Document:

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                                                                   EXHIBIT 10.81

             FIRST AMENDMENT TO THE PRODUCTION SHARING CONTRACT FOR
                 BLOCK F, OFFSHORE REPUBLIC OF EQUATORIAL GUINEA

This First Amendment to the Production Sharing Contract for Block F, offshore
Republic of Equatorial Guinea (this "Amendment") is entered into in Malabo,
Republic of Equatorial Guinea, as of the 1st day of January, 2000 (the "First
Amendment Date"), between Triton Equatorial Guinea, Inc., a Cayman Islands
company ("Triton"), Energy Africa Equatorial Guinea Limited, an Isle of Man
company ("Energy Africa"), and the Republic of Equatorial Guinea (the "STATE")
represented by the Ministry of Mines and Energy (the "MINISTRY"). Triton and
Energy Africa are hereinafter collectively referred to as the "CONTRACTOR" and
the CONTRACTOR and the STATE are sometimes, depending on the context hereinafter
individually referred to as a "Party" and collectively as the "Parties."

WHEREAS, Triton and the STATE entered into the Production Sharing Contract
covering Block F, offshore Republic of Equatorial Guinea, on March 26, 1997,
effective as of April 14, 1997;

WHEREAS, the Ministry at the request of Triton by a letter dated 29 September,
1998 granted a twelve month (12) extension to the first subperiod of the Initial
Exploration Period in Section 4.3(a) of the Production Sharing Contract (with
said extension, the "Contract");

WHEREAS, with the approval of the STATE, Triton assigned a fifteen percent (15%)
interest in its rights and obligations in the Contract to Energy Africa as of
June 1, 1999, so that currently Triton holds an eighty-five percent (85%)
interest and Energy Africa holds a fifteen percent (15%) interest in the
Contract; and

WHEREAS, at the request of the STATE, the Parties agreed to modify the Contract
for the purposes of aligning certain terms thereof with the revenue allocation
mechanisms for Production Sharing Contracts recently adopted by the STATE as
reflected in a Memorandum of Understanding between the Parties dated December 7,
1999 ("MOU").

NOW THEREFORE, in consideration of the terms and conditions set forth herein,
the Parties hereby agree as follows:

                                    ARTICLE 1
                                      SCOPE

Except as modified herein, the terms of the Contract shall remain valid and in
full force and effect.

                                    ARTICLE 2
                                   DEFINITIONS

The terms and phrases defined in the Contract and used herein shall have the
same meaning as in the Contract unless the context herein otherwise provides.
Section 1.2 (Definitions) of the Contract is amended as follows:

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2.1      Section 1.2(v) is deleted and replaced with the following: "Effective
         Date means April 14, 1997."

2.2      Section 1.2(z) (definition of Royalty) of the Contract is deleted and
         replaced with the following:

         "Royalty means for each Field, the right of the State to a percentage
         of the Crude Oil and Natural Gas produced, saved, sold and not
         otherwise utilized in Petroleum Operations that is calculated based on
         the daily production rate as reflected below:

<TABLE>
<CAPTION>
                          Rates of Daily
                        Production of Field                       Royalty Per Tranche
                        -------------------                       -------------------
         (calculated on an incremental basis of Crude Oil)
<S>                                                               <C>
                From 0 to 30,000 Barrels                                  11%
                Above 30,000 to 60,000 Barrels                            12%
                Above 60,000 to 80,000 Barrels                            14%
                Above 80,000 to 100,000 Barrels                           15%
                More than 100,000 Barrels                                 16%
</TABLE>

         and ten percent (10%) of all the Natural Gas in each Field produced,
         saved, sold and not otherwise utilized in Petroleum Operations."

2.3      The following definitions shall be added to Section 1.2 of the
         Contract.

         "(ah) First Amendment Date means January 1, 2000."

         "(ai) LIBOR means the rate of interest known as the London Interbank
         Offered Rate on one year U.S. dollar deposits as published by the
         Financial Times (London) . If the Financial Times does not publish the
         said rate during seven (7) consecutive working days, the rate published
         by the Wall Street Journal shall apply. If neither of these two rates
         are published, the Parties will mutually agree upon the rate to apply."

