1

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




                                WARRANT AGREEMENT

                            Dated as of July 24, 1995


                                     Between

                               HARCOR ENERGY, INC.

                                       and

                    TEXAS COMMERCE BANK NATIONAL ASSOCIATION,

                                as Warrant Agent

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

                                     -------

                   Warrants to Purchase Shares of Common Stock

                            Par Value $.10 Per Share




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

   2

                                TABLE OF CONTENTS



                                                                       Page
                                                                       ----
                                                                    
                                    ARTICLE I

                     ISSUANCE, FORM, EXECUTION, DELIVERY AND
                      REGISTRATION OF WARRANT CERTIFICATES

SECTION 1.01.  Issuance of Warrants..................................   2
SECTION 1.02.  Form of Warrant Certificates..........................   2
SECTION 1.03.  Execution of Warrant Certificates.....................   2
SECTION 1.04.  Authentication and Delivery...........................   3
SECTION 1.05.  Temporary Warrant Certificates........................   4
SECTION 1.06.  Separation of Warrants and Notes......................   5
SECTION 1.07.  Registration..........................................   5
SECTION 1.08.  Registration of Transfers and Exchanges...............   5
SECTION 1.09.  Lost, Stolen, Destroyed, Defaced or Mutilated 
                    Warrant Certificates.............................  13
SECTION 1.10.  Offices for Exercise, etc.............................  14


                                   ARTICLE II

                         DURATION, EXERCISE OF WARRANTS
                               AND EXERCISE PRICE

SECTION 2.01.  Duration of Warrants..................................  15
SECTION 2.02.  Exercise, Exercise Price, Settlement and Delivery.....  15
SECTION 2.03.  Cancellation of Warrant Certificates..................  18


                                   ARTICLE III

                          OTHER PROVISIONS RELATING TO
                          RIGHTS OF HOLDERS OF WARRANTS

SECTION 3.01.  Enforcement of Rights.................................  18


                                   ARTICLE IV

                        CERTAIN COVENANTS OF THE COMPANY

SECTION 4.01.  Payment of Taxes......................................  18
SECTION 4.02.  Qualification Under the Securities Laws...............  19



                                       -i-

   3



                                                                       Page
                                                                       ----
                                    ARTICLE V

                                   ADJUSTMENTS

                                                                    
SECTION 5.01.  Adjustment of Exercise Price and
                    Number of Shares Issuable........................  20
SECTION 5.02.  Fractional Interest...................................  29
SECTION 5.03.  When Adjustment Not Required..........................  29
SECTION 5.04.     Challenge to Good Faith Determination..............  30
SECTION 5.05.     Treasury Stock.....................................  30
SECTION 5.06.     Notices to Warrant Holders.........................  30


                                   ARTICLE VI

                          CONCERNING THE WARRANT AGENT

SECTION 6.01.  Warrant Agent.........................................  32
SECTION 6.02.  Conditions of Warrant Agent's Obligations.............  32
SECTION 6.03.  Resignation and Appointment of Successor..............  37


                                   ARTICLE VII

                                  MISCELLANEOUS

SECTION 7.01.  Amendment.............................................  39
SECTION 7.02.  Notices and Demands to the Company and Warrant Agent..  39
SECTION 7.03.  Addresses for Notices to Parties and for Transmission
                    of Documents.....................................  40
SECTION 7.04.  Notices to Holders....................................  40
SECTION 7.05.  Applicable Law........................................  41
SECTION 7.06.  Obtaining of Governmental Approvals...................  41
SECTION 7.07.  Persons Having Rights Under Agreement.................  41
SECTION 7.08.  Headings..............................................  41
SECTION 7.09.  Counterparts..........................................  41
SECTION 7.10.  Inspection of Agreement...............................  41
SECTION 7.11.  Successors............................................  42



EXHIBIT A - Form of Warrant Certificate
EXHIBIT B - Certificate To Be Delivered upon
                    Exchange or Registration of
                    Transfer of Warrants
EXHIBIT C - Transferee Letter of Representation


                                      -ii-

   4

                             INDEX OF DEFINED TERMS



Defined Term                                             Section
- ------------                                             -------
                                                      
Agreement.............................................   Recitals
Business Day..........................................   2.01
Common Stock..........................................   1.01
Company...............................................   Recitals
Convertible Securities................................   5.01(c)
Definitive Warrants...................................   1.02
Distribution..........................................   5.02(c)
Election To Exercise..................................   2.02(b)
Exercisability Date...................................   2.02(a)
Exercise Date.........................................   2.02(d)
Exercise Price........................................   2.02(a)
Expiration Date.......................................   2.01
Global Warrants.......................................   1.02
Indenture.............................................   Recitals
Initial Purchasers....................................   Recitals
Majority Holders......................................   5.04
Notes.................................................   Recitals
Prospectus............................................   4.02
Purchased Shares......................................   5.01(e)
Registrar.............................................   1.07
Related Parties.......................................   6.02(e)
Resale Restriction Termination Date...................   1.08
Securities Act........................................   1.06
Shares................................................   1.01
Time of Determination.................................   5.01(g)
Trustee...............................................   Recitals
Units.................................................   Recitals
Warrant Agent.........................................   6.01
Warrant Agent Office..................................   1.10
Warrant Certificates..................................   Recitals
Warrant Exercise Office...............................   2.02(b)
Warrant Register......................................   1.07
Warrants..............................................   Recitals





                                      -iii-

   5

                                WARRANT AGREEMENT


            WARRANT AGREEMENT ("Agreement"), dated as of July 24, 1995 by HarCor
Energy, Inc., a Delaware corporation (together with any successor thereto, the
"Company"), and Texas Commerce Bank National Association, a national banking
association, as warrant agent (with any successor Warrant Agent, the "Warrant
Agent").

            WHEREAS, the Company has entered into a purchase agreement dated
July 24, 1995 with BT Securities Corporation and Internationale Nederlanden
(U.S.) Securities Corporation (the "Initial Purchasers") in which the Company
has agreed, among other things, to sell to the Initial Purchasers (A) 65,000
units (the "Units") consisting in the aggregate of (i) $65,000,000 aggregate
principal amount of 14 7/8% Senior Secured Notes due 2002 (the "Notes") of the
Company to be issued under an indenture dated as of July 24, 1995 (the
"Indenture"), among the Company and Warrior, Inc. and HTAC Investments, Inc., as
guarantors and Texas Commerce Bank National Association, as trustee (the
"Trustee"), and (ii) 1,430,000 Warrants to purchase an equal number of shares of
common stock, $.10 par value per share (the "Common Stock"), of the Company (the
"Note Warrants") and (B) 350,000 Warrants to purchase an equal number of shares
of Common Stock (the "Additional Warrants" and, together with the Note Warrants,
the "Warrants", and the certificates evidencing the Warrants being hereinafter
referred to as "Warrant Certificates"), in each case subject to adjustment in
accordance with the terms hereof; and

            WHEREAS, the Note Warrants and the Notes comprising part of the
Units shall be separately transferable immediately; and

            WHEREAS, the Company desires the Warrant Agent as warrant agent to
assist the Company in connection with the issuance, exchange, cancellation,
replacement and exercise of the Warrants, and in this Agreement wishes to set
forth, among other things, the terms and conditions on which the Warrants may be
issued, exchanged, cancelled, replaced and exercised;

            NOW, THEREFORE, the parties hereto agree as follows:

   6

                                      -2-





                                    ARTICLE I

                     ISSUANCE, FORM, EXECUTION, DELIVERY AND
                      REGISTRATION OF WARRANT CERTIFICATES

            SECTION 1.01. Issuance of Warrants. Each Warrant Certificate shall
evidence the number of Warrants specified therein, and each Warrant evidenced
thereby shall represent the right, subject to the provisions contained herein
and therein, to purchase from the Company (and the Company shall issue and sell
to such holder of the Warrant) one fully paid and non-assessable share of the
Company's Common Stock (the shares of Common Stock purchasable upon exercise of
a Warrant being hereinafter referred to as the "Shares" and, where appropriate,
such term shall also mean the other securities or property purchasable and
deliverable upon exercise of a Warrant as provided in Article V) at the price
specified herein and therein, in each case subject to adjustment as provided
herein and therein.

            SECTION 1.02. Form of Warrant Certificates. The Warrant Certificates
will initially be issued either in global form (the "Global Warrants"),
substantially in the form of Exhibit A hereto (including footnote 1 thereto), or
in registered form as definitive Warrant certificates (the "Definitive
Warrants"). The Warrant Certificates evidencing the Global Warrants or the
Definitive Warrants to be delivered pursuant to this Agreement shall be
substantially in the form set forth in Exhibit A attached hereto. Such Global
Warrants shall represent such of the outstanding Warrants as shall be specified
therein and each shall provide that it shall represent the aggregate amount of
outstanding Warrants from time to time endorsed thereon and that the aggregate
amount of outstanding Warrants represented thereby may from time to time be
reduced or increased, as appropriate. Any endorsement of a Global Warrant to
reflect the amount of any increase or decrease in the amount of outstanding
Warrants represented thereby shall be made by the Warrant Agent and Depositary
(as defined below) in accordance with instructions given by the holder thereof.
The Depository Trust Company shall act as the Depositary with respect to the
Global Warrants until a successor shall be appointed by the Company. Upon
written request, a Warrant holder may receive from the Warrant Agent Definitive
Warrants as set forth in Section 1.08 hereof.

            SECTION 1.03. Execution of Warrant Certificates. The Warrant
Certificates shall be executed on behalf of the Company by the chairman of its
Board of Directors, its 

   7

                                      -3-





president or any vice president and attested by its secretary or assistant
secretary, under its corporate seal. Such signatures may be the manual or
facsimile signatures of the present or any future such officers. The seal of the
Company may be in the form of a facsimile thereof and may be impressed, affixed,
imprinted or otherwise reproduced on the Warrant Certificates. Typographical and
other minor errors or defects in any such reproduction of the seal or any such
signature shall not affect the validity or enforceability of any Warrant
Certificate that has been duly countersigned and delivered by the Warrant Agent.

            In case any officer of the Company who shall have signed any of the
Warrant Certificates shall cease to be such officer before the Warrant
Certificate so signed shall be countersigned and delivered by the Warrant Agent
or disposed of by the Company, such Warrant Certificate nevertheless may be
countersigned and delivered or disposed of as though the person who signed such
Warrant Certificate had not ceased to be such officer of the Company; and any
Warrant Certificate may be signed on behalf of the Company by such persons as,
at the actual date of the execution of such Warrant Certificate, shall be the
proper officers of the Company, although at the date of the execution and
delivery of this Agreement any such person was not such an officer.

            SECTION 1.04. Authentication and Delivery. Subject to the
immediately following paragraph, Warrant Certificates shall be authenticated by
manual signature and dated the date of authentication by the Warrant Agent and
shall not be valid for any purpose unless so authenticated and dated. The
Warrant Certificates shall be numbered and shall be registered in the Warrant
Register (as defined in Section 1.07 hereof).

            Upon the receipt by the Warrant Agent of a written order of the
Company, which order shall be signed by the chairman of its Board of Directors,
its president or any vice president and attested by its secretary or assistant
secretary, and shall specify the amount of Warrants to be authenticated, whether
the Warrants are to be Global Warrants or Definitive Warrants, the date of such
Warrants and such other information as the Warrant Agent may reasonably request,
without any further action by the Company, the Warrant Agent is authorized, upon
receipt from the Company at any time and from time to time of the Warrant
Certificates, duly executed as provided in Section 1.03 hereof, to authenticate
the Warrant Certificates and deliver them. Such authentication shall be by a
duly authorized signatory of the Warrant Agent (although it shall not be


   8

                                      -4-





necessary for the same signatory to sign all Warrant Certificates).

            In case any authorized signatory of the Warrant Agent who shall have
authenticated any of the Warrant Certificates shall cease to be such authorized
signatory before the Warrant Certificate shall be disposed of by the Company,
such Warrant Certificate nevertheless may be delivered or disposed of as though
the person who authenticated such Warrant Certificate had not ceased to be such
authorized signatory of the Warrant Agent; and any Warrant Certificate may be
authenticated on behalf of the Warrant Agent by such persons as, at the actual
time of authentication of such Warrant Certificates, shall be the duly
authorized signatories of the Warrant Agent, although at the time of the
execution and delivery of this Agreement any such person is not such an
authorized signatory.

            The Warrant Agent's authentication on all Warrant Certificates shall
be in substantially the form set forth in Exhibit A hereto.

            SECTION 1.05. Temporary Warrant Certificates. Pending the
preparation of definitive Warrant Certificates, the Company may execute, and the
Warrant Agent shall authenticate and deliver, temporary Warrant Certificates,
which are printed, lithographed, typewritten or otherwise produced,
substantially of the tenor of the definitive Warrant Certificates in lieu of
which they are issued and with such appropriate insertions, omissions,
substitutions and other variations as the officers executing such Warrant
Certificates may determine, as evidenced by their execution of such Warrant
Certificates.

            If temporary Warrant Certificates are issued, the Company will cause
definitive Warrant Certificates to be prepared without unreasonable delay. After
the preparation of definitive Warrant Certificates, the temporary Warrant
Certificates shall be exchangeable for definitive Warrant Certificates upon
surrender of the temporary Warrant Certificates at any office or agency
maintained by the Company for that purpose pursuant to Section 1.10 hereof.
Subject to the provisions of Section 4.01 hereof, such exchange shall be without
charge to the holder. Upon surrender for cancellation of any one or more
temporary Warrant Certificates, the Company shall execute, and the Warrant Agent
shall authenticate and deliver in exchange therefor, one or more definitive
Warrant Certificates representing in the aggregate a like number of Warrants.
Until so exchanged, the holder of a temporary Warrant Certificate shall 

   9

                                      -5-





in all respects be entitled to the same benefits under this Agreement as a
holder of a definitive Warrant Certificate.

