Document:

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                                                                   Exhibit 10.49

                                                      ISIN No. XS0167566016
                                                      Common Code  016756601
                                                      Swiss Security No. 1595470

     NEITHER THIS NOTE NOR THE SHARES OF COMMON STOCK ISSUABLE ON CONVERSION OF
THIS NOTE (THE "SHARES") HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
AS AMENDED (THE "SECURITIES ACT"), OR THE SECURITIES LAWS OF ANY STATE. THE
HOLDER HEREOF, BY PURCHASING THIS NOTE, AGREES FOR THE BENEFIT OF THE COMPANY
THAT THIS NOTE AND THE SHARES MAY NOT BE RESOLD, PLEDGED OR OTHERWISE
TRANSFERRED OR DISPOSED OF UNLESS THE NOTE OR THE SHARES AS THE CASE MAY BE, HAS
BEEN REGISTERED UNDER THE SECURITIES ACT AND ANY APPLICABLE STATE SECURITIES OR
BLUE SKY LAWS OR EXEMPTIONS FROM THE REGISTRATION REQUIREMENTS OF SUCH LAWS ARE
AVAILABLE.

     IF THE HOLDER OF THIS NOTE WAS AN AFFILIATE OF THE COMPANY AT ANY TIME
DURING THE THREE MONTHS PRECEDING THE DATE OF ANY SUCH TRANSFER, THE FOREGOING
CONDITIONS MUST BE COMPLIED WITH REGARDLESS OF WHEN SUCH TRANSFER IS MADE.

     ANY UNITED STATES PERSON WHO HOLDS THIS OBLIGATION WILL BE SUBJECT TO
LIMITATIONS UNDER THE U.S. INCOME TAX LAWS, INCLUDING THE LIMITATIONS PROVIDED
IN SECTIONS 165(j) AND 1287(a) OF THE UNITED STATES INTERNAL REVENUE CODE OF
1986, AS AMENDED.

     THIS OBLIGATION IS NOT A DEPOSIT AND IS NOT INSURED BY ANY AGENCY OF THE
UNITED STATES GOVERNMENT.

                            HARKEN ENERGY CORPORATION
                 7% SENIOR CONVERTIBLE NOTES DUE 2007, SERIES F

                                   GLOBAL NOTE

     Harken Energy Corporation, a Delaware corporation (hereinafter, the
"Company," which term includes any successor to the Company), for value
received, hereby promises to pay to The Bank of New York Depository (Nominees)
Limited, upon presentation and surrender of this Global Note (the "Global Note")
the principal sum of SEVEN HUNDRED TWENTY THOUSAND DOLLARS (U.S. $720,000) (the
"Principal Amount") on March 31, 2007, and to pay interest thereon from and
including May 23, 2003, semi-annually in arrears on September 30 and March 31 in
each year, commencing September 30, 2003 (each an " Interest Payment Date"), at
the rate of 7% per annum, calculated on the basis of a 360-day year consisting
of twelve 30-day months, until the principal hereof is paid or payment thereof
is duly provided for; provided, however, that the Principal Amount payable upon
presentation and surrender may be reduced from time to time in connection with
conversions, redemptions, purchases, cancellations and similar events described
in the Terms and Conditions hereof, and such reductions shall be duly noted on
Schedule A hereto (which is incorporated herein by this reference as if set out
in full); and provided further that interest accruing after the date of a
reduction in Principal Amount shall be calculated with reference to the new
Principal Amount. While the Notes are registered in the name of the Common
Depository, payments of interest on each Note shall be paid by the Paying Agent
on each Interest

                                                                               1

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Payment Date, commencing September 30, 2003, to the Holder of such Note as shown
on the Note Register at the close of business on the applicable Record Date,
such payment to be made in accordance with the rules and procedures of Euroclear
or Clearstream, as the case may be.

     Upon failure of the Company to make any payment of interest or principal on
the date when due and payable, the outstanding principal balance of the Notes
and, to the extent permitted by law, interest thereon will bear interest at the
Default Rate beginning on the date such payment was due until the default is
cured.

     Notwithstanding any other provision of the Notes to the contrary, in no
event shall the interest contracted for, charged or received in connection with
the Notes (including any other costs or considerations that constitute interest
under applicable law which are contracted for, charged or received pursuant to
the Notes) exceed the maximum rate of nonusurious interest allowed under
applicable law as presently in effect and to the extent an increase is allowable
by such laws, but in no event shall any amount ever be paid or payable greater
than the amount contracted for in the Notes, and all amounts paid by the Company
which constitute usurious interest under the applicable law shall be applied in
the manner described herein.

     To the extent permitted by law, interest contracted for, charged or
received on the Notes shall be allocated over the entire term of the Notes, to
the end that interest paid on the Notes does not exceed the maximum amount
permitted to be paid thereon by law.

     The principal and interest on the definitive Notes shall be payable at the
office or agency of the Company maintained for such purpose in the City of
London and the City of New York, New York, or at such other office of agency of
the Company as may be maintained for such purpose.

     This Global Note has been issued pursuant to resolutions adopted by the
Board of Directors of the Company on November 7, 2002. This Global Note is a
permanent security and is exchangeable in whole for definitive Notes in bearer
form, with interest coupons attached, upon the event specified in the Terms and
Conditions herein.

     Until transferred in full for the definitive Notes in certificated form,
this Global Note shall in all respects be ratably entitled to the same benefits
under, and subject to the same Terms and Conditions of the definitive Notes
authenticated and delivered hereunder.

     This Global Note, the definitive Notes, and the Terms and Conditions shall
be governed by and construed in accordance with the laws of the State of New
York.

     Unless the certificate of authentication hereon has been executed by the
Authenticating Agent by manual signature of one of its authorized signatories,
this Global Note shall not be entitled to any benefit under the Terms and
Conditions and shall not be valid or obligatory for any purpose.

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     IN WITNESS WHEREOF, the Company has caused this book-entry Note to be duly
executed in its corporate name by the manual or facsimile signatures of the
undersigned duly authorized officers of the Company.

Dated as of May 23, 2003.

                                        HARKEN ENERGY CORPORATION

                                        By:
                                           -------------------------------------
                                              Anna M. Williams, Executive Vice
                                              President-Finance and Chief
                                              Financial Officer

[Corporate Seal]

ATTEST:

By:
   ----------------------------------------------------------------
    A. Wayne Hennecke, Senior Vice President-Finance and Secretary

                          CERTIFICATE OF AUTHENTICATION

     This Global Note is the Note referred to in the within mentioned Terms and
Conditions.

                                        THE BANK OF NEW YORK,
                                        Authenticating Agent

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

                                                                               3

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                       TERMS AND CONDITIONS OF THE NOTES

     The U.S. $720,000 of 7% Senior Convertible Notes Due 2007, Series F (the
"Notes") of Harken Energy Corporation, a Delaware corporation (the "Company")
are constituted by, and authorized to be issued pursuant to these Terms and
Conditions and resolutions of the Board of Directors of the Company adopted on
November 7, 2002.

     Copies of a paying and conversion agency agreement dated as of May 23, 2003
(the "Agency Agreement"), made between the Company and The Bank of New York, as
paying and conversion agent (the "Paying Agent and "Conversion Agent,"
respectively, which expressions shall include any successors and assigns) are
available for inspection during normal business hours by the holders of the
Notes ("Noteholders") and the Couponholders at the specified office of the
Paying Agent. The Noteholders are entitled to the benefit of, are bound by, and
are deemed to have notice of all the provisions of the Agency Agreement.

     Certain terms not otherwise defined in the text hereof are defined in
Condition 19 herein.

1.   Form, Denominations, and Title, and Certain Administrative Provisions

     (A)  The Notes if issued in definitive bearer form will be serially
numbered, in denominations of U.S. $1,000 or multiples thereof (the "Authorized
Denomination"), each with Coupons attached on issue, and with such numerical and
other identification designation as the Company shall deem desirable.

     (B)  Title to the Notes and to the Coupons in certificated form will pass
by delivery. The Company and the Paying Agent and Conversion Agent may (to the
fullest extent permitted by applicable laws) deem and treat the Holder of any
Note and the Holder of any Coupon as the absolute owner thereof for all purposes
(whether or not the Note or Coupon shall be overdue and notwithstanding any
notice to the contrary).

     Beneficial interests in the Notes will be represented by a global note (the
"Global Note"), without interest coupons, which will be deposited with a common
depository (the "Common Depository") and held on behalf of Morgan Guaranty Trust
Company of New York, as operator of the Euroclear System ("Euroclear"), and
Clearstream, societe anonyme ("Clearstream"), for credit to the accounts
designated by the Noteholders at Euroclear and Clearstream. Except as provided
herein, certificates will not be issued in exchange for beneficial interests in
this Global Note.

     (C)  The Notes shall be executed on behalf of the Company by its Vice
President-Finance and Chief Financial Officer under its corporate seal or a
facsimile of such seal reproduced thereon and attested by its Senior Vice
President-Finance and Secretary or an Assistant Secretary. The signature of any
of these officers on the Notes may be manual or facsimile signatures of the
present or any future such authorized officer and may be imprinted or otherwise
reproduced on the Notes.

     Notes bearing the manual or facsimile signatures of individuals who were at
any time the proper officers of the Company shall bind the Company,
notwithstanding that such individuals or any of them have ceased to hold such
offices prior to the authentication and delivery of such Notes or did not hold
such offices at the date of such Notes.

     At any time and from time to time hereafter, the Company may deliver Notes
executed by the Company to the Authenticating Agent for authentication, together
with a Company order for the authentication and delivery of such Notes, and the
Authenticating Agent in accordance with such Company order shall authenticate
and deliver such Notes. Such Company order shall specify the amount of Notes to
be authenticated and the date on which the original issue of Notes is to be
authenticated.

     The Global Note shall be dated as of the date of authentication.

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     No Note shall be entitled to any benefit hereunder or be valid or
obligatory for any purpose until the certificate of authentication substantially
in the form hereto is duly executed by the Authenticating Agent by the manual
signature of an authorized signatory of such Authentication Agent, and such
certificate upon any Note shall be conclusive evidence, and the only evidence,
that such Note has been duly authenticated and delivered hereunder and is
entitled to the benefits of these Terms and Conditions.

     In case the Company, pursuant to Conditions 3(B) and 3(C), shall be
consolidated or merged with or into any other Person or shall convey, transfer,
lease or otherwise dispose of its Properties and assets substantially as an
entirety to any Person, and the successor Person resulting from such
consolidation, or surviving such merger, or into which the Company shall have
been merged, or the Person which shall have received a conveyance, transfer,
lease or other disposition as aforesaid, shall have entered into an amendment
hereto, any of the Notes authenticated or delivered prior to such consolidation,
merger, conveyance, transfer, lease or other disposition may, from time to time,
at the request of the successor Person, be exchanged for other Notes executed in
the name of the successor Person with such changes in phraseology and form as
may be appropriate, but otherwise in substance of like tenor as the Notes
surrendered for such exchange and of like principal amount; and the
Authenticating Agent, upon Company order of the successor Person, shall
authenticate and deliver Notes as specified in such request for the purpose of
such exchange.

     (D)  If the Common Depository referred to in Condition 1(F) notifies the
Company that it is unwilling or unable to continue as Common Depository for this
Global Note, the Company shall use its best efforts to identify and appoint a
successor depository within 90 days of such notice. Pending the preparation of
definitive Notes, if required herein, the Company may execute, and upon Company
order the Authenticating Agent shall authenticate and deliver, temporary Notes
which are printed, lithographed, typewritten, mimeographed or otherwise produced
and in the Authorized Denomination, substantially of the tenor of the definitive
Notes in lieu of which they are issued and with such appropriate insertions,
omissions, substitutions and other variations as the officers executing such
Notes may determine, as conclusively evidenced by their execution of such Notes.

     If temporary Notes are required to be issued pursuant to these Conditions,
the Company will cause definitive Notes to be prepared thereafter without
unreasonable delay. After the preparation of definitive Notes, the temporary
Notes shall be exchangeable for definitive Notes upon surrender of the temporary
Notes at the office or agency of the Company designated for such purpose without
charge to the Noteholder. Upon surrender for cancellation of any one or more
temporary Notes, the Company shall execute and the Authenticating Agent shall
authenticate and deliver in exchange therefor a like principal amount of
definitive Notes of the Authorized Denomination or multiples thereof. Until so
exchanged, the temporary Notes shall in all respects be entitled to the same
benefits under these Terms and Conditions as the definitive Notes.

     (E)  Upon surrender for exchange of any Note at the office or agency of the
Company designated pursuant to these Conditions, the Company shall execute, and
the Authenticating Agent shall authenticate and deliver, in the name of the
designated transferee or transferees, one or more new Notes of the Authorized
Denomination or denominations of a like aggregate principal amount.

     Furthermore, any Holder of this Global Note, by acceptance of this Global
Note, agrees that transfers of beneficial interest in such Global Note may be
effected only through a book-entry system maintained by the Holder of the Global
Note (or its agent), and that ownership of a beneficial interest in this Global
Note shall be required to be reflected by way of book entry.

     All Notes issued upon any exchange of Notes shall be the valid obligations
of the Company, evidencing the same debt, and entitled to the same benefits
hereunder, as the Notes surrendered upon such exchange.

     Every Note presented or surrendered for exchange shall (if so required by
the Company) be duly endorsed, or be accompanied by a written instrument of
transfer, in form satisfactory to the Company, duly executed by the Noteholder
thereof or such Noteholder's attorney duly authorized in writing.

                                                                               5

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     Except as otherwise provided herein, no service charge shall be made for
any exchange, conversion or redemption of Notes, but the Company may require
payment of a sum sufficient to cover any tax or other governmental charge that
may be imposed in connection with any exchange of Notes.

     The Company shall not be required (i) to issue or exchange any Note during
a period beginning at the opening of business 15 days before the selection of
Notes to be redeemed hereunder and ending at the close of business on the day of
such mailing of the relevant notice of redemption, (ii) to exchange any Note so
selected for redemption in whole or in part, except the unredeemed portion of
any Note being redeemed in part, or (iii) to register the transfer of or
exchange of any Note during a period beginning five days before the date of
Maturity and ending on such date of Maturity.

     (F)  (1)  This Global Note shall be delivered to the Common Depository.
Members of, or participants in, Euroclear and Clearstream ("Agent Members")
shall have no direct rights hereunder with respect to any Global Note held on
their behalf by the Common Depository, or under such Global Note. The Common
Depository may be treated by the Company, and any agent of the Company, as the
absolute owner of such Global Note for all purposes whatsoever. Notwithstanding
the foregoing, nothing herein shall prevent the Company or any agent of the
Company from giving effect to any written certification, proxy or other
authorization furnished by the Common Depository or shall impair, as between the
Common Depository and the Agent Members, the operation of customary practices
governing the exercise of the rights of a Noteholder.

          (2)  Transfers of the Global Note shall be limited to transfers of the
Global Note in whole, but not in part, to the Common Depository, its successors
or their respective nominees. Interests of beneficial owners in the Global Note
may be transferred in accordance with the rules and procedures of the Common
Depository, Euroclear, Clearstream, and the provisions hereof. Definitive Notes
in bearer form shall be transferred to all beneficial holders in exchange for
their beneficial interests in the Global Note in accordance with the Common
Depository's procedures only if the Common Depository notifies the Company that
it is unwilling or unable to continue as Common Depository for the Global Note
and a successor depository is not appointed by the Company within 90 days of
such notice, or an Event of Default has occurred and is continuing and the
Company has received a request from any owner of a beneficial interest in the
Global Note for such a transfer or the Common Depository.

          (3)  In connection with any transfer of beneficial interests in this
Global Note to beneficial owners pursuant to subsection (2) of this Condition,
the Common Depository shall reflect on its books and records the date and a
decrease in the Principal Amount of this Global Note in an amount equal to the
principal amount of the beneficial interests in this Global Note to be
transferred, and the Company shall execute, and the Authenticating Agent shall
authenticate and deliver, one or more definitive Notes in bearer form of like
tenor and amount.

          (4)  In connection with the transfer of the beneficial interests in
the entire Global Note to beneficial owners pursuant to subsection (2) of this
Condition, this Global Note shall be deemed to be surrendered to the Conversion
and Paying Agent for cancellation, and the Company shall execute, and the
Authenticating Agent shall authenticate and deliver, to each beneficial owner
identified by the Common Depository, in exchange for its beneficial interest in
this Global Note, an equal aggregate principal amount of definitive Notes in
bearer form.

          (5)  Any definitive Note in bearer form delivered in exchange for an
interest in this Global Note pursuant to subsection (2) or subsection (3) of
this Condition shall bear the applicable legend regarding transfer restrictions
applicable to the bearer Note as counsel to the Company shall advise the
Company.

          (6)  The Holder of this Global Note may grant proxies and otherwise
authorize any person, including Agent Members and persons that may hold
interests through Agent Members, to take any action which a Noteholder is
entitled to take under these Terms and Conditions.

          (7)  Any definitive Note in bearer form delivered in exchange for an
interest in this Global Note pursuant to subsection (2) or (3) of this Condition
will prior to delivery to the Noteholder have all matured Coupons as of such
delivery date, which are attached to such bearer Note, cancelled and voided by
the Authenticating Agent.

                                                                               6

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          (8)  Nothing contained herein shall be deemed to authorize any
transfers (by book-entry or otherwise) of this Global Note otherwise than in
accordance with the Securities Act. Unless otherwise required by applicable law,
neither the Company nor the Common Depository shall recognize or give effect to
any attempt to transfer (by book entry or otherwise) or convert any Note or any
interest therein in violation of the Securities Act.

     (G)  The Noteholders by acceptance of the Notes hereby covenant and agree
that neither the Notes nor the Conversion Shares will be offered, sold,
transferred, pledged, converted or otherwise disposed of unless the Notes and/
or the Conversion Shares have been registered under the Securities Act or any
applicable state securities or blue sky laws or exemptions from the registration
requirements of such laws are available.

     (H)  If (i) any mutilated Note or Coupon is surrendered to the
Authenticating Agent, or (ii) the Company and the Authentication Agent receive
evidence to their satisfaction of the destruction, loss or theft of any Note or
Coupon, and there is delivered to the Company and the Authenticating Agent such
security and/or indemnity as may be required by them to save each of them
harmless, then, in the absence of notice to the Company or the Authenticating
Agent that such Note or Coupon has been acquired by a bona fide purchaser, the
Company shall execute and upon Company order the Authenticating Agent shall
authenticate and deliver, in exchange for any such mutilated Note or Coupon or
in lieu of any such destroyed, lost or stolen Note or Coupon, a new Note or
Coupon of like tenor and principal amount, bearing a number not
contemporaneously Outstanding.

     In case any such mutilated, destroyed, lost or stolen Note or Coupon has
become or is about to become due and payable, the Company in its discretion may,
instead of issuing a new Note or Coupon, pay such Note or Coupon, as the case
may be.

     Upon the issuance of any new Note or Coupon under this Section, the Company
may require the payment of a sum sufficient to cover any tax or other
governmental charge that may be imposed in relation thereto and any other
expenses (including the fees and expenses of the Authenticating Agent) connected
therewith.

     Every new Note or Coupon issued pursuant to this Section in lieu of any
destroyed, lost or stolen Note or Coupon shall constitute an original additional
contractual obligation of the Company, whether or not the destroyed, lost or
stolen Note or Coupon shall be at any time enforceable by anyone, and shall be
entitled to all benefits hereunder equally and proportionately with any and all
other Notes or Coupons duly issued hereunder.

     The provisions of this Condition are exclusive and shall preclude (to the
extent lawful) all other rights and remedies with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Note or Coupon.

     Any new Note issued under this Condition 1(H) in lieu of any destroyed,
lost or stolen Note shall be issued by the Authenticating Agent with all matured
Coupons as of such date of issuance cancelled or voided.

2.   Status

     The Notes and any Coupons are direct, unconditional and unsecured
obligations of the Company and will rank pari passu, without any preference
among themselves. The Notes and any Coupons will rank senior to all Subordinated
Obligations of the Company, present and future, but, in the event of bankruptcy
or insolvency of the Company, only to the extent permitted by the applicable
laws relating to creditors' rights. The Notes will not be secured by any assets
or property of the Company. The Notes and any Coupons will rank pari passu with
all other present and future Indebtedness of the Company (including the
Company's 5.0% Senior Convertible Notes due 2003) other than Subordinated
Obligations. The Notes will rank senior to all existing and future Subordinated
Obligations.

                                                                               7

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3.   Covenants

     (A)  The Company will do or cause to be done all things necessary to
preserve and keep in full force and effect its corporate existence, rights
(charter and statutory) and franchises of the Company; provided, however, that
the Company shall not be required to preserve any such right or franchise if the
Board of Directors shall determine that the preservation thereof is no longer in
the best interests of the Company and the conduct of its business, and that the
loss thereof is not disadvantageous in any material respect to the Noteholders;
and provided, further, that nothing contained in this Condition 3(A) shall
prohibit any transaction permitted by Condition 3(B) or Condition 3(C) herein.

     (B)  The Company will not merge or consolidate with or sell, convey,
transfer or lease or otherwise dispose of all, or substantially all of its
Properties and assets substantially as an entirety to any Person, unless: (a)
either (i) the Company shall be the surviving Person or (ii) the Person (if
other than the Company) formed by such consolidation or into which the Company
is merged or the Person which acquired by conveyance or transfer, or which
leases, the Properties and assets of the Company substantially as an entirety
(1) shall be a Person organized and validly existing under the laws of the
United States of America, any state thereof or the District of Columbia and (2)
shall expressly assume, by a written instrument, the Company's obligation for
the due and punctual payment of the principal of and interest on all the Notes
and the performance and observance of every Term and Condition contained herein
and in the Agency Agreement.

     (C)  Upon any consolidation of the Company with or merger of the Company
with or into any other Person or any conveyance, transfer or lease of the
Properties and assets of the Company substantially as an entirety to any person,
the successor Person formed by such consolidation or into which the Company is
merged or to which such conveyance, transfer or lease is made shall succeed to,
and be substituted for, and may exercise every right and power of, the Company
under the Terms and Conditions contained herein with the same effect as if such
successor Person had been named as the Company herein, and in the event of any
such conveyance or transfer, the Company, except in the case of a lease, shall
be discharged of all obligations and covenants under the Notes and may be
dissolved and liquidated.

     (D)  The Company will maintain in at least one European city an office or
agency where Notes may be presented or surrendered for payment, where Notes may
be surrendered for conversion or exchange and where notices and demands to or
upon the Company in respect of the Notes may be served. The corporate trust
office of the Paying Agent at One Canada Square, 48/th/ Floor, London, E14 5AL,
England shall be such office or agency of the Company, unless the Company shall
designate and maintain some other offices or agencies for one or more of such
purposes pursuant to the terms of the Agency Agreement. The Company will give
prompt written notice to the Noteholders of any change in the location of any
such offices or agencies.

     The Company may also from time to time designate one or more other offices
or agencies (in or outside of Europe) where the Notes may be presented or
surrendered for any or all such purposes and may from time to time rescind any
such designation; provided, that no such designation or rescission shall in any
manner relieve the Company of its obligation to maintain an office or agency in
Europe for such purposes. The Company will give prompt written notice to the
Noteholders of any such designation or rescission and any change in the location
of any such other office or agency.

     (E)  The Company will pay or discharge or cause to be paid or discharged,
before the same shall become delinquent, (a) all taxes, assessments and
governmental charges levied or imposed upon the Company or upon the income,
profits or Property of the Company and (b) all lawful claims for labour,
materials and supplies which, if unpaid, might by law become a Lien upon the
Property of the Company; provided, however, that the Company shall not be
required to pay or discharge or cause to be paid or discharged any such tax,
assessment, charge or claim whose amount, applicability or validity is being
contested in good faith by appropriate proceedings.

     (F)  The Company will not amend its Certificate of Incorporation or Bylaws
except as required by law, except in respect to such amendments that the Board
of Directors reasonably determines do not materially adversely

                                                                               8

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affect the rights of the Noteholder, or except to the extent that such amendment
would not have a material adverse effect on (a) the ability of the Company to
perform its obligations under the Notes or (b) the rights of the Noteholders,
except that neither (i) increases in the number of Shares and issuance thereof
with related securities, nor (ii) designations of Preferred Stock of the
Company, modifications of the terms of such designations and issuance thereof
with related securities, nor (iii) modification or expansion of the indemnity
provisions provided by the Company to its directors and officers, nor (iv)
change of the Company's registered agent shall be deemed an amendment hereunder.