                                    ARTICLE 3
                      RECOVERY OF PETROLEUM OPERATING COSTS
                            AND SHARING OF PRODUCTION

3.1      Sections 7.2 through 7.4 of the Contract shall be deleted and replaced
         with the following:

         "7.2     After making Royalty payments to the STATE in accordance with
                  the provisions of Section 6.1(n) of this Contract, CONTRACTOR
                  shall be entitled to recover the totality of the Petroleum
                  Operations Expenditures relating to a Field out of seventy
                  percent (70%) of the remaining sales proceeds or other
                  distribution of Crude Oil produced and saved hereunder and not
                  used in Petroleum Operations from such Field.

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                  It is expressly understood that the Exploration Expenditures
                  incurred by CONTRACTOR during any Calendar Year not
                  attributable to a particular Field and included in the Work
                  Program and Budget of Expenditures approved by the MINISTRY
                  for said year shall be recoverable against the production from
                  any Field in the Contract Area with priority given to the last
                  discovered Field.

                  The Petroleum Operation Expenditures attributable to a
                  determined Field not recoverable by CONTRACTOR, because the
                  insufficiency of available Crude Oil in said Field, shall not
                  be transferable nor recoverable from another Field, but such
                  Expenditures shall be deductible from income for purposes of
                  calculating CONTRACTOR's Income Tax."

         "7.3     After payment of the Royalty to the STATE and the portion
                  allocated to CONTRACTOR for the recovery of recoverable
                  Petroleum Operation Expenditures by the CONTRACTOR, the
                  remaining Crude Oil produced, saved and sold from a particular
                  Field and not used in Petroleum Operations shall be referred
                  to as "Net Crude Oil".

         "7.4     The percentage of Net Crude Oil to which the STATE and
                  CONTRACTOR are entitled in a particular Field will be
                  triggered when the cumulative Crude Oil production produced,
                  saved and sold from such Field reaches the corresponding
                  tranche shown below:

<TABLE>
<CAPTION>
                            Cumulative Production               STATE Share of       CONTRACTOR Share of
                               Levels of Field                  Net Crude Oil            Net Crude Oil
                            ---------------------               --------------       -------------------

<S>                                                             <C>                  <C>
                  From 0 to 200 MMBO                                  20%                    80%
                  Above 200 to 350 MMBO                               30%                    70%
                  Above 350 to 450 MMBO                               40%                    60%
                  Above 450 to 550 MMBO                               50%                    50%
                  More than 550 MMBO                                  60%                    40%"
</TABLE>

                  MMBO means one million Barrels of Crude Oil."

3.2      In the first sentence of Section 8.1(b) of the Contract delete "Except
         for the Royalty,".

3.3      Article II, paragraph 2(h) of Annex "C" (Accounting Procedure) to the
         Contract is hereby deleted and replaced with:

         "(h) The full amount of interest on loans shall be considered
         deductible non-capital expenditures for purposes of the Income Tax;
         however, such interest, prior to the First Amendment Date, shall be
         recoverable to a maximum of three percent (3%). As of the First
         Amendment Date such interest shall be recoverable to a maximum of LIBOR
         plus four (4%) percentage points."

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3.4      A new paragraph 2(i) to Article II in Annex "C" (Accounting Procedure)
         to the Contract will be added as follows:

         "(i) Expenses of the MINISTRY personnel working on full-time basis in
         CONTRACTOR's home office or other principal office or on temporary
         assignment to such offices."

3.5      Article III, paragraph 3 of Annex "C" (Accounting Procedure) to the
         Contract is amended as of the First Amendment Date by deleting the
         first sentence and replacing it with the following:

         "All interest on loans obtained by an entity comprising part of the
         CONTRACTOR other than the STATE shall be considered deductible;
         however, such interest will be recoverable only as permitted in Article
         II.2(h) of this Annex "C"."

                                    ARTICLE 4
                               PRODUCTION BONUSES

4.1      Sections 9.2 and 9.3 of the Contract shall be deleted and replaced with
         the following:

         "9.2     On the date of declaration of a Commercial Discovery with
                  respect to a Field, the CONTRACTOR shall pay the STATE the sum
                  of Seven Hundred Fifty Thousand United States Dollars (U.S.
                  $750,000). Such payment will not be cost recoverable."

         "9.3     CONTRACTOR shall pay the STATE a one-time payment of Three
                  Million United States Dollars (U.S. $3,000,000) after daily
                  production from a Field averages for the first time thirty
                  thousand (30,000) Barrels per day for a period of sixty (60)
                  consecutive calendar days; CONTRACTOR shall make a further
                  one-time payment to the STATE of Three Million United States
                  Dollars (U.S. $3,000,000) after daily production from a Field
                  averages for the first time sixty thousand (60,000) Barrels
                  per day for a period of sixty (60) consecutive calendar days.

