Document:

TRINITY ENERGY RESOURCES, INC.

T. C. O'DELL, CHAIRMAN,
PRESIDENT  &  CEO

                                November 29, 1999

Cliveden  Petroleum Co. Ltd.
17  XXXI  Decembre
Geneva 1207 Switzerland
c/o:  J. Rolfe Johnson          FAX  NO.  713-621-2772

Dear  Mr.  Johnson:

     This  letter  hereby  acknowledges  the  agreement  between  Trinity Energy
Resources,  Inc.  ("Trinity")  and  Cliveden  Petroleum Co. Ltd. ("Cliveden") to
extend  until December 31, 1999 the time that Cliveden must notify Trinity as to
whether  it  has  elected to exercise its rights under the Farmout provisions of
that  certain  agreement  between  Trinity  and  Cliveden  dated  May  5,  1999.

     The  parties further agree that neither Cliveden nor any of its principals,
employees,  agents or representatives, will, for a period of two years from this
date,  directly or indirectly, take any action, alone or in concert with others,
that  would  bypass  or  circumvent Trinity regarding the acreage held under its
Convention  Agreement  with  the Republic of Chad and the associated Exploration
Permit  H.

     If this agreement meets with your approval, please sign below and return at
your  earliest  convenience  to  me.

Sincerely,                              AGREED  &  ACCEPTED  this  29th  day  of
                                                                   ----
                                        Nov.___________________.  1999

TRINITY ENERGY RESOURCES, INC.
                                        CLIVEDEN  PETROLEUM  CO.  LTD.
T. C. O'DELL (SIGNATURE)

T. C. O'Dell                            Friedhelm  Eronat
Chairman & Chief Executive Officer      ----------------------------------------
                                        by

                                        President
                                        ----------------------------------------
                                        Title

--------------------------------------------------------------------------------
         11757 Katy Freeway - Suite 1430 - Houston, Texas 77079-1726
                   Tel: 281-589-7675  Fax: 281-589-7712

<PAGE>PURCHASE AND SALE AGREEMENT

For  good  and  valuable  consideration,  the  sufficiency  of which is herewith
acknowledged,  this  Purchase  and  Sale  Agreement  (hereinafter referred to as
"Agreement") is made and entered into effective 1 January,  1999, by and between
the  following:

1)   CARLTON ENERGY GROUP,  LLC., a Texas Limited  Liability  Company,  with its
     principal  place of business at 952 Echo Lane,  Suite 210,  Houston,  Texas
     77024 (hereinafter referred to as "CEG"); and

2)   TRINITY GAS CORPORATION, a Nevada Corporation,  with its principal place of
     business at 952 Echo Lane, Suite #210,  Houston,  Texas 77024  (hereinafter
     referred to as "TGC"); and

3)   IAN TORSTEN NORDSTROM,  an individual residing in Palma Majorca, Spain with
     Swedish Passport No. 54011098 (hereinafter referred to as "ITN"); and

4)   RUDOLF W.  OLSCHEWSKI,  an  individual  residing in Hamburg,  Germany  with
     German Passport No. 1716031632 (hereinafter referred to as "RWO").

CEG,  TGC,  ITN  and RWO and are also herein referred to individually as "Party"
and  collectively as "Parties".

                                    RECITALS
                                    --------

WHEREAS,  ITN  and  RWO  declare and warrant that they are the owners of certain
projects for transforming organic waste into electricity and/or ethanol or other
hydrocarbon  products  to  be undertaken immediately in different zones in Costa
Rica  as set forth on Exhibit "A" attached hereto and made a part hereof (herein
referred  to  as  "Projects");  and

WHEREAS,  ITN and RWO declare and warrant that they have, in hand, authorization
from  the  Costa  Rican  Government  to  develop  the  Projects;  and

WHEREAS,  CEG  is  of  the  opinion  that  it  will be able to obtain sufficient
financing,  through a joint venture arrangement with TGC and/or other companies,
to  develop  the  Projects  subject to finalization of an agreement to utilize a
certain  technology  that  will  convert  biowaste  into  electricity  and/or
hydrocarbon  products;  and

WHEREAS,  with  reference  to  the Letter Agreement of 24 November 1998, between
CEG,  ITN  and  RWO, CEG declares its interest in acquiring all of the rights to
the  Projects  and  ITN/RWO  declare their interest in selling the rights to the
Projects  to  CEG,  on  the  terms  and  conditions  contained  herein;  and
WHEREAS,  the  Parties  herewith  agree to the purchase and sale of the Projects
under  the  terms  and  conditions  set  forth  in  the  Agreement.

                                      1
<PAGE>
NOW,  THEREFORE,  IT  IS  AGREED  AS  FOLLOWS:

1.   The objective of this  Agreement is the purchase and sale of all the rights
     to the  Projects  and such  purchase  and sale is  herewith  agreed  by all
     Parties under the terms and conditions  contained herein with CEG/TGC being
     the purchaser and ITN/RWO being the seller.