     (G)  To the extent permitted by law, the Company will provide to the Paying
Agent or to any Noteholder such statements, certificates or other documentation
concerning the organization or operations of the Company as may be reasonably
necessary to establish any exceptions or exemptions from United States federal
income tax withholding and reporting requirements.

     (H)  The Company shall file a registration statement on Form S-3 (or such
other form as the Company may determine is appropriate or required under the
rules of the Commission), within ninety (90) days following the Issue Date in
respect of all Shares that may be issuable at any time upon the conversion of
the Notes. If the Notes are not Freely Tradeable, and an event occurs under
condition 6(C) hereof which causes the Company to issue additional Conversion
Shares as to which Rule 416 of Regulation C under the Securities Act does not
apply, the Company shall file a registration statement with respect to such
shares on Form S-3 (or other form as the Company may determine is appropriate or
required under the Commission) within ninety (90) days following such event. The
Company shall use its best efforts to cause the Commission to declare such
registration statement(s) (and any necessary amendments thereto) effective. The
Company shall also use its best efforts to maintain the effectiveness of such
registration statement(s), and to refile such a registration statement from time
to time in the event its effectiveness lapses, until all such Shares that either
are issued or that may be issued are Freely Tradable in the United States.

     While any Conversion Right remains exercisable, the Company will use its
best efforts to list and maintain a listing of all Shares issued upon conversion
or redemption of the Note on a Stock Exchange. In the event a Stock Exchange
requires stockholder approval in order to complete the listing of the Shares to
be so issued upon conversion or redemption of the Notes, then the Company will
use its best efforts to obtain such stockholder approval at the earliest
possible stockholder meeting. In this event, the conversion or redemption in
Shares will occur only if and when stockholder approval has been obtained. If
the Company is unable to obtain or maintain such listing of Shares, it will
forthwith give not less than 30 calendar days notice to the Noteholder of the
listing, de-listing or quotation or lack of quotation of the Shares (as a class)
by any such Stock Exchange.

     (I)  If the Company shall at any time act as its own Paying Agent, it will,
on or before each due date of the principal of or interest on any of the Notes,
segregate and hold in trust for the benefit of the Persons entitled thereto a
sum sufficient to pay the principal or interest so becoming due until such sums
shall be paid to such Persons or otherwise disposed of as herein provided and
will promptly notify the Paying Agent of its action or failure so to act.

     Whenever the Company shall have one or more Paying Agents for the Notes, it
will, on or before 3:00 p.m. (London time) on the Business Day immediately
preceding each due date of the principal of or interest on any Notes, deposit
with a Paying Agent a sum sufficient to pay the principal or interest so
becoming due, such sum to be held in trust for the benefit of the Persons
entitled to such principal or interest.

     Pursuant to the terms of the Agency Agreement, the Paying Agent shall agree
with the Company, subject to the provisions of this Condition, that such Paying
Agent will:

          (1)  hold all sums held by it for the payment of the principal of or
interest on Notes in trust for the benefit of the Persons entitled thereto until
such sums shall be paid to such Persons or otherwise disposed of as herein
provided; and

                                                                               9

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          (2)  notify the Company by facsimile transmission or by telex if the
Paying Agent has not, by the due date for the payment of any principal and/or
interest in respect of the Notes or Coupons received unconditionally the full
amount of such principal and interest due.

     Any money deposited with the Paying Agent, or then held by the Company, in
trust for the payment of the principal of or interest on any Note and remaining
unclaimed for two years after such principal or interest has become due and
payable shall be paid to the Company on the Company order, or (if then held by
the Company) shall be discharged from such trust; and the Holder of such Note
shall thereafter, as an unsecured general creditor, look only to the Company for
payment thereof, and all liability of the such Paying Agent with respect to such
trust money, and all liability of the Company as trustee thereof, shall
thereupon cease; provided, however, that the Paying Agent, before being required
to make any such repayment, may at the expense of the Company cause to be
published once, in the Authorized Newspapers, notice that such money remains
unclaimed and that, after a date specified therein, which shall not be less than
30 days from the date of such publication, any unclaimed balance of such money
then remaining will be repaid to the Company.

4.   Interest

     The Notes bear interest from (and including) May 23, 2003 (the "Issue
Date"), at the rate of seven percent (7%) per annum, payable semi-annually in
arrears on September 30 and March 31 in each year (each an "Interest Payment
Date"), the first such payment to be made on September 30, 2003, in respect of
the period from (and including) the Issue Date to (but excluding) September 30,
2003, and the interest payable will equal U.S. $350.00 per U.S. $10,000
principal amount of the Notes for each complete semi-annual interest period.

     Each Note will cease to bear interest (i) from its due date for redemption
unless the Company shall default in the payment of the Redemption Price, in
which event interest shall continue to accrue as provided in herein, or (ii)
where the Conversion Right shall have been voluntarily exercised by the
Noteholder, from the Conversion Date, or (iii) in the case of a Mandatory
Conversion, from the Mandatory Conversion Date.

     Interest is calculated on the basis of a 360 day year consisting of 12
months of 30 days each and, in the case of an incomplete month, the number of
days elapsed.

5.   Payments

     For so long as the Notes are represented by a Global Note, beneficial
interests in this Global Note will be shown on, and transfers thereof will be
effected only through, records maintained by, and in accordance with the rules
and procedures of, Euroclear or Clearstream, as the case may be.

     While the Notes are registered in the name of the Common Depository,
Payments of interest on each Note shall be paid by the Agent on each Interest
Payment Date, commencing September 30, 2003, to the Holder of such Note as shown
on the Note Register at the close of business on the applicable Record Date,
such payment to be made in accordance with the rules and procedures of such
Common Depository and in accordance with the rules and procedures of Euroclear
or Clearstream, as the case may be.

     In case of certificated Notes, payments of principal in respect of each
Note and any net proceeds payable under Condition 6(D) will only be made,
against presentation and surrender (or, in the case of part payment only,
endorsement) of the relevant Note at the specified office of the Paying Agent.
Payments of interest due on the Notes on an Interest Payment Date will be made
against presentation and surrender (or, in the case of part payment only,
endorsement) of the relevant Coupons at the specified office of the Paying
Agent. All payments of principal and interest shall be made in U.S. dollars.
Each such payment and any payment of the net proceeds of the sale of Shares
pursuant to Condition 6(D) will be made at the specified office of any Paying
Agent, at the option of the Holder, by U.S. dollar cheque mailed to an address,
or delivered in accordance with the Holder's instructions, or by transfer to a
U.S. dollar account maintained by the Holder in accordance with the holder's
instructions, subject in all cases to any applicable fiscal or other laws and
regulations, but without prejudice to the provisions of Condition 9.

                                                                              10

<PAGE>

     If, at any time, in the opinion of the Company or of the Paying Agent,
payments in U.S. dollars cannot be so made, payments will be made in U.S.
dollars in such other manner as may be approved by the Company and the Paying
Agent and notice of the alternative manner of payment will be given to the
Noteholders in accordance with Condition 15.

     Each Note must be presented for redemption together with all unmatured
Coupons relating to such Note, failing which the full amount of any missing
unmatured Coupon (or, in the case of payment not being made in full, that
proportion of the full amount of the missing unmatured Coupons which the amount
so paid bears to the total amount due) will be deducted from the amount due for
payment. Each amount so deducted will be paid in the manner mentioned above
against presentation and surrender (or, in the case of part payment only,
endorsement) of such missing Coupon at any time before the expiry of six (6)
years after the Relevant Date in respect of the relevant Note (whether or not
such Coupon would otherwise have become void pursuant to Condition 10), or, if
later, five (5) years after the date on which such Coupon would have become due,
but not thereafter.

     All monies paid by the Company to the Paying Agent for the payment of
principal or interest on any Note which remain unclaimed at the end of two (2)
years after the principal on such Note will have become due and payable will be
repaid to the Company and the Holder of such Note or any Coupon appertaining
thereto will thereafter have only the rights of a creditor of the Company as
described in these Terms and Conditions or such rights as may be otherwise
provided by applicable law.

     A Holder shall be entitled to present a Note or Coupon for payment only on
a Presentation Date and shall not be entitled to any further interest or other
payment if a Presentation Date is after the due date.

     When making payments to Noteholders or Couponholders, fractions of one cent
will be rounded down to the nearest whole cent.

     The name of the initial Paying Agent and Conversion Agent and its initial
specified office is set out at the end of these Terms and Conditions. The
Company reserves the right at any time to vary or terminate the appointment of
the Paying Agent or Conversion Agent and to appoint additional or other Paying
Agents or Conversion Agents. Notice of any termination or appointment and of any
changes in specified offices will be given to the Noteholders promptly by the
Company in accordance with Condition 15.

6.   Conversion

     (A)  Optional Conversion by the Noteholders; Conversion Period and Price

          (i)   Noteholders have the right, subject as provided herein and to
any applicable laws and regulations, to require the Company to convert all or
any of their Notes at their principal amount into Shares at any time during the
Conversion Period ("Conversion Right"). The Conversion Period begins after the
earlier to occur of (I) the close of the effective date of a Registration
Statement filed by the Company with the Commission with respect to the Shares or
(II) the date such Shares may be sold pursuant to the exemption from
registration under the Securities Act provided by Rule 144 or other exemption
from registration under the Securities Act, and ends upon the earliest to occur
of (A) the second Business Day prior to the later of March 31, 2007, or the date
on which all principal and interest on the Note is repaid in full, (B) if such
Notes shall have been called for redemption pursuant to Condition 7, the close
of the second Business Day prior to the Redemption Date, or (C) the effective
date of a Mandatory Conversion. Upon conversion, the right of the converting
Noteholder to repayment of the principal amount of the Note to be converted
(and, subject as provided in Condition 6(B)(iv), accrued and unpaid interest
thereon) shall be extinguished and released, and in consideration and in
exchange therefor the Company shall allot and issue Shares credited as paid up
in full as provided in this Condition 6.

          The number of Shares to be issued on conversion of a Note will be
determined by dividing the principal amount of the Note to be converted, plus
accrued and unpaid interest thereon, by the Conversion Price, (as defined below)
in effect on the Conversion Date, with the result being rounded down to the
nearest whole number.

                                                                              11

<PAGE>

          (ii)  A Conversion Right may only be exercised in respect of the
Authorized Denomination or multiples thereof of Notes. If more than one Note is
converted at any one time by the same Holder, the number of Shares to be issued
upon such conversion will be calculated on the basis of the aggregate principal
amount of the Notes to be converted. Fractions of Shares will not be issued on
conversion and no cash adjustments will be made in respect thereof.

          (iii) Except for conversions pursuant to Condition 7(B)(iii), the
price at which Shares will be issued upon the exercise of a Conversion Right
(the "Conversion Price") initially will be U.S. $0.50. The Conversion Price will
be subject to adjustment in accordance with the manner provided in Condition
6(C). The Company shall give notice of any adjustment of the Conversion Price in
accordance with Condition 15 within ten (10) Business Days with effective date
of such adjustment.

          (iv)  Notwithstanding the provisions of paragraph (i) of this
Condition 6(A), if the Company shall default in making payment in full in
respect of any Note which shall have been called for redemption or shall fail to
issue Shares in respect of any Conversion or redemption, then, from the Relevant
Date, interest shall continue to accrue on such Note and the Conversion Right
attaching to such Note will continue to be exercisable (unless already exercised
by the Company pursuant to Condition 6(D)) up to, and including the close of
business (at the place where the Note is deposited in connection with the
exercise of the Conversion Right) on the date upon which the full amount of the
monies payable in respect of such Note has been duly received by the Paying
Agent or, the date of the issuance of the Conversion Shares or redemption
Shares.

     (B)  Procedure for Conversion

          (i)   To exercise the Conversion Right attaching to any Note, the
Holder thereof must complete, execute and deposit at his own expense during
normal business hours at the specified office of the Conversion Agent, a notice
of conversion (a "Conversion Notice") in the form for the time being currently
obtainable from the specified office of such Conversion Agent, together with the
relevant Note and any amount to be paid by the Noteholder pursuant to this
Condition 6(B)(i). The form of Conversion Notice is attached hereto as
Exhibit A.

                The Conversion Date must fall at a time when the Conversion
Right attaching to that Note is expressed in these Conditions to be exercisable
and will be deemed to be the date of the surrender of the Note and delivery of
such Conversion Notice and, if applicable, any payment to be made or indemnity
given under these Conditions in connection with the exercise of such Conversion
Right.

                A Noteholder delivering a Note for conversion must pay any taxes
and capital, stamp, issue and registration duties arising on conversion (other
than any taxes or capital, or stamp duties payable in the U.S. or required by
any Stock Exchange, by the Company in respect of the allotment and issue of
Shares and listing of the Shares on conversion). A Conversion Notice delivered
shall be irrevocable.

          (ii)  As soon as practicable, and in any event not later than fourteen
(14) calendar days after the Conversion Date, the Company will in the case of
Notes converted on exercise of the Conversion Right or a Note being converted in
accordance with Condition 6(D) and in respect of which a Conversion Notice or
has been delivered and the relevant Note, together with all Outstanding Coupons,
and amounts payable by the relevant Noteholder deposited as permitted by
sub-paragraph (i) above, cause the person or persons designated for the purpose
in the Conversion Notice to be registered as holder(s) of the relevant number of
Shares and will make a certificate or certificates for the relevant Shares
available for collection at the Company's principal office in Houston, Texas or
at the Company's transfer agent in New York, New York, or, if so requested in
the relevant Conversion Notice, will deliver such certificate or certificates to
the person and at the place specified in the Conversion Notice, at the risk of
the Noteholder, together with any other securities, property or cash required to
be delivered upon conversion and such assignments and other documents (if any)
as may be required by law to effect the transfer thereof.

                                                                              12

<PAGE>

          (iii) The person or persons specified for that purpose will be deemed
for all purposes to be the Holder of record of the number of Shares issuable
upon conversion with effect from the Conversion Date or Mandatory Conversion
Date, as the case may be. The Shares issued upon conversion of the Notes will in
all respects rank pari passu with the issued and outstanding Shares of Common
Stock in issue on the relevant Conversion Date or Mandatory Conversion Date, as
the case may be, except for any right excluded by mandatory provisions of
applicable law. A Holder of Shares issued on conversion of Notes shall not be
entitled to any rights for any record date which precedes the relevant
Conversion Date or Mandatory Conversion Date, as the case may be.

          (iv)  If any notice requiring the redemption of any Notes is given
pursuant to Condition 7(B) on or after the fifteenth (15/th/) calendar day prior
to the record date in respect of any dividend payable in respect of the Shares
and such notice specifies a date for redemption falling on or prior to the next
following Interest Payment Date, interest shall (subject as hereinafter
provided) accrue on Notes which shall have been delivered for conversion on or
after such record date from the preceding Interest Payment Date; provided, that
the relevant Noteholder's entitlement to interest on any Note, in the event that
the Shares allotted on conversion thereof shall carry an entitlement to receive
such dividend, shall be limited to the amount by which the interest such
Noteholder would have received had no conversion taken place exceeds the amount
of the dividend received on such Shares. Any such interest shall be paid by the
Company not later than fourteen (14) calendar days after the relevant Conversion
Date by U.S. dollar cheque drawn on, or by transfer to U.S. dollar account
maintained by the payee with, a bank outside the United States in accordance
with instructions given by the relevant Noteholder.

     (C)  Adjustment of Conversion Price

          (i)  Dividends or Distributions of Common Stock. In case the Company
shall pay or make a dividend or other distribution on its Common Stock
exclusively in Common Stock or shall pay or make a dividend or other
distribution on any other class of capital stock of the Company which dividend
or distribution includes Common Stock, the Conversion Price in effect at the
opening of business on the day next following the date fixed for the
determination of stockholders entitled to receive such dividend or other
distribution shall be reduced by multiplying such Conversion Price by a fraction
of which the numerator shall be the number of shares of Common Stock outstanding
at the close of business on the date fixed for such determination and the
denominator shall be the sum of such number of shares and the total number of
shares constituting such dividend or other distribution, such reduction to
become effective immediately after the opening of business on the day next
following the date fixed for such determination. For the purposes of this
Condition 6(C)(i), the number of shares of Common Stock at any time outstanding
shall not include shares held in the treasury of the Company. For the avoidance
of doubt, this Condition does not apply to dividends or other distributions in
shares of the Common Stock pursuant to the terms of the securities to which such
dividend or other distribution may be made.

          (ii)   Dividends or Distributions of Rights, Warrants or Options to
Purchase Common Stock. In case the Company shall pay or make a dividend or other
distribution on its Common Stock consisting exclusively of, or shall otherwise
issue to all holders of its Common Stock, rights, warrants or options entitling
the holders thereof to subscribe for or purchase shares of Common Stock at a
price per share less than the Market Price per share (determined as further
defined in certain circumstances in paragraph (vii) of this Condition 6(C)) of
the Common Stock on the date fixed for the determination of stockholders
entitled to receive such rights, warrants or options, the Conversion Price in
effect at the opening of business on the day following the date fixed for such
determination shall be reduced by multiplying such Conversion Price by a
fraction of which the numerator shall be the number of shares of Common Stock
outstanding at the close of business on the date fixed for such determination
plus the number of shares of Common Stock which the aggregate of the offering
price of the total number of shares of Common Stock so offered for subscription
or purchase would purchase at such Market Price and the denominator shall be the
number of shares of Common Stock outstanding at the close of business on the
date fixed for such determination plus the number of shares of Common Stock so
offered for subscription or purchase, outstanding at the close of business on
the date fixed for such reduction to become effective immediately after the
opening of business on the day following the date fixed for such determination.
For the purposes of this paragraph (ii), the number of shares of Common Stock at
any time outstanding shall not include shares held in the treasury of the
Company. The Company shall not issue any rights, warrants or options in respect
of shares of Common Stock held in the treasury of the Company.

                                                                              13

<PAGE>

          (iii)  Dividends or Distributions in Cash. In case the Company shall,
by dividend or otherwise, make a distribution to all holders of its Common Stock
exclusively in cash in an aggregate amount that, together with (1) the aggregate
amount of any other distributions to all holders of its Common Stock made
exclusively in cash within the 12 months preceding the date of payment of such
distribution and in respect of which no Conversion Price adjustment pursuant to
this 6(C)(iii) has been made and (2) the aggregate of any cash plus the fair
market value (as determined in good faith by the Board of Directors, whose
determination shall be conclusive and described in a resolution of the Company's
Board of Directors), as of the expiration of the tender or exchange offer
referred to below, of consideration payable in respect of any tender or exchange
offer by the Company or a Subsidiary for all or any portion of the Common Stock
concluded within the 12 months preceding the date of payment of such
distribution and in respect of which no Conversion Price adjustment pursuant to
paragraph (vi) of this Condition 6(C) has been made, exceeds five percent (5%)
of the product of the Market Price per share(determined as further defined in
certain circumstances in paragraph (vii) of this Condition 6(C)) of the Common
Stock on the date fixed for stockholders entitled to receive such distribution
times the number of shares of Common Stock outstanding on such date, the
Conversion Price shall be reduced so that the same shall equal the price
determined by multiplying the Conversion Price in effect immediately prior to
the effectiveness of the Conversion Price reduction contemplated by this
paragraph (iii) by a fraction of which the numerator shall be the Market Price
per share (determined as provided Section Condition 6(C)(vi)) of the Common
Stock on the date of such effectiveness less the amount of cash so distributed
applicable to one share of Common Stock and the denominator shall be such Market
Price per share of the Common Stock, such reduction to become effective
immediately prior to the opening of business on the day following the date fixed
for the payment of such distribution.

          (iv)   All Other Distributions or Dividends. Subject to the last
sentence of this paragraph (iv), in case the Company shall, by dividend or
otherwise, distribute to all holders of its Common Stock evidences of its
indebtedness, shares of any class of capital stock, securities, cash or Property
(excluding any rights, warrants or options referred to in Condition 6(C)(ii),
any dividend or distribution paid exclusively in cash and any dividend or
distribution referred to in Condition 6(C)(i), the Conversion Price shall be
reduced so that the same shall equal the price determined by multiplying the
Conversion Price in effect immediately prior to the effectiveness of the
Conversion Price reduction contemplated by this paragraph (iv) by a fraction of
which the numerator shall be the Market Price per share (determined as further
defined in certain circumstances in paragraph (vii) of this Condition 6(C)) of
the Common Stock on the date of such effectiveness less the fair market value
(as determined in good faith by the Board of Directors, whose determination
shall be conclusive and described in a resolution of the Company's Board of
Directors and shall, in the case of securities being distributed for which prior
thereto there is an actual or when issued trading market, be no less than the
value determined by reference to the average of the Market Price over the period
specified in the succeeding sentence), on the date of such effectiveness, of the
portion of the evidences of indebtedness, shares of capital stock, securities,
cash and Property so distributed applicable to one share of Common Stock and the
denominator shall be such Market Price per share of the Common Stock, such
reduction to become effective immediately prior to the opening of business on
the day next following the date fixed for the payment of such distribution (such
date to being referred to as the "Reference Date"). If the Board of Directors
determines the fair market value of any distribution for purposes of this
paragraph (iv) by reference to the actual or when issued trading market for any
securities comprising such distribution, it must in doing so consider the prices
in such market over the same period used in computing the Market Price per share
pursuant to paragraph (vi) of this Condition 6(C). For purposes of this
paragraph (iv), any dividend or distribution that includes shares of Common
Stock or rights, warrants or options to subscribe for or purchase shares of
Common Stock shall be deemed instead to be (1) a dividend or distribution of the
evidences of indebtedness, cash, Property, shares of capital stock or securities
other than such shares of Common Stock or such rights, warrants or options
(making any Conversion Price reduction required by this paragraph (iv))
immediately followed by (2) a dividend or distribution of such shares of Common
Stock or such rights, warrants or options (making any further Conversion Price
reduction required by Condition 6(C)(i) or (ii)), except (A) the Reference Date
of such dividend or distribution as defined in this Condition 6(C)(iv) shall be
substituted as "the date fixed for the determination of stockholders entitled to
receive such dividend or other distribution," "the date fixed for the
determination of stockholders entitled to receive such rights, warrants or
options," and "the date fixed for such determination" within the meaning of
Condition 6(C)(i) and Condition 6(C)(ii) and (2) any shares of Common Stock
included in such dividend or distribution shall not be deemed "outstanding at
the close of business on the date fixed for such determination" within the
meaning of Condition 6(C)(i)).

                                                                              14

<PAGE>

          (v)    Subdivision of Common Stock. In case outstanding shares of
Common Stock shall be subdivided into a greater number of shares of Common
Stock, the Conversion Price in effect at the opening of business on the day
following the day upon which such subdivision becomes effective shall be
proportionately reduced, and, conversely, in case outstanding shares of Common
Stock shall each be combined into a smaller number of shares of Common Stock,
the Conversion Price in effect at the opening of business on the day following
the day upon which such combination becomes effective shall be proportionately
increased, such reduction or increase, as the case may be, to become effective
immediately after the opening of business on the day following the day upon
which such subdivision or combination becomes effective.

          (vi)   Tender or Exchange Offer for Common Stock. In case a tender or
exchange offer made by the Company or any Subsidiary for all or any portion of
the Common Stock shall expire and such tender or exchange offer shall involve an
aggregate consideration having a fair market value (as determined in good faith
by the Board of Directors, whose determination shall be conclusive and described
in a resolution of the Company's Board of Directors) at the last time (the
"Expiration Time") tenders or exchanges may be made pursuant to such tender or
exchange offer (as it may be amended) that, together with (A) the aggregate of
the cash plus the fair market value (as determined in good faith by the Board of
Directors, whose determination shall be conclusive and described in a resolution
of the Company's Board of Directors), as of the expiration of the other tender
or exchange offer referred to below, of consideration payable in respect of any
other tender or exchange offer by the Company or a Subsidiary for all or any
portion of the Common Stock concluded within the preceding 12 months and in
respect of which no Conversion Price adjustment pursuant to this paragraph (vi)
has been made and (B) the aggregate amount of any distributions to all holders
of the Common Stock made exclusively in cash within the preceding 12 months and
in respect of which no Conversion Price adjustment pursuant to Condition 6(C)(v)
has been made, exceeds five percent (5%) of the product of the Market Price per
share (determined as provided in Condition 6(C)(vii)) of the Common Stock on the
Expiration Time times the number of shares of Common Stock outstanding
(including any tendered shares) on the Expiration Time, the Conversion Price
shall be reduced (but not increased) so that the same shall equal the price
determined by multiplying the Conversion Price in effect immediately prior to
the Expiration Time by a fraction of which the numerator shall be (1) the
product of the Market Price per share (determined as provided in Condition
6(C)(vii)) of the Common Stock at the Expiration Time times the number of shares
of Common Stock outstanding (including any tendered or exchanged shares) at the
Expiration Time minus (2) the fair market value (determined as aforesaid) of the
aggregate consideration payable to stockholders based on the acceptance (up to
any maximum specified in the terms of the tender or exchange offer) of all
shares validly tendered or exchanged and not withdrawn as of the Expiration Time
(the shares deemed so accepted, up to any such maximum, being referred to as the
"Purchased Shares") and the denominator shall be the product of (1) such Market
Price per share at the Expiration Time times (2) such number of outstanding
shares at the Expiration Time less the number of Purchased Shares, such
reduction to become effective immediately prior to the opening of business on
the day following the Expiration Time.