                  CONTRACTOR shall make an additional one-time payment to the
                  STATE of Four Million United States Dollars (U.S. $4,000,000)
                  after daily production from a Field averages for the first
                  time one hundred thousand (100,000) Barrels per day for a
                  period of sixty (60) consecutive calendar days.

                  All payments under this Section 9.3 shall be made within
                  thirty (30) calendar days following the last day of the
                  respective sixty (60) calendar day period and will be cost
                  recoverable."

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                                    ARTICLE 5
                       ASSIGNMENT AND TRANSFER OF INTEREST

Sections 6.1(e) and 6.1(f) of the Contract shall be deleted and replaced with
the following:

         "(e)     have the right, with prior notification to the MINISTRY, to
                  sell, assign, transfer, convey or dispose of any part or all
                  of the rights and interests and obligations under this
                  Contract or in any Field in the Contract Area to any
                  Affiliated Company;"

         "(f)     have the right to sell, assign, transfer, convey or dispose of
                  all or any part of its rights and interests and obligations
                  under this Contract or in any Field in the Contract Area to
                  parties other than Affiliated Companies with the prior consent
                  of the MINISTRY, which consent shall not be unreasonably
                  withheld, and shall be deemed granted if the MINISTRY does not
                  respond to such entity within sixty (60) calendar days of the
                  date of confirmed receipt by the Ministry of the request for
                  its consent.

                  The gain, taxable profit or appreciation realized from any
                  transfer, sale or assignment shall be taxed in accordance with
                  the tax legislation and regulations in effect in the Republic
                  of Equatorial Guinea on the Effective Date. However, when said
                  transfers, sales or assignments by Triton Equatorial Guinea,
                  Inc. or Energy Africa Equatorial Guinea Limited or their
                  respective Affiliated Companies, as the transferor, involve a
                  cash consideration, then the gain, taxable profit or
                  appreciation realized from such transfer, sale or assignment
                  shall be taxed at a rate of fifteen percent (15%) payable by
                  the transferor;"

                                    ARTICLE 6
                                    TAXATION

6.1      Section 6.1(m) of the Contract shall be deleted and replaced with the
         following language:

                  "(m) pay to the STATE the corresponding income taxes in
                  accordance with the Tax Law subject to the terms of Sections
                  6.1(f), 6.2(a) and 16.3 of this Contract as it is amended;"

6.2      A new paragraph 3 shall be added to Section 16 as follows:

         "16.3 The STATE guarantees the stability of this Contract's fiscal
         terms during the term of the Contract. Nevertheless, in the event of a
         change in the currently existing tax conditions as of the Effective
         Date in Equatorial Guinea or the sub-region of Central African Economic
         and Monetary Community ("CEMAC"), then the Parties shall at the written
         request of one Party meet promptly to resolve any imbalance resulting
         from such changes.

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         If the Parties are unable to reach a resolution within a period of six
         (6) months from the date a Party first requests such resolution, the
         arbitration and consultation provisions of Section XIII of this
         Contract shall apply, whereby the arbitrators shall determine an
         adjustment of the production share as determined under Section 7 of
         this Contract to resolve the imbalance."

                                    ARTICLE 7
                                   OPERATIONS

7.1      Section 2.7 of the Contract shall be deleted and replaced with the
         following language:

         "2.7 This Contract will continue in existence with respect to each
         Field for a period of thirty (30) years with respect to Crude Oil and
         for forty (40) years with respect to Natural Gas starting from the date
         the MINISTRY approves CONTRACTOR'S report or said report is considered
         as approved, in accordance with the provisions of Section 2.6, and
         CONTRACTOR receives approval from the MINISTRY.

         In case of new Commercial Discoveries that underlie or overlie, in
         whole or in part, the area of an existing Field or any extension
         thereof, such new Commercial Discoveries together with such Field will,
         subject to Section 2.6(a) of this Contract, constitute only one Field
         subject to the following:

         (a)      The redefinition of any area of development of a Field shall
                  always be subject to the submittal by CONTRACTOR to the
                  MINISTRY of pertinent relevant technical evidence that
                  warrants said redefinition, the approval of which shall not be
                  unreasonably denied by the MINISTRY.