            SECTION 1.06. Separation of Warrants and Notes. The Notes and
Warrants will be separately transferable immediately.

            SECTION 1.07. Registration. The Company will keep, at the office or
agency maintained by the Company for such purpose, a register or registers in
which, subject to such reasonable regulations as it may prescribe, the Company
shall provide for the registration of, and registration of transfer and exchange
of, Warrants as provided in this Article. Each person designated by the Company
from time to time as a person authorized to register the transfer and exchange
of the Warrants is hereinafter called, individually and collectively, the
"Registrar". The Company hereby initially appoints the Warrant Agent as
Registrar. Upon written notice to the Warrant Agent and any acting Registrar,
the Company may appoint a successor Registrar for such purposes.

            The Company will at all times designate one person (who may be the
Company and who need not be a Registrar) to act as repository of a master list
of names and addresses of the holders of Warrants (the "Warrant Register"). The
Warrant Agent will act as such repository unless and until some other person is,
by written notice from the Company to the Warrant Agent and the Registrar,
designated by the Company to act as such. The Company shall cause each Registrar
to furnish to such repository, on a current basis, such information as to all
registrations of transfer and exchanges effected by such Registrar, as may be
necessary to enable such repository to maintain the Warrant Register on as
current a basis as is practicable.

            SECTION 1.08. Registration of Transfers and Exchanges.

            (a)   Transfer and Exchange of Definitive Warrants. When Definitive 
Warrants are presented to the Warrant Agent with a request:

       (i)  to register the transfer of the Definitive Warrants; or

      (ii)  to exchange such Definitive Warrants for an equal number of 
            Definitive Warrants,

   10

                                      -6-





the Warrant Agent shall register the transfer or make the exchange as requested
if the requirements under this Warrant Agreement as set forth in this Section
1.08 hereof for such transactions are met; provided, however, that the
Definitive Warrants presented or surrendered for registration of transfer or
exchange:

      (x)   shall be duly endorsed or accompanied by a written instruction of
            transfer in form satisfactory to the Company and the Warrant Agent,
            duly executed by the holder thereof or by his attorney, duly
            authorized in writing; and

      (y)   in the case of Warrants the offer and sale of which have not been
            registered under the Securities Act and are presented for transfer
            or exchange prior to (x) the date which is three years after the
            later of the date of original issue and the last date on which the
            Company or any affiliate of the Company was the owner of such
            Warrant, or any predecessor thereto and (y) such later date, if any,
            as may be required by any subsequent change in applicable law (the
            "Resale Restriction Termination Date"), such Warrants shall be
            accompanied, in the sole discretion of the Company, by the following
            additional information and documents, as applicable:

            (A)   if such Warrant is being delivered to the Warrant Agent by a
                  holder for registration in the name of such holder, without
                  transfer, a certification from such holder to that effect (in
                  substantially the form of Exhibit B hereto); or

            (B)   if such Warrant is being transferred to a qualified
                  institutional buyer (as defined in Rule 144A under the
                  Securities Act) in accordance with Rule 144A under the
                  Securities Act or pursuant to an exemption from registration
                  in accordance with Rule 144 or Regulation S under the
                  Securities Act, a certification to that effect (in
                  substantially the form of Exhibit B hereto); or

            (C)   if such Warrant is being transferred to an institutional
                  "accredited investor" within the meaning of subparagraphs
                  (a)(1), (a)(2), (a)(3) or (a)(7) of Rule 501 under the
                  Securities Act, 

   11

                                      -7-





                  delivery of a Certificate of Transfer in the form of Exhibit C
                  hereto and an opinion of counsel and/or other information
                  satisfactory to the Company to the effect that such transfer
                  is in compliance with the Securities Act; or

            (D)   if such Warrant is being transferred in reliance on another
                  exemption from the registration requirements of the Securities
                  Act, a certification to that effect (in substantially the form
                  of Exhibit B hereto) and an opinion of counsel reasonably
                  acceptable to the Company to the effect that such transfer is
                  in compliance with the Securities Act.

            (b)   Restrictions on Transfer of a Definitive Warrant for a
Beneficial Interest in a Global Warrant. A Definitive Warrant may not be
transferred for a beneficial interest in a Global Warrant except upon
satisfaction of the requirements set forth below. Upon receipt by the Warrant
Agent of a Definitive Warrant, duly endorsed or accompanied by appropriate
instruments of transfer, in form satisfactory to the Warrant Agent, together
with:

            (A)   certification, substantially in the form of Exhibit B hereto,
                  that such Definitive Warrant is being transferred to a
                  "qualified institutional buyer" (as defined in Rule 144A under
                  the Securities Act) in accordance with Rule 144A under the
                  Securities Act; and

            (B)   written instructions directing the Warrant Agent to make, or
                  to direct the Depositary to make, an endorsement on the Global
                  Warrant to reflect an increase in the aggregate amount of the
                  Warrants represented by the Global Warrant,

then the Warrant Agent shall cancel such Definitive Warrant and cause, or direct
the Depositary to cause, in accordance with the standing instructions and
procedures existing between the Depositary and the Warrant Agent, the number of
Warrants represented by the Global Warrant to be increased accordingly. If no
Global Warrant is then outstanding, the Company shall issue and the Warrant
Agent shall authenticate a new Global Warrant in the appropriate amount.

   12

                                      -8-





            (c)   Transfer and Exchange of Global Warrants. The transfer and
exchange of Global Warrants or beneficial interests therein shall be effected
through the Depositary, in accordance with this Section 1.08 and the procedures
of the Depositary therefor.

            (d)   Transfer of a Beneficial Interest in a Global
Warrant for a Definitive Warrant.

       (i)  Any person having a beneficial interest in a Global Warrant may upon
            request transfer such beneficial interest for a Definitive Warrant.
            Upon receipt by the Warrant Agent of written instructions or such
            other form of instructions as is customary for the Depositary from
            the Depositary or its nominee on behalf of any person having a
            beneficial interest in a Global Warrant and upon receipt by the
            Warrant Agent of a written order or such other form of instructions
            as is customary for the Depositary or the person designated by the
            Depositary as having such a beneficial interest containing
            registration instructions and, in the case of any such transfer or
            exchange prior to the Resale Restriction Termination Date, the
            following additional information and documents:

            (A)   if such beneficial interest is being transferred to the person
                  designated by the Depositary as being the beneficial owner, a
                  certification from such person to that effect (in
                  substantially the form of Exhibit B hereto); or

            (B)   if such beneficial interest is being transferred to a
                  qualified institutional buyer (as defined in Rule 144A under
                  the Securities Act) in accordance with Rule 144A under the
                  Securities Act or pursuant to an exemption from registration
                  in accordance with Rule 144 or Regulation S under the
                  Securities Act, a certification to that effect from the
                  transferee or transferor (in substantially the form of Exhibit
                  B hereto); or

            (C)   if such beneficial interest is being transferred to an
                  institutional "accredited investor" within the meaning of
                  subparagraphs (a)(1), (a)(2), (a)(3) or (a)(7) of Rule 501
                  under the Securities Act, delivery of a Certificate of
                  Transfer 

   13

                                      -9-





                  in the form of Exhibit C hereto and an opinion of counsel
                  and/or other information satisfactory to the Company to the
                  effect that such transfer is in compliance with the Securities
                  Act; or

            (D)   if such beneficial interest is being transferred
                  in reliance on another exemption from the
                  registration requirements of the Securities Act,
                  a certification to that effect (in substantially
                  the form of Exhibit B hereto) and an opinion of
                  counsel reasonably acceptable to the Company to
                  the effect that such transfer is in compliance
                  with the Securities Act,

            then the Warrant Agent will cause, in accordance with the standing
            instructions and procedures existing between the Depositary and the
            Warrant Agent, the aggregate amount of the Global Warrant to be
            reduced and, following such reduction, the Company will execute and,
            upon receipt of an authentication order in the form of an Officers'
            Certificate (as defined), the Warrant Agent will authenticate and
            deliver to the transferee a Definitive Warrant.

      (ii)  Definitive Warrants issued in exchange for a beneficial interest in
            a Global Warrant pursuant to this Section 1.08(d) shall be
            registered in such names and in such authorized denominations as the
            Depositary, pursuant to instructions from its direct or indirect
            participants or otherwise, shall instruct the Warrant Agent in
            writing. The Warrant Agent shall deliver such Definitive Warrants to
            the persons in whose names such Warrants are so registered.

            (e)   Restrictions on Transfer and Exchange of Global Warrants.
Notwithstanding any other provisions of this Warrant Agreement (other than the
provisions set forth in subsection (f) of this Section 1.08), a Global Warrant
may not be transferred as a whole except by the Depositary to a nominee of the
Depositary or by a nominee of the Depositary to the Depositary or another
nominee of the Depositary or by the Depositary or any such nominee to a
successor Depositary or a nominee of such successor Depositary.

   14

                                      -10-





            (f)   Authentication of Definitive Warrants in Absence of 
Depositary. If at any time:

       (i)  the Depositary for the Warrants notifies the Company that the
            Depositary is unwilling or unable to continue as Depositary for the
            Global Warrant and a successor Depositary for the Global Warrant is
            not appointed by the Company within 90 days after delivery of such
            notice; or

      (ii)  the Company, at its sole discretion, notifies the Warrant Agent in
            writing that it elects to cause the issuance of Definitive Warrants
            under this Warrant Agreement,

then the Company will execute, and the Warrant Agent, upon receipt of an
officers' certificate signed by two officers of the Company (one of whom must be
the principal executive officer, principal financial officer or principal
accounting officer) (an "Officers' Certificate") requesting the authentication
and delivery of Definitive Warrants, will authenticate and deliver Definitive
Warrants, in an aggregate number equal to the aggregate number of warrants
represented by the Global Warrant, in exchange for such Global Warrant.

            (g)   Legends.

       (i)  Except to the extent permitted by the following paragraph (ii), each
            Warrant Certificate evidencing the Global Warrants and the
            Definitive Warrants (and all Warrants issued in exchange therefor or
            substitution thereof) shall bear a legend substantially to the
            following effect:

      THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF
      1933, AS AMENDED (THE "SECURITIES ACT"), AND, ACCORDINGLY, MAY NOT BE
      OFFERED OR SOLD WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR
      BENEFIT OF, U.S. PERSONS EXCEPT AS SET FORTH BELOW. BY ITS ACQUISITION
      HEREOF, THE HOLDER (1) REPRESENTS THAT (A) IT IS A "QUALIFIED
      INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) OR
      (B) IT IS AN INSTITUTIONAL "ACCREDITED INVESTOR" (AS DEFINED IN RULE 501
      (A)(1), (2), (3) OR (7) PROMULGATED UNDER THE SECURITIES ACT) (AN
      "ACCREDITED INVESTOR") OR (C) IT IS NOT A U.S. PERSON AND IS ACQUIRING
      THIS 

   15

                                      -11-





      SECURITY IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH RULE 904 UNDER THE
      SECURITIES ACT, (2) AGREES THAT IT WILL NOT RESELL OR OTHERWISE TRANSFER
      THIS SECURITY EXCEPT (A) TO HARCOR ENERGY, INC. (THE "COMPANY") OR ANY
      SUBSIDIARY THEREOF, (B) INSIDE THE UNITED STATES TO A QUALIFIED
      INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A PROMULGATED UNDER THE
      SECURITIES ACT, (C) INSIDE THE UNITED STATES TO AN INSTITUTIONAL
      ACCREDITED INVESTOR THAT, PRIOR TO SUCH TRANSFER, FURNISHED (OR HAS
      FURNISHED ON ITS BEHALF BY A U.S. BROKER-DEALER) TO THE WARRANT AGENT A
      SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING
      TO THE RESTRICTIONS ON TRANSFER OF THIS SECURITY, (D) OUTSIDE THE UNITED
      STATES IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH RULE 904 PROMULGATED
      UNDER THE SECURITIES ACT, (E) PURSUANT TO THE EXEMPTION FROM REGISTRATION
      PROVIDED BY RULE 144 PROMULGATED UNDER THE SECURITIES ACT (IF AVAILABLE),
      OR (F) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE
      SECURITIES ACT AND (3) AGREES THAT IT WILL GIVE TO EACH PERSON TO WHOM
      THIS SECURITY IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS
      LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS SECURITY WITHIN THREE
      YEARS AFTER THE ORIGINAL ISSUANCE OF THIS SECURITY, IF THE PROPOSED
      TRANSFEREE IS AN INSTITUTIONAL ACCREDITED INVESTOR, THE HOLDER MUST, PRIOR
      TO SUCH TRANSFER, FURNISH TO THE WARRANT AGENT AND HARCOR ENERGY, INC.
      (THE "COMPANY") SUCH CERTIFICATIONS, WRITTEN LEGAL OPINIONS OR OTHER
      INFORMATION AS EITHER OF THEM MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH
      TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION
      NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. AS
      USED HEREIN, THE TERMS "OFFSHORE TRANSACTION," "UNITED STATES" AND "U.S.
      PERSON" HAVE THE MEANING GIVEN TO THEM BY REGULATION S UNDER THE
      SECURITIES ACT. THIS LEGEND WILL BE REMOVED UPON THE REQUEST OF THE HOLDER
      AFTER THE RESALE RESTRICTION TERMINATION DATE.

      THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A
      SECURITYHOLDERS' AND REGISTRATION RIGHTS AGREEMENT DATED AS OF JULY 24,
      1995 AMONG BT SECURITIES CORPORATION, INTERNATIONALE NEDERLANDEN (U.S.)
      SECURITIES CORPORATION AND THE 

   16

                                      -12-





      COMPANY, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY.

            To the extent a Warrant Certificate evidences a Global Warrant, such
            Warrant Certificate shall also bear the legend with respect thereto
            substantially in the form set forth on Exhibit A hereto.

      (ii)  Upon any sale or transfer of a Warrant pursuant to Rule 144 under
            the Securities Act in accordance with Section 1.08 hereof or an
            effective registration statement under the Securities Act:

            (A)   in the case of any Warrant that is a Definitive Warrant, the
                  Warrant Agent shall permit the holder thereof to exchange such
                  Warrant for a Definitive Warrant that does not bear the first
                  paragraph of the legend set forth above and rescind any
                  related restriction on the transfer of such Warrant; and

            (B)   any such Warrant represented by a Global Warrant shall not be
                  subject to the provisions set forth in (i) above (such sales
                  or transfers being subject only to the provisions of Section
                  1.08(c) hereof); provided, however, that with respect to any
                  request for an exchange of a Warrant that is represented by a
                  Global Warrant for a Definitive Warrant that does not bear the
                  first paragraph of the legend set forth above, which request
                  is made in reliance upon Rule 144 under the Securities Act,
                  the holder thereof shall certify in writing to the Warrant
                  Agent that such request is being made pursuant to Rule 144
                  under the Securities Act (such certification to be
                  substantially in the form of Exhibit B hereto).

            (h)   Cancellation and/or Adjustment of a Global Warrant. At such 
time as all beneficial interests in a Global Warrant have either been exchanged
for Definitive Warrants, redeemed, repurchased or cancelled, such Global Warrant
shall be returned to or retained and cancelled by the Warrant Agent. At any time
prior to such cancellation, if any beneficial interest in a Global Warrant is
exchanged for Definitive Warrants, redeemed, repurchased or cancelled, the
number of Warrants represented by such Global Warrant shall be reduced and 

   17

                                      -13-





an endorsement shall be made on such Global Warrant, by the Warrant Agent to
reflect such reduction.

            (i)   Obligations with Respect to Transfers and Exchanges of
Definitive Warrants.

      (i)   To permit registrations of transfers and exchanges, the Company
            shall execute, at the Warrant Agent's request, and the Warrant Agent
            shall authenticate Definitive Warrants and Global Warrants.

     (ii)   All Definitive Warrants and Global Warrants issued upon any
            registration, transfer or exchange of Definitive Warrants or Global
            Warrants shall be the valid obligations of the Company, entitled to
            the same benefits under this Warrant Agreement as the Definitive
            Warrants or Global Warrants surrendered upon the registration of
            transfer or exchange.

    (iii)   Prior to due presentment for registration of transfer of any
            Warrant, the Warrant Agent and the Company may deem and treat the
            person in whose name any Warrant is registered as the absolute owner
            of such Warrant, and neither the Warrant Agent nor the Company shall
            be affected by notice to the contrary.

            (j)   Payment of Taxes. The Company will pay all documentary stamp
taxes attributable to the initial issuance of the Shares upon the exercise of
Warrants; provided, however, that the Company shall not be required to pay any
tax or taxes which may be payable in respect of any transfer involved in the
issue of any Warrant Certificates or any certificates for the Shares in a name
other than that of the registered holder of a Warrant Certificate surrendered
upon the exercise of a Warrant, and the Company shall not be required to issue
or deliver such Warrant Certificates unless or until the person or persons
requesting the issuance thereof shall have paid to the Company the amount of
such tax or shall have established to the satisfaction of the Company that such
tax has been paid.

            SECTION 1.09. Lost, Stolen, Destroyed, Defaced or Mutilated Warrant
Certificates. Upon receipt by the Company and the Warrant Agent (or any agent of
the Company or the Warrant Agent, if requested by the Company) of evidence
satisfactory to them of the loss, theft, destruction, defacement, or mutilation
of any Warrant Certificate and of indemnity reasonably satisfactory to them and,
in the case of mutilation or 

   18

                                      -14-





defacement, upon surrender thereof to the Warrant Agent for cancellation, then,
in the absence of notice to the Company or the Warrant Agent that such Warrant
Certificate has been acquired by a bona fide purchaser or holder in due course,
the Company shall execute, and an authorized signatory of the Warrant Agent
shall manually authenticate and deliver, in exchange for or in lieu of the lost,
stolen, destroyed, defaced or mutilated Warrant Certificate, a new Warrant
Certificate representing a like number of Warrants, bearing a number or other
distinguishing symbol not contemporaneously outstanding. Upon the issuance of
any new Warrant Certificate under this Section, the Company may require the
payment from the holder of such Warrant Certificate of a sum sufficient to cover
any tax, stamp tax or other governmental charge that may be imposed in relation
thereto and any other expenses (including the fees and expenses of the Warrant
Agent and the Registrar) in connection therewith. Every substitute Warrant
Certificate executed and delivered pursuant to this Section in lieu of any lost,
stolen or destroyed Warrant Certificate shall constitute an additional
contractual obligation of the Company, whether or not the lost, stolen or
destroyed Warrant Certificate shall be at any time enforceable by anyone, and
shall be entitled to the benefits of (but shall be subject to all the
limitations of rights set forth in) this Agreement equally and proportionately
with any and all other Warrant Certificates duly executed and delivered
hereunder. The provisions of this Section 1.09 are exclusive with respect to the
replacement of lost, stolen, destroyed, defaced or mutilated Warrant
Certificates and shall preclude (to the extent lawful) any and all other rights
or remedies notwithstanding any law or statute existing or hereafter enacted to
the contrary with respect to the replacement of lost, stolen, destroyed, defaced
or mutilated Warrant Certificates.

            The Warrant Agent is hereby authorized to authenticate in accordance
with the provisions of this Agreement, and deliver the new Warrant Certificates
required pursuant to the provisions of this Section.

            SECTION 1.10. Offices for Exercise, etc. So long as any of the
Warrants remain outstanding, the Company will designate and maintain in the
Borough of Manhattan, The City of New York: (a) an office or agency where the
Warrant Certificates may be presented for exercise, (b) an office or agency
where the Warrant Certificates may be presented for registration of transfer and
for exchange (including the exchange of temporary Warrant Certificates for
definitive Warrant Certificates 

   19

                                      -15-





pursuant to Section 1.05 hereof), and (c) an office or agency where notices and
demands to or upon the Company in respect of the Warrants or of this Agreement
may be served. The Company may from time to time change or rescind such
designation, as it may deem desirable or expedient; provided, however, that an
office or agency shall at all times be maintained in the Borough of Manhattan,
The City of New York, as provided in the first sentence of this Section. In
addition to such office or offices or agency or agencies, the Company may from
time to time designate and maintain one or more additional offices or agencies
within or outside The City of New York, where Warrant Certificates may be
presented for exercise or for registration of transfer or for exchange, and the
Company may from time to time change or rescind such designation, as it may deem
desirable or expedient. The Company will give to the Warrant Agent written
notice of the location of any such office or agency and of any change of
location thereof. The Company hereby designates the Warrant Agent at its agent's
office in the Borough of Manhattan, the City of New York (the "Warrant Agent
Office"), as the initial agency maintained for each such purpose.


                                   ARTICLE II

                DURATION, EXERCISE OF WARRANTS AND EXERCISE PRICE

            SECTION 2.01. Duration of Warrants. Subject to the terms and
conditions established herein, the Warrants shall expire at 5:00 p.m., New York
City time, on July 24, 2000 (the "Expiration Date"). Each Warrant may be
exercised on any Business Day (as defined below) on or after the Exercisability
Date (as defined below) and on or prior to the Expiration Date.

            Any Warrant not exercised before the close of business on the
Expiration Date relating to such Warrant shall become void, and all rights of
the holder under the Warrant Certificate evidencing such Warrant and under this
Agreement shall cease.

            "Business Day" shall mean any day on which (i) banks in New York
City, (ii) the principal national securities exchange or market on which the
Common Stock is listed or admitted to trading and (iii) the principal national
securities exchange or market, if any, on which the Warrants are listed or
admitted to trading are open for business.

            SECTION 2.02. Exercise, Exercise Price, Settlement and Delivery. (a)
Subject to the provisions of this 

   20

                                      -16-





Agreement, a holder of Warrants shall have the right to purchase from the
Company on or after July 24, 1996 (the "Exercisability Date") and on or prior to
the Expiration Date one fully paid, registered and non-assessable Share, subject
to adjustment in accordance with Article V hereof, at the purchase price of
$3.85 for each Warrant exercised (the "Exercise Price").

            (b)   Warrants may be exercised on or after the Exercisability Date 
by (i) surrendering at any office or agency maintained for that purpose by the
Company pursuant to Section 1.10 (each a "Warrant Exercise Office") the Warrant
Certificate evidencing such Warrants with the form of election to purchase
Shares set forth on the reverse side of the Warrant Certificate (the "Election
to Exercise") duly completed and signed by the registered holder or holders
thereof or by the duly appointed legal representative thereof or by a duly
authorized attorney, and (ii) paying in full the Exercise Price for each such
Warrant exercised and any other amounts required to be paid pursuant to Section
1.08(j) hereof. Each Warrant may be exercised only in whole.

            (c)   Simultaneously with the exercise of each Warrant, payment in
full of the Exercise Price shall be made in cash or by certified or official
bank check to be delivered to the office or agency where the Warrant Certificate
is being surrendered. No payment or adjustment shall be made on account of any
dividends on the Shares issued upon exercise of a Warrant.

            (d)   Upon such surrender of a Warrant Certificate and payment and
collection of the Exercise Price at any Warrant Exercise Office (other than any
Warrant Exercise Office that also is an office of the Warrant Agent), such
Warrant Certificate and payment shall be promptly delivered to the Warrant
Agent. The "Exercise Date" for a Warrant shall be the date when all of the items
referred to in the first sentence of paragraphs (b) and (c) of this Section 2.02
are received by the Warrant Agent at or prior to 2:00 p.m., New York City time,
on a Business Day and the exercise of the Warrants will be effective as of such
Exercise Date. If any items referred to in the first sentence of paragraphs (b)
and (c) are received after 2:00 p.m., New York City time, on a Business Day, the
exercise of the Warrants to which such item relates will be effective on the
next succeeding Business Day. Notwithstanding the foregoing, in the case of an
exercise of Warrants on the Expiration Date (as defined in Section 2.01), if all
of the items referred 

   21

                                      -17-





to in the first sentence of paragraphs (b) and (c) are received by the Warrant
Agent at or prior to 5:00 p.m., New York City time, on such Expiration Date, the
exercise of the Warrants to which such items relate will be effective on the
Expiration Date.

            (e)   Upon the exercise of a Warrant in accordance with the terms
hereof, the receipt of a Warrant Certificate and payment of the Exercise Price,
the Warrant Agent shall: (i) cause an amount equal to the Exercise Price to be
paid to the Company by crediting the same to the account designated by the
Company in writing to the Warrant Agent for that purpose; (ii) advise the
Company immediately by telephone of the amount so deposited to the Company's
account and promptly confirm such telephonic advice in writing; and (iii) as
soon as practicable, advise the Company in writing of the number of Warrants
(giving effect to Section 5.01(o) below) exercised in accordance with the terms
and conditions of this Agreement and the Warrant Certificates, the instructions
of each exercising holder of the Warrant Certificates with respect to delivery
of the Shares to which such holder is entitled upon such exercise, and such
other information as the Company shall reasonably request.

            (f)   Subject to Section 5.02 hereof, as soon as practicable after 
the exercise of any Warrant or Warrants in accordance with the terms hereof, the
Company shall issue or cause to be issued to or upon the written order of the
registered holder of the Warrant Certificate evidencing such exercised Warrant
or Warrants, a certificate or certificates evidencing the Shares to which such
holder is entitled, in fully registered form, registered in such name or names
as may be directed by such holder pursuant to the Election to Exercise, as set
forth on the reverse of the Warrant Certificate. The Warrant Agent shall have no
obligation to ascertain the number of Shares to be issued with respect to the
exercised Warrant or Warrants. Such certificate or certificates evidencing the
Shares shall be deemed to have been issued and any persons who are designated to
be named therein shall be deemed to have become the holder of record of such
Shares as of the close of business on the Exercise Date. After such exercise of
any Warrant or Warrants, the Company shall also issue or cause to be issued to
or upon the written order of the registered holder of such Warrant Certificate,
a new Warrant Certificate, countersigned by the Warrant Agent pursuant to the
Company's written instruction, evidencing the number of Warrants, if any,
remaining unexercised unless such Warrants shall have expired.

   22

                                      -18-





            SECTION 2.03. Cancellation of Warrant Certificates. In the event the
Company shall purchase or otherwise acquire Warrants, the Warrant Certificates
evidencing such Warrants may thereupon be delivered to the Warrant Agent, and if
so delivered, shall be canceled by it and retired. The Warrant Agent shall
cancel all Warrant Certificates properly surrendered for exchange, substitution,
transfer or exercise. The Warrant Agent shall destroy canceled Warrant
Certificates held by it and deliver a certificate of destruction to the Company.
The Warrant Agent shall account promptly to the Company with respect to Warrants
exercised and concurrently pay to the Company all monies received by the Warrant
Agent for the purchase of Warrant Shares through the exercise of such Warrants.