          (vii)  Determination of Market Price. For the purpose of any
computation of the Market Price under this paragraph (vii) and Conditions
6(C)(ii), (iv) and (v) when certain circumstances described therein have
occurred within ten (10) Business Days of the event giving rise to the
adjustment in the Conversion Price, (A) if the "ex" date (as hereinafter
defined) for any event (other than the issuance or distribution requiring such
computation) that requires an adjustment to the Conversion Price pursuant to
paragraphs (i), (ii), (iii), (iv), (v) or (vi) above ("Other Event") occurs on
or after the tenth Stock Exchange Business Day prior to the date in question and
prior to the "ex" date for the issuance or distribution requiring such
computation (the "Current Event"), the closing price for each Stock Exchange
Business Day prior to the "ex" date for such Other Event shall be adjusted by
multiplying such closing price by the same fraction by which the Conversion
Price is so required to be adjusted as a result of such Other Event, (B) if the
"ex" date for any Other Event occurs after the "ex" date for the Current Event
and on or prior to the date in question, the closing price for each Stock
Exchange Business Day on and after the "ex" date for such Other Event shall be
adjusted by multiplying such closing price by the reciprocal of the fraction by
which the Conversion Price is so required to be adjusted as a result of such
Other Event, (C) if the "ex" date for any Other Event occurs on the "ex" date
for the Current Event, one of those events shall be deemed for purposes of
clauses (A) and (B) of this proviso to have an "ex" date occurring prior to the
"ex" date for the other event, and (C) if the "ex" date for the Current Event is
on or prior to the date in question, after taking into account any adjustment
required

                                                                              15

<PAGE>

pursuant to clause (B) of this proviso, the closing price for each Stock
Exchange Business Day on or after such "ex" date shall be adjusted by adding
thereto the amount of any cash and the fair market value on the date in question
(as determined in good faith by the Board of Directors in a manner consistent
with any determination of such value for purposes of Condition 6(C)(iii) or
Condition 6(C)(iv) or (C), whose determination shall be conclusive and described
in a resolution of the Company's Board of Directors) of the portion of the
rights, warrants, options, evidences of indebtedness, shares of capital stock,
securities, cash or Property being distributed applicable to one share of Common
Stock. For the purpose of any computation under Condition 6(C)(vi), the Market
Price per share of Common Stock on any date in question shall be deemed to be
the Market Price on the date selected by the Company commencing on or after the
latest (the "Commencement Date") of (A) the date 20 Stock Exchange Business Days
before the date in question, (B) the date of commencement of the tender or
exchange offer requiring such computation, and (C) the date of the last
amendment, if any, of such tender or exchange offer involving a change in the
maximum number of shares for which tenders are sought or a change in the
consideration offered, and ending not later than the date of the Expiration Time
of such tender or exchange offer (or, if such Expiration Time occurs before the
close of trading on a Stock Exchange Business Day, not later than the Stock
Exchange Business Day immediately preceding the date of such Expiration Time);
provided, however, that if the "ex" date for any Other Event (other than the
tender or exchange offer requiring such computation) occurs on or after the
Commencement Date and on or prior to the date of the Expiration Time for the
tender or exchange offer requiring such computation, the closing price for each
Stock Exchange Business Day prior to the "ex" date for such Other Event shall be
adjusted by multiplying such closing price by the same fraction by which the
Conversion Price is so required to be adjusted as a result of such other event.
For purposes of this paragraph, the term "ex" date, (A) when used with respect
to any issuance or distribution, means the first date on which the Common Stock
trades regular way on the relevant exchange or in the relevant market from which
the closing price was obtained without the right to receive such issuance or
distribution, (B) when used with respect to any subdivision or combination of
shares of Common Stock, means the first date on which the Common Stock trades
regular way on such exchange, or in such market after the time at which such
subdivision or combination becomes effective, and (C) when used with respect to
any tender or exchange offer means the first date on which the Common Stock
trades regular way on such exchange or in such market after the Expiration Time
of such tender or exchange offer.

          (viii) Further Reductions for Federal Income Tax. The Company may make
such reductions in the Conversion Price, in addition to those required by
Conditions 6(C) (i), (ii), (iii), (iv), (v), and (vi), as it considers to be
advisable in order that any event treated for Federal income tax purposes as a
dividend of stock or stock rights shall not be taxable to the recipients.

          (ix)   Adjustments to be Carried Forward. No adjustment in the
Conversion Price shall be required unless such adjustment would require an
increase or decrease of at least five percent (5%) in the Conversion Price;
provided, however, that any adjustments which by reason of this paragraph (ix)
are not required to be made shall be carried forward and taken into account in
any subsequent adjustment.

          (x)    Notice of Adjustments of Conversion Price

          Whenever the Conversion Price is adjusted as herein provided the
Company shall compute the adjusted Conversion Price in accordance with Section
Condition 6(C) and shall prepare a certificate signed by the chief financial
officer of the Company setting forth the adjusted Conversion Price and showing
in reasonable detail the facts upon which such adjustment is based, and such
certificate shall forthwith be delivered to the Paying Agent and the Conversion
Agent, and the Company shall cause notice thereof to be published in accordance
with Condition 15 at least ten (10) Business Days in advance of the effective
date of such adjustment.

     (D)  Mandatory Conversion

          (i)   Each Noteholder acknowledges and agrees that provided the Shares
into which the Notes would be converted are Freely Tradeable and listed on a
Stock Exchange, the Company may, at its own cost (save those expenses or taxes
referred to in Condition 6(D)(iii)), at any time following ninety days from the
Effective Date, elect to exercise the Conversion Right on behalf of each and
every Noteholder in respect of all of the Notes Outstanding at the Conversion
Price applicable as of the date fixed by the Company for such conversion (the

                                                                              16

<PAGE>

"Mandatory Conversion Date"), provided that the average of the Market Price of
the Shares over the Stock Exchange Business Days in any thirty (30) consecutive
calendar day period following the Effective Date, is equal to or greater than
one hundred twenty-five percent (125%) of the Conversion Price. The Company will
give notice in the manner set out in Condition 15 that the criteria for
Mandatory Conversion under this Condition 6(D) has been met within 30 days of
having met such criteria. The form of Company Conversion Notice is attached
hereto as Exhibit B.

          (ii)  At least 45 calendar days prior to the Mandatory Conversion
Date, the Company shall cause written notice of the Mandatory Conversion Date to
be given to the Paying and Conversion Agent. Not less than 30 and not more than
60 calendar days prior to the Mandatory Conversion Date, the Company shall cause
written notice of the Mandatory Conversion Date to be given to the Paying Agent,
the Conversion Agent and the Noteholders (in accordance with Condition 15).
Following such notice, each of the Noteholders will be required on or before the
Mandatory Conversion Date to deliver or procure delivery of its Notes with all
unmatured Coupons relating to such Notes together with a duly completed
Conversion Notice to the specified office of the Conversion Agent, during its
usual business hours for such purposes and perform together with the Company,
the obligations applicable to it on conversion specified in this Condition 6.
Failure to deliver the Conversion Notice shall not affect the conversion of such
Notes pursuant to the terms of this Condition 6(D).

          (iii) If any Noteholder with respect to whose Notes Mandatory
Conversion (pursuant to this Condition 6) is to take place shall fail to perform
its obligations specified in this Condition 6 or shall have a registered address
in any territory where, in the absence of any registration statement or other
special formalities or legal requirements, the issue, allotment, transfer or
delivery of the Shares arising on Mandatory Conversion in the reasonable opinion
of the Company, is or could be unlawful or impracticable, subject to applicable
law, Company shall make arrangements for the sale of such Shares to a third
party at the best consideration reasonably obtainable by the Company and arrange
for the Paying Agent to pay to such Noteholder the consideration received by it
in respect of such Shares (after any deduction required to reimburse any
reasonable and proper expenses incurred in arranging any such sale or any taxes
payable in connection therewith arising solely as a result of the Noteholder's
failure to perform its obligations under this Condition 6(D)).

          (iv)  From and after the Mandatory Conversion Date and upon compliance
by the Company of its obligations hereunder with respect to such conversion, the
Notes shall cease to constitute Indebtedness of the Company and shall thereafter
be only deemed to represent the right to receive Shares.

     (E)  Notice of Certain Corporate Action

     In case of the occurrence of one or more of the events that are listed
herein, the Company shall cause to be mailed to the Paying Agent and the
Conversion Agent and to be published in the manner provided under Condition 15
hereof within ten (10) Business Days after the date on which notice is sent to
the holders of the Company's Common Stock. Such events are: (i) the Company
shall declare a dividend (or any other distribution) on its Common Stock payable
(1) otherwise than exclusively in cash, or (2) exclusively in cash in an amount
that would require a Conversion Price adjustment pursuant to Condition
6(C)(iii); or (ii) the Company shall authorize the granting to the holders of
its Common Stock of rights, warrants or options to subscribe for or purchase any
shares of capital stock of any class or of any other rights (excluding employee
stock options); or (iii) of any reclassification of the Common Stock of the
Company (other than a subdivision or combination of its outstanding shares of
Common Stock), or of any consolidation or merger to which the Company is a party
and for which approval of any stockholders of the Company is required, or of the
sale or transfer of all or substantially all of the assets of the Company; or
(iv) of the voluntary or involuntary dissolution, liquidation or winding up of
the Company; or (v) the Company or any Subsidiary of the Company shall commence
a tender or exchange offer for all or a portion of the Company's outstanding
shares of Common Stock (or shall amend any such tender or exchange offer); The
Notice shall state (i) the date on which a record is to be taken for the purpose
of such dividend, distribution or granting of rights, warrants or options, or,
if a record is not to be taken, the date as of which the holders of Common Stock
of record to be entitled to such dividend, distribution, rights, warrants or
options are to be determined, or (ii) the date on which such reclassification,
consolidation, merger, sale, transfer, dissolution, liquidation or winding up is
expected to become effective, and the date as of which it is expected that
holders of Common Stock of record shall be entitled to exchange their shares of
Common Stock for securities, cash or other Property deliverable upon such re-

                                                                              17

<PAGE>

classification, consolidation, merger, sale, transfer, dissolution, liquidation
or winding up, or (iii) the date on which such tender offer commenced, the date
on which such tender offer is scheduled to expire unless extended, the
consideration offered and the other material terms thereof (or the material
terms of any amendment thereto).

     (F)  Consolidation, Amalgamation or Merger

     In the event that the Company shall be a party to any transaction,
including without limitation any (i) recapitalization or reclassification of the
Common Stock (other than a change in par value, or from par value to no par
value, or from no par value to par value, or as a result of a subdivision or
combination of the Common Stock), (ii) any consolidation of the Company with, or
merger of the Company into, any other person, any merger of another person into
the Company (other than a merger which does not result in a reclassification,
conversion, exchange or cancellation of all of the outstanding shares of Common
Stock of the Company), (iii) any sale or transfer of all or substantially all of
the assets of the Company, or (iv) any compulsory share exchange pursuant to
which the Common Stock is converted into the right to receive other securities,
cash or other Property, the Company will forthwith notify the Noteholders of
such event in accordance with Condition 15 and, then lawful provision shall be
made as part of the terms of such transaction whereby the Holder of each Note
then Outstanding shall have the right (during the period in which such Note is
convertible) to convert such Note into the class and amount of shares and other
securities and property receivable upon such transaction by a holder of such
number of shares of Common Stock which would have been liable to be issued upon
conversion of such Note immediately prior to the transaction. So far as legally
possible, the Company shall cause the Person formed by such consolidation or
resulting from such merger or which acquired such assets or which acquired the
Company's Shares, as the case may be, to execute and deliver the Paying Agent on
behalf of each of the Noteholders an amendment to these Terms and Conditions as
provided for under Condition 17. Such amendment shall provide for adjustments
which, for events subsequent to the effective date of such amendment, shall be
as nearly equivalent as may be practicable to the adjustments provided for in
this Condition. The above provisions of this Condition 6(F) shall similarly
apply to successive transactions of the foregoing type.

     (G)  Conversion Prohibited Under Certain Circumstances

     The Note shall not be convertible into Conversion Shares as provided in
this Condition 6 nor may it be redeemed for Shares as provided in Condition
7(B)(iii) herein if the Stock Exchange on which the Shares are listed requires
the approval by the stockholders of the Company of the issuance of the Shares
which may be issued upon the exercise of the conversion rights contained in this
Condition 6 or issued pursuant to Condition 7(B)(iii) and the stockholders fail
to approve such issuances of the Shares at an annual meeting or special meeting
held to approve such issuances.

7.   Redemption and Purchase

     (A)  Unless previously redeemed, converted or purchased and canceled as
provided herein, the Company will redeem the Notes at their principal amount on
March 31, 2007.

     (B)  (i)   If as a result of any change in, or amendment to, the laws or
regulations of the U.S. or any political sub-division of, or any authority in,
or of, the U.S. having power to tax, or any change in the application or
official interpretation of such laws or regulations, which change or amendment
becomes effective after March 31, 2002, the Company has or will become obliged
to pay additional amounts as provided or referred to in Condition 8 (and such
amendment or change has been evidenced by the delivery by the Company to the
Paying Agent (who shall, in the absence of manifest error, accept such
certificate and opinion as sufficient evidence thereof) of (x) a certificate
signed by two officers of the Company on behalf of the Company stating that such
amendment or change has occurred (irrespective of whether such amendment or
change is then effective), describing the facts leading thereto and stating that
such obligation cannot be avoided by the Company taking reasonable measures
available to it and (y) an opinion of independent legal advisers of recognized
standing to the effect that such amendment or change has occurred (irrespective
of whether such amendment or change is then effective), the Company may at its
option, having given not less than 30 nor more than 60 calendar days' notice to
the Noteholders in accordance with Condition 15 (which notice shall be
irrevocable), redeem all the Notes but not some only, at their principal amount

                                                                              18

<PAGE>

together with interest (if any) accrued to (but excluding) the Redemption Date,
provided that no notice of redemption shall be given earlier than 90 calendar
days before the earliest date on which the Company would be required to pay such
additional amounts were a payment in respect of the Notes then due.

          (ii)  The Company may, at its option and after having given not less
than 30 nor more than 60 calendar days' notice to the Noteholders in accordance
with Condition 15 (which notice shall be irrevocable), redeem the Notes for
cash, in whole or in part, at their principal amount together with interest (if
any) accrued to (but excluding) the Redemption Date. If the Company elects to
redeem less than all the Notes, Company will select which Notes to redeem by
lot, random, or such other method as it shall deem fair and appropriate. Upon
expiry of any such notice period as is referred to in this Condition 7(B) (and
subject as provided above), the Company shall be bound to redeem Notes at their
principal amount, together with interest accrued to but excluding the Redemption
Date.

          (iii) Provided that the Shares which may be issued pursuant to this
paragraph shall be Freely Tradeable and listed on a Stock Exchange, commencing
March 31, 2006, the Company may redeem upon not less than 30 nor more than 60
days notice, pursuant and subject the Conditions listed above, up to 50% of the
Outstanding Notes for Shares and, on March 31, 2007, the scheduled Maturity
Date, the Company may redeem upon not less than 30 nor more than 60 days notice
any Outstanding Notes for Shares. For the avoidance of doubt, the aggregate
principal amount of Notes that may be redeemed commencing on March 31, 2006,
shall be 50% of the principal amount of the Notes then Outstanding on such date.
If the Company elects to redeem the Notes for Shares, each Note will be redeemed
for the number of shares of Common Stock equal to 110% of the sum of the face
value of the Note plus interest accrued and unpaid thereon divided by the
average of the Market Price of the Shares over the 30 Stock Exchange Business
Day period preceding the date of notice of such redemption. If the Company
elects to redeem less than all the Notes, the Company will select which Notes to
redeem by lot, random, or such other method as it shall deem fair and
appropriate. Upon expiry of any such notice period as is referred to in this
Condition 7(B) (and subject as provided above), the Company shall be bound to
redeem Notes as described above.

     (C)  Subject to applicable law, the Company or any of its Subsidiaries may
at any time purchase Notes together with unmatured Coupons in any manner and at
any price in the open market or by private treaty. If purchases are made by
tender, tenders must be available to all Noteholders alike. Notes purchased by
the Company or any of its Subsidiaries will forthwith be surrendered for
cancellation and shall no longer be deemed Outstanding.

     (D)  All Notes which are redeemed by the Company will forthwith be canceled
(together with all related unmatured Coupons attached to or surrendered with the
Notes) and may not be reissued or resold.

8.   Taxation

     All payments in respect of the Notes by the Company shall be made without
withholding or deduction for, or on account of, any present or future taxes,
duties, assessments or governmental charges of whatever nature ("Taxes") imposed
or levied by or on behalf of the U.S. or any political sub-division of, or any
authority in, or of, the U.S. having power to tax, unless the withholding or
deduction of the Taxes is required by law. In that event, the Company will pay
such additional amounts as may be necessary in order that the net amounts
received by the Noteholders and Couponholders after the withholding or deduction
shall equal the respective amounts which would have been receivable in respect
of the Notes or, as the case may be, Coupons in the absence of the withholding
or deduction; except that no additional amounts shall be payable in relation to
any payment in respect of any Note or Coupon:

     (A)  to, or to a third party on behalf of, a Holder who is liable for the
Taxes in respect of the Note or Coupon by reason of such Holder having some
connection with the U.S. other than the mere holding of the Note or Coupon; and

     (B)  presented for payment more than 30 calendar days after the Relevant
Date except to the extent that a Holder would have been entitled to additional
amounts on presenting the same for payment on the last day of such period of 30
calendar days; or

                                                                              19

<PAGE>

     (C)  to, or to a third party on behalf of, a Holder who would not be liable
or subject to the withholding or deduction by making a declaration of
non-residence or other similar claim for exemption to the relevant tax
authority.

     Any reference in these Terms and Conditions to any amounts in respect of
the Notes shall be deemed also to refer to any additional amounts which may be
payable under this Condition.

9.   Additional Covenants

     While any Conversion Right remains exercisable, the Company will, save with
the approval of an Extraordinary Resolution:

     (1)  at all times keep available for issuance free from any preemptive
rights out of its authorized but unissued capital such number of Shares as would
enable the Conversion Rights and all other rights of subscription and exchange
for and conversion pursuant to Condition 6 into Shares to be satisfied in full;

     (2)  maintain a listing for all the issued Shares and all Shares to be
issued on the exercise of the Conversion Rights on a Stock Exchange, it being
understood that if the Company is unable to obtain or maintain such listing of
Shares and will forthwith give notice to the Noteholders in accordance with
Condition 15 of the listing, de-listing or quotation or lack of quotation of the
Shares (as a class) by any such Stock Exchange; and

     (3)  not in any way modify the rights attaching to the Shares with respect
to voting, dividends or liquidation.

10.  Prescription

     Notes and Coupons will become void unless presented for payment within
periods of ten (10) years (in the case of principal) and five (5) years (in the
case of interest) from the Relevant Date in respect of the Notes or the Coupons,
as the case may be, subject to the provisions of Condition 5.

11.  Events of Default and Enforcement

     (A)  Event of Default

     "Event of Default," wherever used in these Terms and Conditions, means any
one of the following events (whatever the reason for such Event of Default,
whether voluntary or involuntary or effected by operation of law or pursuant to
any judgment, decree or order of any court or any order, rule or regulation of
any administrative or governmental body) which shall have occurred and is
continuing:

          (1)  if default is made for a period of five (5) Business Days or more
in the payment of interest or principal due in respect of the Notes or any of
them; or

          (2)  if the Company fails to perform or observe any of its other
obligations, covenants, conditions or provisions under the Notes, these Terms
and Conditions, the Company's 5.0% Senior Notes due 2003, or the trust indenture
pursuant to which such 5.0% Senior Notes due 2003 were issued, and such failure
continues for the period of 30 calendar days (or such longer period as the
Majority Holders may in their absolute discretion permit) next following the
service by the one or more of the Holders on the Company of notice requiring the
same to be remedied; or

          (3)  if (i) any other Indebtedness of the Company becomes due and
payable prior to its Stated Maturity by reason of an event of default (howsoever
defined) or (ii) any such Indebtedness of the Company is not paid when due or,
as the case may be, within any applicable grace period or (iii) the Company
fails to pay when due (or, as the case may be, within any applicable grace
period) any amount payable by it under any present or future

                                                                              20

<PAGE>

guarantee for, or indemnity in respect of, any Indebtedness of any Person or
(iv) any security given by the Company or any subsidiary for any Indebtedness of
any Person or any guarantee or indemnity of Indebtedness of any Person by the
Company becomes enforceable by reason of default in relation thereto and steps
are taken to enforce such security save in any such case where there is a bona
fide dispute as to whether the relevant Indebtedness or any such guarantee or
indemnity as aforesaid shall be due and payable (following any applicable grace
period); provided, however, that in each such case the Indebtedness exceeds in
the aggregate U.S. $2,000,000 and in each such case such event continues
unremedied for a period of 30 calendar days (or such longer period as the
Majority Holders may in their sole discretion consent to in writing upon receipt
of written notice from the Company); or

          (4)  if the Company shall generally fail to pay its debts as such
debts come due (except debts which the Company may contest in good faith
generally) or shall be declared or adjudicated by a competent court to be
insolvent or bankrupt, shall consent to the entry of an order of relief against
it in an involuntary bankruptcy case, shall enter into any assignment or other
similar arrangement for the benefit of its creditors or shall consent to the
appointment of a custodian (including, without limitation, a receiver,
liquidator or Company); or

          (5)  if a receiver, administrative receiver, administrator or other
similar official shall be appointed in relation to the Company or in relation to
the whole or a substantial part its undertaking or assets or a distress,
execution or other process shall be levied or enforced upon or sued out against,
or an encumbrancer shall take possession of, the whole or a substantial part of
the assets of any of them and in any of the foregoing cases is not paid out or
discharged within 90 calendar days (or such longer period as the Majority
Holders may in their absolute discretion consent to in writing upon receipt of
written notice from the Company); or

          (6)  if the Company institutes proceedings to be adjudicated a
voluntary bankrupt, or shall consent to the filing of a bankruptcy proceeding
against it, or shall file a petition or answer or consent seeking organization
under the laws of the Federal Bankruptcy Code or any similar applicable U.S.
federal, state or foreign law, or shall consent to the filing of any such
petition, or shall consent to the appointment of a receiver or liquidator or
trustee or assignee (or other similar official) in bankruptcy or insolvency of
it or its Property, or shall make an assignment for the benefit of creditors, or
shall admit in writing its inability to pay its debts generally as they come
due; or

          (7)  if a decree or order by a court having jurisdiction in the
premises shall have been entered adjudging the Company a bankrupt or insolvent,
or approving as properly filed a petition seeking the reorganization of the
Company under the Federal Bankruptcy Code or any other similar applicable U.S.
federal, state or foreign law, and such decree or order shall have continued
undischarged or unstayed for a period of 90 calendar days; or a decree or order
of a court having jurisdiction in the premises for the appointment of a receiver
or liquidator or trustee or assignee (or other similar official) in bankruptcy
or insolvency of the Company or of all or substantially all of its Property, or
for the winding up or liquidation of its affairs, shall have been entered, and
such decree or order shall have continued undischarged and unstayed for a period
of 90 calendar days; or

          (8)  if a warranty, representation, or other statement made by or on
behalf of the Company contained herein or any certificate or other agreement
furnished in compliance herewith is false in any material respect when made and
such falsity continues for a period of 30 calendar days (or such longer period
as the Majority Holders may in their absolute discretion permit) next following
the service by one or more of the Holders on the Company of notice requiring the
same to be remedied; or

          (9)  if there is any final judgment or judgments for the payment of
money exceeding in the aggregate U.S. $2,000,000 outstanding against the Company
which has been outstanding for more than 60 calendar days from the date of its
entry and shall not have otherwise been discharged in full or stayed by appeal,
bond or otherwise.