         (b)      In the case of any new Commercial Discovery which, at the time
                  of its being determined by the CONTRACTOR pursuant to Section
                  2.5 of this Contract to be a Commercial Discovery, underlies
                  or overlies, in whole or in part, the area of development of
                  an existing Field as it may by that time have been extended
                  pursuant to Section 2.6(a) of this Contract, shall be treated
                  as an integral part of such existing Field which will be
                  defined or redefined as may be necessary to incorporate all of
                  such new underlying and overlying Commercial Discoveries.

         (c)      In the case of any new Commercial Discovery which, at the time
                  of its being determined by the Contractor pursuant to Section
                  2.5 of this Contract to be a Commercial Discovery, does not
                  underlie or overlie, in whole or in part, the area of
                  development of an existing Field as it may by that time have
                  been extended pursuant to Section 2.6(a) of this Contract,
                  such new Commercial Discovery shall constitute a separate
                  Field.

         (d)      In the event of subsequent extensions to the area of any such
                  new Commercial Discovery as referred to in Section 2.7(c) as a
                  separate Field extending into an area overlying or underlying
                  an area of development of another Field, such subsequent
                  extensions shall not affect the new Commercial Discovery's
                  status as a separate Field.

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         The provisions of Section 2.6 shall apply mutatis mutandis to any such
new Commercial Discovery."

7.2      Section 4.7 of the Contract is hereby amended by inserting language at
         the end of this Section as follows:

          "The Parties recognize that the results acquired as Petroleum
         Operations advance or that certain changes of circumstances may justify
         changes to the Work Program and Budget of Petroleum Operations
         Expenditures. Under such circumstances, CONTRACTOR will submit a
         revision to the approved Work Program and Budget for that Calendar Year
         to the MINISTRY for approval in accordance with the terms of Section
         4.6 of this Contract. Such approval will not be unreasonably withheld.
         Upon approval as provided in Section 4.6 of this Contract by the
         MINISTRY of such revision to the relevant Work Program and Budget, the
         expenditures made by CONTRACTOR in relation to such revised Budget will
         be considered Petroleum Operation Expenditures. Notwithstanding the
         foregoing, CONTRACTOR's expenditures up to ten percent (10%) above the
         total of the approved Budget amount (as may be revised and approved
         from time to time) for said Calendar Year will be recoverable Petroleum
         Operations Expenditures. CONTRACTOR's expenditures that exceed ten
         percent (10%) above total of the approved Budget (as revised and
         approved) will not be recoverable or deductible from income for
         purposes of calculating CONTRACTOR's Income Tax."

                                    ARTICLE 8
                 RIGHTS AND OBLIGATIONS OF THE PARTIES; TRAINING

8.1      As of the First Amendment Date, Section 6.1(j) of the Contract shall be
         deleted and replaced by the following:

         "(j)     as of the First Amendment Date, include in the Annual Work
                  Program and Budget of Petroleum Operations Expenditures the
                  sum of Two Hundred Fifty Thousand United States Dollars (U.S.
                  $250,000) to be spent on (i) training personnel of the
                  MINISTRY and citizens of the Republic of Equatorial Guinea,
                  who are not personnel of CONTRACTOR at such time, for
                  professional, skilled and technical jobs in Petroleum
                  Operations or (ii) for all costs related to attendance at
                  professional or industry conferences, institutes or similar
                  events, whether regional or international, for the enhancement
                  of the knowledge or the skills of such persons or the
                  promotion of the oil and gas industry of the Republic of
                  Equatorial Guinea. In fulfillment of CONTRACTOR's obligation
                  under this Section 6.1(j), the CONTRACTOR will remit Sixty-Two
                  Thousand Five Hundred United States Dollars (U.S. $62,500) to
                  the MINISTRY at the beginning of each Calendar Quarter.

                  The MINISTRY agrees to be responsible for the implementation
                  and direct funding of the referenced training programs or
                  events. The sums paid by CONTRACTOR pursuant to this Section
                  6.1(j) will be included as cost recoverable Petroleum
                  Operations Expenditures.