2.   The  purchase   price  for  the  Projects  is  Six  Million   Dollars  U.S.
     ($6,000,000) to be paid as follows:

     A)   One Million Five Hundred Thousand Dollars U.S. ($1,500,000) to be paid
          within sixty (60) days following the date of obtaining a signed Letter
          Agreement  ("Protocol") between the Government of Costa Rica, ITN, CEG
          and/or  TGC  for  all of the  Projects  and  all  required  contracts,
          government  approvals,  permits,  and  licenses  necessary to proceed,
          without delay,  with the financing and  development of the Projects in
          the opinion of the Parties  hereto.  This amount  represents  the sunk
          costs  expended or incurred by ITN/RWO in  structuring  and developing
          the  Projects  and  ITN/RWO  shall  submit  reasonable   documentation
          supporting such sunk costs.

     2)   One Million Five Hundred Thousand Dollars U.S. ($1,500,000) to be paid
          to ITN/RWO  within  ninety (90) days  following the payment made under
          Paragraph II-A above.

     3)   An additional  Three Million  Dollars U.S.  ($3,000,000) to be paid in
          the form of common  stock in TGC at a price of Twenty  Five Cents U.S.
          ($0.25)  per  share.  The  commitment  to issue  the  shares  shall be
          delivered at the same time as the payment set forth in Paragraph  II-B
          above is made and the  stock  certificates  shall  be  issued  as soon
          thereafter  as possible.  In the event that the value of the shares at
          the time they are  committed  by TGC is in excess of Four Million Five
          Hundred Thousand Dollars U.S. ($4,500,000), the payment required under
          Paragraph II-B above shall be eliminated and not applicable under this
          Agreement.

     4)   TGC shall have the right to repurchase  all or part of any such shares
          that may be issued on a first  right of refusal  basis  within  twenty
          four (24) months of the date of issue of such shares.

     5)   The  payment  of sums  under  Paragraph(s)  II-A,  II-B and  II-C,  if
          applicable, shall be paid via wire transfer to an account number to be
          provided by ITN.

                                      2
<PAGE>
III. This  Agreement  is  specifically  conditioned  upon  TGC  receiving  Board
     approval to proceed under the terms and conditions herein. In the event TGC
     should fail to receive its Board  approval,  CEG shall  attempt,  on a best
     efforts basis, to replace TGC with another joint venture candidate. In such
     event,  CEG shall pay,  or cause to be paid,  to  ITN/RWO  the sum of Three
     Million Dollars U.S. ($3,000,000) amortized quarterly,  at an interest rate
     of ten  percent  (10%) per  annum  over a term of three  (3)  years,  or as
     otherwise  mutually  agreed,  in order to make  the  Projects  economically
     attractive  to a third party on short  notice.  In such event,  appropriate
     guarantees for fulfillment of the obligations  herein shall be delivered by
     CEG and/or such third party for review by the Parties.

IV   The  Parties  mutually  agree  that ITN shall  keep in its  possession  the
     original  of  the  Protocol  to be  signed  between  the  Parties  and  the
     Government of Costa Rica until the payment  required  under  Paragraph II-A
     above has been made.

5.   In the event  that CEG has not  reached a  written  agreement  with a third
     party  funding  source  (TGC or  other)  within  ninety  (90)  days of this
     Agreement,  this  Agreement  shall  terminate  without any  further  action
     required by any Party  hereto with no liability  whatsoever  on the part of
     any Party to this Agreement or between the Parties hereto.

VI.  General Provisions
     ------------------

     A)   This Agreement shall be construed in accordance with, and governed by,
          the laws of the State of Texas,  without giving effect to the conflict
          of laws provisions  thereof.  It is agreed that the venue of any court
          action whatsoever related to any dispute under this Agreement,  or the
          enforcement of any arbitration award hereunder,  shall be in the state
          or federal courts, as the case may be, of Harris County, Texas.

     B)   Notwithstanding  anything to the contrary contained in this Agreement,
          in the event of any dispute  between the  Parties  whatsoever  arising
          under this  Agreement,  the Parties  agree to submit  such  dispute to
          binding arbitration, to be held in Harris County, Texas. Each Party to
          the  dispute  shall  appoint  an  arbitrator,  who shall be a licensed
          attorney or licensed professional arbitrator, acting independently and
          not as an advocate or  representative of any Party. The arbitrators so
          selected shall appoint  additional  arbitrator(s) in order to have the
          minimum odd number of arbitrators.  The arbitrators shall meet, review
          all facts and  circumstances  related to the dispute and render  their
          decision  as soon as  reasonably  possible,  utilizing  the  Rules  of
          Arbitration  of the American  Arbitration  Association  for procedural
          guidance,  but not as to costs. No bond, guarantee or deposit shall be
          required to initiate arbitration proceedings under this Agreement. The
          final  decision  shall  require  the  agreement  of a majority  of the

                                      3
<PAGE>
          arbitrators,  and  shall  be  fully  binding  and  enforceable  on the
          Parties.  The Parties agree that any such decision of the  arbitrators
          shall be final and binding,  and shall not be appealed to any court of
          law of any  jurisdiction.  The costs of the arbitration shall be borne
          by the Parties in the manner as determined by the  arbitrators.  It is
          understood and agreed that any final  arbitration  award hereunder may
          be entered into any court of competent  jurisdiction in Houston, Texas
          for enforcement.