     (B)  Acceleration of Maturity; Rescission and Annulment

     If an Event of Default (other than an Event of Default specified in
Condition 11(A)(6) or 11(A)(7)) occurs and is continuing, then and in every such
case the Majority Holders may declare the principal amount of all the Notes

                                                                              21

<PAGE>

and accrued and unpaid interest thereon to be due and payable immediately, by a
notice in writing to the Company, and upon any such declaration such principal
amount and accrued and unpaid interest shall become immediately due and payable.

     If an Event of Default specified in Condition 11(A)(6) or Condition
11(A)(7) occurs and is continuing, then the principal amount of all the Notes
and all accrued and unpaid interest thereon shall ipso facto become and be
immediately due and payable without any declaration or other act on the part of
any Noteholder.

     At any time after a declaration of acceleration has been made and before a
judgment or decree for payment of the money due has been obtained by the
Majority Holders as hereinafter in this Condition provided, the Majority
Holders, with written notice to the Company, may rescind and annul such
declaration and its consequences if

          (1)  the Company has paid or deposited in a manner satisfactory to
such Holders a sum sufficient to pay

               (i)   all overdue interest on all Outstanding Notes,

               (ii)  all unpaid principal of any Outstanding Notes which has
become due otherwise than by such declaration of acceleration, and interest on
such unpaid principal at the rate prescribed therefor in the Notes,

               (iii) to the extent that payment of such interest is legally
enforceable, interest on overdue interest at the rate prescribed therefor in the
Notes, and

               (iv)  all reasonable sums paid or advanced by the such Holders
hereunder; and

          (2)  all Events of Default, other than the non-payment of amounts of
principal of or interest on Notes which have become due solely by such
declaration of acceleration, have been cured or waived as provided in Condition
11(K)

     No such rescission shall affect any subsequent default or impair any right
consequent thereon.

     (C)  Collection of Indebtedness and Suits for Enforcement by the Majority
Holders

     The Company covenants that if

          (1)  default is made in the payment of any installment of interest on
any Note when such interest becomes due and payable and such default continues
for a period of five (5) Business Days, or

          (2)  default is made in the payment of the principal of any Note at
the Maturity thereof and such default continues for a period of five (5)
Business Days,

the Company will, upon demand of the Majority Holders, pay to the Holders of the
Notes, the whole amount then due and payable on the Notes for principal and
interest, and interest on any overdue principal and, to the extent that payment
of such interest shall be legally enforceable, upon any overdue installment of
interest, at the rate prescribed therefor in the Notes, and, in addition
thereto, such further amount as shall be sufficient to cover the costs and
expenses of collection, including the reasonable expenses, disbursements and
advances of the Holders, their agents and counsel, and the reasonable
compensation of such agents and counsel.

     If the Company fails to pay such amounts forthwith upon such demand, the
Majority Holders in their name, may institute a judicial proceeding for the
collection of the sums so due and unpaid, may prosecute such proceeding to
judgment or final decree and may enforce the same against the Company or any
other obligor upon the Notes and collect the moneys adjudged or decreed to be
payable in the manner provided by law out of the Property of the Company or any
other obligor upon the Notes, wherever situated.

                                                                              22

<PAGE>

     If an Event of Default occurs and is continuing, the Majority Holders may
in their discretion proceed to protect and enforce their rights and the rights
of the other Noteholders by such appropriate judicial proceedings as such
Holders shall deem most effectual to protect and enforce any such rights,
whether for the specific enforcement of any covenant or agreement in these terms
and conditions or to enforce any other proper remedy.

     (D)  Majority Holders May File Proofs of Claim

     In case of the pendency of any receivership, insolvency, liquidation,
bankruptcy, reorganization, arrangement, adjustment, composition or other
judicial proceeding relative to the Company or any other obligor upon the Notes
or the Property of the Company or of such other obligor or their creditors, the
Majority Holders (irrespective of whether the principal of the Notes shall then
be due and payable as therein expressed or by declaration or otherwise and
irrespective of whether the Majority Holders shall have made any demand on the
Company for the payment of overdue principal or interest) shall be entitled and
empowered, by intervention in such proceeding or otherwise,

          (1)  to file and prove a claim for the whole amount of principal and
interest owing and unpaid in respect of the Notes and to file such other papers
or documents as may be necessary or advisable in order to have the claims of the
Holders (including any claim for the reasonable expenses, disbursements and
advances of such Holders, their agents and counsel) and of the other Noteholders
allowed in such judicial proceeding, and the reasonable compensation of such
agents and counsel, and

          (2)  to collect and receive any moneys or other Property payable or
deliverable on any such claims and to distribute the same;

and any custodian, receiver, assignee, trustee, liquidator, sequestrator or
similar official in any such judicial proceeding is hereby authorized by each
Noteholder to make such payments to the Majority Holders due them for the
reasonable expenses, disbursements and advances of such Holders, their agents
and counsel and the reasonable compensation of such agents and counsel, and to
pay to the Paying Agent (where one is appointed) all such other sums due under
the Notes. In the absence of such appointment, any such sums shall be paid for
the rateable benefit of all the Noteholders.

     Nothing herein contained shall be deemed to authorize the Majority Holders,
except as permitted by law and these Terms and Conditions, to authorize or
consent to or accept or adopt on behalf of any Noteholder any plan of
reorganization, arrangement, adjustment or composition affecting the Notes or
the rights of any Noteholder thereof, or to authorize the such Holder to vote in
respect of the claim of any Noteholder in any such proceeding, except to the
extent permitted by law.

     (E)  Majority Holders May Enforce Claims Without Possession of Notes

     All rights of action and claims under these Terms and Conditions may be
prosecuted and enforced by the Majority Holders without the possession of any of
the Notes or the production thereof in any proceeding relating thereto, and any
such proceeding instituted by the Majority Holders shall be brought in their own
name and any recovery of judgment shall, after provision for the payment of the
reasonable compensation, expenses, disbursements and advances of the Majority
Holders, their agents and counsel, be paid to the Paying Agent (where one is
appointed) for the rateable benefit of all the Noteholders in respect of which
such judgment has been recovered.

     (F)  Application of Money Collected

     Any money collected by the Majority Holder pursuant to this Condition shall
be applied in the following order in case of the distribution of such money on
account of principal or interest, upon presentation of the Notes and the
notation thereon of the payment if only partially paid and upon surrender
thereof if fully paid:

                                                                              23

<PAGE>

          FIRST: To the payment of the amounts then due and unpaid for principal
of and interest on the Notes in respect of which or for the benefit of which
such money has been collected, ratably, without preference or priority of any
kind, according to the amounts due and payable on such Notes for principal and
interest, respectively; and

          SECOND: The balance, if any, to the Person or Persons entitled
thereto.

     (G)  Unconditional Right of Holders to Receive Principal and Interest

     Notwithstanding any other provision in these Terms and Conditions, the
Holder of any Note or of any Coupon, as the case may be, shall have the right,
which is absolute and unconditional, to receive payment, as provided herein and
in such Note of the principal of and interest on, such Note on the respective
Stated Maturity or expressed in such Note (or, in the case of redemption, on the
Redemption Date) or Coupon and to institute suit for the enforcement of any such
payment, and such rights shall not be impaired without the consent of such
Holder; provided, that all monies paid by the Company to the Paying Agent for
the payment of principal or interest on any Note which remain unclaimed at the
end of two (2) years after the Stated Maturity or Redemption Date of such Note
will be repaid to the Company and the Holder of any Note or Coupon shall
thereafter have only the rights of a creditor of the Company or such rights as
may be otherwise provided by applicable law.

     (H)  Restoration of Rights and Remedies

     If the Majority Holders or any Noteholder has instituted any proceeding to
enforce any right or remedy under these Terms and Conditions and such proceeding
has been discontinued or abandoned for any reason, or has been determined
adversely to the Majority Holders or to such Noteholder, then and in every such
case, subject to any determination in such proceeding, the Company, the Majority
Holders and the Noteholders shall be restored severally and respectively to
their former positions hereunder and thereafter all rights and remedies of the
Majority Holders and the Noteholders shall continue as though no such proceeding
had been instituted.

     (I)  Rights and Remedies Cumulative

     Except as otherwise provided with respect to the replacement or payment of
mutilated, destroyed, lost or stolen Notes as provided herein, no right or
remedy herein conferred upon or reserved to the Noteholders is intended to be
exclusive of any other right or remedy, and every right and remedy shall, to the
extent permitted by law, be cumulative and in addition to every other right and
remedy given hereunder or now or hereafter existing at law or in equity or
otherwise. The assertion or employment of any right or remedy hereunder, or
otherwise, shall not prevent the concurrent assertion or employment of any other
appropriate right or remedy.

     (J)  Delay or Omission Not Waiver

     No delay or omission of the Majority Holders or Holder of any Note to
exercise any right or remedy accruing upon any Event of Default shall impair any
such right or remedy or constitute a waiver of any such Event of Default or an
acquiescence therein. Every right and remedy given by this Article or by law to
the Noteholders may be exercised from time to time, and as often as may be
deemed expedient, by the Noteholders.

     (K)  Waiver of Past Defaults

     Subject to Condition 11(B), the Majority Holders may on behalf of the
Holders of all the Notes waive any past default hereunder and its consequences,
except a default

          (1)  in respect of the payment of the principal of or interest on any
Note, or

          (2)  in respect of a covenant or provision hereof which under
Condition 17 cannot be modified or amended without the consent of the Holder of
each Outstanding Note affected.

                                                                              24

<PAGE>

     Upon any such waiver, such default shall cease to exist, and any Event of
Default arising therefrom shall be deemed to have been cured, for every purpose
of these Terms and Conditions; but no such waiver shall extend to any subsequent
or other default or Event of Default or impair any right consequent thereon.

     (L)  Waiver of Stay or Extension Laws

     The Company covenants (to the extent that it may lawfully do so) that it
will not at any time insist upon, or plead, or in any manner whatsoever claim or
take the benefit or advantage of, any stay or extension law wherever enacted,
now or at any time hereafter in force, which may affect the covenants or the
performance of these Terms and Conditions; and the Company (to the extent that
it may lawfully do so) hereby expressly waives all benefit or advantage of any
such law.

     (M)  Requirements Regarding Agents

     (1)  At any time after an Event of Default has occurred and is continuing
the Majority Holders shall notify in writing the Company and the Paying Agent,
and may by notice in writing to the Company and the Paying Agent:

          (i)   require the Paying Agent, until notified to the contrary by
Majority Holders, to hold all Notes and Coupons and all moneys, documents and
records held by it in respect of Notes and Coupons to the order of the Holders;
or

          (ii)  require the Paying Agent to deliver to the Holders on a pro rata
basis all funds held by it for the benefit of the Holders, and to deliver the
documents and records held by it in respect of Notes and Coupons to the Holders,
provided that such notice shall be deemed not to apply to any documents or
records which the relevant Paying Agent is obliged to release by any law or
regulation; and

          (iii) require the Company to make all subsequent payments in respect
of the Notes and Coupons to or to the order of the Holders and not to the Paying
Agent.

     (2)  The Majority Holders shall notify the Paying Agent immediately upon
the cure or waiver of an Event of Default. Upon receipt of such notice, the
provisions of this Condition 11(M) shall no longer apply.

     (3)  Prior to taking any action under this Agreement at the direction of
any Person with respect to the Notes, the Paying Agent shall be entitled to
receive (and shall receive) indemnity or security satisfactory to it.

12.  Liability Solely Corporate

     No recourse shall be had for the payment of the principal of or interest on
any Notes or any part thereof, or for any claim based thereon or otherwise in
respect thereof, or of the indebtedness represented thereby, or upon any
obligation, covenant or agreement in these Terms and Conditions, against any
incorporator, or against any stockholder, officer or director, as such, past,
present or future, of the Company, or of any predecessor or successor Person,
either directly or through the Company or any such predecessor or successor
Person, whether by virtue of any constitution, statute or rule of law, or by the
enforcement of any assessment or penalty or otherwise, it being expressly agreed
and understood that the Notes and these Terms and Conditions which are a part
thereof are solely corporate obligations, and that no personal liability
whatsoever shall attach to, or be insured by, any such incorporator,
stockholder, officer or director, as such, past, present or future, of the
Company or of any predecessor or successor Person, either directly or through
the Company or any such predecessor or successor Person, because of the
indebtedness hereby authorized or under or by reason of any of the obligations,
covenants, promises or agreements contained in the Notes or the these Terms and
Conditions which constitute a part thereof or to be implied herefrom; and that
any such personal liability is hereby expressly waived and released as a
condition of, and as part of the consideration for the exchange transaction
pursuant to which the Notes were issued; provided, however, that nothing herein
contained shall be taken to prevent recourse to and the enforcement of the
liability, if any, of any stockholder or subscriber to capital stock of the
Company upon or in respect of shares of capital stock not fully paid

                                                                              25

<PAGE>

up.

13.  Defeasance and Covenant Defeasance

     (A)  Company's Option to Effect Defeasance or Covenant Defeasance

     The Company may, at its option by Board Resolution, at any time, with
respect to the Notes, elect to have either Condition 13(B) or Section 13(C)
applied to all Outstanding Notes upon compliance with the conditions set forth
below in this Condition, The Company shall promptly give notice of such election
to the Holders.

     (B)  Legal Defeasance and Discharge

     Upon the Company's exercise under Condition 13(A) of the option applicable
to this Condition 13(B), the Company shall be deemed to have been discharged
from its obligations with respect to all Outstanding Notes on the date the
conditions set forth in Condition 13(D) are satisfied (hereinafter, "legal
defeasance"). For this purpose, such legal defeasance means that the Company
shall be deemed to have paid and discharged the entire indebtedness represented
by the Outstanding Notes, which shall thereafter be deemed to be "Outstanding"
only for the purposes of Condition 13(E) and the other Conditions of these Terms
and Conditions referred to in (1) and (2) below, and to have satisfied all its
obligations under such Notes, including the obligation to pay interest on the
Notes, and these Terms and Conditions insofar as such Notes are concerned (and
the Holders, at the expense of the Company, shall execute proper instruments
acknowledging the same), except for the following which shall survive until
otherwise terminated or discharged hereunder: (1) the rights of Holders of
Outstanding Notes to receive, solely from the trust fund described in Condition
13(D) and as more fully set forth in such Condition, payments in respect of the
principal of and interest on such Notes when such payments are due, and (B) the
Company's obligations with respect to the Notes under Conditions 1(D), 1(E),
1(H), 3(D) or 3(L). Subject to compliance with this Condition, the Company may
exercise its option under this Condition 13(B) notwithstanding the prior
exercise of its option under Condition 13(C) with respect to the Notes.

     (C)  Covenant Defeasance

     Upon the Company's exercise under Section Condition 13(A) of the option
applicable to this Condition 13(C), the Company shall be released from its
obligations under any covenant contained in Condition 3 (except Condition 3(D)
with respect to the Outstanding Notes on and after the date the conditions set
forth in Section 13(D)) are satisfied (hereinafter, "covenant defeasance"), and
the Notes shall thereafter be deemed not to be "Outstanding" for the purposes of
any request, demand, authorization, direction, declaration, notice, consent,
waiver or Act of Noteholders (and the consequences of any thereof) in connection
with such covenants, but shall continue to be deemed "Outstanding" for all other
purposes hereunder. For this purpose, such covenant defeasance means that, with
respect to the Outstanding Notes, the Company may omit to comply with and shall
have no liability in respect of any term, condition or limitation set forth in
any such covenant, whether directly or indirectly, by reason of any reference
elsewhere herein to any such covenant or by reason of any reference in any such
covenant to any other provision herein or in any other document and such
omission to comply shall not constitute a Default or an Event of Default under
Condition 11(A)(4) , but, except as specified above, the remainder of these and
the Notes shall be unaffected thereby.

     (D)  Conditions to Legal Defeasance or Covenant Defeasance

     The following shall be the conditions to application of either Condition
13(B) or Section 13 (C) to the Outstanding Notes:

          (1)  The Company shall irrevocably have deposited or caused to be
deposited with the Paying Agent as trust funds in trust for the purpose of
making the following payments, specifically pledged as security for, and
dedicated solely to, the benefit of the Holders of such Notes, (A) money in an
amount, or (B) U.S. Government Obligations which through the scheduled payment
of principal and interest in respect thereof in accordance with their terms will
provide, not later than one day before the due date of any payment, money in an
amount, or (C) a

                                                                              26

<PAGE>

combination thereof, sufficient, in the opinion of a nationally recognized firm
of independent public accountants expressed in a written certification thereof
delivered to the Paying Agent, to pay and discharge, and which shall be applied
by the Paying Agent to pay and discharge, the principal of and interest on the
Outstanding Notes on the Stated Maturity (or Redemption Date, if applicable) of
such principal or installment of interest; provided that the Paying Agent shall
have been irrevocably instructed to apply such money or the proceeds of such
U.S. Government Obligations to said payments with respect to the Notes; and
provided further that, upon the effectiveness of this Condition 13(D), the money
or U.S. Government Obligations deposited shall not be subject to the rights of
the Noteholders pursuant to the provisions of this Condition. Before or after
such a deposit, the Company may give to the Paying Agent a notice of its
election to redeem all of the Outstanding Notes at a future date in accordance
with Condition 7, which notice shall be irrevocable. Such irrevocable redemption
notice, if given, shall be given effect in applying the foregoing.

          (2)  No Default or Event of Default with respect to the Notes shall
have occurred and be continuing on the date of such deposit or, insofar as
paragraphs (6) and (7) of Condition 11(A) hereof are concerned, at any time
during the period ending on the 91st day after the date of such deposit (it
being understood that this condition shall not be deemed satisfied until the
expiration of such period).

          (3)  No event or condition shall exist that pursuant to the provisions
of Condition 13(B) or 13(C) would prevent the Company from making payments of
the principal of or interest on the Notes on the date of such deposit or at any
time during the period ending on the 91st day after the date of such deposit (it
being understood that this condition shall not be deemed satisfied until the
expiration of such period).

          (4)  Such legal defeasance or covenant defeasance shall not result in
a breach or violation of, or constitute a default under any material agreement
or material instrument to which the Company is a party or by which it is bound.

          (5)  In the case of an election under Condition 13(B), the Company
shall have delivered to the Paying Agent an Opinion of Counsel stating that the
Holders of the Outstanding Notes will not recognize income, gain or loss for
U.S. federal income tax purposes as a result of such defeasance and will be
subject to federal income tax on the same amounts, in the same manner and at the
same times as would have been the case if such defeasance had not occurred.

          (f)  The Company shall have delivered to the Paying Agent an Officers'
Certificate and an Opinion of Counsel, each stating that all conditions
precedent provided for relating to either the legal defeasance under Section
13(B) or the covenant defeasance under Section 13(C) (as the case may be) have
been complied with.

     (E)  Deposited Money and U.S. Government Obligations to Be Held in Trust;
Other Miscellaneous Provisions

     Subject to the provisions of the disposition of unclaimed moneys contained
herein, all money and U.S. Government Obligations (including the proceeds
thereof) deposited with the Paying Agent pursuant to Condition 13(D) in respect
of the Outstanding Notes shall be held in trust and applied by the Paying Agent,
in accordance with the provisions of these terms and conditions, to the payment,
either directly or through the Paying Agent (including the Company acting as its
own Paying Agent) to the Holders of the Notes of all sums due and to become due
thereon in respect of principal and interest, but such money and U.S. Government
Obligations need not be segregated from other funds except to the extent
required by law.

     (F)  Reinstatement

     If the Paying Agent is unable to apply any money or U.S. Government
Obligations in accordance with Condition 13(E) by reason of any order or
judgment of any court or governmental authority enjoining, restraining or
otherwise prohibiting such application, then the Company's obligations under
these Terms and Condition shall be revived and reinstated as though no deposit
had occurred pursuant to Section Condition 13(B) or 13(C), as the case may be,
until such time as the Paying Agent is permitted to apply all such money or U.S.
Government Obligations in

                                                                              27

<PAGE>

accordance with Condition 13(E); provided, however, that no action taken in good
faith by the Company after a deposit of money or U.S. Government Obligations or
both pursuant to Condition 13(E) and prior to the revival and reinstatement of
obligations under these Terms and Conditions pursuant to this Condition 13(F)
shall constitute the basis for the assertion of an Event of Default pursuant to
Condition 11; and provided, further, that if the Company makes any payment of
principal of or interest on any Note following the reinstatement of its
obligations, the Company shall be subrogated to the rights of the Holders of
such Notes to receive such payment from the money or U.S. Government Obligations
held by the Paying Agent.

14.  Replacement of Notes and Coupons

     As provided in Conditions 1(H), should any Note or Coupon be lost, stolen,
mutilated, defaced or destroyed, it may be replaced at the specified office of
the Paying Agent upon payment by the claimant of the expenses incurred in
connection with the replacement and on such terms as to evidence indemnity and
security as the Company may reasonably require. Mutilated or defaced Notes or
Coupons must be surrendered before replacements will be issued.

15.  Notices

     (A)  Notices to all the Noteholders will be valid if published in one
Authorized Newspaper (unless another form of notice is permitted by these Terms
and Conditions) with a copy provided to RP&C International, Limited. Any notice
shall be deemed to have been given on the date of publication or, if so
published more than once, on the date of the first publication. If publication
as provided above is not practicable, notice will be given in such other manner,
and shall be deemed to have been given on such date, as the Company may approve.

     (B)  Couponholders will be deemed for all purposes to have notice of the
contents of any notice given to the Noteholders in accordance with this
Condition.

     (C)  Any request, demand, authorization, direction, declaration, notice,
consent, waiver, Extraordinary Resolution or Act of Noteholders or other
document provided or pertained by these Terms and Conditions (herein
collectively called "Notice") to be made upon, given or furnished to, or filed
with the Company by any Noteholder shall be sufficient for every purpose
hereunder (unless otherwise herein expressly provided) if made, given, furnished
or filed in writing to or with the Company addressed to it at the address of its
principal office which shall initially be: Harken Energy Corporation, 580
WestLake Park Boulevard, Suite 600, Houston, Texas 77079, Attention: Mikel D.
Faulkner, Chief Executive Officer Tel. (281) 504-4000, Fax, (281) 504-4100; with
a copy to A. Wayne Hennecke, Senior Vice President-Finance and Secretary: Tel.
(281) 504-4040, Fax. (281) 504-4110.

16.  Acts of Noteholders, Meetings of Noteholders

     (A)  Any Extraordinary Resolution, request, demand, authorization,
direction, declaration, notice, consent, waiver or other action provided by
these Terms and Conditions to be given or taken by Noteholders may be embodied
in and evidenced by one or more instruments of substantially similar tenor
signed by such Noteholders in person or by agents duly appointed in writing;
and, except as herein otherwise expressly provided, such action shall become
effective when such instrument or instruments are delivered to the Company. Such
instrument or instruments (and the action embodied therein and evidenced
thereby) are herein sometimes referred to as the "Act" of the Noteholders
signing such instrument or instruments. Proof of execution of any such
instrument or of a writing appointing any such agent shall be sufficient for any
purpose of these Terms and Conditions and conclusive in favor of the Company, if
made in the manner provided in this Condition

     (B)  The fact and date of the execution by any Person of any such
instrument or writing may be proved by the affidavit of a witness of such
execution or by a certificate of a notary public or other officer authorized by
law to take acknowledgments of deeds, certifying that the individual signing
such instrument or writing acknowledged to such witness, notary public or other
such officer the execution thereof. Where such execution is by a signer acting
in a capacity other than such signer's individual capacity, such certificate or
affidavit shall also constitute sufficient

                                                                              28

<PAGE>

proof of authority. The fact and date of the execution of any such instrument or
writing, or the authority of the Person executing the same, may also be proved
in any other manner which the Company deems sufficient.

     (C)  Any Extraordinary Resolution, request, demand, authorization,
direction, notice, consent, waiver or other Act of the Holders of any Note shall
bind every future Holder of the same Note and the Holder of every Note issued
upon conversion or redemption thereof or in exchange therefor or in lieu thereof
in respect of anything done, omitted or suffered to be done by the Company or
any Paying or Conversion Agent in reliance thereon, whether or not notation of
such action is made upon such Note.

     (D)  The Noteholders may convene a meeting at any time and from time to
time to consider any matter affecting the Holders of the Notes, including the
modification of the Terms and Conditions and to make, give or take any request,
demand, authorization, direction, notice, consent, waiver or other action
provided by this these Terms and Conditions to be made, given or taken by
Holders of the Notes.

     (E)  Notice of every meeting of the Holders of the Notes, setting forth the
time and the place of such meeting and in general terms the action proposed to
be taken at such meeting, shall be given in the manner provided in Condition 15,
not less than 21 nor more than 180 days prior to the date fixed for the meeting.