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                  CONTRACTOR shall make all reasonable efforts to employ and
                  train citizens of the Republic of Equatorial Guinea in
                  Petroleum Operations. CONTRACTOR may employ non-citizens, if
                  in the opinion of CONTRACTOR and not contested by the
                  MINISTRY, no Equatorial Guinean citizens can be found with
                  sufficient skill and technical qualifications. CONTRACTOR
                  shall make similar requirements of any subcontractor. At
                  intervals of not more than one year CONTRACTOR shall submit to
                  the MINISTRY reports detailing the personnel employed, the
                  position or function they perform and their residence when
                  employed. CONTRACTOR shall provide, as CONTRACTOR deems,
                  necessary, on-the-job training for citizens of the Republic of
                  Equatorial Guinea to undertake skilled and technical jobs in
                  the Petroleum Operations. Costs and expenses of training
                  citizens of Equatorial Guinea as well as costs and expenses
                  for a program of training for the MINISTRY's personnel, shall
                  be included in Petroleum Operation Expenditures."

8.2      Effective from the date that the Parties hereto execute this Amendment
         as indicated below, a Section 6.5 will be added to the Contract as
         follows:

         "6.5     If, in connection with CONTRACTOR's performance of its
                  obligations under this Contract, or if circumstances emerged
                  regarding this Contract other than as provided in Section
                  6.1(j) of this Contract, any employee or official of the
                  STATE, including the MINISTRY's personnel, is required to
                  travel to any location outside the Republic of Equatorial
                  Guinea, and the STATE agrees, through the MINISTRY, to permit
                  such employee or official to travel for such purposes,
                  CONTRACTOR agrees, subject to the prior mutual agreement of
                  the Parties to such travel, to pay the following amounts to
                  the MINISTRY, on behalf of the STATE, for the travel expenses
                  related to the participation of such employees or officials:

                  (a)      the actual expenses incurred for travel to the
                           location outside of the Republic of Equatorial Guinea
                           and for travel to return to the Republic of
                           Equatorial Guinea and lodging of such employees or
                           officials at the foreign location, and

                  (b)      an amount equal to the following for each day such
                           employee or official is out of the Republic of
                           Equatorial Guinea in accordance with the request of
                           CONTRACTOR:

                           (i)      for a Minister or comparable or more senior
                                    official of the government of the Republic
                                    of Equatorial Guinea (the "Government"): US$
                                    350.00;

                           (ii)     for a Secretary of State or comparable
                                    official of the Government: US$ 325.00;

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<PAGE>   9

                           (iii)    for a Director General, Secretary General,
                                    Regional Delegate of the STATE or comparable
                                    employee or official of the Government: US$
                                    300.00;

                           (iv)     for a Department Chief of the MINISTRY or
                                    comparable official of the Government: US$
                                    250.00; or

                           (v)      for Engineers, Geo-scientists, Economists,
                                    and Attorneys of the MINISTRY and all other
                                    employees or comparable officials of the
                                    Government: US$ 200.00.

The amounts contemplated pursuant to this Section 6.5 shall be payable by
CONTRACTOR by check made out to the MINISTRY in the resulting total amount.
Notwithstanding the foregoing, with respect to the actual travel and lodging
expenses provided by Section 6.5(a), CONTRACTOR may choose to pay such amounts
directly to the provider of such services for travel and lodging. The sums paid
by CONTRACTOR pursuant to this Section 6.5 will be included as cost recoverable
Petroleum Operations Expenditures."

                                    ARTICLE 9
                                     NOTICES

The notice provision of Section 15.1 of the Contract is amended to substitute
the Triton information below for notice purposes and to add Energy Africa as a
PARTY under CONTRACTOR as follows:

         "Triton Equatorial Guinea, Inc.
         c/o Triton Energy
         6688 North Central Expressway, Suite 1400
         Dallas, Texas 75206 USA
         Attention: Mr. Brian Maxted
         Telecopy: 1-214 365-9011
         Telephone: 1-214 696-7554"

         "Energy Africa Equatorial Guinea Limited
         5 Parliament Square
         Castletown
         Isle of Man IM9 1LA UK
         Attention: Rupert Worsdale
         Telecopy: 44-1624827301
         Telephone: 44-1624827310"

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                                   ARTICLE 10
                                  MISCELLANEOUS

10.1     Each of the Parties shall carry out all acts and measures as shall be
         necessary to fully perform and carry out this Amendment.

10.2     This Amendment constitutes the entire agreement among the Parties and
         may not be amended or modified except by a written document signed by
         the Parties. In the event of any conflict between the provisions of
         this Amendment and the Contract with respect to the subject matter
         hereof, the provisions of this Amendment shall prevail.

