaining such consent or approval,  and shall expeditiously  transfer such
     asset to Gallo upon  obtaining  such consent or approval,  or otherwise use
     its reasonable efforts to make all benefits of such non-assigned  interests
     available  to Gallo  without any  administrative  cost to Gallo,  and Chaco
     shall not be obligated to incur any cost or expense  after the Closing with
     respect to such Assets, all of which shall be for the account of Gallo.

          5.5 Delivery and  Maintenance of Records.  As promptly as practicable,
     but in any case within 90 days after the Closing Date,  or, with respect to
     Restricted  Records,  within 90 days  after  the date that such  Restricted
     Records cease to be Restricted  Records,  Chaco will deliver or cause to be
     delivered  to Gallo to a  location  designated  by Gallo all such  Records;
     provided, however, that Chaco may retain:

               5.5.1 Originals of all accounting,  financial and tax Records for
          the Assets  attributable  to all periods  prior to the  Closing  Date;
          provided,  however,  that Chaco shall provide Gallo with copies of all
          such  accounting,  financial and tax Records that Gallo may reasonably
          request; and

               5.5.2  Copies of any other  Records  that Chaco elects to retain.
          For the purposes, of this Agreement, "Records" shall mean all existing
          financial,  accounting,  tax,  business  and other  files,  documents,
          instruments,  papers, core drilling records in electronic media format
          if  requested  by Gallo,  books,  ledgers and records  relating to the
          Assets but excluding (a) work product of legal counsel,  (b) documents
          relating  to the  negotiation  and  consummation  of the  transactions
          contemplated  by  this  Agreement,   (c)  computer  software  and  (d)
          documents whose  disclosure or transfer is prohibited or restricted by
          third party agreement, unless the necessary consent of the third party
          or parties  has been  obtained.  "Restricted  Records"  shall mean any
          Records  that  are  subject  to  any  transfer  restriction.   If  any
          Restricted  Records may be  transferred to Gallo upon the payment of a
          fee or the satisfaction of another condition,  and Gallo pays such fee
          or satisfies such condition, such Records shall cease to be Restricted
          Records.

          5.6 No Liquidation,  Dissolution or Bankruptcy.  Chaco shall cause its
     articles of  incorporation  and by-laws to be amended to provide that Chaco
     shall not  liquidate,  dissolve or file, or permit to be filed,  bankruptcy
     for a period of three  years from the date of this  Agreement;  and further
     covenants that it shall not take any action to liquidate, dissolve or file,
     or permit to be filed, bankruptcy within this time period.

6. Conditions Precedent.

          6.1 Gallo's and PNRC's  Conditions.  The obligations of Gallo and PNRC
     to be performed at Closing are subject to the  fulfillment by Chaco, or the
     waiver by Gallo and PNRC,  before or at Closing,  of each of the  following
     conditions:

               6.1.1 the  representations  and  warranties of Chaco set forth in
          this Agreement  shall be true and correct in all material  respects on
          the date of this Agreement and as of the Closing Date;

               6.1.2 Chaco must have  performed  and  complied  in all  material
          respects with each of the covenants  and  conditions  required by this
          Agreement of which  performance  or compliance is required prior to or
          at the Closing;

               6.1.3 Gallo and PNRC receiving  approvals  from their  respective
          Boards of  Directors;

               6.1.4  completion of Gallo's and PNRC's due  diligence  review in
          accordance with Section 4 with results satisfactory to them;

               6.1.5  the  receipt  of all  necessary  Federal,  state and local
          governmental   and   regulatory   approvals   for   the   transactions
          contemplated  by this  Agreement;

               6.1.6 the receipt of any necessary  consents from third  parties;
          and

               6.1.7 the receipt of a legal  opinion  from  Worsham,  Forsythe &
          Wooldridge, L.L.P. confirming the matters in Section 3.1.1 above.

          6.2 Chaco's  Conditions.  The  obligations of Chaco to be performed at
     Closing are subject to each of the following  conditions,  unless waived by
     Chaco:

               6.2.1 the  representations  and  warranties of Gallo and PNRC set
          forth in this  Agreement  shall be true and  correct  in all  material
          respects as of the date of this Agreement and as of the Closing Date;

               6.2.2  Gallo and PNRC must have  performed  and  complied  in all
          material  respects with each of the covenants and conditions  required
          by this Agreement of which performance or compliance is required prior
          to or at the Closing;

               6.2.3 Chaco receiving approval from its Board of Directors;

               6.2.4  the  receipt  of all  necessary  Federal,  state and local
          governmental   and   regulatory   approvals   for   the   transactions
          contemplated by this Agreement;

               6.2.5 the receipt of any necessary  consents from third  parties;
          and

               6.2.6 the receipt of a legal opinion from the general  counsel of
          PNRC and Gallo confirming the matters in Section 3.2.1 above.

7. Closing.

          7.1 The  Closing.  The closing of the  transactions  described in this
     Agreement  shall be consummated  (the  "Closing") in Dallas,  Texas, at the
     offices of Worsham, Forsythe & Wooldridge,  L.L.P., 1601 Bryan Street, 30th
     Floor,  Dallas,  Texas 75201 before 2:00 p.m. on the 30th day of September,
     1998,  or as soon as  practicable  after receipt or waiver of all necessary
     consents and approvals and the  satisfaction or waiver of other  conditions
     precedent (the "Closing Date"); provided that, if Closing does not occur by
     December 15, 1998, this Agreement will terminate to the extent set forth in
     Section  10.2.  

          7.2 Documents to be Delivered at Closing. At the Closing,  Chaco shall
     deliver to Gallo:

               7.2.1 an Assignment,  Conveyance, Assumption, Consent and Release
          Agreement,  in the form attached as  Attachment I (the  "Assignment"),
          properly executed and acknowledged by Chaco;

               7.2.2 a  Notice  of  Assignment  of the  Assignment,  Conveyance,
          Assumption,  Consent and Release  Agreement  (the  "Notice")  properly
          executed and acknowledged by Chaco;

               7.2.3 a Special Warranty Deed, in the form attached as Attachment
          II (the "Deed"), properly executed and acknowledged by Chaco; and

               7.2.4 such forms of transfer documents (the "Transfer Documents")
          properly  executed  by Chaco  that  are  required  by the  appropriate
          federal or state authorities to transfer or assign, without warranties
          of any kind, the Other Interests.