     (F)  To be entitled to vote at any meeting of Holders of the Notes, a
Person shall be (i) a Holder of one or more Outstanding Notes, or (ii) a Person
appointed by an instrument in writing as proxy for a Holder or Holders of one or
more Outstanding Notes by such Holder or Holders. The only Persons who shall be
entitled to be present or to speak at any meeting of Noteholders shall be the
Persons entitled to vote at such meeting and their counsel, any representatives
of the Company, and their respective counsel.

     (G)  The quorum at any meeting for passing any Extraordinary Resolution
will be one or more Persons present holding or representing 50% or more in
principal amount of the Outstanding Notes as of the date of the meeting, or at
any adjourned such meeting one or more Persons present whatever the principal
amount of the Notes held or represented by such Person and the vote required for
passing an Extraordinary Resolution at such meeting will be not less than a
majority of the principal amount of the Outstanding Notes and represented at
such meeting or adjournment thereof; provided, that at any meeting, the business
of which includes the modification of the provisions of the Terms and Conditions
and the provisions of these Terms and Conditions, the necessary quorum and vote
required for passing an Extraordinary Resolution will be one or more Persons
present holding or representing not less than a majority, or at any adjourned
such meeting not less than one-third, of the principal amount of the Outstanding
Notes. An Extraordinary Resolution passed at any meeting of the Holders of the
Notes will be binding on all Holders of the Notes, whether or not such
Noteholders are present at the meeting, and on the Holders of all Coupons.

17.  Amendments to Terms and Conditions

     (A)  Amendments with Consent of Noteholders

     With the consent of the Holders of a majority in principal amount of the
Notes Outstanding, the Company, when authorized by a Board Resolution, may amend
these Terms and Conditions for the purpose of adding any provisions to or
changing in any manner or eliminating any of the provisions hereof or of
modifying in any manner the rights of the Noteholders hereunder; provided,
however, that no such amendment shall, without the consent of the Holder of each
Outstanding Note affected thereby:

          (1)  change the Stated Maturity of the principal of, or any
installment of principal of or interest on, any Note, or reduce the principal
amount thereof or the rate of interest thereon, or change the coin or currency
in which any Note or the interest thereon is payable, or impair the right to
institute suit for the enforcement of any such payment after the Stated Maturity
thereof (or, in the case of redemption, on or after the Redemption Date), or

                                                                              29

<PAGE>

          (2)  reduce the percentage in principal amount of the Outstanding
Notes, the consent of whose Holders is required for any amendment of these terms
and conditions, or the consent of whose Holders is required for any waiver of
compliance with certain provisions of these Terms and Conditions or certain
defaults hereunder and their consequences provided for herein, or

          (3)  modify any of the provisions of Condition 11(K), except to
increase any such percentage or to provide that certain other provisions of
these Terms and Conditions be modified or waived without the consent of the
Holder of each Outstanding Note affected thereby,

          (4)  modify any of the provisions of these Terms and Conditions
relating to the subordination of the Notes in a manner adverse to the Holders
thereof, or

          (5)  modify any of the provisions of these Terms and Conditions
relating to Conversion Rights or redemption rights.

     It shall not be necessary for any Act of Noteholders under this Section to
approve the particular form of any proposed amendment to the Terms and
Conditions, but it shall be sufficient if such Act shall approve the substance
thereof.

     (B)  Effect of Amendments

     Upon the entering into of an amendment of these Terms and Conditions
pursuant to the terms hereof, these Terms and Conditions shall be modified in
accordance therewith, and amendment shall form a part of these Terms and
Conditions for all purposes; and every Holder of Notes theretofore or thereafter
delivered hereunder shall be bound thereby.

18.  Governing Law

     The Notes, including these Terms and Conditions, the Coupons, and the
Agency Agreement are governed by, and will be construed in accordance with, the
laws of the State of New York.

19.  Definitions of Certain Terms

     "Act," when used with respect to any Noteholder, has the meaning specified
in Condition 16.

     "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person and the terms "controlling" and "controlled"
have meanings correlative to the foregoing.

     "Authenticating Agent" means The Bank of New York

     "Authorized Denomination" means U.S. $1,000.

     "Authorized Newspaper" means The Financial Times (European Edition) of
London, England. If such newspaper shall cease to be published, the Company
shall substitute for it another newspaper in Europe, customarily published at
least once a day for at least five (5) days in each calendar week, of general
circulation. If, because of temporary suspension of publication or general
circulation of such newspaper or for any other reason, it is impossible or, in
the opinion of the Company, impracticable to make any publication of any notice
required by these Conditions in the manner herein provided, such publication or
other notice in lieu thereof which is made by the Company in the exercise of its
reasonable discretion shall constitute a sufficient publication of such notice.

     "Board of Directors" means either the board of directors of the Company or
any duly authorized committee of that board.

                                                                              30

<PAGE>
     "Business Day" means each Monday, Tuesday, Wednesday, Thursday and Friday
which is a day on which banking institutions in the City of New York, New York,
and London, England are not authorized or obliged by law, regulation or
executive order to close.

     "Capitalized Lease Obligation" means the amount of the liability under any
capital lease that, in accordance with GAAP, is required to be capitalized and
reflected as a liability on the balance sheet of the relevant Person.

     "Clearstream" means Clearstream, societe anonyme.

     "Commission" means the Securities and Exchange Commission, as from time to
time constituted or, if at any time after the Issue Date such Commission is not
existing, then the body performing similar duties at such time.

     "Common Depository" means the common depository appointed by Morgan
Guaranty Trust Company of New York, Brussels office, as operator of the
Euroclear System, and Clearstream, societe anonyme, which shall initially be The
Bank of New York, including the nominees and successors of any Common
Depository.

     "Common Stock" means, with respect to any Person, any and all shares,
interests, participation and other equivalents (however designated, whether
voting or non-voting) of such Person's common stock, whether now outstanding or
issued after the Issue Date, and includes, without limitation, all series and
classes of such common stock.

     "Company" means Harken Energy Corporation, until a successor Person shall
have become such pursuant to the applicable provisions of these Terms and
Conditions, and thereafter "Company" shall mean such successor Person.

     "Conversion Agent" means any Person (including the Company acting as
Conversion Agent) authorized by the Company to effect conversions of the Notes
on behalf of the Company. Pursuant to the terms hereof, the Company has
initially appointed The Bank of New York to act as the Conversion Agent.

     "Conversion Date" means the Business Day during the Conversion Period on
which the Conversion Right is exercised by delivery to the Conversion Agent of
the Note surrendered for conversion and the completed notice of a Noteholder's
intention to exercise its Conversion Right (as set forth in Exhibit A hereto)
with respect to any Note.

     "Conversion Period" means, with respect to any Note, the period which
begins after the earlier to occur of (I) the close of the effective date of a
Registration Statement filed by the Company with the Commission with respect to
the Shares or (II) the date such Shares may be sold pursuant to the exemption
from registration under the Securities Act provided by Rule 144 or other
exemption from registration under the Securities Act, and ends upon the earliest
to occur of (A) the second Business Day prior to the later of March 31, 2007, or
the date on which all principal and interest on the Note is repaid in full, (B)
if such Notes shall have been called for redemption pursuant to Condition 7 of
these Terms and Conditions, the close of the second Business Day prior to the
Redemption Date, or (C) the effective date of a Mandatory Conversion.

     "Conversion Price" means, in respect of a Conversion Right, initially U.S.
$0.50.

     "Conversion Right" means the right of a Holder of any Note to convert such
Note into Conversion Shares.

     "Conversion Shares" means the Shares into which the Notes are convertible.

     "Corporation" includes corporations, limited liability companies, limited
and general partnerships, associations, joint-stock companies and business
trusts.

     "Coupon" means bearer interest Coupons relating to the definitive Notes in
bearer form and any replacement Coupons issued therefore

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<PAGE>

     "Couponholder" means a Person who is the bearer of any Coupon.

     "Default Rate" means, with respect to the Notes, ten percent (10%) per
annum.

     "Effective Date" means the first Business Day following the date upon which
the Commission declares to be effective a registration statement filed by the
Company pursuant to the Securities Act relating to the Conversion Shares.

     "Euroclear" means the Euroclear System.

     "Extraordinary Resolution" means a resolution passed at a meeting of the
Noteholders duly convened and held in these Terms and Conditions.

     "Federal Bankruptcy Code" means the Bankruptcy Act or Title 11 of the
United States Code, as amended from time to time.

     "Freely Tradable" means, with respect to the Notes and the Conversion
Shares and redemption Shares, that under the Securities Act the holders thereof
may then offer and sell any amount of such outstanding securities to the public
in the United States without restrictions in transactions that are not brokers'
transactions (as defined in the Securities Act) either (i) pursuant to an
effective registration statement then in effect or (ii) pursuant to Rule 144(k).
For purposes of determining whether such securities are Freely Tradable, it
shall be assumed that no person that directly, or indirectly through one or more
intermediaries, controls, or is controlled by, or is under common control with,
the Company has ever held such securities from and after their issuance.

     "Generally Accepted Accounting Principles" or "GAAP" means generally
accepted accounting principles in the United States, as applied from time to
time by the Company and its Subsidiaries in the preparation of its financial
statements.

     "Guaranty" means all obligations of any Person (other than endorsements in
the ordinary course of business of negotiable instruments for deposit or
collection) of such Person guaranteeing or in effect guaranteeing any
Indebtedness, dividend or other obligation, of any other Person (the "primary
obligor") in any manner, whether directly or indirectly, including without
limitation all obligations incurred through an agreement, contingent or
otherwise, by such Person: (i) to purchase such Indebtedness or obligation or
any Property or assets constituting security therefor, or (ii) to advance or
supply funds (1) for the purchase or payment of such Indebtedness or obligation,
or (2) to enable the recipient of such funds to maintain certain financial
conditions (e.g. agreed amount of working capital) under loan or similar
documents, or (iii) to lease Property or to purchase securities or other
Property or services primarily for the purpose of assuring the owner of such
Indebtedness or obligation of the ability of the primary obligor to make payment
of the Indebtedness or obligation, or (iv) otherwise to assure the owner of the
Indebtedness or obligation of the primary obligor against loss in respect
thereof. For the purposes of all computations made under these Terms and
Conditions, a Guaranty in respect of any Indebtedness shall be deemed to be
Indebtedness equal to the principal amount and accrued interest of such
Indebtedness which has been guaranteed, and a Guaranty in respect of any other
obligation or liability or any dividend shall be deemed to be Indebtedness equal
to the maximum aggregate amount of such obligation, liability or dividend.

     "Holder or Noteholder" means a Person in whose name a Note is registered on
the Paying Agent's books, or if a Note is not in registered form, a Person who
is a bearer of a Note or Coupon, as the case may be.

     "Indebtedness" of any Person means and includes all present and future
obligations of such Person, which shall include all obligations (i) which in
accordance with generally accepted accounting principles in the United States
shall be classified upon a balance sheet of such Person as liabilities of such
Person, (ii) for borrowed money, (iii) which have been incurred in connection
with the acquisition of Property (including, without limitation, all obligations
of such Person evidenced by any debenture, bond, note, commercial paper or other
similar security, but excluding, in any case, obligations arising from the
endorsement in the ordinary course of business of negotiable instruments for
deposit or collection), (iv) secured by any Lien existing on Property owned by
such Person, even

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<PAGE>

though such Person has not assumed or become liable for the payment of such
obligations, (v) created or arising under any conditional sale or other title
retention agreement with respect to Property acquired by such Person,
notwithstanding the fact that the rights and remedies of the seller, lender or
lessor under such agreement in the event of default are limited to repossession
or sale of such Property, (vi) which are Capitalized Lease Obligations, (vii)
for all Guaranties, whether or not reflected in the balance sheet of such Person
and (viii) which are all reimbursement and other payment obligations (whether
contingent, matured or otherwise) of such Person in respect of any acceptance or
documentary credit. Notwithstanding the foregoing, Indebtedness shall not
include (i) Indebtedness incidental to the operation of the business of the
Person in the ordinary course and in the aggregate not material to the business
and operations of the Person, (ii) Indebtedness for which the Company or any of
its Subsidiaries are the sole obligors and obligees, and (iii) Indebtedness
represented by purchase, rental or lease obligations not to exceed $1,000,000 in
any period of 12 months for any Person and its Subsidiaries.

     "Interest Payment Date" means the Stated Maturity of an installment of
interest on the Notes.

     "Issue Date" means May 23, 2003.

     "Lien" means any mortgage, charge, pledge, lien, security interest or
encumbrance of any kind whatsoever, including any interest in Property securing
an obligation owed to, or a claim by, a Person other than the owner of the
Property, whether such interest is based on the common law, statute or contract,
and including but not limited to the security interest lien arising from a
mortgage, encumbrance, pledge, conditional sale or trust receipt or a lease,
consignment or bailment for security purposes. The term "Lien" shall include
reservations, exceptions, encroachments, easements, rights-of-way, covenants,
conditions, restrictions, leases and other title exceptions and encumbrances
affecting Property. For the purposes of these Terms and Conditions, the Company
or its Subsidiary shall be deemed to be the owner of any Property which it has
acquired or holds subject to a conditional sale agreement, financing lease or
other arrangement pursuant to which title to the Property has been retained by
or vested in some other Person for security purposes.

     "Majority Holders" means the Holders of a majority of the principal amount
of Notes Outstanding.

     "Mandatory Conversion" means conversion of the Notes at the option of the
Company pursuant to Condition 6D.

     "Market Price" means the daily closing sale price of the Shares for a Stock
Exchange Business Day on a Stock Exchange.

     "Maturity," when used with respect to any Note, means the date on which the
principal of such Note becomes due and payable as therein or herein provided,
whether at the Stated Maturity or the Redemption Date and whether by declaration
of acceleration, call for redemption or otherwise.

     "Outstanding," when used with respect to Notes, means, as of the date of
determination, all Notes theretofore issued, except: (1) Notes heretofore
cancelled by the Paying and Conversion Agent or delivered to the Paying and
Conversion Agent for cancellation; (2) Notes, or portions thereof, for whose
payment or redemption money in the necessary amount has been theretofore
deposited any Paying Agent (other than the Company) in trust or set aside and
segregated in trust by the Company (if the Company shall act as its own Paying
Agent) for the Holders of such Notes; provided that, if such Notes are to be
redeemed, notice of such redemption has been duly given or provision therefor
satisfactory to the a Paying Agent has been made; (3) Notes, except to the
extent provided in Conditions 13 (B) and 13(C), with respect to which the
Company has effected defeasance and/or covenant defeasance as provided in
Condition 13; and (4) Notes which have been paid pursuant to or in exchange for
or in lieu of which other Notes have been issued, however, that in determining
whether the Holders of the requisite principal amount of Outstanding Notes have
taken any Act or given or made any Extraordinary Resolution, Notes owned by the
Company or any other obligor upon the Notes or any Affiliate of the Company
(other than Persons whose Affiliate relationship arises solely from ownership of
Conversion Shares) or such other obligor shall be disregarded and deemed not to
be Outstanding.

f-FTW_186041_4_.doc                                                           33

<PAGE>

     "Paying Agent" means any Person (including the Company acting as Paying
Agent) authorized by the Company to pay the principal of or interest on any
Notes on behalf of the Company. Pursuant to the terms and conditions hereof, the
Company has initially appointed The Bank of New York as the Paying Agent

     "Person" means any individual, corporation, limited liability company,
limited or general partnership, joint venture, association, joint-stock company,
trust, unincorporated organization or government or any agency or political
subdivision thereof.

     "Preferred Stock" means, with respect to any Person, any and all shares,
interests, participation or other equivalents (however designated) of such
Person's preferred or preference stock whether now outstanding or issued on or
after the Issue Date, and includes, without limitation, all classes and series
of preferred or preference stock.

     "Presentation Date" means the date on which a Note is presented by a
Noteholder for payment of principal or a Coupon is presented by the Couponholder
for payment of interest, as the case may be, or if such date is not a Business
Day in London and New York, the next date which is a Business Day in each of the
foregoing cities.

     "Property" or "Properties" means any kind of property or asset, whether
real, personal or mixed, or tangible or intangible, and any interest therein.

     "Record Date" means the 15th day preceding each Interest Payment Date
whether or not a Business Day.

     "Redemption Date," when used with respect to any Note to be redeemed, in
whole or in part, means the date fixed for such redemption by or pursuant to
these Terms and Conditions.

     "Redemption Price," when used with respect to any Note and Coupons to be
redeemed, means the price at which they are to be redeemed pursuant to the terms
hereof, plus accrued and upaid interest to, but excluding, the Redemption Date,
if applicable expressed in a number of Conversion Shares into which such Note
shall be converted in the event the Notes and/or Coupons are to be redeemed for
Shares and, in the event of any other redemption, a cash amount.

     "Relevant Date" means the date on which the payment first becomes due;
provided, that if the full amount of the money payable has not been received by
the Paying Agent on or before the due date, it shall mean the date on which, the
full amount of the money having been so received, notice to that effect shall
have been duly given to the Noteholders by the Company in accordance with
Condition 15.

     "Rule 144A" means Rule 144A, as amended, promulgated by the Commission
pursuant to the Securities Act.

     "Rule 144" means Rule 144, as amended, promulgated by the Commission
pursuant to the Securities Act.

     "Securities Act" means the Securities Act of 1933, as amended, and the
rules and regulations promulgated from time to time by the Commission pursuant
thereto.

     "Shares" means the common stock, par value U.S. $0.01, of the Company (and
all other (if any) shares or stock resulting from any sub-division,
consolidation or reclassification of such shares).

          "Special Record Date" means the date established by the Paying Agent
as provided herein as a record date for the payment of defaulted principal of or
interest on the Notes.

          "Stated Maturity," when used with respect to any Indebtedness or any
installment of principal thereof or interest thereon, means the date specified
in such Indebtedness as the fixed date on which the principal of such
Indebtedness or such installment of principal or interest is due and payable.

f-FTW_186041_4_.doc                                                           34

<PAGE>

     "Stock Exchange" means any United States national or regional stock
exchange or quotation service such as NASDAQ National Market System or any
similar quotation service maintained by the National Quotation Bureau or any
successor thereto.

     "Stock Exchange Business Day" means any day (other than a Saturday or
Sunday) on which the a Stock Exchange is open for business.

     "Subordinated Obligation" means any Indebtedness of the Company outstanding
on such date which is contractually subordinate or junior in right of payment to
the Notes.

     "Subsidiary" of any Person means any Corporation of which at least a
majority of the shares of stock having by the terms thereof ordinary voting
power to elect a majority of the Board of Directors of such Corporation
(irrespective of whether or not at the time stock of any other class or classes
of such Corporation shall have or might have voting power by reason of the
happening of any contingency) is directly or indirectly owned or controlled by
the Person.

     "U.S. Government Obligations" means securities that are (x) direct
obligations of the United States of America for the timely payment of which its
full faith and credit is pledged or (y) obligations of a Person controlled or
supervised by and acting as an agency or instrumentality of the United States of
America the timely payment of which is unconditionally guaranteed as a full
faith and credit obligation by the United States of America, which, in either
case, are not callable or redeemable at the option of the issuer thereof, and
shall also include a depository receipt issued by a bank (as defined in Section
3(a)(2) of the Securities Act), as custodian with respect to any such U.S.
Government Obligation or a specific payment of principal of or interest on any
such U.S. Government Obligation held by such custodian for the account of the
holder of such depository receipt, provided that (except as required by law)
such custodian is not authorized to make any deduction from the amount payable
to the holder of such depository receipt from any amount received by the
custodian in respect of the U.S. Government Obligation or the specific payment
of principal of or interest on the U.S. Government Obligation evidenced by such
depository receipt.

     The Paying Agent and Conversion Agent is:

     The Bank of New York
     Attention:  Global Finance Unit
     101 Barclay, Floor 21W
     New York, New York 10286

f-FTW_186041_4_.doc                                                           35

<PAGE>

                                   SCHEDULE A

                      Principal Amount of this Global Note

          The aggregate principal amount of this Global Note is as shown by the
latest entry made by or on behalf of the Paying Agent in the fourth column
below. Reductions in the outstanding principal amount of this Global Note
following redemption, conversion into shares of Common Stock, or the purchase
and cancellation of Notes are entered in the second and third columns below.

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------
                      Reasons for change                         Outstanding
                              in                                   principal          Notation made by or on
                        The outstanding                         Amount of this       Behalf of the Paying Agent
                     Principal amount of                            Global                  (other than
                           Global             Amount of      Note following such     In respect of the initial
    Date                    Note             Such change           Change                Principal amount
----------------------------------------------------------------------------------------------------------------
<S>                <C>                      <C>              <C>                    <C>
..   , 2003         Not applicable           Not applicable                          Not applicable
----------------------------------------------------------------------------------------------------------------

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

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

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

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

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

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

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

----------------------------------------------------------------------------------------------------------------
</TABLE>

f-FTW_186041_4_.doc                                                           36

<PAGE>

                                   SCHEDULE B

                Interest Payments in respect of this Global Note

The following payments of interest in respect of this Global Note have been
made:
<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------
               Amounts of interest                             Notation made by and on behalf of the
   Date made     Due and payable     Amount of interest paid             Paying Agent
----------------------------------------------------------------------------------------------------
<S>            <C>                   <C>                       <C>

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

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

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

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

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

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

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

----------------------------------------------------------------------------------------------------
</TABLE>

f-FTW_186041_4_.doc                                                           37

<PAGE>

                                    EXHIBIT A
                                    ---------

                           HOLDER'S CONVERSION NOTICE

To:  [Conversion Agent]

     The undersigned Holder of the 7% Senior Convertible Notes Due 2007, Series
F (the "Notes") in the aggregate principal amount of U.S. $_____________
tendered herewith hereby irrevocably exercises the option to convert such
Note(s) into shares of Common Stock in accordance with the Terms and Conditions
of the Notes relating to the issuance by Harken Energy Corporation of an
aggregate of U.S. $720,000 of the Notes and directs that the Conversion Shares
issuable and deliverable upon such conversion be issued and delivered to the
undersigned in the name and at the address set forth below.

     If the Conversion Shares are to be issued in the name of a Person other
than the undersigned, the undersigned will pay all transfer taxes payable with
respect thereto and is delivering herewith a certificate in proper form
certifying that the applicable restrictions on transfer have been complied with.

     All terms used and not otherwise defined herein have the respective
meanings set forth in the Terms and Conditions.

     DATE:
          --------------------

                                             ----------------------------------
                                             Name of Holder

                                             ----------------------------------
                                             Signature(s) of Holder

Address for Delivery
of Share Certificates
                                             ----------------------------------

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

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

Name for Registration
of Share Certificates (if
Different than Holder):

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

f-174662.1                            A-1

<PAGE>

                                    EXHIBIT B
                                    ---------

                           COMPANY'S CONVERSION NOTICE

To:  Conversion Agent

     Harken Energy Corporation (the "Company") hereby irrevocably exercises the
option to convert all of the 7% Senior Convertible Notes Due 2007, Series F (the
"Notes") of the Company that have not been previously converted and are
Outstanding at the date of this notice into shares of its Common Stock, in
accordance with the Terms and Conditions, pursuant to which the Company has
issued an aggregate of U.S. $720,000 of the Notes, and confirms that the
Conversion Shares issuable and deliverable upon conversion shall be issued and
delivered to the Noteholders in accordance with the instructions for
registration and delivery of the Conversion Shares to each Holder, to be
provided by each Holder to the Conversion Agent.

     The Company is entitled to exercise its option to convert because (i)
ninety (90) days has elapsed from the Effective Date, (ii) the average of the
Market Price of the Common Stock over the Stock Exchange Business Days during
the thirty (30) consecutive calendar day period beginning on ________________
and ending on ____________ (being a date after the Effective Date) equaled or
exceeded 125% of the Conversion Price, and (iii) the Conversion Shares were
Freely Tradeable on the date such threshold was met and for the 30 calendar day
period after such date.

     All terms used and not otherwise defined herein shall have the respective
meanings set forth in the Terms and Conditions.

DATE:                                        HARKEN ENERGY CORPORATION
     ------------------------

                                                  By:
                                                     ---------------------------
                                                  Name:
                                                       -------------------------
                                                  Title:
                                                        ------------------------

f-174662.1                            B-1

<PAGE>

                                    EXHIBIT C
                                    ---------

                    COMPANY'S NOTICE OF REDEMPTION FOR SHARES

To:  [Paying and Conversion Agent]

     Harken Energy Corporation (the "Company") hereby irrevocably exercises the
option to convert _______ United States dollars (U.S. $_______ ) principal
amount of the 7% Senior Convertible Notes Due 2007, Series F (the "Notes") of
the Company that have not been previously converted and are Outstanding at the
date of this notice into shares of its Common Stock, in accordance with the
Terms and Conditions, pursuant to which the Company has issued an aggregate of
U.S. $720,000 of the Notes, and confirms that the Conversion Shares issuable and
deliverable upon conversion shall be issued and delivered to the Noteholders in
accordance with the instructions for registration and delivery of the Conversion
Shares to each Holder, to be provided by each Holder to the Conversion Agent.