10.3     This Amendment shall inure to the benefit of and be binding upon the
         successors and assigns of the Parties.

10.4     This Amendment shall become effective as of the date it is signed by
         the Parties and shall have the force of law with retroactive effect as
         of 1 January 2000.

10.5     This Amendment is written and signed in six (6) copies, three (3) in
         Spanish and three (3) in English that shall constitute a single
         original. In the event of a conflict over the interpretation or
         implementation of the contents of this Amendment, the Spanish text
         shall prevail.

10.6     In the event of a dispute arising out of or related to the
         interpretation or meaning of this Amendment, the Consultation and
         Arbitration provisions of Section XIII of the Contract shall apply.

IN WITNESS WHEREOF, the Parties hereto execute this Amendment on the day and
year below indicated.

FOR THE REPUBLIC OF EQUATORIAL GUINEA

THE MINISTRY OF MINES AND ENERGY OF
THE REPUBLIC OF EQUATORIAL GUINEA

-----------------------------------------

Name:
       ----------------------------------

Title:
       ----------------------------------

Date:
       ----------------------------------

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CONTRACTOR:

TRITON EQUATORIAL GUINEA, INC.

-----------------------------------------

Name:
       ----------------------------------

Title:
       ----------------------------------

Date:
       ----------------------------------

ENERGY AFRICA EQUATORIAL GUINEA LIMITED

-----------------------------------------

Name:
       ----------------------------------

Title:
       ----------------------------------

Date:
       ----------------------------------

Page 11 of 11<PAGE>   1

                                                                   EXHIBIT 10.82

                        ASSIGNMENT OF STATE PARTICIPATING
                 INTEREST IN THE PRODUCTION SHARING CONTRACT FOR
                 BLOCK F, OFFSHORE REPUBLIC OF EQUATORIAL GUINEA

This Assignment of State Participating Interest in the Production Sharing
Contract for Block F, Offshore Republic of Equatorial Guinea (this "Assignment")
that sets the terms and conditions for the participation of the STATE in Block F
offshore the Republic of Equatorial Guinea (the "STATE") is entered into as of
the 1st day of January, 2000, between Triton Equatorial Guinea, Inc., a Cayman
Islands company ("Triton"), and Energy Africa Equatorial Guinea Limited, an Isle
of Man company ("Energy Africa"), and the STATE represented by the Ministry of
Mines and Energy. Triton and Energy Africa are hereinafter collectively referred
to as the "CONTRACTOR" and the CONTRACTOR and the STATE are sometimes, depending
on the context hereinafter individually referred to as a "Party" and
collectively as the "Parties."

WHEREAS, Triton and the State signed a Production Sharing Contract covering
Block F, offshore Republic of Equatorial Guinea, on March 26, 1997, effective as
of April 14, 1997 (as amended, the "Contract");

WHEREAS, with the approval of the STATE, Triton assigned a fifteen percent (15%)
interest in its rights and obligations in the Contract to Energy Africa as of
June 1, 1999, so that currently Triton holds an eighty-five percent (85%)
interest and Energy Africa holds a fifteen percent (15%) interest in the
Contract;

WHEREAS, at the request of the STATE, the Parties agreed to modify the Contract
effective January 1, 2000 by that certain First Amendment to the Production
Sharing Contract for Block F, offshore Republic of Equatorial Guinea (the "First
Amendment") for the purposes of aligning certain terms thereof as reflected in a
Memorandum of Understanding between the Parties dated December 7, 1999;

WHEREAS, as a consequence of the renegotiation the CONTRACTOR agreed to transfer
to the STATE a five percent (5%) interest during the phases of Development and
Production in each Field discovered and developed, or that may be discovered
and/or developed under the Contract together with all rights and interests
related thereto, provided however, the STATE shall not be required to contribute
cash to fund such costs; and

WHEREAS, the STATE accepts such interest and agrees to become a party to the
existing Joint Operating Agreement for each Field Development and Production
between the entities then comprising the CONTRACTOR (the "Field JOA") on the
terms set forth herein, each Party having in their possession a copy of the
Field JOA.

NOW THEREFORE, in consideration of the terms and conditions set forth herein,
the Parties hereby agree as follows:

<PAGE>   2

                                    ARTICLE 1
                             ASSIGNMENT OF INTEREST

1.1  "Participating Interest" means a percentage interest in the rights,
     privileges, duties and obligations of the CONTRACTOR under the Contract as
     amended from time to time.