                                   ARTICLE III

                          OTHER PROVISIONS RELATING TO
                          RIGHTS OF HOLDERS OF WARRANTS

            SECTION 3.01. Enforcement of Rights. (a) Notwithstanding any of the
provisions of this Agreement, any holder of any Warrant Certificate, without the
consent of the Warrant Agent, the holder of any Shares or the holder of any
other Warrant Certificate, may, in and for his own behalf, enforce, and may
institute and maintain any suit, action or proceeding against the Company
suitable to enforce, his right to exercise the Warrant or Warrants evidenced by
his Warrant Certificate in the manner provided in such Warrant Certificate and
in this Agreement.

            (b)   Neither the Warrants nor any Warrant Certificate shall entitle
the holders thereof to any of the rights of a holder of Shares, including,
without limitation, the right to vote or to receive any dividends or other
payments or to consent or to receive notice as stockholders in respect of the
meetings of stockholders or for the election of directors of the Company or to
share in the assets of the Company in the event of the liquidation, dissolution
or winding up of the Company's affairs or any other matter, or any rights
whatsoever as stockholders of the Company.


                                   ARTICLE IV

                        CERTAIN COVENANTS OF THE COMPANY

            SECTION 4.01. Payment of Taxes. The Company will pay all documentary
stamp taxes attributable to the initial 

   23

                                      -19-





issuance of Warrants and of the Shares upon the exercise of Warrants or to the
separation of the Warrants and Notes as described in Section 4.01; provided,
however, that the Company shall not be required to pay any tax or other
governmental charge which may be payable in respect of any transfer or exchange
of any Warrant Certificates or any certificates for Shares in a name other than
the registered holder of a Warrant Certificate surrendered upon the exercise of
a Warrant. In any such case, no transfer or exchange shall be made unless or
until the person or persons requesting issuance thereof shall have paid to the
Company the amount of such tax or other governmental charge or shall have
established to the satisfaction of the Company that such tax or other
governmental charge has been paid or an exemption is available therefrom.

            SECTION 4.02. Qualification Under the Securities Laws. Prior to the
Exercisability Date, the Company will take all such action as is necessary to
cause the Shares issuable upon exercise of the Warrants to be registered or
otherwise qualified under the provisions of the Securities Act and pursuant to
all applicable state securities laws. So long as any unexpired Warrants remain
outstanding, the Company will file such amendments and/or supplements to any
registration statement under the Securities Act or under any state securities
laws covering the issuance of such Shares and supplement and keep current any
prospectus forming a part of such registration statement as may be necessary to
permit the Company to deliver to each person exercising a Warrant a prospectus
meeting the requirements of Section 10(a)(3) of the Securities Act (a
"Prospectus") and the regulations of the Securities and Exchange Commission and
otherwise complying with the Securities Act and regulations thereunder, and as
may be necessary to comply with any applicable state securities laws. The
Company shall, upon the request of any holder of Warrants that may be required
pursuant to the Securities Act to deliver a prospectus in connection with any
sale or other disposition of Shares, include within the plan of distribution
section of the Prospectus and in such other places in the Prospectus as may be
necessary, all information required under the Securities Act to enable such
holder to deliver a Prospectus in connection with sales or other dispositions of
such Shares, and the Company shall also take such action as may be necessary
under the Securities Act with respect to the related registration statement to
enable such holder to effect such delivery in connection with such sale or other
disposition. The Company further agrees to provide any holder who may be
required to deliver a prospectus upon the sale or other disposition of such
Shares, such number 

   24

                                      -20-





of copies of the Prospectus as such holder reasonably requests. The Warrant
Agent shall have no duty to monitor when such registration or qualification is
necessary nor shall the Warrant Agent be responsible for the Company's failure
to comply with this Section 4.02.


                                    ARTICLE V

                                   ADJUSTMENTS

            SECTION 5.01. Adjustment of Exercise Price and Number of Shares
Issuable. The number and kind of Shares purchasable upon the exercise of
Warrants and the Exercise Price shall be subject to adjustment from time to time
as follows:

            (a)   Stock Splits, Combinations, etc. In case the Company shall
      hereafter (A) pay a dividend or make a distribution on its Common Stock in
      shares of its capital stock (whether shares of Common Stock or of capital
      stock of any other class), (B) subdivide its outstanding shares of Common
      Stock or (C) combine its outstanding shares of Common Stock into a smaller
      number of shares, the (a) number of Shares purchasable upon exercise of
      each Warrant immediately prior thereto shall be adjusted so that the
      holder of any Warrant thereafter exercised shall be entitled to receive
      the number of Shares which such holder would have owned immediately
      following such action had such Warrant been exercised immediately prior
      thereto, and (b) the Exercise Price payable upon exercise of each Warrant
      shall be adjusted by multiplying such Exercise Price immediately prior to
      such adjustment by a fraction, of which the numerator shall be the number
      of Shares purchasable upon the exercise of each Warrant immediately prior
      to such adjustment, and of which the denominator shall be the number of
      Shares purchasable immediately thereafter. An adjustment made pursuant to
      this paragraph shall become effective immediately after the record date in
      the case of a dividend and shall become effective immediately after the
      effective date in the case of a subdivision, combination or
      reclassification. If, as a result of an adjustment made pursuant to this
      paragraph, the holder of any Warrant thereafter exercised shall become
      entitled to receive shares of two or more classes of capital stock of the
      Company, the Board of Directors of the Company (whose determination shall
      be conclusive) shall determine the allocation of the adjusted Exercise
      Price between or among shares of such classes of capital stock.

   25

                                      -21-





            (b)   Reclassification, Combinations, Mergers, etc. In case of any
      reclassification or change of outstanding shares of Common Stock (other
      than as set forth in paragraph (a) above and other than a change in par
      value, or from par value to no par value, or from no par value to par
      value, or in case of any consolidation or merger of the Company with or
      into another corporation (other than a merger in which the Company is the
      continuing corporation and which does not result in any reclassification
      or change of the then outstanding shares of Common Stock or other capital
      stock of the Company (other than a change in par value, or from par value
      to no par value, or from par value to par value or as a result of a
      subdivision or combination)) or in case of any sale or conveyance to
      another corporation of all or substantially all of the assets of the
      Company, then, as a condition of such reclassification, change,
      consolidation, merger, sale or conveyance, the Company or such a successor
      or purchasing corporation, as the case may be, shall forthwith make lawful
      and adequate provision whereby the holder of such Warrant then outstanding
      shall have the right thereafter to receive on exercise of such Warrant the
      kind and amount of shares of stock and other securities and property
      receivable upon such reclassification, change, consolidation, merger, sale
      or conveyance by a holder of the number of shares of Common Stock issuable
      upon exercise of such Warrant immediately prior to such reclassification,
      change, consolidation, merger, sale or conveyance and enter into a
      supplemental warrant agreement so providing. Such provisions shall include
      provision for adjustments which shall be as nearly equivalent as may be
      practicable to the adjustments provided for in this Article V. If the
      issuer of securities deliverable upon exercise of Warrants under the
      supplemental warrant agreement is an affiliate of the formed, surviving or
      transferee corporation, that issuer shall join in the supplemental warrant
      agreement. The above provisions of this paragraph (b) shall similarly
      apply to successive reclassifications and changes of shares of Common
      Stock and to successive consolidations, mergers, sales or conveyances.

            In case of any such reclassification, merger, consolidation or
      disposition of assets, the successor or acquiring corporation (if other
      than the Company) shall expressly assume the due and punctual observance
      and performance of each and every covenant and condition of this Warrant
      Agreement to be performed and observed by the

   26

                                      -22-





      Company and all the obligations and liabilities hereunder, subject to such
      modifications as may be deemed appropriate (as determined by resolution of
      the Board of Directors of the Company) in order to provide for adjustments
      of shares of the Common Stock for which this Warrant is exercisable which
      shall be as nearly equivalent as practicable to the adjustments provided
      for in this Article V. The foregoing provisions of this Section 5.01(b)
      shall similarly apply to successive reorganizations, reclassifications,
      mergers, consolidations or disposition of assets.

            (c)   Issuance of Options or Convertible Securities. In the event 
      the Company shall, at any time or from time to time after the date hereof,
      issue, sell, distribute or otherwise grant in any manner (including by
      assumption) to all holders of the Common Stock any rights to subscribe for
      or to purchase, or any warrants or options for the purchase of, Common
      Stock or any stock or securities convertible into or exchangeable for
      Common Stock (any such rights, warrants or options being herein called
      "Options" and any such convertible or exchangeable stock or securities
      being herein called "Convertible Securities") or any Convertible
      Securities (other than upon exercise of any Option), whether or not such
      Options or the rights to convert or exchange such Convertible Securities
      are immediately exercisable, and the price per share at which Common Stock
      is issuable upon the exercise of such Options or upon the conversion or
      exchange of such Convertible Securities (determined by dividing (i) the
      aggregate amount, if any, received or receivable by the Company as
      consideration for the issuance, sale, distribution or granting of such
      Options or any such Convertible Security, plus the minimum aggregate
      amount of additional consideration, if any, payable to the Company upon
      the exercise of all such Options or upon conversion or exchange of all
      such Convertible Securities, plus, in the case of Options to acquire
      Convertible Securities, the minimum aggregate amount of additional
      consideration, if any, payable upon the conversion or exchange of all such
      Convertible Securities, by (ii) the total maximum number of shares of
      Common Stock issuable upon the exercise of all such Options or upon the
      conversion or exchange of all such Convertible Securities or upon the
      conversion or exchange of all Convertible Securities issuable upon the
      exercise of all Options) shall be less than the current market price per
      share of Common Stock (determined pursuant to Section 5.01(g)) on the
      record date for the issuance, 

   27

                                      -23-

      sale, distribution or granting of such Options (any such event being
      herein called a "Distribution") then, effective upon such Distribution,
      the Exercise Price shall be reduced to the price (calculated to the
      nearest 1/1,000 of one cent) determined by multiplying the Exercise price
      in effect immediately prior to such Distribution by a fraction, the
      numerator of which shall be the sum of (i) the number of shares of Common
      Stock outstanding (exclusive of any treasury shares) immediately prior to
      such Distribution multiplied by the current market price per share of
      Common Stock (determined pursuant to Section 5.01(g)) on the date of such
      Distribution plus (ii) the consideration, if any, received by the Company
      upon such Distribution, and the denominator of which shall be the product
      of (A) the total number of shares of Common Stock outstanding (exclusive
      of any treasury shares) immediately after such Distribution multiplied by
      (B) the current market price per share of Common Stock (determined
      pursuant to Section 5.01(g)) on the record date for such Distribution. For
      purposes of the foregoing, the total maximum number of shares of Common
      Stock issuable upon exercise of all such Options or upon the conversion or
      exchange of all such Convertible Securities or upon the commission or
      exchange of the total maximum amount of the Convertible Securities
      issuable upon the exercise of all such Options shall be deemed to have
      been issued as of the date of such Distribution and thereafter shall be
      deemed to be outstanding and the Company shall be deemed to have received
      as consideration therefor such price per share, determined as provided
      above. Except as provided in paragraphs (j) and (k) below, no additional
      adjustment of the Exercise Price shall be made upon the actual exercise of
      such Options or upon conversion or exchange of the Convertible Securities
      or upon the conversion or exchange of the Convertible Securities issuable
      upon the exercise of such Options.

            (d) Dividends and Distributions. In the event the Company shall, at
      any time or from time to time after the date hereof, distribute to all the
      holders of Common Stock any dividends or other distribution of cash,
      evidences of its indebtedness, other securities or other properties or
      assets (in each case other than (i) dividends payable in Common Stock,
      Options or Convertible Securities and (ii) any cash dividend from current
      or retained earnings), or any options, warrants or other rights to
      subscribe for or purchase any of the foregoing, then (A) the Exercise
      Price shall be decreased to a price determined by 

   28

                                      -24-





      multiplying the Exercise Price then in effect by a fraction, the numerator
      of which shall be the current market price per share of Common Stock
      (determined pursuant to Section 5.01(g)) on the record date for such
      distribution less the sum of (X) the cash portion, if any, of such
      distribution per share of Common Stock outstanding (exclusive of any
      treasury shares) on the record date for such distribution plus (Y) the
      then fair market value (as determined in good faith by the Board of
      Directors of the Company) per share of Common Stock outstanding (exclusive
      of any treasury shares) on the record date for such distribution of that
      portion, if any, of such distribution consisting of evidences of
      indebtedness, other securities, properties, assets (other than cash),
      options, warrants or subscription or purchase rights, and the denominator
      of which shall be such current market price per share of Common Stock and
      (B) the number of Shares purchasable upon the exercise of each Warrant
      shall be increased to a number determined by multiplying the number of
      shares of Common Stock so purchasable immediately prior to the record date
      for such distribution by a fraction, the numerator of which shall be the
      Exercise Price in effect immediately prior to the adjustment required by
      clause (A) of this sentence and the denominator of which shall be the
      Exercise Price in effect immediately after such adjustment. The
      adjustments required by this paragraph (d) shall be made whenever any such
      distribution occurs retroactive to the record date for the determination
      of stockholders entitled to receive such distribution.