     Each Note so redeemed will be redeemed for the number of Shares of Common
Stock equal to 110% of the face value of the Note plus interest accrued and
unpaid thereon divided by US $_______________ , which represents the average of
the Market Price of the Common Stock over the 30 Stock Exchange Days day period
immediately preceding the pricing date.

     All terms used and not otherwise defined herein shall have the respective
meanings set forth in the Terms and Conditions.

DATE:                                        HARKEN ENERGY CORPORATION
     --------------------

                                             By:
                                                --------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------

                                      C-1<PAGE>

                                                                   Exhibit 10.50
                                                                  Execution Copy

================================================================================

                            HARKEN ENERGY CORPORATION

                                   $2,020,000

                  Increasing Rate Senior Secured Notes Due 2008

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

                             NOTE PURCHASE AGREEMENT

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

                               Dated May 26, 2003

================================================================================

<PAGE>

                            HARKEN ENERGY CORPORATION

                     580 WestLake Park Boulevard, Suite 600
                              Houston, Texas 77079

              Increasing Rate Senior Secured Notes due May 26, 2008

                                                                    May 26, 2003

TO EACH OF THE NOTEHOLDERS LISTED IN
       THE ATTACHED SCHEDULE A:

Ladies and Gentlemen:

          Harken Energy Corporation, a Delaware corporation (the "Company"),
agrees with you as follows:

1.     AUTHORIZATION OF NOTES.

          The Company will authorize the issue and sale of $2,020,000 aggregate
principal amount of its Increasing Rate Senior Secured Notes due May 26, 2008
(the "Notes", such term to include any such notes issued in substitution
therefor pursuant to Section 13 of this Agreement). The Notes shall be
substantially in the form set out in Exhibit 1, with such changes therefrom, if
any, as may be approved in writing by you and the Company. Certain capitalized
terms used in this Agreement are defined in Schedule B; references to a
"Schedule" or an "Exhibit" are, unless otherwise specified, to a Schedule or an
Exhibit attached to this Agreement.

2.     SALE AND PURCHASE OF NOTES; TERMS OF NOTES; GRANTING OF LIENS.

          (a)  Subject to the terms and conditions of this Agreement, the
Company will issue and sell to you, and you will purchase from the Company, at
the Closing provided for in Section 3, Notes in the principal amount specified
opposite your name in Schedule A at the purchase price of 100% of the principal
amount thereof, to be paid in the form of Harken Energy Corporation 5% Senior
Convertible Notes due 2003 (the "5% Notes") having a principal face amount equal
to the Notes you are acquiring at the Closing. The Company and you agree that
for purposes of consideration hereunder (and all parties agree that full
consideration is being given hereunder) and for federal income tax purposes, the
5% Notes will have a fair market value equal to the amount specified opposite
your name in Schedule A. Unless otherwise required by applicable law, neither
the Company nor you shall take any position contrary to such treatment for any
income or other tax purposes.

                                      -1-

<PAGE>

          (b)  [Reserved]

          (c)  No Notes shall be issued by the Company to any Person other than
you or your designee or assignee communicated in writing to the Company.

          (d)  The date on which the principal amount of the Notes is due and
payable shall be May 26, 2008 (the "Notes Stated Maturity"), and the Notes shall
have the rights provided herein and therein and shall bear interest at the rates
per annum specified therein from the Closing Date or from the most recent
Interest Payment Date to which interest has been paid, payable in arrears, and
thereafter as provided in the Notes and at the Notes Stated Maturity, until the
principal thereof is paid in full.

          (e)  The principal of and interest on the Notes shall be payable at
the office or agency of the Company maintained for such purpose in 580 WestLake
Park Blvd., Suite 600, Houston, Texas 77079, or at such other office or agency
of the Company as may be maintained for such purpose. Interest on the Notes
shall be computed on the basis of a 360-day year of twelve 30-day months and, in
the case of an incomplete month, the number of days elapsed.

          (f)  The Company's obligations under the Notes and hereunder do and
will rank at all times at least pari passu with all other present and future
Indebtedness of the Company, subject to the provisions of Section 9.2 and
excluding the Senior Debt, and shall be superior in rank to all existing and
future Subordinated Obligations. The Company covenants and agrees that, except
with respect to any Lien permitted by this Agreement, the Indebtedness
represented by the Notes and the payment of the principal of and interest on
each and all of the Notes are hereby expressly made pari passu to all other
present and future Indebtedness other than all Subordinated Obligations, in
respect of which the payment of principal of and interest on each and all of the
Notes is senior, and the Senior Debt, in respect of which the payment of
principal of and interest on each and all of the Notes is subordinate.

          (g)  On May 27, 2003 or one (1) Business Day following the Closing,
the Company shall pay to you in full in immediately available lawful money of
the United States of America all then accrued and unpaid interest owing on the
5% Notes acquired from you by the Company pursuant to this Agreement or that you
continue to hold; provided, however, that the payment of such interest shall be
effected in accordance with the Indenture.

          (h)  Contemporaneously with entering into this Agreement, the Company
is entering into separate Note Purchase Agreements (the "Other Agreements")
identical with this Agreement with each of the other Noteholders named in
Schedule A (the "Other Noteholders"), providing for the sale at such Closing to
each of the Other Noteholders of Notes in the principal amount specified
opposite its name in Schedule A. Your obligation hereunder and the obligations
of the Other Noteholders under the Other Agreements are several and not joint
obligations and you shall have no obligation under any Other Agreement and no
liability to any Person for the performance or non-performance by any Other
Noteholders thereunder.

                                      -2-

<PAGE>

3.     CLOSING.

          The sale and purchase of the Notes to be purchased by you and the
Other Noteholders pursuant to Section 2(a) shall occur at the offices of Harken
Energy Corporation, 580 WestLake Park Boulevard, Suite 600, Houston, Texas at
9:00 a.m., Central time, at a closing (the "Closing") on May 27, 2003. At the
Closing the Company will deliver to you the Notes to be purchased by you in the
form of a single Note (or such greater number of Notes in denominations of at
least $10,000 as you may request) dated the date of the Closing and registered
in your name (or in the name of your nominee), against delivery by you to the
Company of either (i) the 5% Notes being acquired from you by the Company at the
Closing or (ii) evidence reasonably satisfactory to the Company that electronic
delivery of such 5% Notes has been initiated. If at the Closing the Company
shall fail to tender such Notes to you as provided above in this Section 3, or
any of the conditions specified in Section 4 shall not have been fulfilled to
the your satisfaction, you shall, at your election, be relieved of all further
obligations under this Agreement, without thereby waiving any rights you may
have by reason of such failure or such nonfulfillment.

4.     CONDITIONS TO CLOSING.

          Your obligation to purchase and pay for the Notes to be sold to you at
the Closing is subject to the fulfillment to your satisfaction, prior to or at
the Closing, of the following conditions:

4.1.   Representations and Warranties.

          The representations and warranties of the Company in this Agreement
shall be correct when made and at the time of the Closing.

4.2.   Performance; No Default.

          The Company shall have performed and complied with all agreements and
conditions contained in this Agreement required to be performed or complied with
by it prior to or at the Closing and after giving effect to the issue and sale
of the Notes no Default or Event of Default shall have occurred and be
continuing.

4.3.   Compliance Certificates.

          (a)  Officer's Certificate. The Company shall have delivered to you an
Officer's Certificate, dated the date of the Closing, certifying that the
conditions specified in Sections 4.1 and 4.2 have been fulfilled.

          (b)  Secretary's Certificate. The Company shall have delivered to you
a certificate certifying (i) that no approval of the Board of Directors is
required, under applicable corporate law and the Company's charter and bylaws,
to execute and deliver this Agreement, Notes and related documents; (ii) that
the Company shall use its best efforts to obtain ratification by the Board of
Directors of the execution and delivery of this Agreement, Notes and related

                                      -3-

<PAGE>

documents; and (iii) the Company is authorized under its bylaws and charter to
deliver and be bound by facsimile or electronic signatures.

4.4.   Opinions of Counsel.

          You shall have received opinions in form and substance satisfactory to
you, dated the date of the Closing from Elmer Johnston, counsel for the Company,
covering the matters set forth in Exhibit 4.4 and covering such other matters
incident to the transactions contemplated hereby as you or your special counsel
may reasonably request (and the Company hereby instructs its counsel to deliver
such opinion to you).

4.5.   Payment of Counsel Fees.

          Without limiting the provisions of Section 15.1, the Company shall
have paid on the day of the Closing or one (1) Business Day following the
Closing the fees, charges and disbursements of Andrews & Kurth L.L.P. to the
extent reflected in a statement of such counsel rendered to the Company on the
day of the Closing, such fees, charges and disbursements shall not exceed
$20,000. Such payment shall be delivered to Andrews & Kurth L.L.P. at 600 Travis
Street, Suite 4200, Houston, Texas, 77002, Attention: Tri Nguyen.

4.6.   Proceedings and Documents.

          All corporate and other proceedings in connection with the
transactions contemplated by this Agreement and all documents and instruments
incident to such transactions shall be satisfactory to you and your special
counsel, and you and your special counsel shall have received all such
counterpart originals or certified or other copies of such documents as you or
they may reasonably request.

4.7.   Sale of Other Notes.

          Contemporaneously with the Closing the Company shall sell to the Other
Noteholders and the Other Noteholders shall purchase the Notes to be purchased
by them at the Closing as specified in Schedule A.

5.     REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

          The Company represents and warrants to you that:

5.1.   Organization; Power and Authority.

          The Company is a corporation duly organized, validly existing and in
good standing under the laws of its jurisdiction of incorporation, and is duly
qualified as a foreign corporation and is in good standing in each jurisdiction
in which such qualification is required by law, other than those jurisdictions
as to which the failure to be so qualified or in good standing could not,
individually or in the aggregate, reasonably be expected to have a Material
Adverse Effect. The Company has the corporate power and authority to execute and
deliver this Agreement and the Notes and to perform the provisions hereof and
thereof.

                                      -4-

<PAGE>

5.2.   Authorization, etc.

          This Agreement and the Notes have been duly authorized by all
necessary corporate action on the part of the Company, and this Agreement
constitutes, and upon execution and delivery thereof each Note will constitute,
a legal, valid and binding obligation of the Company enforceable against the
Company in accordance with its terms, except as such enforceability may be
limited by (i) applicable bankruptcy, insolvency, reorganization, moratorium or
other similar laws affecting the enforcement of creditors' rights generally and
(ii) general principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law).

5.3.   Disclosure.

          This Agreement, the documents, certificates or other writings
delivered to you and the Other Noteholders by or on behalf of the Company in
connection with the transactions contemplated hereby and the financial
statements listed in Schedule 5.3, taken as a whole, do not contain any untrue
statement of a material fact or omit to state any material fact necessary to
make the statements therein not misleading in light of the circumstances under
which they were made. Except as described in Schedule 5.3, or in one of the
documents, certificates or other writings identified therein, or in the
financial statements listed in Schedule 5.3, since May 14, 2003, there has been
no change in the financial condition, operations, business, properties or
prospects of the Company or any Subsidiary except changes that individually or
in the aggregate could not reasonably be expected to have a Material Adverse
Effect. There is no fact known to the Company that could reasonably be expected
to have a Material Adverse Effect that has not been set forth herein or in the
other documents, certificates and other writings delivered to you or any Other
Noteholder by or on behalf of the Company specifically for use in connection
with the transactions contemplated hereby.

5.4.   Governmental Authorizations, etc.

          No consent, approval or authorization of, or registration, filing or
declaration with, any Governmental Authority is required in connection with the
execution, delivery or performance by the Company of this Agreement or the Notes
or the issuance of the Notes.

6.     REPRESENTATIONS OF THE NOTEHOLDER.

          You represent that you are purchasing the Notes for your own account
or for one or more separate accounts maintained by you and not with a view to
the distribution thereof, provided that the disposition of your property shall
at all times be within your control. You understand that the Notes have not been
registered under the Securities Act and may be resold only if registered
pursuant to the provisions of the Securities Act or if an exemption from
registration is available, except under circumstances where neither such
registration nor such an exemption is required by law, and that the Company is
not required to register the Notes.

7.     INFORMATION AS TO THE COMPANY.

7.1.   Financial and Business Information.

                                      -5-

<PAGE>

          The Company shall deliver to you:

          (a)  Quarterly Statements -- within 60 days after the end of each
quarterly fiscal period in each fiscal year of the Company (other than the last
quarterly fiscal period of each such fiscal year), duplicate copies of,

          (i)  a consolidated balance sheet of the Company and its Subsidiaries
     as at the end of such quarter, and

          (ii) consolidated statements of income, changes in shareholders'
     equity and cash flows of the Company and its Subsidiaries, for such quarter
     and (in the case of the second and third quarters) for the portion of the
     fiscal year ending with such quarter,

setting forth in each case in comparative form the figures for the corresponding
periods in the previous fiscal year, all in reasonable detail, prepared in
accordance with GAAP applicable to quarterly financial statements generally, and
certified by a Senior Financial Officer as fairly presenting, in all material
respects, the financial position of the companies being reported on and their
results of operations and cash flows, subject to changes resulting from year-end
adjustments, provided that the filing of the Company's Quarterly Report on Form
10-Q prepared in compliance with the requirements therefor and filed with the
Securities and Exchange Commission shall be deemed to satisfy the requirements
of this Section 7.1(a);

          (b)  Annual Statements -- within 105 days after the end of each fiscal
year of the Company, duplicate copies of,

          (i)  a consolidated balance sheet of the Company and its
     Subsidiaries, as at the end of such year, and

          (ii) consolidated statements of income, changes in shareholders'
     equity and cash flows of the Company and its Subsidiaries, for such year,

setting forth in each case in comparative form the figures for the previous
fiscal year, all in reasonable detail, prepared in accordance with GAAP, and
accompanied

          (A)  by an opinion thereon of independent certified public accountants
of recognized national standing, which opinion shall state that such financial
statements present fairly, in all material respects, the financial position of
the companies being reported upon and their results of operations and cash flows
and have been prepared in conformity with GAAP, and that the examination of such
accountants in connection with such financial statements has been made in
accordance with generally accepted auditing standards, and that such audit
provides a reasonable basis for such opinion in the circumstances, and

          (B)  a certificate of such accountants stating that they have reviewed
this Agreement and stating further whether, in making their audit, they have
become aware of any condition or event that then constitutes a Default or an
Event of Default, and, if they are aware that any such condition or event then
exists, specifying the nature and period of the existence thereof (it being
understood that such accountants shall not be liable, directly or indirectly,
for

                                      -6-

<PAGE>

any failure to obtain knowledge of any Default or Event of Default unless such
accountants should have obtained knowledge thereof in making an audit in
accordance with generally accepted auditing standards or did not make such an
audit),

provided that the filing of the Company's Annual Report on Form 10-K for such
fiscal year (together with the Company's annual report to shareholders, if any,
prepared pursuant to Rule 14a-3 under the Exchange Act) prepared in accordance
with the requirements therefor and filed with the Securities and Exchange
Commission, together with the accountant's certificate described in clause (B)
above, shall be deemed to satisfy the requirements of this Section 7.1(b);

          (c)  Notice of Default or Event of Default -- promptly, and in any
event within ten days after a Responsible Officer becoming aware of the
existence of any Default or Event of Default or that any Person has given any
notice or taken any action with respect to a claimed default hereunder, a
written notice specifying the nature and period of existence thereof and what
action the Company is taking or proposes to take with respect thereto.

8.     PREPAYMENT/CONVERSION OF THE NOTES.

8.1.   Optional Prepayments.

          (a)  After the Closing Date and until April 26, 2008, the Company may,
at its option, upon notice as provided below, redeem all, but not part, of the
Notes outstanding by paying to the holders of the Notes the principal amounts
provided in Section 8.1(b) plus all accrued and unpaid interest on the Notes up
to the date of payment and any other amounts owing hereunder (the "Prepayment
Amount").

          (b)  If the prepayment option provided in this Section 8.1 is
exercised and consummated following the:

          (i)   Closing Date but on or before the one (1) year anniversary of
     the Closing Date, the Company shall pay to the holders of the Notes an
     amount equal to eight-two percent (82%) of the nominal value of the then
     outstanding Notes;

          (ii)  one (1) year anniversary of the Closing Date but on or before
     the two (2) year anniversary of the Closing Date, the Company shall pay to
     the holders of the Notes an amount equal to eight-five percent (85%) of the
     nominal value of the then outstanding Notes;

          (iii) two (2) year anniversary of the Closing Date but on or before
     the three (3) year anniversary of the Closing Date, the Company shall pay
     to the holders of the Notes an amount equal to eighty-eight percent (88%)
     of the nominal value of the then outstanding Notes;

          (iv)  three (3) year anniversary of the Closing Date but on or before
     the four (4) year anniversary of the Closing Date, the Company shall pay to
     the holders of the Notes an amount equal to ninety-one percent (91%) of the
     nominal value of the then outstanding Notes; and

                                      -7-

<PAGE>

          (v)   four (4) year anniversary of the Closing Date but prior to the
     Notes Stated Maturity, the Company shall pay to the holders of the Notes an
     amount equal to one-hundred percent (100%) of the nominal value of the then
     outstanding Notes.

          (c)  The Company will give you and the holders of a Note written
notice of its election to exercise this Section 8.1 option not less than 30 days
and not more than 60 days prior to the date fixed for such prepayment (the
"Prepayment Date"). Each such notice shall specify the Prepayment Date and the
Prepayment Amount, broken out to show the aggregate principal, interest and
other amounts owing hereunder to be paid on the Prepayment Date.

          (d)  The Prepayment Amount shall be due and payable by the Company to
the holders of the Notes on the Prepayment Date and shall either be paid (i) in
full in cash in immediately available funds to the account designated on
Schedule A hereto, or, at the Company's option which must be exercised in the
notice referred to in Section 8.1 above or it is waived, (ii) by the (x) payment
in full in cash in immediately available funds to the account designated on
Schedule A hereto of an amount equal to the sum of (1) eight-seven and one-half
percent (871/2%) of the principal portion of the Prepayment Amount and (2) one
hundred percent (100%) of the interest and other amounts comprising the
Prepayment Amount and (y) the satisfaction of the remaining twelve and one-half
percent (121/2%) of the principal portion of the Prepayment Amount (the
"Prepayment Amount Remainder") by the issuance by the Company to the holders of
the Notes of a number of Freely Tradeable Shares determined by dividing the
product of the Prepayment Amount Remainder and 1.125 by the Conversion Price.
Examples of the foregoing calculations are set forth on Exhibit 2.

8.2.   Maturity; Surrender, etc.

          In the case of prepayment of Notes pursuant to this Section 8, the
Notes shall, on the Prepayment Date, mature and become due and payable in the
principal amount specified in Section 8.1(b) above, together with interest on
the full principal amount of the Notes accrued to such date and any other
amounts owing hereunder. From and after the Prepayment Date, unless the Company
shall fail to pay such principal amount when so due and payable, together with
the interest and other amounts, if any, as aforesaid, interest on the Notes
shall cease to accrue. Once the Notes have been paid or so prepaid in full, the
same shall be surrendered to the Company and cancelled and shall not be
reissued, and no Note shall be issued in lieu of any prepaid principal amount of
any Note.

                                      -8-

<PAGE>

9.     AFFIRMATIVE COVENANTS.

9.1.   Incorporation of Indenture Covenants.

          The Covenants set forth in Article 10 of the Indenture (except for the
covenants and other provisions set forth in Sections 10.02, 10.03, 10.09, 10.10,
10.11, 10.12, 10.15, 10.16 and 10.17) are hereby incorporated by reference;
provided, however, that the defined terms utilized in the incorporated
provisions shall have the meanings ascribed thereto in Schedule B hereto and
each reference therein to "Trustee" shall mean "the holders of the Notes", and
to "Principal Subsidiaries" shall mean "Subsidiaries", and to "Indenture" shall
mean "this Agreement" and to "Article 8" shall mean Section 10 hereof. Further,
each reference to Couponholders and Paying Agents shall be disregarded; the
phrase "Article Eight" in Section 10.04 of the Indenture shall be deemed to mean
Section 10 of this Agreement; the phrase "Article Eight or Section 10.11" in
Section 10.06 of the Indenture shall be deemed to mean Sections 10 and 9.4,
respectively, of this Agreement; the phrase the "Trustee at its Corporate Trust
Office" in Section 10.08 shall be deemed to mean the "holders of the Notes at
the addresses for notices provided under Section 18 of this Agreement"; and the
word "Commission" in the first sentence of Section 10.09 of the Indenture shall
be deemed to mean "holders of the Notes".

9.2.   Granting of Collateral; Further Assurances.

          On or prior to the first Anniversary of the Closing Date, the Company
shall, for purposes of securing the Company's payment and performance
obligations under this Agreement, the Other Agreements and the Notes, grant,
and, if applicable, shall cause its Subsidiaries to grant, to each holder of a
Note, ratably and on a pari passu basis, first priority liens on, and security
interests in, marketable securities or other property acceptable to you and the
other holders of Notes and having a value (agreed by you and the other holders
of Notes) that is equal to or greater than, during the period from the first
anniversary of the Closing Date to the second Anniversary of the Closing Date,
60% of the principal amount of the Notes then outstanding and, during the period
following the second anniversary of the Closing Date and ending on the date on
which the principal and interest on the Notes has been fully paid, 100% of the
principal amount of the Notes then outstanding. The Company shall take, and
shall, if applicable, cause its Subsidiaries to take, all steps, including the
preparation, execution, delivery and recordation of documents and instruments in
form and substance satisfactory to you and the other holders of Notes, necessary
to ensure that the liens on and security interests in the subject collateral in
favor of each holder of a Note are valid, enforceable and perfected and, unless
otherwise agreed by you and the other holders of Notes, first priority Liens.
The Company shall deliver any other documents, agreements, certificates and
legal opinions requested by you in connection with the creation, perfection,
priority and maintenance of such Liens.

9.3.   Limitation on Indebtedness; Negative Pledge.

          (a)  Neither the Company nor any Subsidiary will create, incur,
assume, guarantee or in any other manner become directly or indirectly liable
for the payment of any Indebtedness that is senior (whether by agreement, by
operation of law, or structurally by virtue of the identity of the obligor) in
right of payment to the Notes; provided, however, that the Company and/or a
Subsidiary may incur and become liable with respect to Indebtedness which is
senior in right of

                                      -9-

<PAGE>

payment to the Notes provided (i) such Indebtedness is incurred in connection
with purchase money obligations in respect of any Property or assets purchased
after the Closing Date or to pay all or a portion of the purchase price of
Property or assets acquired by the Company and/or by a Subsidiary after the
Closing Date, (ii) if the Company and/or a Subsidiary shall grant a security
interest in existing Property or assets, the Company shall, beginning on the
date that is 180 days following the Closing Date, and thereafter, maintain a
negative pledge in favor of the holders of the Notes covering other Property and
assets which are not subject to any security interest senior in right of payment
to the Notes with an asset value coverage ratio, being the quotient of (a) the
fair market value of the assets covered by the negative pledge to (b) the
aggregate principal amount of the Notes then outstanding, equal to or greater
than 1.5 to 1.0, or (iii) if such Indebtedness is incurred in connection with
project finance transactions by the Company and/or a Subsidiary, such
Indebtedness will be recourse only to the project and/or project assets so
encumbered, except to the extent a corporate guarantee by the Company and/or a
Subsidiary may be required in connection therewith. All such Indebtedness as
contemplated under provisos (i), (ii), and (iii) above to the extent it ranks
senior to the Notes shall rank senior to the Notes only as to payment from the
assets or Property encumbered and shall rank pari passu to the Notes for all
other purposes.

9.4.   Limitation on Liens.

          The Company will not, and will not permit any of its Subsidiaries to,
create, incur, assume or suffer to exist, any Lien of any kind securing any
Indebtedness (excluding Senior Debt) that is senior to (whether by agreement, by
operation of law, or structurally by virtue of the identity of the obligor) the
Notes (including any assumption, guarantee or other liability with respect
thereto by any of its Subsidiaries) upon any properties of the Company or any of
its Subsidiaries, unless the Notes are equally and ratably secured or rank prior
to the Indebtedness secured by such Lien; provided, however, that such Liens may
be incurred if the Indebtedness secured by such Lien is contractually
subordinated to the Indebtedness represented by the Notes in a manner
satisfactory to you and the other holders of Notes, and except that Liens may be
incurred securing Indebtedness which is senior Indebtedness permitted under the
provisos set forth in Section 9.3 (provided that the property encumbered by the
Lien is limited to Senior Debt or, in the case of proviso (iii), the project
and/or project assets and to, in the case of proviso (i), the property acquired
by the Company and/or by a Subsidiary with the proceeds of the subject
Indebtedness).