1.2  Subject to the terms and conditions set forth in this Assignment:

     (a)  CONTRACTOR hereby assigns, transfers and conveys to STATE a five
          percent (5%) Participating Interest in each Field discovered and/or to
          be discovered in the Contract Area, and in the Field JOA corresponding
          to such Field, these assignments to become effective upon the approval
          of the initial development and production plan for each area of
          development of such Field; and

     (b)  The STATE accepts from CONTRACTOR the assignment, transfer and
          conveyance of such five percent (5%) Participating Interest in each
          such Field and interest in such Field JOA corresponding to this
          interest. Such acceptance shall constitute consent by the STATE to the
          transfer as required by Section 6.1(f) of the Contract.

1.3  The assignment, transfer and conveyance referred to herein shall be free of
     all liens, claims, mortgages and encumbrances except those arising out of
     the Contract, this Assignment or the Field JOA and subject to Article 4
     below, shall include five percent (5%) of CONTRACTOR's interests in data,
     materials, equipment and other assets acquired in connection with all
     Development and Production Operations for each Field.

1.4  The assignment, transfer and conveyance referred to herein also shall be
     made on a pro rata basis from each entity then comprising CONTRACTOR equal
     to its Participating Interest unless otherwise mutually agreed by such
     entities.

1.5  As of the effective date of each assignment of an interest in a Field, the
     Participating Interests of the entities comprising the CONTRACTOR in such
     Field shall be:

                    STATE                    5.00%
                    Triton                  80.75%
                    Energy Africa           14.25%

     Triton and Energy Africa, and their respective successors and assigns (if
     any), and the STATE shall constitute the "CONTRACTOR" with respect to such
     Field, in the sense ascribed to this term in the Contract and shall be
     bound by all the covenants contained in the Contract which are binding on
     the CONTRACTOR according to their respective Participating Interests, with
     the exception of the provisions set forth in Articles 2, 4 and 5 below. If
     Triton or Energy Africa transfers, from time to time, all or part of its
     Participating Interest as permitted by the Contract and this Assignment
     after the Amendment Date, but prior to the assignment to the STATE of the
     five

<PAGE>   3

     percent (5%) Participating Interest in a Field under this Assignment, then
     the Participating Interest of Triton and Energy Africa shown above shall be
     revised accordingly.

                                    ARTICLE 2
                   CARRIED PARTICIPATING INTEREST OF THE STATE

2.1  All Petroleum Operations Expenditures, as defined in the Contract shall
     continue to be borne and paid by the entities, other than the STATE,
     constituting part of the CONTRACTOR in the same ratio as their respective
     Participating Interests prior to the assignment referred to in Article 1
     above (e.g., 85% by Triton and 15% by Energy Africa or as to their
     successor and assigns). The STATE shall not be required to contribute cash
     to fund Petroleum Operations Expenditures.

2.2  The STATE hereby assigns, transfers and conveys to the entities comprising
     part of the CONTRACTOR (i.e., Triton and Energy Africa, and their
     respective successors and assigns), other than the STATE, in proportion to
     their Participating Interests in the Field at the time of the assignment
     under Article 1 of this Assignment all rights to the recovery of
     recoverable Petroleum Operations Expenditures under the Contract and Field
     JOA in respect of the STATE's five percent (5%) Participating Interest
     acquired under Article 1 of this Assignment.

                                    ARTICLE 3
         JOINT OPERATING AGREEMENT FOR FIELD DEVELOPMENT AND PRODUCTION

3.1  The STATE hereby ratifies and confirms its participation in the Field JOA
     with respect to each Field in which it acquires an interest. The Field JOA
     shall apply severally, sequentially and automatically to every Field under
     development or developed under the Contract.

3.2  Triton and Energy Africa agree amongst themselves as the entities
     comprising the CONTRACTOR to conduct operations in each Field pursuant to
     the Contract, this Assignment and the Field JOA. The Parties acknowledge
     that Triton has been designated as Operator under the Field JOA and such
     designation shall not be affected by this Assignment.

3.3  The STATE's participation as a party comprising part of the CONTRACTOR
     under the Field JOA with respect to each Field shall be effective as of the
     effective date of the assignment of an interest in such Field pursuant to
     Article 1 of this Assignment and the STATE as a member of the CONTRACTOR
     ratifies and confirms on such effective date the conduct of the operations
     in each area of development of a Field pursuant to the Contract.