          7.3 Execution of Assignment,  Notice, and Transfer  Documents.  At the
     Closing,  Gallo and PNRC shall cause the  Assignment,  the Notice,  and the
     Transfer  Documents to be properly  executed and  acknowledged on behalf of
     Gallo  and PNRC,  and shall  then  cause  the fully  executed  Notice to be
     properly  recorded  in the records of McKinley  County,  New Mexico.  Gallo
     shall also obtain the complete  execution of the Transfer  Documents by any
     required parties, and Gallo will properly file or record the fully executed
     Transfer Documents and the Deed.

          7.4 Payment of Net Payment.  At the  Closing,  Chaco shall pay to PNRC
     the Net Payment by wiretransfer  in immediately  available  funds.  Account
     Name: Peabody Natural Resources Company; Account Number:  323-037259;  Bank
     Name:  Chase Manhattan Bank; Bank Address:  New York, New York; ABA Number:
     21000021.

8. Assumptions by Gallo. As of the Closing, Gallo assumes: (a) all of the costs,
obligations and liabilities  that relate to the Assets and arise on or after the
Closing  Date,  other than  obligations  or  liabilities  incurred,  but not yet
required  to be  performed,  or  caused  by  Chaco  prior to the  Closing  Date,
including,  without limitation,  obligations and liabilities under the Lease and
the Contracts and obligations and  liabilities  relating to the Properties;  (b)
the  obligation  to comply with any  preferential  rights to purchase the Assets
that have not been complied with prior to Closing which preferential rights have
been fully  disclosed to Gallo by Chaco or appear of record and which arise only
under  Contracts  shown on  Exhibit  A; and (c) the  obligation  to  obtain  any
consents  (subject to the obligation of Chaco hereunder to reasonably  cooperate
with Gallo  without  compensation  in obtaining  any such consent) that have not
been  obtained  prior to  Closing.  Such  assumed  obligations  are  hereinafter
referred  to  as  the  "Gallo  Assumed  Obligations".  Included  in  the  costs,
obligations and liabilities assumed by Gallo as of the Closing, without limiting
such costs,  obligations  and  liabilities,  are all  liabilities,  obligations,
penalties,  fines, losses, costs or expenses, whether direct, indirect, pending,
threatened, contingent or otherwise (collectively, "Costs"), arising from, based
on, associated with, or related to the presence, handling, management,  storage,
transportation, processing, treatment, disposal, release, migration or escape of
Environmental  Contaminants  on or relating to the  Assets,  resulting  from any
action of Gallo on or after the Closing Date,  and whether based on  negligence,
strict liability or otherwise (collectively,  "Environmental  Liabilities").  As
used herein,  the term  "Environmental  Contaminants"  shall mean any pollutant,
waste, contaminant, or hazardous or toxic material, substance or waste.

9. Tax Prorations.  Real and personal property taxes for the Assets for calendar
year 1998 shall be prorated  between Gallo and Chaco, as appropriate,  as of the
Closing  Date.  Chaco shall pay Gallo such  amounts  within  thirty (30) days of
receipt of any invoicing by Gallo,  showing such amounts being  actually paid by
Gallo.  Any taxes in addition to the amounts prorated shall be the obligation of
Gallo.

10. Termination.

          10.1 Termination  Events.  Except as otherwise stated herein,  if: (i)
     any condition to Gallo's or PNRC's  obligations  hereunder is not satisfied
     and such  condition  is not waived by Gallo or PNRC (as the case may be) at
     or prior to the  Closing;  or (ii) any  condition  to  Chaco's  obligations
     hereunder is not satisfied and such  condition is not waived by Chaco at or
     prior to the Closing,  then the Party whose obligations are subject to such
     unwaived condition, may terminate this Agreement at its option, at or prior
     to the Closing Date, by written notice to the other Parties.  Closing shall
     be deemed  conclusive  waiver of any conditions  precedent(s) to Closing by
     the Parties.  

          This  Agreement is also subject to termination as provided in Sections
     4.2 and 7.1.

          10.2 Effect of  Termination.  In the event of the  termination of this
     Agreement  as provided or  referred to in this  Section 10, this  Agreement
     will  terminate and no Party will owe any further  obligations to any other
     Party,  except  that  the  terms  of  Sections  4 and 17 will  survive  the
     termination of this Agreement.

11. Survival, Indemnification and Liability.

          11.1  Survival.  The liability of Chaco,  Gallo and PNRC under each of
     their respective  representations,  warranties,  covenants,  agreements and
     indemnities shall survive Closing,  together with execution and delivery of
     the Deed, the Assignment, and the Transfer Documents.

          11.2 Gallo's and PNRC's  Indemnification.  To the extent  permitted by
     law, Gallo and PNRC,  from and after Closing,  shall defend,  indemnify and
     hold  Chaco  and TUC,  or  either of them,  and each of  Chaco's  and TUC's
     affiliates, together with each of their respective shareholders,  officers,
     directors,  employees and agents  (collectively  the "Chaco  Indemnitees"),
     harmless   from  and  against  any  and  all  claims,   demands,   actions,
     obligations,  and other liabilities  threatened  against or suffered by the
     Chaco  Indemnitees  as a  result  of  the  following  ("Claims"):  (i)  any
     Environmental  Liabilities  arising  from  the  actions  of  Gallo  or PNRC
     relating to the Assets on or after the Closing Date;  (ii) the ownership or
     operation  of  the  Assets  by  Gallo  or  PNRC  (excluding   Environmental
     Liabilities)  on  or  after  the  Closing  Date;  (iii)  any  liability  or
     obligation  expressly  assumed by Gallo or PNRC pursuant to this Agreement;
     or (iv) any fees or commissions  arising with respect to brokers or finders
     retained or engaged by Gallo or PNRC and resulting  from or relating to the
     transactions contemplated in this Agreement.