10.    MERGER, CONSOLIDATION, ETC.

          The Company shall not consolidate with or merge with any other
corporation or convey, transfer or lease substantially all of its assets in a
single transaction or series of transactions to any Person unless:

          (a)  the successor formed by such consolidation or the survivor of
such merger or the Person that acquires by conveyance, transfer or lease
substantially all of the assets of the Company as an entirety, as the case may
be, shall be a solvent corporation organized and existing under the laws of the
United States or any State thereof (including the District of Columbia), and, if
the Company is not such corporation, (i) such corporation shall have executed
and delivered to you its assumption of the due and punctual performance and
observance of each covenant and

                                      -10-

<PAGE>

condition of this Agreement and the Notes and (ii) shall have caused to be
delivered to you an opinion of nationally recognized independent counsel, or
other independent counsel reasonably satisfactory to you, to the effect that all
agreements or instruments effecting such assumption are enforceable in
accordance with their terms and comply with the terms hereof; and

          (b)  immediately after giving effect to such transaction, no Default
or Event of Default shall have occurred and be continuing.

No such conveyance, transfer or lease of substantially all of the assets of the
Company shall have the effect of releasing the Company or any successor
corporation that shall theretofore have become such in the manner prescribed in
this Section 10 from its liability under this Agreement or the Notes.

11.    EVENTS OF DEFAULT.

          "Event of Default", whenever used herein, has (unless otherwise
indicated) the meaning ascribed thereto in Section 5.01 of the Indenture, which
Section 5.01 is hereby incorporated by reference; provided, however, that the
defined terms utilized in such incorporated provisions shall have the meanings
ascribed thereto in Schedule B hereto; the phrase "occasioned by the provisions
of Article Fourteen or be" in the preamble to Section 5.01 of the Indenture is
deleted and each reference therein to "Trustee" shall mean "the holders of the
Notes", and to "Principal Subsidiaries" shall mean "Subsidiaries", and to
"Indenture" shall mean this "Agreement". Further the Senior Debt and the
Subordinated Obligations and all related documents and instruments shall be
deemed added to the cross-default provisions of Section 5.01(b) of the Indenture
as incorporated herein by reference.

12.    REMEDIES ON DEFAULT, ETC.

12.1.  Acceleration.

          (a)  If an Event of Default with respect to the Company described in
paragraph 5.01(f) or 5.01(g) of the Indenture, as incorporated herein by
reference pursuant to Section 11 hereof, has occurred, all the Notes then
outstanding shall automatically become immediately due and payable.

          (b)  If any other Event of Default has occurred and is continuing, any
holder or holders of more than 25% in principal amount of the Notes at the time
outstanding may at any time at its or their option, by notice or notices to the
Company, declare all the Notes then outstanding to be immediately due and
payable.

          Upon any Notes becoming due and payable under this Section 12.1,
whether automatically or by declaration, such Notes will forthwith mature and
the entire unpaid principal amount of such Notes, plus all accrued and unpaid
interest thereon and any other amounts owing hereunder, shall all be immediately
due and payable, in each and every case without presentment, demand, protest or
further notice, all of which are hereby waived. The Company acknowledges, and
the parties hereto agree, that each holder of a Note has the right to maintain
its investment in the Notes free from repayment by the Company (except as
specifically provided for herein).

                                      -11-

<PAGE>

12.2.  Other Remedies.

          If any Default or Event of Default has occurred and is continuing, and
irrespective of whether any Notes have become or have been declared immediately
due and payable under Section 12.1, the holder of any Note may proceed to
protect and enforce its rights by an action at law, suit in equity or other
appropriate proceeding, whether for the specific performance of any agreement
contained herein or in any Note, or for an injunction against a violation of any
of the terms hereof or thereof, or in aid of the exercise of any power granted
hereby or thereby or by law or otherwise.

12.3.  Rescission.

          At any time after any Notes have been declared due and payable
pursuant to clause (b) of Section 12.1, the holders of not less than 76% in
principal amount of the Notes then outstanding, by written notice to the
Company, may rescind and annul any such declaration and its consequences if (a)
the Company has paid all overdue interest on the Notes, all principal of any
Notes that are due and payable and are unpaid other than by reason of such
declaration, and all interest on such overdue principal and (to the extent
permitted by applicable law) any overdue interest in respect of the Notes, at
the Default Rate, (b) all Events of Default and Defaults, other than non-payment
of amounts that have become due solely by reason of such declaration, have been
cured or have been waived pursuant to Section 17, and (c) no judgment or decree
has been entered for the payment of any monies due pursuant hereto or to the
Notes. No rescission and annulment under this Section 12.3 will extend to or
affect any subsequent Event of Default or Default or impair any right consequent
thereon.

12.4.  No Waivers or Election of Remedies, Expenses, etc.

          No course of dealing and no delay on the part of the holder of any
Note in exercising any right, power or remedy shall operate as a waiver thereof
or otherwise prejudice such holder's rights, powers or remedies. No right, power
or remedy conferred by this Agreement or by any Note upon any holder thereof
shall be exclusive of any other right, power or remedy referred to herein or
therein or now or hereafter available at law, in equity, by statute or
otherwise. Without limiting the obligations of the Company under Section 15, the
Company will pay to the holder of each Note on demand such further amount as
shall be sufficient to cover all costs and expenses of such holder incurred in
any enforcement or collection under this Section 12, including, without
limitation, reasonable attorneys' fees, expenses and disbursements.

13.    REGISTRATION; EXCHANGE; SUBSTITUTION OF NOTES.

13.1.  Registration of Notes.

          The Company shall keep at its principal executive office a register
for the registration and registration of transfers of Notes. The name and
address of each holder of one or more Notes, each transfer thereof and the name
and address of each transferee of one or more Notes shall be registered in such
register. Prior to due presentment for registration of transfer, the Person in
whose name any Note shall be registered shall be deemed and treated as the owner

                                      -12-

<PAGE>

and holder thereof for all purposes hereof, and the Company shall not be
affected by any notice or knowledge to the contrary. The Company shall give to
any holder of a Note that is an Institutional Investor promptly upon request
therefore, a complete and correct copy of the names and addresses of all
registered holders of Notes.

13.2.  Transfer and Exchange of Notes.

          Upon surrender of any Note at the principal executive office of the
Company for registration of transfer or exchange (and in the case of a surrender
for registration of transfer, duly endorsed or accompanied by a written
instrument of transfer duly executed by the registered holder of such Note or
his attorney duly authorized in writing and accompanied by the address for
notices of each transferee of such Note or part thereof), the Company shall
execute and deliver, at the Company's expense (except as provided below), one or
more new Notes (as requested by the holder thereof) in exchange therefore, in an
aggregate principal amount equal to the unpaid principal amount of the
surrendered Note. Each such new Note shall be payable to such Person as such
holder may request and shall be substantially in the form of Exhibit 1. Each
such new Note shall be dated and bear interest from the date to which interest
shall have been paid on the surrendered Note or dated the date of the
surrendered Note if no interest shall have been paid thereon. The Company may
require payment of a sum sufficient to cover any stamp tax or governmental
charge imposed in respect of any such transfer of Notes. Notes shall not be
transferred in denominations of less than $10,000, provided that if necessary to
enable the registration of transfer by a holder of its entire holding of Notes,
one Note may be in a denomination of less than $10,000. Any transferee, by its
acceptance of a Note registered in its name (or the name of its nominee), shall
be deemed to have made the representation set forth in Section 6.

13.3.  Replacement of Notes.

          Upon receipt by the Company of evidence reasonably satisfactory to it
of the ownership of and the loss, theft, destruction or mutilation of any Note
(which evidence shall be, in the case of an Institutional Investor, notice from
such Institutional Investor of such ownership and such loss, theft, destruction
or mutilation), and

          (a)  in the case of loss, theft or destruction, of indemnity
reasonably satisfactory to it (provided that if the holder of such Note is, or
is a nominee for, an original Noteholder or another holder of a Note with a
minimum net worth of at least $1,000,000, such Person's own unsecured agreement
of indemnity shall be deemed to be satisfactory), or

          (b)  in the case of mutilation, upon surrender and cancellation
thereof,

the Company at its own expense shall execute and deliver, in lieu thereof, a new
Note, dated and bearing interest from the date to which interest shall have been
paid on such lost, stolen, destroyed or mutilated Note or dated the date of such
lost, stolen, destroyed or mutilated Note if no interest shall have been paid
thereon.

                                      -13-

<PAGE>

14.    PAYMENTS ON NOTES.

14.1.  Place of Payment.

          Subject to Section 14.2, payments of principal and interest becoming
due and payable on the Notes and any other amounts owing hereunder shall be made
in Houston, Texas at the principal office of 580 WestLake Park Blvd., Suite 600
in such jurisdiction. The Company may at any time, by notice to each holder of a
Note, change the place of payment of the Notes so long as such place of payment
shall be either the principal office of the Company in such jurisdiction or the
principal office of a bank or trust company in such jurisdiction.

14.2.  Home Office Payment.

          So long as you or your nominee shall be the holder of any Note, and
notwithstanding anything contained in Section 14.1 or in such Note to the
contrary, the Company will pay all sums becoming due on such Note for principal
and interest by the method and at the address specified for such purpose below
your name in Schedule A, or by such other method or at such other address as you
shall have from time to time specified to the Company in writing for such
purpose, without the presentation or surrender of such Note or the making of any
notation thereon, except that upon written request of the Company made
concurrently with or reasonably promptly after payment or prepayment in full of
any Note, you shall surrender such Note for cancellation, reasonably promptly
after any such request, to the Company at its principal executive office or at
the place of payment most recently designated by the Company pursuant to Section
14.1. Prior to any sale or other disposition of any Note held by you or your
nominee you will, at your election, either endorse thereon the amount of
principal paid thereon and the last date to which interest has been paid thereon
or surrender such Note to the Company in exchange for a new Note or Notes
pursuant to Section 13.2. The Company will afford the benefits of this Section
14.2 to any Person that is the direct or indirect transferee of any Note
purchased by you under this Agreement and that has made the same agreement
relating to such Note as you have made in this Section 14.2.

15.    EXPENSES, ETC.

15.1.  Transaction Expenses.

          Whether or not the transactions contemplated hereby are consummated,
the Company will pay all costs and expenses (including reasonable attorneys'
fees of a special counsel and, if reasonably required, local or other counsel)
incurred by you and each Other Noteholder or holder of a Note in connection with
such transactions and in connection with any amendments, waivers or consents
under or in respect of this Agreement or the Notes (whether or not such
amendment, waiver or consent becomes effective), including, without limitation:
(a) the costs and expenses incurred in enforcing or defending (or determining
whether or how to enforce or defend) any rights under this Agreement or the
Notes or in responding to any subpoena or other legal process or informal
investigative demand issued in connection with this Agreement or the Notes, or
by reason of being a holder of any Note, and (b) the costs and expenses,
including financial advisors' fees, incurred in connection with the insolvency
or bankruptcy of the Company or any Subsidiary or in connection with any
work-out or restructuring of the

                                      -14-

<PAGE>

transactions contemplated hereby and by the Notes. The Company will pay, and
will save you and each Other Noteholder or holder of a Note harmless from, all
claims in respect of any fees, costs or expenses if any, of brokers and finders
(other than those retained by you).

15.2.  Survival.

          The obligations of the Company under this Section 15 will survive the
payment or transfer of any Note, the enforcement, amendment or waiver of any
provision of this Agreement or the Notes, and the termination of this Agreement.

16.    SURVIVAL OF REPRESENTATIONS AND WARRANTIES; ENTIRE AGREEMENT.

          All representations and warranties contained herein shall survive the
execution and delivery of this Agreement and the Notes, the purchase or transfer
by you of any Note or portion thereof or interest therein and the payment of any
Note, and may be relied upon by any subsequent holder of a Note, regardless of
any investigation made at any time by or on behalf of you or any other holder of
a Note. All statements contained in any certificate or other instrument
delivered by or on behalf of the Company pursuant to this Agreement shall be
deemed representations and warranties of the Company under this Agreement.
Subject to the preceding sentence, this Agreement and the Notes embody the
entire agreement and understanding between you and the Company and supersede all
prior agreements and understandings relating to the subject matter hereof.

17.    AMENDMENT AND WAIVER.

17.1.  Requirements.

          This Agreement and the Notes may be amended, and the observance of any
term hereof or of the Notes may be waived (either retroactively or
prospectively), with (and only with) the written consent of the Company and the
Required Holders, except that (a) no amendment or waiver of any of the
provisions of Section 1, 2, 3, 4, 5, 6 or 20 hereof, or any defined term (as it
is used therein), will be effective as to you unless consented to by you in
writing, and (b) no such amendment or waiver may, without the written consent of
the holder of each Note at the time outstanding affected thereby, (i) subject to
the provisions of Section 12 relating to acceleration or rescission, change the
amount or time of any prepayment or payment of principal of, or reduce the rate
or change the time of payment or method of computation of interest on the Notes,
(ii) change the percentage of the principal amount of the Notes the holders of
which are required to consent to any such amendment or waiver, or (iii) amend
any of Sections 8, 5.01(a) of the Indenture as incorporated herein by reference
in Section 11 hereof, 12, 17 or 19.

17.2.  Solicitation of Holders of Notes.

          (a)  Solicitation. The Company will provide each holder of the Notes
(irrespective of the amount of Notes then owned by it) with sufficient
information, sufficiently far in advance of the date a decision is required, to
enable such holder to make an informed and considered decision with respect to
any proposed amendment, waiver or consent in respect of any

                                      -15-

<PAGE>

of the provisions hereof or of the Notes. The Company will deliver executed or
true and correct copies of each amendment, waiver or consent effected pursuant
to the provisions of this Section 17 to each holder of outstanding Notes
promptly following the date on which it is executed and delivered by, or
receives the consent or approval of, the requisite holders of Notes.

          (b)  Payment. The Company will not directly or indirectly pay or cause
to be paid any remuneration, whether by way of supplemental or additional
interest, fee or otherwise, or grant any security, to any holder of Notes as
consideration for or as an inducement to the entering into by any holder of
Notes or any waiver or amendment of any of the terms and provisions hereof
unless such remuneration is concurrently paid, or security is concurrently
granted, on the same terms, ratably to each holder of Notes then outstanding
even if such holder did not consent to such waiver or amendment.

17.3.  Binding Effect, etc.

          Any amendment or waiver consented to as provided in this Section 17
applies equally to all holders of Notes and is binding upon them and upon each
future holder of any Note and upon the Company without regard to whether such
Note has been marked to indicate such amendment or waiver. No such amendment or
waiver will extend to or affect any obligation, covenant, agreement, Default or
Event of Default not expressly amended or waived or impair any right consequent
thereon. No course of dealing between the Company and the holder of any Note nor
any delay in exercising any rights hereunder or under any Note shall operate as
a waiver of any rights of any holder of such Note. As used herein, the term
"this Agreement" and references thereto shall mean this Agreement as it may from
time to time be amended or supplemented. 18. NOTICES. All notices and
communications provided for hereunder shall be in writing and sent (a) by
telecopy if the sender on the same day sends a confirming copy of such notice by
a recognized overnight delivery service (charges prepaid), or (b) by registered
or certified mail with return receipt requested (postage prepaid), or (c) by a
recognized overnight delivery service (with charges prepaid). Any such notice
must be sent:

          (a)  if to you or your nominee, to you or it at the address specified
for such communications in Schedule A, or at such other address as you or it
shall have specified to the Company in writing,

          (b)  if to any other holder of any Note, to such holder at such
address as such other holder shall have specified to the Company in writing, or

          (c)  if to the Company, to the Company at its address set forth at the
beginning hereof to the attention of Mikel Faulkner, President and Chief
Executive Officer, with a copy to Elmer Johnston, General Counsel, or at such
other address as the Company shall have specified to the holder of each Note in
writing.

Notices under this Section 18 will be deemed given only when actually received.

                                      -16-

<PAGE>

19.    CONFIDENTIAL INFORMATION.

          For the purposes of this Section 19, "Confidential Information" means
information delivered to you by or on behalf of the Company or any Subsidiary in
connection with the transactions contemplated by or otherwise pursuant to this
Agreement that is proprietary in nature and that was clearly marked or labeled
or otherwise adequately identified when received by you as being confidential
information of the Company or such Subsidiary, provided that such term does not
include information that (a) was publicly known or otherwise known to you prior
to the time of such disclosure, (b) subsequently becomes publicly known through
no act or omission by you or any person acting on your behalf, (c) otherwise
becomes known to you other than through disclosure by the Company or any
Subsidiary or (d) constitutes financial statements delivered to you under
Section 7.1 that are otherwise publicly available. You will maintain the
confidentiality of such Confidential Information in accordance with procedures
adopted by you in good faith to protect confidential information of third
parties delivered to you, provided that you may deliver or disclose Confidential
Information to (i) your directors, officers, employees, agents, attorneys and
affiliates (to the extent such disclosure reasonably relates to the
administration of the investment represented by your Notes), (ii) your financial
advisors and other professional advisors who agree to hold confidential the
Confidential Information substantially in accordance with the terms of this
Section 19, (iii) any other holder of any Note, (iv) any Person to which you
sell or offer to sell such Note or any part thereof or any participation therein
(if such Person has agreed in writing prior to its receipt of such Confidential
Information to be bound by the provisions of this Section 19), (v) any Person
from which you offer to purchase any security of the Company (if such Person has
agreed in writing prior to its receipt of such Confidential Information to be
bound by the provisions of this Section 19), (vi) any federal or state
regulatory authority having jurisdiction over you, or (vii) any other Person to
which such delivery or disclosure may be necessary or appropriate (w) to effect
compliance with any law, rule, regulation or order applicable to you, (x) in
response to any subpoena or other legal process, (y) in connection with any
litigation to which you are a party or (z) if an Event of Default has occurred
and is continuing, to the extent you may reasonably determine such delivery and
disclosure to be necessary or appropriate in the enforcement or for the
protection of the rights and remedies under your Notes and this Agreement. Each
holder of a Note, by its acceptance of a Note, will be deemed to have agreed to
be bound by and to be entitled to the benefits of this Section 19 as though it
were a party to this Agreement. On reasonable request by the Company in
connection with the delivery to any holder of a Note of information required to
be delivered to such holder under this Agreement or requested by such holder
(other than a holder that is a party to this Agreement or its nominee), such
holder will enter into an agreement with the Company embodying the provisions of
this Section 19.

20.    SUBSTITUTION OF NOTEHOLDER.

          You shall have the right to substitute any one of the your Affiliates
as the holder of the Notes that you have agreed to purchase hereunder, by
written notice to the Company, which notice shall be signed by both you and such
Affiliate, shall contain such Affiliate's agreement to be bound by this
Agreement and shall contain a confirmation by such Affiliate of the accuracy
with respect to it of the representations set forth in Section 6. Upon receipt
of such notice, wherever the word "you" is used in this Agreement (other than in
this Section 21), such

                                      -17-

<PAGE>

word shall be deemed to refer to such Affiliate in lieu of you. In the event
that such Affiliate is so substituted as a purchaser hereunder and such
Affiliate thereafter transfers to you all of the Notes then held by such
Affiliate, upon receipt by the Company of notice of such transfer, wherever the
word "you" is used in this Agreement (other than in this Section 21), such word
shall no longer be deemed to refer to such Affiliate, but shall refer to you,
and you shall have all the rights of an original holder of the Notes under this
Agreement.

21.    MISCELLANEOUS.

21.1.  Successors and Assigns.

          All covenants and other agreements contained in this Agreement by or
on behalf of any of the parties hereto bind and inure to the benefit of their
respective successors and assigns (including, without limitation, any subsequent
holder of a Note) whether so expressed or not.

21.2.  Payments Due on Non-Business Days.

          Anything in this Agreement or the Notes to the contrary
notwithstanding, any payment of principal of or interest on any Note that is due
on a date other than a Business Day shall be made on the next succeeding
Business Day without including the additional days elapsed in the computation of
the interest payable on such next succeeding Business Day.

21.3.  Severability.

          Any provision of this Agreement that is prohibited or unenforceable in
any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of
such prohibition or unenforceability without invalidating the remaining
provisions hereof, and any such prohibition or unenforceability in any
jurisdiction shall (to the full extent permitted by law) not invalidate or
render unenforceable such provision in any other jurisdiction.

21.4.  Construction.

          Each covenant contained herein shall be construed (absent express
provision to the contrary) as being independent of each other covenant contained
herein, so that compliance with any one covenant shall not (absent such an
express contrary provision) be deemed to excuse compliance with any other
covenant. Where any provision herein refers to action to be taken by any Person,
or which such Person is prohibited from taking, such provision shall be
applicable whether such action is taken directly or indirectly by such Person.

21.5.  Counterparts.

          This Agreement and the related Notes may be executed in any number of
counterparts, each of which shall be an original but all of which together shall
constitute one instrument, and the delivery of an executed signature page by
facsimile or electronic means shall be binding upon the party delivering such a
signature page with the full effect as if an executed original signature page
had been delivered. Each counterpart may consist of a number of copies hereof,
each signed by less than all, but together signed by all, of the parties hereto.

                                      -18-

<PAGE>

21.6.  Governing Law.

          This Agreement shall be construed and enforced in accordance with, and
the rights of the parties shall be governed by, the law of the State of New York
excluding choice-of-law principles of the law of such State that would require
the application of the laws of a jurisdiction other than such State.

                                    * * * * *

                                      -19-

<PAGE>

          If you are in agreement with the foregoing, please sign the form of
agreement on the accompanying counterpart of this Agreement and return it to the
Company, whereupon the foregoing shall become a binding agreement between you
and the Company.

                                             Very truly yours,

                                             HARKEN ENERGY CORPORATION

                                             By:     /s/ Mikel D. Faulkner
                                                -------------------------------
                                             Name:
                                             Title:

The foregoing is hereby
agreed to as of the
date thereof.

[ADD NOTEHOLDER SIGNATURE BLOCKS]

                                      -20-

<PAGE>
                                                                      SCHEDULE A
                                                                      ----------

                       INFORMATION RELATING TO NOTEHOLDERS

                                                                   Fair Market
                                               Principal Amount    Value of 5%
                                                of Notes to be     Notes to be
                                                 Purchased at      Exchanged at
      Name and Address of Noteholder               Closing           Closing
--------------------------------------------   ----------------   --------------

MILGRAT I (II) IRREVOCABLE TRUST u/a
Catherine C. Miller &
Lloyd I. Miller III                            $        520,000   $      390,000

(1)  All payments by wire transfer of
     immediately available funds to:

PNC Bank
ABA 042000398
Trust Dept. AN: 4000107800
Acct: Milgrat I (II)
Acct. No: 700013965554

with sufficient information to identify the
source and application of such funds.

(2)  All notices of payments and written
     confirmations of such wire transfers:

PNC Bank
Attn: Alan Goldman, Trust Dept.
201 East 5/th/ Street
Cincinnati, Ohio 45202
(513) 651-8437

(3)  All other communications:

Lloyd I. Miller III
4550 Gordon Drive
Naples, FL  34102
Phone: (239) 262-8577
Fax: (239) 262-8025

                                  Schedule A-1

<PAGE>

                                                                   Fair Market
                                               Principal Amount    Value of 5%
                                                of Notes to be     Notes to be
                                                 Purchased at      Exchanged at
      Name and Address of Noteholder               Closing           Closing
--------------------------------------------   ----------------   --------------

MILFAM I Limited Partnership PNC Bank
Custodian                                      $        250,000   $      187,500

(1)  All payments by wire transfer of
     immediately available funds to:

PNC Bank
ABA 042000398
Trust Dept. AN: 4000107800
Acct: Milfam I Family
Acct. No: 700011058525

with sufficient information to identify the
source and application of such funds.

(2)  All notices of payments and written
     confirmations of such wire transfers:

PNC Bank
Attn: Alan Goldman, Trust Dept.
201 East 5/th/ Street
Cincinnati, Ohio 45202
(513) 651-8437

(3)  All other communications:

Lloyd I. Miller III
4550 Gordon Drive
Naples, FL  34102
Phone: (239) 262-8577
Fax: (239) 262-8025

                                      -2-

<PAGE>

                                                                   Fair Market
                                               Principal Amount    Value of 5%
                                                of Notes to be     Notes to be
                                                 Purchased at      Exchanged at
      Name and Address of Noteholder               Closing           Closing
--------------------------------------------   ----------------   --------------

Lloyd I. Miller III                            $        250,000   $      187,500

(1)  All payments by wire transfer of
     immediately available funds to:

Bank One Texas
ABA 111000614
FBO: First Southwest Company
Acct: 1822155345
Further Credit: Lloyd I. Miller
Acct. No: 55783602

with sufficient information to identify the
source and application of such funds.