<PAGE>   4

                                    ARTICLE 4
                               TITLE TO EQUIPMENT

Notwithstanding anything contained in Section XI of the Contract and Article 1.3
above, the STATE shall have no rights, titles or interests in any unamortized
equipment of the CONTRACTOR referred to in Section 11.2 of the Contract.

However, any equipment and fixed installations amortized before the expiration
of the Contract shall be treated pursuant to Section 11.1.

                                    ARTICLE 5
                                  ASSIGNABILITY

5.1  Notwithstanding Section 6.1(e) of the Contract, in the case of the STATE as
     the assigning party of the five percent (5%) Participating Interest it
     acquired under Article 1 of this Assignment, the right to sell, assign,
     transfer, convey or otherwise dispose of any part or all of such
     Participating Interest in any Field in the Contract Area, from time to
     time, is limited solely to a sale, assignment, transfer, conveyance or
     disposition to the national oil company or other wholly-owned STATE entity
     responsible (among other things) for the development and production of
     Hydrocarbon deposits in the Contract Area, with no other right of
     assignment except to assignees that meet the requirements stated in this
     Article 5.1.

5.2  Notwithstanding Section 6.1(f) of the Contract, the Parties agree that the
     STATE shall have no right to sell, assign, transfer, convey or otherwise
     dispose of any interest either in the Contract, this Assignment, any Field
     in the Contract Area or Field JOA except as provided in Article 5.1 above.

                                    ARTICLE 6
                                  MISCELLANEOUS

6.1  Each of the Parties shall do all such acts and obtain and execute all such
     documents as shall be reasonably required in order to fully perform and
     carry out this Assignment.

6.2  This Assignment constitutes the entire agreement among the Parties and may
     not be amended or modified except in writing signed by all of the Parties.
     In the event of any conflict between the provisions of this Assignment and
     the Field JOA with respect to the subject matter covered in this
     Assignment, the provisions of this Assignment shall prevail. The terms and
     phrases contained in the Contract and used herein shall have the same
     meaning as in the Contract as amended unless the context herein otherwise
     provides.

6.3  This Assignment shall inure to the benefit of and be binding upon the
     successors and assigns of the Parties.

6.4  Upon signature by the Parties hereto, this Assignment shall have effect for
     all purposes from 1st January 2000.

<PAGE>   5

6.5  This Assignment is written signed in six (6) copies, three (3) in Spanish
     and three (3) in English, which shall constitute one original document. In
     the event of a conflict between the English and Spanish texts, the Spanish
     text shall prevail. The Parties recognize, however, that the Field JOA
     attached as Annex A hereto, is written solely in the English language.

6.6  In the event of a dispute arising out of or related to the interpretation
     or meaning of this Assignment (excluding the Field JOA attached hereto as
     Annex A), the Consultation and Arbitration provisions of Section XIII of
     the Contract shall apply.

IN WITNESS WHEREOF, the Parties hereto have executed this Assignment as of the
day and year first above written.

TRITON EQUATORIAL GUINEA, INC.

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Name:
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Title:
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Date:
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ENERGY AFRICA EQUATORIAL GUINEA LIMITED

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Name:
     -------------------------------
Title:
      ------------------------------
Date:
     -------------------------------

FOR THE REPUBLIC OF EQUATORIAL GUINEA

THE MINISTRY OF MINES AND ENERGY OF
THE REPUBLIC OF EQUATORIAL GUINEA

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Name:
     -------------------------------
Title:
      ------------------------------
Date:
     -------------------------------

<PAGE>   6

                                     ANNEX A

                   ATTACHED TO AND MADE PART OF THE ASSIGNMENT
                OF STATE PARTICIPATING INTEREST IN THE PRODUCTION
               SHARING CONTRACT FOR BLOCK F, OFFSHORE REPUBLIC OF
                        EQUATORIAL GUINEA, BY AND BETWEEN
     TRITON EQUATORIAL GUINEA, INC., ENERGY AFRICA EQUATORIAL GUINEA LIMITED
       AND THE REPUBLIC OF EQUATORIAL GUINEA, DATED AS OF JANUARY 1, 2000

                            JOINT OPERATING AGREEMENT
                      FOR FIELD DEVELOPMENT AND PRODUCTION

                                     BLOCK F
                           OFFSHORE EQUATORIAL GUINEA

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