          11.3 Chaco's  Indemnification.  To the extent permitted by law, Chaco,
     from and after Closing, shall defend, indemnify and hold Gallo and PNRC, or
     either of them,  and each of Gallo's and PNRC's  affiliates,  together with
     each of their respective shareholders,  officers, directors,  employees and
     agents  (collectively the "Gallo  Indemnitees"),  harmless from and against
     any and all claims,  demands,  actions,  obligations and other  liabilities
     threatened  against or suffered by the Gallo Indemnitees as a result of the
     following:  (i) any Environmental  Liabilities  arising from the actions of
     Chaco relating to the Assets before the Closing Date; (ii) the ownership or
     operation  of the  Assets by Chaco  (excluding  Environmental  Liabilities)
     before the  Closing  Date,  (iii) any  liability  or  obligation  expressly
     assumed  by  Chaco  pursuant  to  this  Agreement;  or  (iv)  any  fees  or
     commissions  arising with respect to brokers or finders retained or engaged
     by Chaco and resulting from or relating to the transactions contemplated by
     this Agreement (collectively, the "Chaco Retained Obligations").

          11.4  Release  and  Covenant  Not to Sue by Gallo and  PNRC.  If Gallo
     acquires the Assets,  Gallo and PNRC hereby covenant and agree on behalf of
     themselves, together with their successor owners and assigns of the Assets,
     not to in any manner  whatsoever sue or bring any other action against,  or
     join any third party's action  against,  the Chaco  Indemnitees,  or any of
     them for or with  respect  to,  and as of the  Closing  Date  hereby  fully
     release the Chaco  Indemnitees from, any and all Claims that Gallo or PNRC,
     its successors and assigns,  may now have or in the future may have against
     the  Chaco  Indemnitees  that in any  way  arise  from  the  Gallo  Assumed
     Obligations;  provided,  that, with respect to Chaco's  obligations to PNRC
     under the Lease,  this  release  and  covenant  not to sue shall  extend to
     Claims arising under the Lease before,  on, or after the Closing Date.

          11.5 Release and Covenant Not to Sue by Chaco.  If Gallo  acquires the
     Assets,  Chaco hereby covenants and agrees not to in any manner  whatsoever
     sue or bring any other action  against,  or join any third  party's  action
     against, the Gallo Indemnitees,  or any of them for or with respect to, and
     as of the Closing Date hereby fully release the Gallo Indemnitees from, any
     and all Claims that Chaco,  its successors and assigns,  may now have or in
     the future may have  against  the Gallo  Indemnitees  that in any way arise
     from the  Lease or the  Chaco  Retained  Obligations.

          11.6  Limitation  of Liability.  Chaco,  Gallo and PNRC each waive any
     right to recover special,  exemplary or consequential damages in any action
     or proceeding relating to this Agreement.

12. Further Assurances.  After the Closing,  each of Chaco, Gallo and PNRC shall
execute,  acknowledge  and deliver,  or cause to be executed,  acknowledged  and
delivered,  such  instruments,  and take such other action, as reasonably may be
necessary to carry out their obligations  under this Agreement,  or any exhibit,
document,  certificate or other instrument delivered pursuant hereto. 

13. Access to Records by Chaco. After the Closing Date, Chaco and its authorized
representatives  shall have reasonable access (including  copying  privileges at
Chaco's sole cost and expense)  during Gallo's and PNRC's normal  business hours
to the books and records of Gallo and PNRC  pertaining to the Assets for periods
prior to the Closing Date.

14. Notices. Any notice,  communication,  request, instruction or other document
required  or  permitted  hereunder  shall be given in writing and  delivered  in
person or sent by U.S. Mail, postage prepaid,  return receipt  requested,  or by
telex,  facsimile or telecopy,  to the addresses of the Parties set forth below.
Any such notice shall be effective upon receipt.

         Chaco:                     Chaco Energy Company
                                    1601 Bryan Street, 42nd Floor
                                    Dallas, Texas 75201
                                    Attention: Peter B. Tinkham

         Gallo:                     Gallo Finance Company
                                    701 Market Street
                                    Suite 713
                                    St. Louis, MO 63101
                                    Attention: President

         PNRC:                      Peabody Natural Resources Company
                                    701 Market Street
                                    Suite 718
                                    St. Louis, MO 63101
                                    Attention: General Partners

Any Party may,  by written  notice so  delivered,  change its address for notice
purposes hereunder.

15. Assignment.  None of Chaco, Gallo and PNRC may assign its respective rights,
or delegate its respective duties or obligations,  arising under this Agreement,
without the prior written consent of the other Parties.

16. Governing Law. This Agreement shall be governed and construed in accordance
with the laws of the State of New Mexico,  without the effect of any  principles
of conflicts of laws.

17. Expenses and Fees.  Whether or not the  transactions  contemplated  by this
Agreement are consummated, each of the Parties will pay the fees and expenses of
their respective counsel, accountants,  engineers and other consultants retained
by them incident to the transactions contemplated by this Agreement.  Gallo will
pay all fees for the recording of transfer  documents,  together with any sales,
transfer,  stamp or other excise taxes resulting from the transfer of the Assets
to Gallo. All other costs shall be borne by the Party incurring them.

18. Integration. This Agreement, together with the Exhibits hereto and the other
agreements  to be entered into by the Parties  pursuant  hereto,  sets forth the
entire agreement and understanding of the Parties in respect to the transactions
referenced  herein,  and  supersedes  all  other  agreements,  arrangements  and
understandings relating to the subject matter hereof, except with respect to the
Confidentiality  Agreement  described in Section 4, which  remains in full force
and effect.

19.  Modification.  This  Agreement  may be  amended,  modified,  superseded  or
canceled,  and  any of the  terms,  covenants,  representations,  warranties  or
conditions hereof may be waived,  only by a written instrument  executed by duly
authorized  officers  of Chaco,  Gallo and PNRC,  or, in the case of a waiver or
consent,  by or on behalf of the Party or Parties  waiving  compliance or giving
such consent.