(2)  All notices of payments and written
     confirmations of such wire transfers:

First Southwest Company
325 North St. Paul Street
Suite 800
Dallas, TX  75201

(3)  All other communications:

Lloyd I. Miller III
4550 Gordon Drive
Naples, FL  34102
Phone: (239) 262-8577
Fax: (239) 262-8025

                                      -3-

<PAGE>

                                                                   Fair Market
                                               Principal Amount    Value of 5%
                                                of Notes to be     Notes to be
                                                 Purchased at      Exchanged at
      Name and Address of Noteholder               Closing           Closing
--------------------------------------------   ----------------   --------------

MILFAM II Limited Partnership, Northern
Trust Company, Custodian                       $      1,000,000   $      750,000

(1)  All payments by wire transfer of
     immediately available funds to:

Northern CHGO/Trust
ABA: 071000152
Wire Acct: 5186061000
Acct.: 26-14417
FBO: Milfam II L.P.

with sufficient information to identify the
source and application of such funds.

(2)  All notices of payments and written
     confirmations of such wire transfers:

Northern Trust Company
Attn: Robert T. Demos
Wealth Management Group
50 South LaSalle Street
Chicago, IL 60675
(312) 557-8849

(3)  All other communications:

Lloyd I. Miller III
4550 Gordon Drive
Naples, FL  34102
Phone: (239) 262-8577
Fax: (239) 262-8025

                                      -4-

<PAGE>

                                                                      SCHEDULE B
                                                                      ----------

                                  DEFINED TERMS

          As used herein, the following terms have the respective meanings set
forth below or set forth in the Section hereof following such term:

          "Affiliate" means, at any time, and with respect to any Person, (a)
any other Person that at such time directly or indirectly through one or more
intermediaries Controls, or is Controlled by, or is under common Control with,
such first Person, and (b) any Person beneficially owning or holding, directly
or indirectly, 10% or more of any class of voting or equity interests of the
Company or any Subsidiary or any corporation of which the Company and its
Subsidiaries beneficially own or hold, in the aggregate, directly or indirectly,
10% or more of any class of voting or equity interests. As used in this
definition, "Control" means the possession, directly or indirectly, of the power
to direct or cause the direction of the management and policies of a Person,
whether through the ownership of voting securities, by contract or otherwise.
Unless the context otherwise clearly requires, any reference to an "Affiliate"
is a reference to an Affiliate of the Company.

          "Alternative Stock Exchange" means any other national or regional
stock exchange or quotation service such as NASDAQ National Market System or any
similar quotation service maintained by the National Quotation Bureau or any
successor thereto agreed between the Company and the holders of the Notes.

          "Board of Directors" means the board of directors of the Company.

          "Business Day" means any day other than a Saturday, a Sunday or a day
on which commercial banks in New York, New York are required or authorized to be
closed.

          "Capitalized Lease Obligation" means the amount of the liability under
any capital lease that, in accordance with GAAP, is required to be capitalized
and reflected as a liability on the balance sheet of the relevant Person.

          "Closing" is defined in Section 3.

          "Code" means the Internal Revenue Code of 1986, as amended from time
to time, and the rules and regulations promulgated thereunder from time to time.

          "Company" means Harken Energy Corporation, a Delaware corporation.

          "Conversion Price" means a price per Share equal to the average of the
Market Price of the Shares over the 30 calendar days immediately preceding the
date that is 15 days prior to the Prepayment Date, Interest Payment Date or the
Notes Stated Maturity, as applicable, subject to appropriate adjustments to
account for the effects of dividends, distributions, stock splits,
recapitalizations and similar events.

          "Confidential Information" is defined in Section 19.

                                  Schedule B-1

<PAGE>

          "Default" means an event or condition the occurrence or existence of
which would, with the lapse of time or the giving of notice or both, become an
Event of Default.

          "Default Rate" means that rate of interest that is 3% per annum above
the rate of interest stated in clause (a) of the first paragraph of the Notes or
(ii) 3% over the rate of interest publicly announced by JPMorgan Chase Bank as
its prime rate in effect at its principal office in New York City.

          "Event of Default" is defined in Section 11.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended.

          "Federal Bankruptcy Code" means the Bankruptcy Act or Title 11 of the
United States Code, as amended from time to time.

          "Freely Tradable" means, with respect to the Notes and the Shares,
that under the Securities Act the holders thereof may, without contractual or
legal restriction, then offer and sell any amount of such outstanding securities
to the public in the United States in transactions that are not brokers'
transactions (as defined in the Securities Act) either (i) pursuant to an
effective registration statement then in effect or (ii) pursuant to Rule 144(k).
For purposes of determining whether such securities are Freely Tradable, it
shall be assumed that no person that directly, or indirectly through one or more
intermediaries, controls, or is controlled by, or is under common control with,
the Company has ever held such securities from and after their issuance.

          "GAAP" means generally accepted accounting principles as in effect
from time to time in the United States of America.

          "Guarantee" means, with respect to any Person, any obligation (except
the endorsement in the ordinary course of business of negotiable instruments for
deposit or collection) of such Person guaranteeing or in effect guaranteeing any
indebtedness, dividend or other obligation of any other Person in any manner,
whether directly or indirectly, including (without limitation) obligations
incurred through an agreement, contingent or otherwise, by such Person:

          (a)  to purchase such indebtedness or obligation or any property
constituting security therefor;

          (b)  to advance or supply funds (i) for the purchase or payment of
such indebtedness or obligation, or (ii) to maintain any working capital or
other balance sheet condition or any income statement condition of any other
Person or otherwise to advance or make available funds for the purchase or
payment of such indebtedness or obligation;

          (c)  to lease properties or to purchase properties or services
primarily for the purpose of assuring the owner of such indebtedness or
obligation of the ability of any other Person to make payment of the
indebtedness or obligation; or

                                  Schedule B-2

<PAGE>

          (d)  otherwise to assure the owner of such indebtedness or obligation
against loss in respect thereof.

In any computation of the indebtedness or other liabilities of the obligor under
any Guarantee, the indebtedness or other obligations that are the subject of
such Guarantee shall be assumed to be direct obligations of such obligor.

          "holder" means, with respect to any Note, the Person in whose name
such Note is registered in the register maintained by the Company pursuant to
Section 13.1.

          "Indebtedness" of any Person means and includes all present and future
obligations of such Person, which shall include, without limitation, all
obligations (i) which in accordance with generally accepted accounting
principles in the United States shall be classified upon a balance sheet of such
Person as liabilities of such Person, (ii) for borrowed money, (iii) which have
been incurred in connection with the acquisition of property (including, without
limitation, all obligations of such Person evidenced by any debenture, bond,
note, commercial paper or other similar security, but excluding, in any case,
obligations arising from the endorsement in the ordinary course of business of
negotiable instruments for deposit or collection), (iv) secured by any Lien
existing on property owned by such Person, even though such Person has not
assumed or become liable for the payment of such obligations, (v) created or
arising under any conditional sale or other title retention agreement with
respect to Property acquired by such Person, notwithstanding the fact that the
rights and remedies of the seller, lender or lessor under such agreement in the
event of default are limited to repossession or sale of such Property, (vi)
which are Capitalized Lease Obligations, (vii) for all Guarantees, whether or
not reflected in the balance sheet of such Person and (viii) which are all
reimbursement and other payment obligations (whether contingent, matured or
otherwise) of such Person in respect of any acceptance or documentary credit.
Notwithstanding the foregoing, Indebtedness shall not include (i) Indebtedness
incidental to the operation of the business of the Person in the ordinary course
and in the aggregate not material to the business and operations of the Person,
(ii) Indebtedness for which the Company or any of its Subsidiaries are the sole
obligors and obligees, and (iii) Indebtedness represented by purchase, rental or
lease obligations not to exceed $1,000,000 in any period of 12 months for any
Person and its Subsidiaries.

          "Indenture" means that certain Trust Indenture, dated as of May 26,
1998, between the Company and Marine Midland Bank, a banking corporation and
trust company duly organized and existing under the laws of the State of New
York, as Trustee. For purposes of incorporation by reference into this Agreement
of terms in the Indenture, such reference shall be to the Indenture terms set
forth in the form of the Indenture attached as Exhibit 10.1 to the Company's
Form 10-Q for the quarterly period ended June 30, 1998, and such referenced
terms shall remain unmodified (other than as modified pursuant to this
Agreement) and such reference shall continue to be effective in each case
notwithstanding any subsequent amendments or supplements to the Indenture or the
termination of, breach of, or default under the Indenture, or the partial or
full payment or defeasance of the Indebtedness issued pursuant to the Indenture.

          "Interest Payment Date" has the meaning set forth in the Note.

                                  Schedule B-3

<PAGE>

          "Lien" means any mortgage, charge, pledge, lien, security interest or
encumbrance of any kind whatsoever, including any interest in property securing
an obligation owed to, or a claim by, a Person other than the owner of the
property, whether such interest is based on the common law, statute or contract,
and including but not limited to the security interest lien arising from a
mortgage, encumbrance, pledge, conditional sale or trust receipt or a lease,
consignment or bailment for security purposes. The term "Lien" shall include
reservations, exceptions, encroachments, easements, rights-of-way, covenants,
conditions, restrictions, leases and other title exceptions and encumbrances
affecting property. For the purposes of this Agreement, the Company or its
Subsidiary shall be deemed to be the owner of any property which it has acquired
or holds subject to a conditional sale agreement, financing lease or other
arrangement pursuant to which title to the property has been retained by or
vested in some other Person for security purposes.

          "Market Price" means, on any given day, the daily closing sale price
of the Shares for a Stock Exchange Business Day on The American Stock Exchange,
Inc. (the "AMEX") or, if not quoted on the AMEX, then on an Alternative Stock
Exchange, but if the Shares are not quoted on the AMEX or an Alternative Stock
Exchange, then the Market Price for any particular day shall be calculated
promptly at the Company's expense by a reputable investment bank selected by the
holders of the Notes.

          "Material" means material in relation to the business, operations,
affairs, financial condition, assets, properties, or prospects of the Company
and its Subsidiaries taken as a whole.

          "Material Adverse Effect" means a material adverse effect on (a) the
business, operations, affairs, financial condition, assets or properties of the
Company and its Subsidiaries taken as a whole, or (b) the ability of the Company
to perform its obligations under this Agreement and the Notes, or (c) the
validity or enforceability of this Agreement or the Notes.

          "Noteholder" shall mean each Person listed in Schedule A to the
Agreement.

          "Notes" is defined in Section 1.

          "Notes Stated Maturity" is defined in Section 2(d).

          "Officer's Certificate" means a certificate of a Senior Financial
Officer or of any other officer of the Company whose responsibilities extend to
the subject matter of such certificate.

          "Other Noteholders" is defined in Section 2(h).

          "Person" means an individual, partnership, corporation, limited
liability company, association, trust, unincorporated organization, or a
government or agency or political subdivision thereof.

                                  Schedule B-4

<PAGE>

          "Preferred Stock" means any class of capital stock of a corporation
that is preferred over any other class of capital stock of such corporation as
to the payment of dividends or the payment of any amount upon liquidation or
dissolution of such corporation.

          "Property", "property", "Properties" or "properties" means, unless
otherwise specifically limited, real or personal property of any kind, tangible
or intangible, choate or inchoate.

          "Required Holders" means, at any time, the holders of at least 75% in
principal amount of the Notes at the time outstanding.

          "Responsible Officer" means any Senior Financial Officer and any other
officer of the Company with responsibility for the administration of the
relevant portion of this Agreement.

          "Securities Act" means the Securities Act of 1933, as amended from
time to time and the rules and regulations promulgated from time to time by the
Securities and Exchange Commission pursuant thereto.

          "Senior Debt" means the Indebtedness owing as of the Closing Date by
the Company under that certain three-year loan facility agreement, dated
December 6, 2002, between the Company, certain of its Subsidiaries and Guaranty
Bank, FSB.

          "Senior Financial Officer" means the chief financial officer,
principal accounting officer, treasurer or comptroller of the Company.

          "Shares" means the common stock, par value U.S.$0.01, of the Company
(and all other (if any) shares or stock resulting from any sub-division,
consolidation or reclassification of such shares).

          "Stated Maturity" when used with respect to any Indebtedness or any
installment of principal thereof or interest thereon, means the date specified
in such Indebtedness as the fixed date on which the principal of such
Indebtedness or such installment of principal or interest is due and payable.

          "Subordinated Obligations" means any Indebtedness of the Company
outstanding on such date which is contractually subordinate or junior in right
of payment to the Notes and shall include, without limitation, the Company's 7%
Senior Convertible Note due 2006, Series A and the Company's 7% Senior
Convertible Note due 2007, Series A. Notwithstanding the immediately preceding
sentence, any Indebtedness and shares of Preferred Stock issued by any
Subsidiary shall, for purposes of this definition, be treated as Subordinated
Obligations.

          "Subsidiary" means, as to any Person, any corporation, association or
other business entity in which such Person or one or more of its Subsidiaries or
such Person and one or more of its Subsidiaries owns sufficient equity or voting
interests to enable it or them (as a group) ordinarily, in the absence of
contingencies, to elect a majority of the directors (or Persons

                                  Schedule B-5

<PAGE>

performing similar functions) of such entity, and any partnership or joint
venture if at least a 50% interest in the profits or capital thereof is owned by
such Person or one or more of its Subsidiaries or such Person and one or more of
its Subsidiaries (unless such partnership can and does ordinarily take major
business actions without the prior approval of such Person or one or more of its
Subsidiaries). Unless the context otherwise clearly requires, any reference to a
"Subsidiary" is a reference to a Subsidiary of the Company.

                                  Schedule B-6

<PAGE>

                                                                    SCHEDULE 5.3
                                                                    ------------

                                  Schedule B-7

<PAGE>

                                                                       EXHIBIT 1

                                 [FORM OF NOTE]

                            HARKEN ENERGY CORPORATION
              INCREASING RATE SENIOR SECURED NOTE DUE MAY 26, 2008

No. [_____]                                                               [Date]

$[_______]                                                   PPN[______________]

          FOR VALUE RECEIVED, the undersigned, HARKEN ENERGY CORPORATION (herein
called the "Company"), a corporation organized and existing under the laws of
the State of Delaware, hereby promises to pay to [____________], or registered
assigns, the principal sum of [_____________________] DOLLARS on May 26, 2008,
with interest (computed on the basis of a 360-day year of twelve 30-day months)
(a) on the unpaid balance thereof at the rate set forth in the following rate
table per annum from the date hereof, payable on May 27, 2003, on the first day
of January 2004 and, thereafter, quarterly on the first day of April, July,
October and January in each year (each such date an "Interest Payment Date"),
until the principal hereof shall have become due and payable, and (b) to the
extent permitted by law on any overdue payment (including any overdue
prepayment) of principal and any overdue payment of interest, payable quarterly
as aforesaid (or, at the option of the registered holder hereof, on demand), at
a rate per annum from time to time equal to the Default Rate, but in no event at
a rate greater than the maximum lawful rate.

                                   RATE TABLE
                                   ----------

--------------------------------------------------------------------------
            Interest Period                        Interest Rate
--------------------------------------------------------------------------
From the date hereof to May 26, 2004        10 1/4%
--------------------------------------------------------------------------
From May 26, 2004 to May 26, 2005           12 1/4%
--------------------------------------------------------------------------
From May 26, 2005 to May 26, 2006           14%
--------------------------------------------------------------------------
From May 26, 2006 to May 26, 2007           16%
--------------------------------------------------------------------------
From May 26, 2007 to May 26, 2008           17 1/2%
--------------------------------------------------------------------------

          Payments of principal of and interest on this Note are to be made in
lawful money of the United States of America at [ ] or at such other place as
the Company shall have designated by written notice to the holder of this Note
as provided in the Note Purchase Agreements referred to below; provided,
however, that so long as no Default or Event of Default shall have occurred and
be continuing (1) the interest payment owing on May 26, 2003 may be

                                   Exhibit 1-1

<PAGE>

made pursuant to the terms of the Indenture as applicable to such interest
payment on such Interest Payment Date and (2) (i) the remaining interest
payments owing hereunder may, at the Company's option (which option is properly
exercised only if written notice thereof is provided by the Company to each
holder of a Note on or before thirty (30) calendar days prior to the subject
Interest Payment Date but not before sixty (60) calendar days prior to the
subject Interest Payment Date), be satisfied by the issuance by the Company to
the holder of this Note of a number of Freely Tradeable Shares determined by
dividing the product of the amount of the subject interest payment and 1.125 by
the Conversion Price and (ii) payments of principal owing hereunder may, at the
Company's option (which option is properly exercised only if written notice
thereof is provided by the Company to each holder of a Note on or before thirty
(30) calendar days prior to the date such payment of principal is due but not
before sixty (60) calendar days prior to the date such payment of principal is
due), be satisfied by the (x) payment in full in lawful money of the United
States of America of an amount equal to seventy-five percent (75%) of such
principal amount and (y) issuance by the Company to the holder of this Note of a
number of Freely Tradeable Shares determined by dividing the product of the
amount that is twenty-five percent (25%) of such principal amount and 1.125 by
the Conversion Price. Examples of the foregoing calculations are set forth on
Exhibit 2 to the Note Purchase Agreements referred to below.

          This Note is one of a series of Senior Notes (herein called the
"Notes") issued pursuant to separate Note Purchase Agreements, dated as of May
26, 2003 (as from time to time amended, the "Note Purchase Agreements"), between
the Company and the Noteholder named therein and is entitled to the benefits
thereof. Each holder of this Note will be deemed, by its acceptance hereof, (i)
to have agreed to the confidentiality provisions set forth in Section 19 of the
Note Purchase Agreements and (ii) to have made the representation set forth in
Section 6 of the Note Purchase Agreements.

          This Note is a registered Note and, as provided in the Note Purchase
Agreements, upon surrender of this Note for registration of transfer, duly
endorsed, or accompanied by a written instrument of transfer duly executed, by
the registered holder hereof or such holder's attorney duly authorized in
writing, a new Note for a like principal amount will be issued to, and
registered in the name of, the transferee. Prior to due presentment for
registration of transfer, the Company may treat the person in whose name this
Note is registered as the owner hereof for the purpose of receiving payment and
for all other purposes, and the Company will not be affected by any notice to
the contrary.

          This Note is subject to optional prepayment in whole at the times and
on the terms specified in the Note Purchase Agreements, but not otherwise.

          If an Event of Default, as defined in the Note Purchase Agreements,
occurs and is continuing, the principal of this Note may be declared or
otherwise become due and payable in the manner, at the price and with the effect
provided in the Note Purchase Agreements.

          Capitalized terms used in this Note and not otherwise defined shall
have the meanings ascribed thereto in the Note Purchase Agreements.

                                   Exhibit 1-2

<PAGE>

          This Note shall be construed and enforced in accordance with, and the
rights of the parties shall be governed by, the law of the State of New York
excluding choice-of-law principles of the law of such State that would require
the application of the laws of a jurisdiction other than such State.

                                        HARKEN ENERGY CORPORATION

                                        By
                                          --------------------------------------
                                        [Title]

                                   Exhibit 1-3

<PAGE>

                                                                       EXHIBIT 2

                              EXAMPLE CALCULATIONS

Examples of Prepayment Amount/1/ Calculations:
---------------------------------------------

Example 1:
---------

If the nominal value of the outstanding Notes is $2,020,000 and the prepayment
option is exercised during the time period described in Section 8.1(b)(ii) of
the Agreement, the principal portion of the Prepayment Amount would be
$1,717,000 (or $2,020,000 x .85). If the interest owing under the Notes on the
Prepayment Date is $6,000 and no Section 8.1(d)(ii) election is made by the
Company, the Company would pay to the holders of the Notes, in cash, on the
Prepayment Date $1,723,000 (or $1,717,000 + $6,000).

If, under the same example, the Section 8.1(d)(ii) election is made by the
Company and the Conversion Price on such date is 34 cents, the Company would pay
to the holders of the Notes, in cash, on the Prepayment Date $1,508,375 (or
($1,717,000 x .875) + $6,000)) and distribute 710,156 (or (($1,717,000 x .125) x
1.125)/ .34) Freely Tradeable Shares to the holders of the Notes.

Example 2:
---------

If the nominal value of the outstanding Notes is $2,020,000 and the prepayment
option is exercised during the time period described in Section 8.1(b)(iv) of
the Agreement, the principal portion of the Prepayment Amount would be
$1,838,200 (or $2,020,000 x .91). If the interest owing under the Notes on the
prepayment date is $6,000 and no Section 8.1(d)(ii) election is made by the
Company, the Company would pay to the holders of the Notes, in cash, on the
Prepayment Date $1,844,200 (or $1,838,200 + $6,000).

If, under the same example, the Section 8.1(d)(ii) election is made by the
Company and the Conversion Price on such date is 38 cents, the Company would pay
to the holders of the Notes, in cash, on the Prepayment Date $1,614,425 (or
($1,838,200 x .875) + $6,000)) and distribute 680,255 (or (($1,838,200 x .125) x
1.125)/ .38) Freely Tradeable Shares to the holders of the Notes.

----------

/1/ All examples assume that the Prepayment Amount exists solely of principal
and interest and include no other amounts, such as amounts that may be owing
under Section 15.1 of the Agreement. Any such other amounts would be treated the
same as interest for purposes of the above calculations.

                                   Exhibit 1-4

<PAGE>

Examples of Principal and Interest Payment Calculations:
-------------------------------------------------------

Example 1 of Interest Payment:
-----------------------------

If interest owing is $10,000, the Conversion Price is 34 cents and the Company
elects to satisfy such payment obligation with Freely Tradeable Shares, it would
transfer to the Company 33,088 (or ($10,000 x 1.125)/ .34) Freely Tradeable
Shares.

Example 2 of Interest Payment:
-----------------------------

If interest owing is in the amount of $12,000, the Conversion Price is 37 cents
and the Company elects to satisfy such payment obligation with Freely Tradeable
Shares, it would transfer to the Company 36,486 (or ($12,000 x 1.125)/ .37)
Freely Tradeable Shares.

Example 1 of Principal Payment:
------------------------------

If principal owing is in the amount of $2,020,000, the Conversion Price is 34
cents and the Company elects to satisfy such payment obligation with Freely
Tradeable Shares to the extent permitted under the Note, the Company would pay
to the holders of the Notes, in cash, on the maturity date $1,515,000 (or
$2,020,000 x .75) and distribute 1,670,956 (($2,020,000 x .25) x 1.125)/ .34)
Freely Tradeable Shares to the holders of the Notes.

Example 2 of Principal Payment:
------------------------------

If principal owing is in the amount of $4,500,000, the Conversion Price is 38
cents and the Company elects to satisfy such payment obligation with Freely
Tradeable Shares to the extent permitted under the Note, the Company would pay
to the holders of the Notes, in cash, on the maturity date $3,375,000 (or
$4,500,000 x .75) and distribute 3,330,592 (($4,500,000 x .25) x 1.125)/ .38)
Freely Tradeable Shares to the holders of the Notes.

                                   Exhibit 1-5

<PAGE>

                                                                     EXHIBIT 4.4

                       FORM OF OPINION OF SPECIAL COUNSEL
                                 TO THE COMPANY

                            Matters To Be Covered In
                    Opinion of Special Counsel To the Company
                    -----------------------------------------

          1.   Each of the Company and its Subsidiaries being duly incorporated,
validly existing and in good standing and having requisite corporate power and
authority to issue and sell the Notes and to execute and deliver the documents.

          2.   Each of the Company and its Subsidiaries being duly qualified and
in good standing as a foreign corporation in appropriate jurisdictions.

          3.   Due authorization and execution of the documents and such
documents being legal, valid, binding and enforceable.

          4.   No conflicts with charter documents, laws or other agreements.

          5.   All consents required to issue and sell the Notes and to execute
and deliver the documents having been obtained.

          6.   No litigation questioning validity of documents.

          7.   The Notes not requiring registration under the Securities Act of
1933, as amended; no need to qualify an indenture under the Trust Indenture Act
of 1939, as amended.

          8.   No violation of Regulations G, T or X of the Federal Reserve
Board.

          9.   Company not an "investment company", or a company "controlled" by
an "investment company", under the Investment Company Act of 1940, as amended.

                                Exhibit 4.4(a)-1

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