            (e)   Self-Tenders. In case of the consummation of a tender or
      exchange offer (other than an odd-lot tender offer) made by the Company or
      any subsidiary of the Company for all or any portion of the Common Stock
      to the extent that the cash and value of any other consideration included
      in such payment per share of Common Stock exceeds the first reported sales
      price per share of Common Stock on the trading day next succeeding the
      last time tenders or exchanges may be made pursuant to the tender or
      exchange offer (the "Expiration Time"), the Exercise Price shall be
      reduced so that the same shall equal the price determined by multiplying
      the Exercise Price in effect immediately prior to the Expiration Time by a
      fraction of which the numerator shall be the number of shares of Common
      Stock outstanding (including any tendered or exchanged shares) at the
      Expiration Time multiplied by the first reported sales price of the Common
      Stock on the trading 

   29

                                      -25-





      day next succeeding the Expiration Time, and the denominator shall be the
      sum of (A) the fair market value (determined by the Board of Directors of
      the Company, whose determination shall be conclusive and described in a
      resolution of the Board of Directors) 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 (B) the product of the number of shares of
      Common Stock outstanding (less any Purchased Shares) on the Expiration
      Time and the first reported sales price of the Common Stock on the trading
      day next succeeding the Expiration Time, such reduction to become
      effective immediately prior to the opening of business on the day
      following the Expiration Time.

            (f)   This paragraph intentionally omitted.

            (g)   Current Market Price. For the purpose of any computation of
      current market price, the current market price per share of Common Stock
      at any date shall be (x) for purposes of Section 5.02, the closing price
      on the business day immediately prior to the exercise of the applicable
      Warrant and (y) in all other cases, the average of the daily closing
      prices for the shorter of (i) the 20 consecutive trading days ending on
      the last full trading day on the exchange or market specified in the
      second succeeding sentence prior to the Time of Determination (as defined
      below) and (ii) the period commencing on the date next succeeding the
      first public announcement of the issuance, sale, distribution or granting
      in question through such last full trading day prior to the Time of
      Determination. The term "Time of Determination" as used herein shall be
      the time and date of the earlier to occur of (A) the date as of which the
      current market price is to be computed and (B) the last full trading day
      on such exchange or market before the commencement of "ex-dividend"
      trading in the Common Stock relating to the event giving rise to the
      adjustment required by paragraph (a), (b), (c) or (d). The closing price
      for any day shall be the last reported sale price regular way or, in case
      no such reported sale takes place on such day, the average of the closing
      bid and asked prices regular way for such day, in each case (1) on the
      principal national securities exchange on which the shares of Common Stock
      are listed or

   30

                                      -26-





      to which such shares are admitted to trading or (2) if the Common Stock is
      not listed or admitted to trading on a national securities exchange, in
      the over-the-counter market as reported by the Nasdaq National Market or
      any comparable system or (3) if the Common Stock is not listed on the
      Nasdaq National Market or a comparable system, as furnished by two members
      of the NASD selected from time to time in good faith by the Board of
      Directors of the Company for that purpose. In the absence of all of the
      foregoing, or if for any other reason the current market price per share
      cannot be determined pursuant to the foregoing provisions of this
      paragraph (g), the current market price per share shall be the fair market
      value thereof as determined in good faith by the Board of Directors of the
      Company.

            (h)   Certain Distributions. If the Company shall pay a dividend or
      make any other distribution payable in Options or Convertible Securities,
      then, for purposes of paragraph (c) above, such Options or Convertible
      Securities shall be deemed to have been issued or sold without
      consideration.

            (i)   Consideration Received. If any shares of Common Stock, Options
      or Convertible Securities shall be issued, sold or distributed for a
      consideration other than cash, the amount of the consideration other than
      cash received by the Company in respect thereof shall be deemed to be the
      then fair market value of such consideration (as determined in good faith
      by the Board of Directors of the Company). If any Options shall be issued
      in connection with the issuance and sale of other securities of the
      Company, together comprising one integral transaction in which no specific
      consideration is allocated to such Options by the parties thereto, such
      Options shall be deemed to have been issued without consideration;
      provided, however, that if such Options have an exercise price equal to or
      greater than the current market price of the Common Stock on the date of
      issuance of such Options, then such Options shall be deemed to have been
      issued for consideration equal to such exercise price.

            (j)   Deferral of Certain Adjustments. No adjustment to the Exercise
      Price (including the related adjustment to the number of Shares
      purchasable upon the exercise of each Warrant) shall be required hereunder
      unless such adjustment, together with other adjustments carried forward as

   31

                                      -27-





      provided below, would result in an increase or decrease of at least one
      percent (1%) of the Exercise Price; provided that any adjustments which by
      reason of this paragraph (j) are not required to be made shall be carried
      forward and taken into account in any subsequent adjustment. No adjustment
      need be made for a change in the par value of the Common Stock. All
      calculations under this Section shall be made to the nearest 1/1,000 of
      one cent or to the nearest 1/1000th of a share, as the case may be.

            (k)   Changes in Options and Convertible Securities. If the exercise
      price provided for in any Options referred to in paragraph (c) above, the
      additional consideration, if any, payable upon the conversion or exchange
      of any Convertible Securities referred to in paragraph (c) above, or the
      rate at which any Convertible Securities referred to in paragraph (c)
      above are Convertible into or exchangeable for Common Stock shall change
      at any time (other than under or by reason of provisions designed to
      protect against dilution upon an event which results in a related
      adjustment pursuant to this Article V), the Exercise Price then in effect
      and the number of Shares purchasable upon the exercise of each Warrant
      shall forthwith be readjusted (effective only with respect to any exercise
      of any Warrant after such readjustment) to the Exercise Price and number
      of Shares so purchasable that would then be in effect had the adjustment
      made upon the issuance, sale, distribution or granting of such Options or
      Convertible Securities been made based upon such changed purchase price,
      additional consideration or conversion rate, as the case may be, but only
      with respect to such Options and Convertible Securities as then remain
      outstanding.

            (l)   Expiration of Options and Convertible Securities. If, at any
      time after any adjustment to the number of Shares purchasable upon the
      exercise of each Warrant shall have been made pursuant to paragraph (c) or
      (k) above or this paragraph (l), any Options or Convertible Securities
      shall have expired unexercised, the number of such Shares so purchasable
      shall, upon such expiration, be readjusted and shall thereafter be such as
      they would have been had they been originally adjusted (or had the
      original adjustment not been required, as the case may be) as if (i) the
      only shares of Common Stock deemed to have been issued in connection with
      such Options or Convertible Securities were the shares of Common Stock, if
      any, actually issued or sold upon the exercise of such Options or

   32

                                      -28-





      Convertible Securities and (ii) such shares of Common Stock, if any, were
      issued or sold for the consideration actually received by the Company upon
      such exercise plus the aggregate consideration, if any, actually received
      by the Company for the issuance, sale, distribution or granting of all
      such Options or Convertible Securities, whether or not exercised; provided
      that no such readjustment shall have the effect of decreasing the number
      of such shares so purchasable by an amount (calculated by adjusting such
      decrease to account for all other adjustments made pursuant to this
      Article V following the date of the original adjustment referred to above)
      in excess of the amount of the adjustment initially made in respect of the
      issuance, sale, distribution or granting of such Options or Convertible
      Securities.

            (m)   Other Adjustments. In the event that at any time, as a result
      of an adjustment made pursuant to this Article V, holders of Warrants
      shall become entitled to receive any securities of the Company other than
      shares of Common Stock, thereafter the number of such other securities so
      receivable upon exercise of the Warrants and the Exercise Price applicable
      to such exercise shall be subject to adjustment from time to time in a
      manner and on terms as nearly equivalent as practicable to the provisions
      with respect to the Shares of Common Stock contained in this Article V.

            (n)   Other Action Affecting Common Stock. In case at any time or
      from time to time the Company shall take any action in respect of its
      Common Stock, other than any action described in this Article V, then the
      number of Shares for which this Warrant is exercisable shall be adjusted
      in such manner as may be equitable in the circumstances. If the Company
      shall at any time and from time to time issue or sell (i) any shares of
      any class of common stock other than Common Stock, (ii) any evidences of
      its indebtedness, shares of stock or other securities which are
      convertible into or exchangeable for such shares of common stock, with or
      without the payment of additional consideration in cash or property or
      (iii) any warrants or other rights to subscribe for or purchase any such
      shares of common stock or any such evidences, shares of stock or other
      securities, then in each such case such issuance shall be deemed to be of,
      or in respect of, Common Stock for purposes of this Article V; provided,
      however, that, without limiting the generality of the foregoing, if the

   33

                                      -29-





      Company shall take a record of the holders of its Common Stock for the
      purpose of entitling them to receive a dividend payable in, or other
      distribution of, common stock other than Common Stock, including shares of
      non-voting common stock, then the number of Shares for which this Warrant
      is exercisable immediately after the occurrence of any such event shall be
      adjusted to equal the aggregate number of shares of such common stock and
      of Common Stock which a record holder of the same number of Shares for
      which this Warrant is exercisable immediately prior to the occurrence of
      such event would own or be entitled to receive after the happening of such
      event.

            (o)   Statement of Warrants. Irrespective of any adjustment in the
      number or kind of Shares issuable upon the exercise of the Warrants or the
      Exercise Price, Warrants theretofore or thereafter issued shall continue
      to express the same number and kind of shares as are stated in the
      Warrants initially issuable pursuant to this Agreement.

            SECTION 5.02. Fractional Interest. The Company shall not be required
to issue fractional shares of Common Stock on the exercise of Warrants. If more
than one Warrant shall be presented for exercise in full at the same time by the
same holder, the number of full shares of Common Stock which shall be issuable
upon such exercise shall be computed on the basis of the aggregate number of
shares of Common Stock acquirable on exercise of the Warrants so presented. If
any fraction of a share of Common Stock would, except for the provisions of this
Section, be issuable on the exercise of any Warrant (or specified portion
thereof), the Company shall direct the transfer agent for the Common Stock to
pay an amount in cash calculated by the Company to equal the then current market
price per share (determined pursuant to Section 5.01(g)) multiplied by such
fraction computed to the nearest whole cent. Holders of Warrants, by their
acceptances of the Warrant Certificates, expressly waive any and all rights to
receive any fraction of a share of Common Stock or a stock certificate
representing a fraction of a share of Common Stock.

            SECTION 5.03. When Adjustment Not Required. If the Company shall
take a record of the holders of its Common Stock for the purpose of entitling
them to receive a dividend or distribution or subscription or purchase rights
and shall, thereafter and before the distribution to stockholders thereof,
legally abandon its plan to pay or deliver such dividend, 

   34

                                      -30-





distribution, subscription or purchase rights, then thereafter no adjustment
shall be required by reason of the taking of such record and any such adjustment
previously made in respect thereof shall be rescinded and annulled.

            SECTION 5.04. Challenge to Good Faith Determination. Whenever the
Board of Directors of the Company shall be required to make a determination in
good faith of the fair value of any item under this Article V, such
determination may be challenged in good faith by holders holding a majority of
the outstanding Warrants (the "Majority Holders"), and any dispute shall be
resolved by an investment banking firm of national standing selected by the
Company. The fee of such investment banking firm shall be paid by the Company,
unless such fair market value as determined by the investment banking firm is
more than 95% of the fair market value determined by the Board of Directors of
the Company, in which case the challenging holders shall be jointly and
severally liable for such fee.

            SECTION 5.05. Treasury Stock. The sale or other disposition of any
issued shares of Common Stock owned or held by or for the account of the Company
shall be deemed an issuance thereof and a repurchase thereof and designation of
such shares as treasury stock shall be deemed to be a redemption thereof for the
purposes of this Agreement.

            SECTION 5.06. Notices to Warrant Holders. In connection with any
adjustment of the Exercise Price pursuant to this Article V, the Company shall
(i) promptly after such adjustment or, if earlier, at least five (5) days prior
to the date on which notice of such adjustment is required to be given, if at
all, to The Depository Trust Company cause to be filed with the Warrant Agent a
certificate of a firm of independent public accountants of recognized standing
selected by the Board of Directors of the Company (who may be the regular
auditors of the Company) setting forth the Exercise Price after such adjustment
and setting forth in reasonable detail the method of calculation and the facts
upon which such calculations are based and setting forth the number of shares
(or portion thereof) issuable after such adjustment in the Exercise Price, upon
exercise of a Warrant and payment of the adjusted Exercise Price, which
certificate shall be conclusive evidence of the correctness of the matters set
forth therein, and (ii) promptly after such adjustment cause to be given to each
of the registered holders of the Warrant Certificates at his address appearing
on the Warrant Register written notice of 

   35

                                      -31-





such adjustments by first-class mail, postage prepaid. The Warrant Agent shall
be entitled to conclusively rely on the above-referenced accountant's
certificate and shall be under no duty or responsibility with respect to any
such certificate, except to exhibit the same from time to time to any Holder
desiring an inspection thereof during normal business hours upon reasonable
notice. The Warrant Agent shall not at any time be under any duty or
responsibility to any holder to determine whether any facts exist that may
require any adjustment of the number of Shares issuable on exercise of the
Warrants or the Exercise Price, or with respect to the nature or extent of any
such adjustment when made, or with respect to the method employed in making such
adjustment or the validity or value (or the kind or amount) of any Shares which
may be issuable on exercise of the Warrants. The Warrant Agent shall not be
responsible for any failure of the Company to make any cash payment or to issue,
transfer or deliver any shares of Common Stock or stock certificates or other
common stock or property upon the exercise of any Warrant.

            The Company shall, in addition, promptly notify the holders of the
Warrants of any determination of its Board of Directors pursuant to Section
5.01(n) that any actions affecting its Common Stock will not require an
adjustment to the Exercise Price or the number of Shares for which a Warrant is
exercisable, and shall specify in such notice the reasons for such
determination. In the event that the Majority Holders shall challenge any of the
calculations set forth in such notice within 20 days after the Company's
delivery thereof, the Company shall retain a firm of independent certified
public accountants of national standing selected by the Company to prepare and
execute a certificate verifying that no adjustment is required. The Company
shall promptly cause a signed copy of any certificate prepared pursuant to this
Section 5.06 to be delivered to each holder at his address appearing in the
Warrant Register. The Company shall keep at its office or agency designated
pursuant to Section 1.10 copies of all such certificates and cause the same to
be available for inspection at said office during normal business hours upon
reasonable notice by any holder or any prospective purchaser of a Warrant
designated by a holder thereof.