20. Independent Investigation. Gallo and PNRC acknowledge that, in entering into
this Agreement, and consummating the transactions contemplated hereby, Gallo and
PNRC  have  relied  on the  basis  of  their  own  independent  inspections  and
investigations of the Assets,  together with the express written representations
of Chaco set forth in this Agreement, the Assignment,  the Deed and the Transfer
Documents.  Except as expressly set forth in this Agreement, the Assignment, the
Deed and the Transfer  Documents  CHACO MAKES NO  REPRESENTATIONS  OR WARRANTIES
WITH RESPECT TO THE ASSETS.  IN ADDITION,  GALLO AND PNRC ACKNOWLEDGE THAT CHACO
HAS NOT MADE, AND HEREBY  EXPRESSLY  DISCLAIMS AND NEGATES,  EXCEPT AS EXPRESSLY
PROVIDED  FOR IN THIS  AGREEMENT,  THE DEED,  THE  ASSIGNMENT  AND THE  TRANSFER
DOCUMENTS, ANY AND ALL WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, AT COMMON LAW
OR STATUTORY,  INCLUDING,  WITHOUT LIMITATION, ANY REPRESENTATIONS OR WARRANTIES
RELATING  TO TITLE,  HABITABILITY,  MERCHANTABILITY,  FITNESS  FOR A  PARTICULAR
PURPOSE, OR CONFORMITY TO MODELS, SAMPLES OR MATERIALS,  TOGETHER WITH ANY OTHER
REPRESENTATIONS  OR WARRANTIES  WITH RESPECT TO THE ASSETS,  OR ANY AGREEMENT OR
INSTRUMENT RELATED THERETO.

21.  Multiple  Originals.  This  Agreement  may be  executed  in any  number  of
identical originals.  In making proof of this Agreement,  it is not necessary to
produce or account for more than one original.

22.  Announcements.  Prior and  subsequent to the Closing  Date,  none of Chaco,
Gallo  and  PNRC  shall  make  written  announcements  or other  written  public
disclosures or issue press releases relating to the content of this Agreement or
the transactions  contemplated  hereby without the prior written approval of the
other  Parties  to this  Agreement  to the form and  content  of the  release or
disclosure.  Notwithstanding  the  foregoing,  each Party  shall be  entitled to
disclose such information  without limitation (i) to its affiliates,  attorneys,
financial or lending institutions, outside auditors and insurers, (ii) as may be
required  by law  or by  regulation  or  order  of  Governmental  Authority,  or
contract,  or by the rules of any stock exchange applicable to such Party or its
affiliates,  or as part of such  Party's  good  faith  attempt  to  comply  with
disclosure  obligations under any of the same, (iii) to the extent necessary for
such Party to obtain  third  party  consents;  and (iv) as may be  necessary  or
desirable to enforce such Party's rights hereunder.

23. Negotiation of Agreement.  This Agreement was negotiated by all Parties, and
not by any Party to the exclusion of the other  Parties.  The Parties agree that
this Agreement shall not be construed against or interpreted to the disadvantage
of any Party by any court, or other governmental or judicial authority,  because
of any Party having, or being deemed to have,  prepared,  structured or dictated
this Agreement, or any provision herein.

         EXECUTED AND EFFECTIVE as of the date first set forth above.

CHACO:                                      GALLO:

CHACO ENERGY COMPANY                GALLO FINANCE COMPANY



By:/s/ Peter B. Tinkham             By:/s/ W. Howard Carson
- -------------------------------     -----------------------
Name: Peter B. Tinkham              Name:  W. Howard Carson
Its:  Executive Vice President      Its:   Vice President

                                    PNRC:
                                    PEABODY NATURAL RESOURCES
                                    COMPANY, by its General Partners

                                    Gold Fields Mining Corporation,
                                    General Partner


                                    By:/s/ W. Howard Carson
                                    -----------------------
                                    Name:  W. Howard Carson
                                    Its:   Vice President

                                    Peabody America, Inc.,
                                    General Partner


                                    By:/s/ W. Howard Carson
                                    -----------------------
                                    Name:  W. Howard Carson
                                    Its:   Vice President














A-2

                                    EXHIBIT A

          Attached to and made a part of that certain Agreement between
                 Chaco Energy Company, Peabody Natural Resources
                        Company and Gallo Finance Company

                              Schedule of Contracts

1.       Exchange  Closing  Agreement  dated June 25, 1993  between  Hospah Coal
         Company,  The  Atchison,  Topeka and Santa Fe Railroad  Company,  Chaco
         Energy Company, Hanson Natural Resources Company and others.

2.       Option to Acquire Interest in Fee and Private Easement Right-Of-Way for
         the Baca Coal Spur dated June 25, 1993 between Chaco Energy Company and
         Santa Fe Pacific Minerals Corporation.

3.       Option to Acquire Interest in State Right-Of-Way for the Baca Coal Spur
         dated June 25, 1993 between  Chaco Energy  Company and Santa Fe Pacific
         Minerals Corporation.

4.       Agreement to Provide  Advance  Notice to Chaco of Termination of Ground
         Lease for the Baca Coal Spur dated June 25, 1993  between  Chaco Energy
         Company,  Santa  Fe  Pacific  Minerals  Corporation  and  LRCS  Limited
         Partnership.

5.       Amended and Restated  Rail  Facilities  Agreement  dated June 25, 1993,
         between Chaco Energy Company, The Atchison, Topeka and Santa Fe Railway
         Company,  Star Lake  Railroad  Company  and  Hanson  Natural  Resources
         Company and others.

6.       Rail  Transportation  Agreement  dated  February  28, 1990  between The
         Atchison  Topeka and Santa Fe Railway Company and Chaco Energy Company,
         as amended by First  Amendment to Rail  Transportation  Agreement dated
         June 25, 1993.

7.       Amended  and  Restated  San Juan Basin  Agreement  dated June 25,  1993
         between Hospah Coal Company, Hanson Natural Resources Company and Chaco
         Energy  Company;  a Notice and  Memorandum  of Amended and Restated San
         Juan Basin Agreement being recorded with the Clerk of McKinley  County,
         New Mexico in Book 6 of COMP, pp.9193-9208.