     C)   Both  Parties  agree  that,  in the  event of any  dispute  hereunder,
          service may be made upon the  Secretary of State of the State of Texas
          for purposes of service under  Paragraphs  (A) and (B) above,  and any
          such  service  shall be  considered  valid and fully  binding  for all
          purposes whatsoever.

     D)   This  Agreement  shall be held  strictly  confidential  and the  terms
          thereof shall not be disclosed to any individual or entity, other than
          a Party's employees, attorneys,  accountants, or consultants,  without
          the prior written consent of the Parties hereto.  No press releases or
          other  statements  for  publication  shall be made  without  the prior
          written consent of the Parties hereto.

     E)   Any information  obtained by any Party to this Agreement in connection
          with any client,  project, or investment  opportunity related directly
          or indirectly to that Party's activities under this Agreement shall be
          held strictly  confidential  and shall not be disclosed to anyone,  in
          any  manner  whatsoever,  without  the prior  written  consent  of the
          Parties and, where required, the disclosing party. In the event that a
          separate Confidentiality and/or Non-circumvention Agreement is entered
          into by the  Parties  in  regard to a client,  project  or  investment
          opportunity,   the   provisions   of   such   Confidentiality   and/or
          Non-circumvention  Agreement shall take precedence over the provisions
          of this Paragraph (E) in the event of any conflict or inconsistency.

     F)   The  relationship of the Parties under this  Agreement,  including all
          activities related to the execution, administration and performance of
          this  Agreement,  is  that  of  independent  principals  and  not of a
          partnership  between the Parties or the designated  representatives of
          the  Parties  in any  manner  whatsoever.  Nothing  contained  in this
          Agreement is intended or shall be construed as creating or giving rise
          to  any   relationship   between  the  Parties,   or  the   designated
          representatives  of the Parties,  of  partnership,  employer/employee,
          principal/agent or otherwise.

     G)   This  Agreement  shall not be changed,  modified or amended in any way
          except in writing,  and signed by the  authorized  representatives  of
          each of the Parties hereto.

                                      4
<PAGE>
     H)   In the event any provision of this Agreement shall be determined to be
          invalid or  non-binding  for any reason  whatsoever,  the remainder of
          this  Agreement  shall continue to be valid and in effect and shall be
          fully binding on the Parties.

     I)   In the event of a dispute,  the provisions of this Agreement  shall be
          construed  neither in favor of nor against the Party that drafted this
          Agreement.

     10)  Each Party shall hold the others harmless from and against any and all
          liabilities  associated  with or related to claims  against such Party
          prior to the effective date of this Agreement.

     11)  The Parties shall fully comply with all laws and  regulations of Costa
          Rica and the United States of America,  including the Foreign  Corrupt
          Practices Act of the United States, in all activities related directly
          or indirectly to this Agreement.

     L)   This Agreement shall be binding upon and shall inure to the benefit of
          all Parties, their successors and assigns.

     M)   This Agreement may be executed by counterpart  signatures and any such
          counterpart execution,  including facsimile execution,  shall be valid
          and fully  binding  on all  Parties  as well as their  successors  and
          assigns.

AGREED  AND  EXECUTED  THIS  13th  DAY  OF  JANUARY  1999,  EFFECTIVE  AS  OF
                           ------

01  JANUARY,  1999.

CARLTON  ENERGY  GROUP,  LLC.          TRINITY  GAS  CORPORATION

By  T. C. O'DELL  (SIGNED)             By  MICHAEL  L.  WALLACE  (SIGNED)
    -----------------------------          ------------------------------
    T.C.  O'Dell                           Michael  L.  Wallace
    Chairman and Managing Director         President

                                      5
<PAGE>
IAN  TORSTEN  NORDSTROM                    RUDOLF  OLSCHEWSKI

By IAN  NORDSTROM  (SIGNED)            By  RUDOLF  W.  OLSCHEWSKI (SIGNED)
   ------------------------                -------------------------------
   Ian  Torsten  Nordstrom                 Rudolf  W.  Olschewski
   Individual                              Individual

                                      6
<PAGE>
                                  EXHIBIT "A'

     PLANTS  FOR  CONVERSION  OF  BIOWASTE-TO-ELECTRICITY  AND/OR  ETHANOL
     ---------------------------------------------------------------------

1)     Guapuiles  Power  Plant                                50  Megawatts
       Limon  State,  Costa  Rica
       (Banana  Waste,  Palmetto  )

2)     Moin  Power  Plant                                     50  Megawatts
       Limon  State,  Costa  Rica
       (Orange, Banana, Pineapple, Wood Waste & Sludge)

3)     Sequirres  Power  Plant                                50  Megawatts
       Limon  State,  Costa  Rica
       (Banana  Waste)

4)     Quesada  Power  Plant                                  50  Megawatts
       Alajuela  State,  Costa  Rica
       (Orange  Waste)

5)     Golfito  Power  Plant                                  50  Megawatts
       Golfito  State,  Costa  Rica
       (Banana  Waste,  Pineapple  &  Palmetto)

                                      7
<PAGE>

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