   36

                                      -32-





                                   ARTICLE VI

                          CONCERNING THE WARRANT AGENT

            SECTION 6.01. Warrant Agent. The Company hereby appoints Texas
Commerce Bank National Association as warrant agent (and in all capacities in
this Agreement, the "Warrant Agent") of the Company in respect of the Warrants
and the Warrant Certificates upon the terms and subject to the conditions herein
and in the Warrant Certificates set forth; and Texas Commerce Bank National
Association hereby accepts such appointment. The Warrant Agent shall have the
powers and authority specifically granted to and conferred upon it in the
Warrant Certificates and hereby and such further powers and authority to act on
behalf of the Company as the Company may hereafter grant to or confer upon it
and it shall accept in writing. All of the terms and provisions with respect to
such powers and authority contained in the Warrant Certificates are subject to
and governed by the terms and provisions hereof.

            SECTION 6.02. Conditions of Warrant Agent's Obligations. The Warrant
Agent accepts its obligations herein set forth upon the terms and conditions
hereof and in the Warrant Certificates, including the following, to all of which
the Company agrees and to all of which the rights hereunder of the holders from
time to time of the Warrant Certificates shall be subject:

            (a)   The Warrant Agent shall be entitled to compensation to be
agreed upon with the Company in writing for all services rendered by it and the
Company agrees promptly to pay such compensation and to reimburse the Warrant
Agent for its reasonable out-of-pocket expenses (including reasonable fees and
expenses of counsel) incurred without gross negligence or willful misconduct on
its part in connection with the services rendered by it hereunder. The Company
also agrees to indemnify the Warrant Agent, each predecessor Warrant Agent, and
their respective directors, officers, affiliates, agents and employees for, and
to hold it and its directors, officers, affiliates, agents and employees
harmless against, any loss, liability or expense of any nature whatsoever
(including, without limitation, fees and expenses of counsel) incurred without
gross negligence or willful misconduct on the part of the Warrant Agent or
predecessor Warrant Agent, arising out of or in connection with its acting as
such Warrant Agent hereunder and its exercise or failure to exercise of its
rights and performance of its obligations hereunder. The obligations of the

   37

                                      -33-





Company under this Section 6.02 shall survive the exercise and the expiration of
the Warrant Certificates and the resignation and removal of the Warrant Agent.

            (b)   In acting under this Agreement and in connection with the
Warrant Certificates, the Warrant Agent is acting solely as agent of the Company
and does not assume any obligation or relationship of agency or trust for or
with any of the owners or holders of the Warrant Certificates.

            (c)   The Warrant Agent may consult with counsel and any advice or
written opinion of such counsel shall be full and complete authorization and
protection in respect of any action taken, suffered or omitted by it hereunder
in good faith and in accordance with such advice or opinion.

            (d)   The Warrant Agent shall be fully protected and shall incur no
liability for or in respect of any action taken or omitted to be taken or thing
suffered by it in reliance upon any Warrant Certificate, notice, direction,
consent, certificate, affidavit, opinion of counsel, instruction, statement or
other paper or document reasonably believed by it to be genuine and to have been
presented or signed by the proper parties.

            (e)   The Warrant Agent, and its officers, directors, affiliates and
employees ("Related Parties"), may become the owners of, or acquire any interest
in, Warrant Certificates, shares or other obligations of the Company with the
same rights that it or they would have it if were not the Warrant Agent
hereunder and, to the extent permitted by applicable law, it or they may engage
or be interested in any financial or other transaction with the Company and may
act on, or as depositary, trustee or agent for, any committee or body of holders
of shares or other obligations of the Company as freely as if it were not the
Warrant Agent hereunder. Nothing in this Agreement shall be deemed to prevent
the Warrant Agent or such Related Parties from acting in any other capacity for
the Company.

            (f)   The Warrant Agent shall not be under any liability for 
interest on, and shall not be required to invest, any monies at any time
received by it pursuant to any of the provisions of this Agreement or of the
Warrant Certificates.

            (g)   The Warrant Agent shall not be under any responsibility in
respect of the validity of this Agreement (or any term or provision hereof) or
the execution and delivery hereof 

   38

                                      -34-





(except the due execution and delivery hereof by the Warrant Agent) or in
respect of the validity or execution of any Warrant Certificate (except its
authentication thereof).

            (h)   The recitals and other statements contained herein and in the
Warrant Certificates (except as to the Warrant Agent's authentication thereon)
shall be taken as the statements of the Company and the Warrant Agent assumes no
responsibility for the correctness of the same. The Warrant Agent does not make
any representation as to the validity or sufficiency of this Agreement or the
Warrant Certificates, except for its due execution and delivery of this
Agreement; provided, however, that the Warrant Agent shall not be relieved of
its duty to authenticate the Warrant Certificates as authorized by this
Agreement. The Warrant Agent shall not be accountable for the use or application
by the Company of the proceeds of the exercise of any Warrant.

            (i)   Before the Warrant Agent acts or refrains from acting with
respect to any matter contemplated by this Warrant Agreement, it may require:

            (1)   an Officers' Certificate (as defined in the Indenture) stating
      that, in the opinion of the signers, all conditions precedent, if any,
      provided for in this Warrant Agreement relating to the proposed action
      have been complied with; and

            (2)   if reasonably necessary in the sole judgment of the Warrant
      Agent, an opinion of counsel for the Company stating that, in the opinion
      of such counsel, all such conditions precedent have been complied with.

            Each Officers' Certificate or, if requested, an opinion of counsel
with respect to compliance with a condition or covenant provided for in this
Warrant Agreement shall include:

            (1)   a statement that the person making such certificate or opinion
      has read such covenant or condition;

            (2)   a brief statement as to the nature and scope of the 
      examination or investigation upon which the statements or opinions
      contained in such certificate or opinion are based;

            (3)   a statement that, in the opinion of such person, he or she has
      made such examination or investigation as is 

   39

                                      -35-





      necessary to enable him or her to express an informed opinion as to
      whether or not such covenant or condition has been complied with; and

            (4)   a statement as to whether or not, in the opinion of such 
      person, such condition or covenant has been complied with.

            (j)   The Warrant Agent shall be obligated to perform such duties as
are herein and in the Warrant Certificates specifically set forth and no implied
duties or obligations shall be read into this Agreement or the Warrant
Certificates against the Warrant Agent. The Warrant Agent shall not be
accountable or under any duty or responsibility for the use by the Company of
any of the Warrant Certificates authenticated by the Warrant Agent and delivered
by it to the Company pursuant to this Agreement. The Warrant Agent shall have no
duty or responsibility in case of any default by the Company in the performance
of its covenants or agreements contained in the Warrant Certificates or in the
case of the receipt of any written demand from a holder of a Warrant Certificate
with respect to such default, including, without limiting the generality of the
foregoing, any duty or responsibility to initiate or attempt to initiate any
proceedings at law or otherwise or, except as provided in Section 7.02 hereof,
to make any demand upon the Company. The Warrant Agent shall not be obligated to
perform any duty to the extent prohibited by law.

            (k)   Unless otherwise specifically provided herein, any order,
certificate, notice, request, direction or other communication from the Company
made or given under any provision of this Agreement shall be sufficient if
signed by its chairman of the Board of Directors, its president, its treasurer,
its controller or any vice president or its secretary or any assistant
secretary.

            (l)   The Warrant Agent shall have no responsibility in respect of
any adjustment pursuant to Article V hereof.

            (m)   The Company agrees that it will perform, execute, acknowledge
and deliver, or cause to be performed, executed, acknowledged and delivered, all
such further and other acts, instruments and assurances as may reasonably be
required by the Warrant Agent for the carrying out or performing by the Warrant
Agent of the provisions of this Agreement.

   40

                                      -36-





            (n)   The Warrant Agent is hereby authorized and directed to accept
written instructions with respect to the performance of its duties hereunder
from any one of the chairman of the Board of Directors, the president, the
treasurer, the controller, any vice president or the secretary of the Company or
any other officer or official of the Company reasonably believed to be
authorized to give such instructions and to apply to such officers or officials
for advice or instructions in connection with its duties, and it shall not be
liable for any action taken or suffered to be taken by it in good faith in
accordance with instructions with respect to any matter arising in connection
with the Warrant Agent's duties and obligations arising under this Agreement.
Such application by the Warrant Agent for written instructions from the Company
may, at the option of the Warrant Agent, set forth in writing any action
proposed to be taken or omitted by the Warrant Agent with respect to its duties
or obligations under this Agreement and the date on or after which such action
shall be taken and the Warrant Agent shall not be liable for any action taken or
omitted in accordance with a proposal included in any such application on or
after the date specified therein (which date shall be not less than 10 Business
Days after the Company receives such application unless the Company consents to
a shorter period), provided that (i) such application includes a statement to
the effect that it is being made pursuant to this paragraph (n) and that unless
objected to prior to such date specified in the application, the Warrant Agent
will not be liable for any such action or omission to the extent set forth in
such application and (ii) prior to taking or omitting any such action, the
Warrant Agent has not received written instructions objecting to such proposed
action or omission.

             (o)  Whenever in the performance of its duties under this Agreement
the Warrant Agent shall deem it necessary or desirable that any fact or matter
be proved or established by the Company prior to taking or suffering any action
hereunder, such fact or matter (unless other evidence in respect thereof be
herein specifically prescribed) may be deemed to be conclusively proved and
established by a certificate signed by any one of the chairman of the Board of
Directors, the president, the treasurer, the controller, any vice president or
the secretary of the Company or any other officer or official of the Company
reasonably believed to be authorized to give such instructions and delivered to
the Warrant Agent; and such certificate shall be full authorization to the
Warrant Agent for any action taken or suffered in good faith by it under the
provisions of this Agreement in reliance upon such certificate.

   41
                                      -37-





            (p)   The Warrant Agent shall not be required to risk or expend its
own funds in the performance of its obligations and duties hereunder.

             SECTION 6.03.   Resignation and Appointment of Successor. (a) The
Company agrees, for the benefit of the holders from time to time of the Warrant
Certificates, that there shall at all times be a Warrant Agent hereunder.

             (b)  The Warrant Agent may at any time resign as Warrant Agent by
giving written notice to the Company of such intention on its part, specifying
the date on which its desired resignation shall become effective, provided that
such date shall be at least 30 days after the date on which such notice is given
unless the Company agrees to accept less notice. Upon receiving such notice of
resignation, the Company shall promptly appoint a successor Warrant Agent,
qualified as provided in Section 6.03(d) hereof, by written instrument in
duplicate signed on behalf of the Company, one copy of which shall be delivered
to the resigning Warrant Agent and one copy to the successor Warrant Agent. As
provided in Section 6.03(d) hereof, such resignation shall become effective upon
the earlier of (x) the acceptance of the appointment by the successor Warrant
Agent or (y) 30 days after receipt by the Company of notice of such resignation.
The Company may, at any time and for any reason, and shall, upon any event set
forth in the next succeeding sentence, remove the Warrant Agent and appoint a
successor Warrant Agent by written instrument in duplicate, specifying such
removal and the date on which it is intended to become effective, signed on
behalf of the Company, one copy of which shall be delivered to the Warrant Agent
being removed and one copy to the successor Warrant Agent. The Warrant Agent
shall be removed as aforesaid if it shall become incapable of acting, or shall
be adjudged a bankrupt or insolvent, or a receiver of the Warrant Agent or of
its property shall be appointed, or any public officer shall take charge or
control of it or of its property or affairs for the purpose of rehabilitation,
conservation or liquidation. Any removal of the Warrant Agent and any
appointment of a successor Warrant Agent shall become effective upon acceptance
of appointment by the successor Warrant Agent as provided in Section 6.03(d). As
soon as practicable after appointment of the successor Warrant Agent, the
Company shall cause written notice of the change in the Warrant Agent to be
given to each of the registered holders of the Warrants in the manner provided
for in Section 7.04 hereof.

   42
                                      -38-





            (c)   Upon resignation or removal of the Warrant Agent, if the 
Company shall fail to appoint a successor Warrant Agent within a period of 30
days after receipt of such notice of resignation or removal, then the holder of
any Warrant Certificate or the Warrant Agent may apply to a court of competent
jurisdiction for the appointment of a successor to the Warrant Agent. Pending
appointment of a successor to the Warrant Agent, either by the Company or by
such a court, the duties of the Warrant Agent shall be carried out by the
Company.

            (d)   Any successor Warrant Agent, whether appointed by the Company 
or by a court, shall be a bank or trust company in good standing, incorporated
under the laws of the United States of America or any State thereof and having,
at the time of its appointment, a combined capital surplus of at least $50
million. Such successor Warrant Agent shall execute and deliver to its
predecessor and to the Company an instrument accepting such appointment
hereunder and all the provisions of this Agreement, and thereupon such successor
Warrant Agent, without any further act, deed or conveyance, shall become vested
with all the rights, powers, duties and obligations of its predecessor
hereunder, with like effect as if originally named as Warrant Agent hereunder,
and such predecessor shall thereupon become obligated to (i) transfer and
deliver, and such successor Warrant Agent shall be entitled to receive, all
securities, records or other property on deposit with or held by such
predecessor as Warrant Agent hereunder and (ii) upon payment of the amounts then
due it pursuant to Section 6.02(a) hereof, pay over, and such successor Warrant
Agent shall be entitled to receive, all monies deposited with or held by any
predecessor Warrant Agent hereunder.