8.       Agreement  entered  into on July 22, 1981  between the Navajo  Nation,
         also known as the Navajo Tribe, and Chaco Energy Company.

9.       Agreement dated October 24, 1980 between Jerry Elkins and Luann Elkins,
         husband and wife (as  successors  to Rollin M. Albers and wife,  Imogen
         Albers and Betty  Albers,  individually  and as Trustee under the Trust
         established  under  the  last  Will  and  Testament  of W.  B.  Albers,
         Deceased,  collectively  doing  business as Albers  Brothers) and Chaco
         Energy Company.

10.      Agreement  dated April 7, 1978 between  Claude  Fondaw and wife,  Anna
         Pauline Fondaw and Chaco Energy Company.

11.      Grazing Permit between Tanner, Inc. and Chaco Energy Company dated July
         1, 1983, as amended on October 18, 1988 and December 8, 1997.

12.      Agreement, dated September 10, 1980, by and between the Pueblo Pintado,
         the Whitehorse Lake Chapters, and Chaco Energy Company.




B-2

                                    EXHIBIT B

          Attached to and made a part of that certain Agreement between
                 Chaco Energy Company, Peabody Natural Resources
                        Company and Gallo Finance Company

                            Description of Properties


1.       All of  Chaco's  right,  title and  interest  in the  Sections 1 and 3,
         Township 16 North,  Range 10 West, NMPM,  McKinley County,  New Mexico,
         subject,  however,  to that certain  Agreement  dated  October 24, 1980
         between Jerry Elkins and Luann Elkins,  husband and wife (as successors
         to  Rollin  M.  Albers  and  wife,  Imogen  Albers  and  Betty  Albers,
         individually and as Trustee under the Trust  established under the last
         Will  and  Testament  of W. B.  Albers,  Deceased,  collectively  doing
         business as Albers Brothers) and Chaco Energy Company.

2.       All of Chaco's  right,  title and interest in that tract of land out of
         the NW/4 NE/4 of Section  10,  Township 19 North,  Range 6 West,  NMPM,
         McKinley  County,  New  Mexico,  more  particularly  described  in that
         Warranty  Deed dated  April 7, 1978 from Claude  Fondaw and wife,  Anna
         Pauline Fondaw, which Deed is recorded at Book 31, Page 911 of the Deed
         Records of McKinley  County,  New  Mexico,  subject,  however,  to that
         certain  Agreement  dated April 7, 1978 between Claude Fondaw and wife,
         Anna Pauline Fondaw and Chaco Energy Company.

3.       All of Chaco's  right,  title and  interest  in the  following  lands:
         Township 19 North, Range 6 West, NMPM, McKinley County, New Mexico N/2
         Section 9; and  Sections 1, 3, 11 and 12;  Township 20 North,  Range 7
         West, NMPM,  McKinley  County,  New Mexico Sections 13, 14, 23, 24 and
         25; Township 20 North, Range 6 West, NMPM, McKinley County, New Mexico
         SW/4 Section 34 and Sections 29, 31, and 33; subject, however, to that
         Agreement  entered  into on July 22, 1981  between the Navajo  Nation,
         also  known as the  Navajo  Tribe,  and Chaco  Energy  Company  and to
         certain  option rights  described in that Special  Warranty Deed dated
         July 22, 1981 from the Navajo Tribe to Chaco Energy Company,  which is
         recorded  at Book 32,  pp.  339-340 of the Deed  Records  of  McKinley
         County, New Mexico.

4.       All of Chaco's  right,  title and  interest  in the NE/4 of Section 8,
         Township 19 North, Range 6 West, NMPM, McKinley County, New Mexico.

5.       All of Chaco's right,  title and interest in the Section 32,  Township
         20 North, Range 6 West, NMPM, McKinley County, New Mexico.





C-1

                                    EXHIBIT C

          Attached to and made a part of that certain Agreement between
                 Chaco Energy Company, Peabody Natural Resources
                        Company and Gallo Finance Company


                         Description of Other Interests


1.       Right of Way granted by the United  States  Department of the Interior,
         Bureau of Land  Management to Chaco Energy  Company on October 10, 1980
         (BLM ROW NM-041566).

2.       Coal  Mining  Lease  between  the State of New Mexico and Chaco  Energy
         Company  dated  September  15,  1986,  covering  the S/2 of  Section 2,
         T19N-R6W, NMPM (Lease No. M-15596-4 (Renewal)).

3.       Coal  Mining  Lease  between  the State of New Mexico and Chaco  Energy
         Company dated September 15, 1986,  covering Lots 1, 2, 3, 4 and the S/2
         N/2 of Section 2, T19N-R6W, NMPM (Lease No. M-15597-4 (Renewal)).

4.       State of New Mexico Business Lease covering Section 2, T16N-R10W, NMPM
         (BL-1021).

5.       New Mexico State Engineer  Office,  Monitor Well Permit  numbers:
         SJ-989-1 through SJ989-6.





I-7

                                  ATTACHMENT I


                   Attached to and made a part of that certain
                     Agreement between Chaco Energy Company,
                      Peabody Natural Resources Company and
                             Gallo Finance Company.

                       ASSIGNMENT, CONVEYANCE, ASSUMPTION,
                          CONSENT AND RELEASE AGREEMENT

         THIS ASSIGNMENT,  CONVEYANCE, ASSUMPTION, CONSENT AND RELEASE AGREEMENT
("Assignment")  is dated this 30th day of September,  1998, by and between Chaco
Energy Company, a New Mexico corporation ("Chaco" or "Assignor"),  whose address
is 1601 Bryan Street,  Dallas,  Texas 75201,  Gallo Finance Company,  a Delaware
corporation  ("Assignee"),  whose address is 701 Market  Street,  Suite 713, St.
Louis, Missouri 63101, and Peabody Natural Resources Company, a Delaware general
partnership ("Lessor" or "PNRC").  Chaco, Assignee and Lessor may be referred to
in this Assignment individually as a "Party" and collectively as the "Parties."

         WHEREAS,  Chaco is the lessee  under that  certain Coal Lease dated and
effective as of April 15, 1977 from Hospah Coal Company, as lessor, to Chaco, as
amended by  Modification  No. 1 dated February 12, 1981, as amended and restated
by Modification  No. 2 effective as of February 28, 1990, and as further amended
by Amendment  To Coal Lease dated June 25, 1993 (the Coal Lease,  as so amended,
being  referred to in this  Assignment as the  "Lease");  Memoranda of the Lease
being  recorded  with the Clerk of  McKinley  County,  New  Mexico in Book 47 of
Leases,  Pages 338 through 342; in Book 52 of Leases, Pages 302 through 305; and
in Book 1 COMP, Pages 6051 through 6054; and

          WHEREAS,  Lessor has succeeded to the rights of Hospah Coal Company as
lessor under the Lease; and

         WHEREAS,  Assignee wishes to acquire from Chaco all of Chaco's interest
in the Lease and  certain  related  contracts  (as more  particularly  described
below,  the  "Contracts"),  and Chaco  wishes to assign and convey to  Assignee,
without  warranties of any kind except as specified in this  Assignment,  all of
Chaco's rights in the Lease and the Contracts; and

         WHEREAS,  Section 21(B) of the Lease provides  that,  without the prior
written approval of Lessor,  Chaco will not assign, in whole or part, its rights
and obligations under the Lease; and

         WHEREAS,  Texas  Utilities  Company  ("TUC") assured the performance of
certain of Chaco's obligations under the Lease pursuant to that surety agreement
dated April 15, 1977,  as amended and  restated by Amended and  Restated  Surety
Agreement  effective  February 28, 1990 between TUC and Hospah Coal Company (the
original  surety  agreement,  as amended  and  restated,  is referred to in this
Assignment as the "Surety Agreement"); and

         WHEREAS,  Chaco  wishes to assign and convey all of its interest in the
Lease and the Contracts to Assignee,  Assignee  wishes to assume all obligations
under the Lease and the Contracts, and Lessor and Assignee wish to release Chaco
and TUC from: (a) certain  obligations and  liabilities  under or related to the
Lease and the Contracts; and (b) the Surety Agreement.

         NOW  THEREFORE,  in  consideration  of ten dollars  and other  valuable
consideration,  the receipt and  sufficiency  of which is  acknowledged  by each
Party, Chaco, Assignee and Lessor agree as follows:

     1. Subject to all of the other terms of this Assignment, Chaco hereby:

          (a)  with limited special  warranty of title,  only assigns,  conveys,
               transfers and sets over to the Assignee all of Assignor's  right,
               title and interest in and to the Lease; and

          (b)  assigns to Assignee,  with no warranties of any kind,  all of its
               right,  title and interest in and to the  contracts  described in
               Exhibit A  attached  to and made a part of this  Assignment  (the
               "Contracts").

     2. The Lease and the  Contracts  (collectively,  the "Assets") are assigned
and conveyed, and the limited special warranties of title made in Section 1, are
subject to the following terms, conditions, reservations and exceptions:

          (a)  all   exceptions,   conveyances,   reservations,   easements  and
               encumbrances  that appear in the records of McKinley County,  New
               Mexico;

          (b)  all exceptions, limitations,  restrictions and matters referenced
               in any exhibit attached to this Assignment;

          (c)  easements,  or  claims  of  easements,  on or  across  the  Lease
               (whether  visible or not),  which are not  recorded in the public
               records;

          (d)  general  real estate taxes and special  assessments  for 1998 and
               subsequent years not yet due and payable,  and any subsequent tax
               assessment, the payment of all of which Assignee assumes; and

          (e)  EXCEPT TO THE EXTENT SET FORTH IN THIS ASSIGNMENT TO THE CONTRARY
               AND AS OTHERWISE  PROVIDED FOR IN THE AGREEMENT  (DEFINED BELOW),
               CHACO  EXPRESSLY  DISCLAIMS ALL  WARRANTIES  OF ANY KIND,  EITHER
               STATUTORY,  EXPRESS OR IMPLIED, WITH RESPECT TO THE LEASE AND THE
               CONTRACTS,  INCLUDING,  WITHOUT LIMITATION, THE DISCLAIMER OF ANY
               WARRANTIES AS TO TITLE,  HABITABILITY,  MERCHANTABILITY,  FITNESS
               FOR A PARTICULAR  PURPOSE,  OR THE PRESENCE OF COAL ON THE LEASED
               PREMISES,  AND ASSIGNEE ACCEPTS THE LEASE AND THE CONTRACTS "WITH
               ALL  FAULTS,"  "AS-IS,"  WITHOUT ANY  WARRANTIES  OF ANY KIND AND
               WITHOUT  REPRESENTATION  OR  WARRANTY  BY CHACO  WITH  REGARD  TO
               PHYSICAL DEFECTS (WHETHER LATENT OR PATENT).

     3. The Assignee  hereby  assumes,  agrees to be bound by, and undertakes to
perform or to have  performed  each and every one of the terms,  covenants,  and
conditions contained in the Lease on and after the date of this Assignment.

     4. PNRC hereby  consents to and  recognizes  the Assignee as the Assignor's
successor in interest in and to the Lease.  The Assignee hereby becomes entitled
to all right,  title,  and  interest of the  Assignor in and to the Lease in all
respects  as if the  Assignee  were the  original  party to the Lease.  The term
"Lessee" as used in the Lease shall be hereafter deemed to refer to the Assignee
rather than to the Assignor.

     5. PNRC hereby fully releases  Assignor,  as the original Lessee,  from any
and all  liability of any kind relating to the Lease,  including  payment of all
advance royalties due and payable under the Lease.

     6. PNRC hereby  fully  releases  Texas  Utilities  Company  from the Surety
Agreement, and the Surety Agreement is hereby deemed terminated.

     7.  PNRC  hereby  further  releases  Assignor  from  any and all  liability
relating  to the Lease for any  events,  actions or  inactions  of the  Assignee
occurring under the Lease on or subsequent to the date of this Assignment.