            (e)   Any corporation or bank into which the Warrant Agent hereunder
may be merged or converted, or any corporation or bank with which the Warrant
Agent may be consolidated, or any corporation or bank resulting from any merger,
conversion or consolidation to which the Warrant Agent shall be a party, or any
corporation or bank to which the Warrant Agent shall sell or otherwise transfer
all or substantially all of its corporate trust business, shall be the successor
to the Warrant Agent under this Agreement (provided that such corporation or
bank shall be qualified as aforesaid) without the execution or filing of any
document or any further act on the part of any of the parties hereto.

   43
                                      -39-





            (f)   No Warrant Agent under this Warrant Agreement shall be
personally liable for any action or omission of any successor Warrant Agent or
of the Company.

                                   ARTICLE VII

                                  MISCELLANEOUS

            SECTION 7.01.   Amendment. This Agreement and the terms of the
Warrants may be amended by the Company and the Warrant Agent, without the
consent of the holder of any Warrant Certificate, for the purpose of curing any
ambiguity, or of curing, correcting or supplementing any defective or
inconsistent provision contained herein or therein or in any other manner which
the Company may deem necessary or desirable and which shall not adversely affect
in any material respect the interests of the holders of the Warrant
Certificates.

            The Company and the Warrant Agent may modify this Agreement and the
terms of the Warrants with the consent of not less than a majority in number of
the then outstanding Warrants for the purpose of adding any provision to or
changing in any manner or eliminating any of the provisions of this Agreement or
modifying in any manner the rights of the holders of the outstanding Warrants;
provided, however, that no such modification that decreases the Exercise Rate,
reduces the period of time during which the Warrants are exercisable hereunder,
otherwise materially and adversely affects the exercise rights of the holders of
the Warrants, reduces the percentage required for modification, or effects any
change to this Section 7.01 may be made with respect to an outstanding Warrant
without the consent of the holder of such Warrant.

            Any modification or amendment made in accordance with this Agreement
will be conclusive and binding on all present and future holders of Warrant
Certificates whether or not they have consented to such modification or
amendment or waiver and whether or not notation of such modification or
amendment is made upon such Warrant Certificates. Any instrument given by or on
behalf of any holder of a Warrant Certificate in connection with any consent to
any modification or amendment will be conclusive and binding on all subsequent
holders of such Warrant Certificate.

            SECTION 7.02. Notices and Demands to the Company and Warrant Agent.
If the Warrant Agent shall receive any notice or demand addressed to the Company
by the holder of a Warrant 


   44
                                      -40-





Certificate pursuant to the provisions hereof or of the Warrant Certificates,
the Warrant Agent shall promptly forward such notice or demand to the Company.

            SECTION 7.03. Addresses for Notices to Parties and for Transmission
of Documents. All notices hereunder to the parties hereto shall be deemed to
have been given when sent by certified or registered mail, postage prepaid, or
by telex or telecopy, confirmed by first class mail, postage prepaid, addressed
to any party hereto as follows:

            To the Company:

            HarCor Energy, Inc.
            Five Post Oak Park
            4400 Post Oak Parkway
            Suite 2220
            Houston, Texas  77027-3413

            Attention:  President

            with copies to:

            Vinson & Elkins L.L.P.
            1001 Fourth, Suite 2300
            Houston, Texas  77024

            Attention:  John S. Watson
            Facsimile:  (713) 758-2346
            Telephone:  (713) 758-2222

            To the Warrant Agent:

            Texas Commerce Bank National Association
            600 Travis, 8th Floor
            Houston, Texas  77002

            Attention:  Vice President of Corporate Trust

or at any other address of which either of the foregoing shall have notified the
other in writing.

            SECTION 7.04. Notices to Holders. Notices to holders of Warrants
shall be mailed to such holders at the addresses of such holders as they appear
in the Warrant Register. Any such notice shall be sufficiently given if sent by
first-class mail, postage prepaid.

   45
                                      -41-






            SECTION 7.05.   APPLICABLE LAW. THE VALIDITY, INTERPRETATION AND
PERFORMANCE OF THIS AGREEMENT AND EACH WARRANT CERTIFICATE ISSUED HEREUNDER AND
OF THE RESPECTIVE TERMS AND PROVISIONS THEREOF SHALL BE GOVERNED BY THE LAWS OF
THE STATE OF NEW YORK, WITHOUT GIVING EFFECT TO THE CONFLICT OF LAWS PROVISIONS
THEREOF.

            SECTION 7.06.   Obtaining of Governmental Approvals. The Company 
will from time to time take all action required to be taken by it which may be
necessary to obtain and keep effective any and all permits, consents and
approvals of governmental agencies and authorities and securities acts filings
under United States Federal and State laws, and the rules and regulations of all
stock exchanges on which the Warrants are listed which may be or become
requisite in connection with the issuance, sale, transfer, and delivery of the
Warrant Certificates, the exercise of the Warrants or the issuance, sale,
transfer and delivery of the shares issued upon exercise of the Warrants.

            SECTION 7.07.   Persons Having Rights Under Agreement. Nothing in 
this Agreement expressed or implied and nothing that may be inferred from any of
the provisions hereof is intended, or shall be construed, to confer upon, or
give to, any person or corporation other than the Company, the Warrant Agent and
the holders of the Warrant Certificates any right, remedy or claim under or by
reason of this Agreement or of any covenant, condition, stipulation, promise or
agreement hereof; and all covenants, conditions, stipulations, promises and
agreements in this Agreement contained shall be for the sole and exclusive
benefit of the Company and the Warrant Agent and their successors and of the
holders of the Warrant Certificates.

            SECTION 7.08.   Headings. The descriptive headings of the several
Articles and Sections of this Agreement are inserted for convenience only and
shall not control or affect the meaning or construction of any of the provisions
hereof.

            SECTION 7.09.   Counterparts. This Agreement may be executed in any
number of counterparts, each of which so executed shall be deemed to be an
original; but such counterparts shall together constitute but one and the same
instrument.

            SECTION 7.10.   Inspection of Agreement. A copy of this Agreement
shall be available at all reasonable times at the principal corporate trust
office of the Warrant Agent, for inspection by the holder of any Warrant
Certificate. The 

   46
                                      -42-





Warrant Agent may require such holder to submit his Warrant Certificate for
inspection by it.

            SECTION 7.11.   Successors. All the covenants and provisions of this
Agreement by or for the benefit of the Company or the Warrant Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

   47
                                      -43-


            IN WITNESS WHEREOF, this Agreement has been duly executed by the
parties hereto as of the day and year first above written.

                               HARCOR ENERGY, INC.


                               By:
                                   --------------------------------
                                   Name: Mark G. Harrington
                                   Title: Chairman of the Board
                                            of Directors and
                                            Chief Executive Officer


                               TEXAS COMMERCE BANK NATIONAL
                               ASSOCIATION, as Warrant Agent


                               By:
                                   --------------------------------
                                   Name:  Steven Horowitz
                                   Title: Corporate Trust Officer


   48



                                                                       EXHIBIT A



                          [FORM OF WARRANT CERTIFICATE]

                                     [FACE]

            [Unless and until it is exchanged in whole or in part for Warrants
in certificated form, this Warrant may not be transferred except as a whole by
the Depositary to a nominee of the Depositary or by a nominee of the Depositary
to the Depositary or another nominee of the Depositary or by the Depositary or
any such nominee to a successor Depositary or a nominee of such successor
Depositary. Unless this certificate is presented by an authorized representative
of The Depository Trust Company, a New York corporation ("DTC"), to the issuer
or its agent for registration of transfer, exchange or payment, and any
certificate issued is registered in the name of Cede & Co. or such other name as
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or such other entity as is requested by an authorized representative
of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR
TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co.,
has an interest herein.](1)

THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933, AS
AMENDED (THE "SECURITIES ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD
WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS
EXCEPT AS SET FORTH BELOW. BY ITS ACQUISITION HEREOF, THE HOLDER (1) REPRESENTS
THAT (A) IT IS A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER
THE SECURITIES ACT) OR (B) IT IS AN INSTITUTIONAL "ACCREDITED INVESTOR" (AS
DEFINED IN RULE 501 (A)(1), (2), (3) OR (7) PROMULGATED UNDER THE SECURITIES
ACT) (AN "ACCREDITED INVESTOR") OR (C) IT IS NOT A U.S. PERSON AND IS ACQUIRING
THIS SECURITY IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH RULE 904 UNDER THE
SECURITIES ACT, (2) AGREES THAT IT WILL NOT RESELL OR OTHERWISE TRANSFER THIS
SECURITY EXCEPT (A) TO HARCOR ENERGY, INC. (THE "COMPANY") OR ANY SUBSIDIARY
THEREOF, (B) INSIDE THE UNITED STATES TO A QUALIFIED INSTITUTIONAL BUYER IN
COMPLIANCE WITH RULE 144A PROMULGATED UNDER THE SECURITIES ACT, (C) INSIDE THE
UNITED STATES TO AN INSTITUTIONAL ACCREDITED INVESTOR THAT, PRIOR TO SUCH
TRANSFER, FURNISHED (OR HAS FURNISHED ON ITS BEHALF BY A U.S. BROKER-DEALER) TO
THE WARRANT AGENT A SIGNED LETTER CONTAINING CERTAIN

- -------------------------
(1)      This paragraph is to be included only if the Warrant is in global form.


                                       A-1


   49

REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF THIS
SECURITY, (D) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN COMPLIANCE
WITH RULE 904 PROMULGATED UNDER THE SECURITIES ACT, (E) PURSUANT TO THE
EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 PROMULGATED UNDER THE
SECURITIES ACT (IF AVAILABLE), OR (F) PURSUANT TO AN EFFECTIVE REGISTRATION
STATEMENT UNDER THE SECURITIES ACT AND (3) AGREES THAT IT WILL GIVE TO EACH
PERSON TO WHOM THIS SECURITY IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT
OF THIS LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS SECURITY WITHIN THREE
YEARS AFTER THE ORIGINAL ISSUANCE OF THIS SECURITY, IF THE PROPOSED TRANSFEREE
IS AN INSTITUTIONAL ACCREDITED INVESTOR, THE HOLDER MUST, PRIOR TO SUCH
TRANSFER, FURNISH TO THE WARRANT AGENT AND HARCOR ENERGY, INC. (THE "COMPANY")
SUCH CERTIFICATIONS, WRITTEN LEGAL OPINIONS OR OTHER INFORMATION AS EITHER OF
THEM MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT
TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION
REQUIREMENTS OF THE SECURITIES ACT. AS USED HEREIN, THE TERMS "OFFSHORE
TRANSACTION," "UNITED STATES" AND "U.S. PERSON" HAVE THE MEANING GIVEN TO THEM
BY REGULATION S UNDER THE SECURITIES ACT. THIS LEGEND WILL BE REMOVED UPON THE
REQUEST OF THE HOLDER AFTER THE RESALE RESTRICTION TERMINATION DATE.

THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A SECURITYHOLDERS'
AND REGISTRATION RIGHTS AGREEMENT DATED AS OF JULY 24, 1995 AMONG BT SECURITIES
CORPORATION, INTERNATIONALE NEDERLANDEN (U.S.) SECURITIES CORPORATION AND THE
COMPANY, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY.


                                                                 CUSIP #[      ]

No. [   ]                                                      [      ] Warrants


                               WARRANT CERTIFICATE

                               HARCOR ENERGY, INC.


            This Warrant Certificate certifies that [         ], or registered 
assigns, is the registered holder of [   ] Warrants (the "Warrants") to purchase
shares of Common Stock, par value $.10 per share (the "Common Stock"), of HARCOR
ENERGY, INC., a Delaware corporation (the "Company"). Each Warrant entitles the
holder to purchase from the Company at any time on or after July 24, 1996 until
5:00 p.m., New York City time, on July 24, 2000 (the "Expiration Date"), one
fully paid and nonassessable share of Common Stock (a "Share", or, if adjusted,

                                       A-2


   50

the "Shares", which may also include any other securities or property
purchasable upon exercise of a Warrant, such adjustment and inclusion each as
provided in the Warrant Agreement) at the exercise price (the "Exercise Price")
of $3.85 per Warrant upon surrender of this Warrant Certificate and payment of
the Exercise Price at any office or agency maintained for that purpose by the
Company (the "Warrant Agent Office"), subject to the conditions set forth herein
and in the Warrant Agreement.

            The Exercise Price shall be payable by cash, certified check or
official bank check or by such other means as is acceptable to the Company in
the lawful currency of the United States of America which as of the time of
payment is legal tender for payment of public or private debts. The Company has
initially designated the office of the Warrant Agent at its agent's office in
the Borough of Manhattan, the City of New York, as the initial Warrant Agent
Office. The number of Shares issuable upon exercise of the Warrants ("Exercise
Rate") is subject to adjustment upon the occurrence of certain events set forth
in the Warrant Agreement.

            Any Warrants not exercised on or prior to 5:00 p.m., New York City
time, on July 24, 2000 shall thereafter be void.

            Reference is hereby made to the further provisions on the reverse
hereof which provisions shall for all purposes have the same effect as though
fully set forth at this place. Capitalized terms used in this Warrant
Certificate but not defined herein shall have the meanings ascribed thereto in
the Warrant Agreement.

            This Warrant Certificate shall not be valid unless authenticated by
the Warrant Agent, as such term is used in the Warrant Agreement.

            THIS WARRANT CERTIFICATE SHALL BE CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF NEW YORK WITHOUT GIVING EFFECT TO THE CONFLICT OF LAWS
PROVISIONS THEREOF.


                                       A-3


   51



            WITNESS the facsimile seal of the Company and facsimile signatures
of its duly authorized officers.