     8. The Assignor hereby releases PNRC from any and all liability relating to
the Lease for any events,  actions or  inactions of PNRC,  as Lessor,  under the
Lease occurring prior to, on or subsequent to the date of this Assignment.

     9. All notices provided for under the Lease which had previously been given
to Assignor shall be given to Assignee at the following address,  unless PNRC is
otherwise notified by Assignee:

         Gallo Finance Company
         701 Market Street, Ste. 713
         St. Louis, Missouri  63101
         Attention:  President

     10. Except as herein  modified,  the Lease shall  otherwise  remain in full
force and effect.

     11.  Assignee hereby accepts and assumes all obligations of Chaco under the
Lease, the Contracts and all instruments affecting the Assets and agrees that is
bound by the  terms and  conditions  of the  Lease  and the  Contracts  and each
instrument  affecting the Assets as if Assignee were an original signatory party
thereto.

     12. Lessor hereby  consents to the  assignment of the Lease as set forth in
this Assignment.

     13. This  Assignment is further subject to the terms and conditions of that
Agreement dated  September 30, 1998  ("Agreement")  between Chaco,  Assignee and
Lessor, including without limitation,  terms and conditions relating to releases
and indemnifications by the Parties.

     IN WITNESS  WHEREOF,  this Agreement is executed  effective as of this 30th
day of September, 1998.

                        CHACO:
                        CHACO ENERGY COMPANY


                        By:____________________________
                        Name:__________________________
                        Title:___________________________

                        ASSIGNEE:
                        GALLO FINANCE COMPANY


                        By:_____________________________
                        Name:__________________________
                        Title:___________________________

                        LESSOR:
                        PEABODY NATURAL RESOURCES COMPANY,
                        by its General Partners
                        Gold Fields Mining Corporation,
                        General Partner


                        By:____________________________
                        Name:__________________________
                        Title:___________________________

                        Peabody America, Inc.,
                        General Partner


                        By:____________________________
                        Name:__________________________
                        Title:___________________________









State of Texas    ss.
                  ss.
County of Dallas  ss.

         This  instrument was  acknowledged  before me on September ___, 1998 by
_____________________________,  _______  President  of Chaco Energy  Company,  a
Texas corporation, on behalf of said corporation.


                       ------------------------------
                       Notary Public, State of Texas
                       Printed Name:___________________
                       My Commission expires:__________



State of ________ ss.
                  ss.
County of ______  ss.

         This  instrument was  acknowledged  before me on September ___, 1998 by
_____________________________,  _______  President of Gallo Finance  Company,  a
Delaware corporation, on behalf of said corporation.


                       ------------------------------
                       Notary Public, State of ___________
                       Printed Name:___________________
                       My Commission expires:__________







State of ________ ss.
                  ss.
County of ______  ss.

         This  instrument was  acknowledged  before me on September ___, 1998 by
_____________________________,   _______   President   of  Gold  Fields   Mining
Corporation,  a general partner of Peabody Natural Resources Company,  on behalf
of Peabody Natural Resources Company, a Delaware general partnership.


                       ------------------------------
                       Notary Public, State of ___________
                       Printed Name:___________________
                       My Commission expires:__________





State of ________ ss.
                  ss.
County of ______  ss.

         This  instrument was  acknowledged  before me on September ___, 1998 by
_____________________________,  _______  President of Peabody  America,  Inc., a
general  partner  of Peabody  Natural  Resources  Company,  on behalf of Peabody
Natural Resources Company, a Delaware general partnership.


                       -----------------------------
                       Notary Public, State of ___________
                       Printed Name:___________________
                       My Commission expires:__________

















A-2

                                    EXHIBIT A

             Attached to and made a part of that certain Assignment,
              Conveyance, Assumption, Consent and Release Agreement
                          between Chaco Energy Company,
           Peabody Natural Resources Company and Gallo Finance Company


                              Schedule of Contracts

1.   Exchange Closing Agreement dated June 25, 1993 between Hospah Coal Company,
     The Atchison,  Topeka and Santa Fe Railroad Company,  Chaco Energy Company,
     Hanson Natural Resources Company and others.

2.   Option to Acquire Interest in Fee and Private Easement Right-Of-Way for the
     Baca Coal Spur dated June 25, 1993 between  Chaco Energy  Company and Santa
     Fe Pacific Minerals Corporation.

3.   Option to Acquire  Interest  in State  Right-Of-Way  for the Baca Coal Spur
     dated June 25,  1993  between  Chaco  Energy  Company  and Santa Fe Pacific
     Minerals Corporation.

4.   Agreement to Provide Advance Notice to Chaco of Termination of Ground Lease
     for the Baca Coal Spur dated June 25, 1993 between  Chaco  Energy  Company,
     Santa Fe Pacific Minerals Corporation and LRCS Limited Partnership.

5.   Amended and Restated Rail Facilities Agreement dated June 25, 1993, between
     Chaco Energy Company,  The Atchison,  Topeka and Santa Fe Railway  Company,
     Star Lake Railroad Company and Hanson Natural Resources Company and others.

6.   Rail Transportation  Agreement dated February 28, 1990 between The Atchison
     Topeka and Santa Fe Railway Company and Chaco Energy Company, as amended by
     First Amendment to Rail Transportation Agreement dated June 25, 1993.

7.   Amended and Restated San Juan Basin  Agreement  dated June 25, 1993 between
     Hospah Coal  Company,  Hanson  Natural  Resources  Company and Chaco Energy
     Company;  a Notice and  Memorandum  of Amended and  Restated San Juan Basin
     Agreement being recorded with the Clerk of McKinley  County,  New Mexico in
     Book 6 of COMP, pp.9193-9208.

8.   Agreement  entered  into on July 22, 1981 between the Navajo  Nation,  also
     known as the Navajo Tribe, and Chaco Energy Company.

9.   Agreement  dated  October 24, 1980 between  Jerry Elkins and Luann  Elkins,
     husband and wife (as successors to Rollin M. Albers and wife, Imogen Albers
     and Betty Albers,  individually and as Trustee under the Trust  established
     under the last Will and Testament of W. B. Albers,  Deceased,  collectively
     doing business as Albers Brothers) and Chaco Energy Company.

10.  Agreement  dated April 7, 1978 between Claude Fondaw and wife, Anna Pauline
     Fondaw and Chaco Energy Company.

11.  Grazing Permit between Tanner,  Inc. and Chaco Energy Company dated July 1,
     1983, as amended on October 18, 1988 and December 8, 1997.






B-2







II-2


                                  ATTACHMENT II


                   Attached to and made a part of that certain
                     Agreement between Chaco Energy Company,
                      Peabody Natural Resources Company and
                             Gallo Finance Company.


RECORDING REQUESTED BY
AND WHEN RECORDED, MAIL
TO SUSAN MCCORMACK, ESQ.
KELEHER & MCLEOD, P.A.
P.O. DRAWER AA, ALBUQUERQUE, NM 87103

                              SPECIAL WARRANTY DEED

     Chaco  Energy   Company,   a  New  Mexico   corporation,   ("Grantor")  for
consideration paid, grants, gives, bargains, sells, and conveys to Gallo Finance
Company, a Delaware corporation ("Grantee"), whose address is 701 Market Street,
Ste.  713,  St.  Louis,  Missouri  63101 all of that real  property  situated in
McKinley County,  New Mexico,  which property is more particularly  described in
Exhibit A attached  hereto (the  "Granted  Premises"),  subject to those matters
expressly set forth in the description thereof (the "Exceptions").

     Grantor,  for  itself  and its  successors,  covenants  with  Grantee,  its
successors and assigns, that the Granted Premises are free from all encumbrances
made by Grantor,  and that Grantor will, and its successors  shall,  warrant and
defend the same to Grantee,  its  successors  and assigns,  forever  against the
lawful claims and demands of all persons  claiming by, through or under Grantor,
but  against  none other,  provided  that any and all  exceptions,  conveyances,
reservations,  easements and encumbrances that appear in the records of McKinley
County, New Mexico are excluded from this warranty.

     IN WITNESS  WHEREOF,  Grantor has executed this SPECIAL WARRANTY DEED as of
the _____ day of September, 1998.


                         CHACO ENERGY COMPANY


                         By:____________________________
                         Name:__________________________
                         Title:___________________________


                         ACKNOWLEDGMENT FOR CORPORATION

State of Texas    ss.
                  ss.
County of Dallas  ss.

         The foregoing  instrument was acknowledged  before me this _____ day of
September, 1998, by  ______________________________________,  ________ President
of  Chaco  Energy  Company,  a  New  Mexico  corporation,   on  behalf  of  said
corporation.


                         ------------------------------
                         Notary Public, State of ___________
                         Printed Name:___________________
                         My Commission expires:__________






A-2

                                   EXHIBIT "A"
                                       TO
                              SPECIAL WARRANTY DEED
                                 BY AND BETWEEN
                      CHACO ENERGY COMPANY ("GRANTOR") AND
                        GALLO FINANCE COMPANY ("GRANTEE")

         Any and all  right,  title and  interest  of Grantor in and to the real
property  described  below  (the "Real  Property")  and all  rights,  interests,
privileges, hereditaments and appurtenances incident thereto, including, but not
limited to:

     a)   any and all right, title and interest in minerals,  including, without
          limitation,  gold, coal, silver, precious metals, base metals, oil and
          gas, and, to the extent  considered  minerals  under  applicable  law,
          sand,  gravel,  stone and  geothermal  steam,  and rights  appurtenant
          thereto;

     b)   any and all  right,  title and  interest  in and to (and all rights to
          use) the surface estate;

     c)   any and all easements, licenses, privileges, uses and rights-of-way;

     d)   any  and  all  buildings,   improvements,   structures,  fixtures  and
          facilities located in, on or under,  affixed to or erected upon any of
          the Real Property;

     e)   any and all water, water rights, and applications for water rights, in
          and to the following Real Property:

1.       Sections 1 and 3,  Township  16 North,  Range 10 West,  NMPM,  McKinley
         County, New Mexico,  subject,  however, to that certain Agreement dated
         October 24, 1980  between  Jerry Elkins and Luann  Elkins,  husband and
         wife (as  successors  to Rollin M. Albers and wife,  Imogen  Albers and
         Betty Albers,  individually and as Trustee under the Trust  established
         under  the  last  Will  and  Testament  of  W.  B.  Albers,   Deceased,
         collectively  doing  business  as Albers  Brothers)  and  Chaco  Energy
         Company.

2.       A tract of land out of the NW/4 NE/4 of Section 10,  Township 19 North,
         Range 6 West, NMPM,  McKinley  County,  New Mexico,  more  particularly
         described in that  Warranty Deed dated April 7, 1978 from Claude Fondaw
         and wife, Anna Pauline Fondaw,  which Deed is recorded at Book 31, Page
         911 of the Deed  Records  of  McKinley  County,  New  Mexico,  subject,
         however,  to that certain  Agreement dated April 7, 1978 between Claude
         Fondaw and wife, Anna Pauline Fondaw and Chaco Energy Company.

3. The following lands:

         Township 19 North, Range 6 West, NMPM,  McKinley County, New Mexico N/2
         Section 9; and  Sections 1, 3, 11 and 12;  Township  20 North,  Range 7
         West, NMPM, McKinley County, New Mexico
         Sections 13, 14, 23, 24 and 25;
         Township 20 North, Range 6 West, NMPM, McKinley County, New Mexico SW/4
         Section 34 and Sections 29, 31, and 33;
         subject,  however,  to that  Agreement  entered  into on July 22,  1981
         between the Navajo  Nation,  also known as the Navajo Tribe,  and Chaco
         Energy Company and to certain  option rights  described in that Special
         Warranty Deed dated July 22, 1981 from the Navajo Tribe to Chaco Energy
         Company,  which is recorded at Book 32, pp. 339-340 of the Deed Records
         of McKinley County, New Mexico.

4.       The NE/4 of Section 8, Township 19 North, Range 6 West, NMPM, McKinley
         County,  New Mexico.  5. Section 32, Township 20 North,  Range 6 West,
         NMPM, McKinley County, New Mexico.





III-1