Dated:

                                    HARCOR ENERGY, INC.


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

Attest:


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


Certificate of Authentication:
This is one of the Warrants
referred to in the within
mentioned Warrant Agreement:

TEXAS COMMERCE BANK NATIONAL ASSOCIATION,
  as Warrant Agent


By:
    -----------------------------
    Authorized Signatory


                                       A-4


   52

                          [FORM OF WARRANT CERTIFICATE]

                                    [REVERSE]

                               HARCOR ENERGY, INC.

            The Warrants evidenced by this Warrant Certificate are part of a
duly authorized issue of Warrants, each of which represents the right to
purchase at any time on or after July 24, 1996, until 5:00 p.m., New York City
time, on July 24, 2000, one share of Common Stock of the Company, subject to
adjustment as set forth in the Warrant Agreement. The Warrants are issued
pursuant to a Warrant Agreement dated as of July 24, 1995 (the "Warrant
Agreement"), duly executed and delivered by the Company to Texas Commerce Bank
National Association, as Warrant Agent (the "Warrant Agent"), which Warrant
Agreement is hereby incorporated by reference in and made a part of this
instrument and is hereby referred to for a description of the rights, limitation
of rights, obligations, duties and immunities thereunder of the Warrant Agent,
the Company and the holders (the words "holders" or "holder" meaning the
registered holders or registered holder) of the Warrants. Warrants may be
exercised by (i) surrendering at any Warrant Agent Office this Warrant
Certificate with the form of Election to Exercise set forth hereon duly
completed and executed and (ii) paying in full the Warrant Exercise Price for
each such Warrant exercised and any other amounts required to be paid pursuant
to the Warrant Agreement.

            If all of the items referred to in the last sentence of the
preceding paragraph are received by the Warrant Agent at or prior to 2:00 p.m.,
New York City time, on a Business Day, the exercise of the Warrant to which such
items relate will be effective on such Business Day. If any items referred to in
the last sentence of the preceding paragraph are received after 2:00 p.m., New
York City time, on a Business Day, the exercise of the Warrants to which such
item relates will be deemed to be effective on the next succeeding Business Day.
Notwithstanding the foregoing, in the case of an exercise of Warrants on the
Expiration Date, if all of the items referred to in the last sentence of the
preceding paragraph are received by the Warrant Agent at or prior to 5:00 p.m.,
New York City time, on such Expiration Date, the exercise of the Warrants to
which such items relate will be effective on the Expiration Date.

            Subject to the terms of the Warrant Agreement, as soon as
practicable after the exercise of any Warrant or Warrants, the Company shall
issue or cause to be issued to or upon the written order of the registered
holder of this Warrant Certificate, a certificate or certificates evidencing the
Share or

                                       A-5


   53

Shares to which such holder is entitled, in fully registered form, registered in
such name or names as may be directed by such holder pursuant to the Election to
Exercise, as set forth on the reverse of this Warrant Certificate. Such
certificate or certificates evidencing the Share or Shares shall be deemed to
have been issued and any persons who are designated to be named therein shall be
deemed to have become the holder of record of such Share or Shares as of the
close of business on the date upon which the exercise of this Warrant was deemed
to be effective as provided in the preceding paragraph.

            The Company will not be required to issue fractional shares of
Common Stock upon exercise of the Warrants or distribute Share certificates that
evidence fractional shares of Common Stock. In lieu of fractional shares of
Common Stock, there shall be paid to the registered Holder of this Warrant
Certificate at the time such Warrant Certificate is exercised an amount in cash
equal to the same fraction of the Current Market Value per share as determined
in accordance with the Warrant Agreement.

            Warrant Certificates, when surrendered at any office or agency
maintained by the Company for that purpose by the registered holder thereof in
person or by legal representative or attorney duly authorized in writing, may be
exchanged for a new Warrant Certificate or new Warrant Certificates evidencing
in the aggregate a like number of Warrants, in the manner and subject to the
limitations provided in the Warrant Agreement, without charge except for any tax
or other governmental charge imposed in connection therewith.

            Upon due presentment for registration of transfer of this Warrant
Certificate at any office or agency maintained by the Company for that purpose,
a new Warrant Certificate evidencing in the aggregate a like number of Warrants
shall be issued to the transferee in exchange for this Warrant Certificate,
subject to the limitations provided in the Warrant Agreement, without charge
except for any tax or other governmental charge imposed in connection therewith.

            The Company and the Warrant Agent may deem and treat the registered
holder hereof as the absolute owner of this Warrant Certificate (notwithstanding
any notation of ownership or other writing hereon made by anyone) for the
purpose of any exercise hereof and for all other purposes, and neither the
Company nor the Warrant Agent shall be affected by any notice to the contrary.

            The term "Business Day" shall mean any day on which (i) banks in New
York City, (ii) the principal national 

                                       A-6


   54

securities exchange or market on which the Common Stock is listed or admitted to
trading and (iii) the principal national securities exchange or market on which
the Warrants are listed or admitted to trading are open for business.


                                       A-7


   55


                         (FORM OF ELECTION TO EXERCISE)

(To be executed upon exercise of Warrants on the Exercise Date)


            The undersigned hereby irrevocably elects to exercise _____ of the
Warrants represented by this Warrant Certificate and purchase the whole number
of Shares issuable upon the exercise of such Warrants and herewith tenders
payment for such Shares in the amount of $_________ in cash or by certified or
official bank check, in accordance with the terms hereof. The undersigned
requests that a certificate representing such Shares be registered in the name
of ______________________ whose address is _____________________________ and
that such certificate be delivered to ___________________________ whose address
is __________________________. Any cash payments to be paid in lieu of a
fractional Share should be made to __________________ whose address is
________________________ and the check representing payment thereof should be
delivered to ______________________ whose address is ______________________.

            Dated __________________, 19__

            Name of holder of
            Warrant Certificate:  _______________________________
                                          (Please Print)

            Tax Identification or
            Social Security Number:  ____________________________

            Address:  ___________________________________________

                      ___________________________________________

            Signature:  _________________________________________
                        Note:   The above signature must corre-
                                pond with the name as written
                                upon the face of this Warrant
                                Certificate in every particular,
                                without alteration or
                                enlargement or any change
                                whatever.

Dated ____________________, 19__



                                       A-8


   56



                              [FORM OF ASSIGNMENT]

            For value received _______________________ hereby sells, assigns and
transfers unto _____________________ the within Warrant Certificate, together
with all right, title and interest therein, and does hereby irrevocably
constitute and appoint __________________________ attorney, to transfer said
Warrant Certificate on the books of the within-named Company, with full power of
substitution in the premises.

Dated ____________________, 199__

            Signature:  ________________________________________
                        Note:   The above signature must corre-
                                spond with the name as written
                                upon the face of this Warrant
                                Certificate in every particular,
                                without alteration or
                                enlargement or any change
                                whatever.


                                       A-9


   57



              SCHEDULE OF EXCHANGES OF CERTIFICATED WARRANTS(2)


The following exchanges of a part of this Global Warrant for certificated
Warrants have been made:



                                                  Number of
                                                  Warrants of
            Amount of           Amount of         this Global
            decrease in         increase in       Warrant         Signature of
            Number of           Number of         following       authorized
Date of     Warrants of this    Warrants of this  such decrease   officer of
Exchange    Global Warrant      Global Warrant    (or increase)   Warrant Agent
- --------------------------------------------------------------------------------
                                                      







- -------------------------
(2)      This is to be included only if the Warrant is in global form.


                                      A-10


   58



                                                                       EXHIBIT B



             CERTIFICATE TO BE DELIVERED UPON EXCHANGE
              OR REGISTRATION OF TRANSFER OF WARRANTS


Re:  Warrants to Purchase Common Stock (the "Warrants")
     of HarCor Energy, Inc.

            This Certificate relates to ____ Warrants held in* ___ book-entry
or* _______ certificated form by ______ (the "Transferor").

The Transferor:*
     
      / /   has requested the Warrant Agent by written order to deliver in
exchange for its beneficial interest in the Global Warrant held by the
Depositary a Warrant or Warrants in definitive, registered form of authorized
denominations and an aggregate number equal to its beneficial interest in such
Global Warrant (or the portion thereof indicated above); or
     
      / /   has requested the Warrant Agent by written order to exchange or
register the transfer of a Warrant or Warrants.

            In connection with such request and in respect of each such Warrant,
the Transferor does hereby certify that the Transferor is familiar with the
Warrant Agreement relating to the above captioned Warrants and the restrictions
on transfers thereof as provided in Section 1.08 of such Warrant Agreement, and
that the transfer of this Warrant does not require registration under the
Securities Act of 1933, as amended (the "Act") because[*]:
      
      / /   Such Warrant is being acquired for the Transferor's own account,
without transfer (in satisfaction of Section 1.08(a)(y)(A) or Section
1.08(d)(i)(A) of the Warrant
Agreement).
      
      / /   Such Warrant is being transferred to a qualified institutional buyer
(as defined in Rule 144A under the Act), in reliance on Rule 144A or in
accordance with Regulation S under the Act.
      
      / /   Such Warrant is being transferred in accordance with Rule 144 under
the Act.



                                       B-1


   59



      
      / /   Such Warrant is being transferred in reliance on and in compliance
with an exemption from the registration requirements of the Act, other than Rule
144A or Rule 144 or Regulation S under the Act. An opinion of counsel to the
effect that such transfer does not require registration under the Act
accompanies this Certificate.


                                    _______________________________
                                    [INSERT NAME OF TRANSFEROR]

                                    By:   _________________________

Date:  _____________
       *Check applicable box.



                                       B-2


   60



                                                                       EXHIBIT C



                       Transferee Letter of Representation

HarCor Energy, Inc.
Five Post Oak Park
4400 Post Oak Parkway
Suite 2220
Houston, Texas  77027-3413

Ladies and Gentlemen:

            In connection with our proposed purchase of warrants to purchase
Common Stock, par value $.10 per share, (the "Securities") of HarCor Energy,
Inc. (the "Company") we confirm that:

            1. We understand that the Securities have not been registered under
      the Securities Act of 1933, as amended (the "Securities Act") and, unless
      so registered, may not be sold except as permitted in the following
      sentence. We agree on our own behalf and on behalf of any investor account
      for which we are purchasing Securities to offer, sell or otherwise
      transfer such Securities prior to the date which is three years after the
      later of the date of original issue and the last date on which the Company
      or any affiliate of the Company was the owner of such Securities, or any
      predecessor thereto (the "Resale Restriction Termination Date") only (a)
      to the Company, (b) pursuant to a registration statement which has been
      declared effective under the Securities Act, (c) so long as the Securities
      are eligible for resale pursuant to Rule 144A, under the Securities Act,
      to a person we reasonably believe is a qualified institutional buyer under
      Rule 144A (a "QIB") that purchases for its own account or for the account
      of a QIB and to whom notice is given that the transfer is being made in
      reliance on Rule 144A, (d) pursuant to offers and sales that occur outside
      the United States within the meaning of Regulation S under the Securities
      Act, (e) to an institutional "accredited investor" within the meaning of
      subparagraph (a)(1), (2), (3) or (7) of Rule 501 under the Securities Act
      that is purchasing for his own account or for the account of such an
      institutional "accredited investor," or (f) pursuant to any other
      available exemption from the registration requirements of the Securities
      Act, subject in each of the foregoing cases to any requirement of law that
      the disposition of our property or the property of such investor account
      or accounts be at

                                       C-1


   61



      all times within our or their control and to compliance with any
      applicable state securities laws. The foregoing restrictions on resale
      will not apply subsequent to the Resale Restriction Termination Date. If
      any resale or other transfer of the Securities is proposed to be made
      pursuant to clause (e) above prior to the Resale Restriction Termination
      Date, the transferor shall deliver a letter from the transferee
      substantially in the form of this letter to the warrant agent under the
      Warrant Agreement pursuant to which the Securities were issued (the
      "Warrant Agent") which shall provide, among other things, that the
      transferee is an institutional "accredited investor" within the meaning of
      subparagraph (a)(1), (2), (3) or (7) of Rule 501 under the Securities Act
      and that it is acquiring such Securities for investment purposes and not
      for distribution in violation of the Securities Act. The Warrant Agent and
      the Company reserve the right prior to any offer, sale or other transfer
      prior to the Resale Restriction Termination Date of the Securities
      pursuant to clause (e) or (f) above to require the delivery of a written
      opinion of counsel, certifications, and or other information satisfactory
      to the Company and the Warrant Agent.

            2. We are an institutional "accredited investor" (as defined in Rule
      501(a)(1), (2), (3) or (7) of Regulation D under the Securities Act)
      purchasing for our own account or for the account of such an institutional
      "accredited investor," and we are acquiring the Securities for investment
      purposes and not with a view to, or for offer or sale in connection with,
      any distribution in violation of the Securities Act and we have such
      knowledge and experience in financial and business matters as to be
      capable of evaluating the merits and risks of our investment in the
      Securities, and we and any accounts for which we are acting are each able
      to bear the economic risk of our or its investment for an indefinite
      period.

            3. We are acquiring the Securities purchased by us for our own
      account or for one or more accounts as to each of which we exercise sole
      investment discretion.

            4. You, the Warrant Agent and your respective counsel are entitled
      to rely upon this letter and you are irrevocably authorized to produce
      this letter or a copy hereof to any interested party in any administrative
      or legal proceeding or official inquiry with respect to the matters
      covered hereby.

                                                 Very truly yours,



                                       C-2
   62

                                                 ______________________________ 
                                                 (Name of Purchaser)


                                                 By:___________________________

                                                 Date:_________________________

            Upon transfer the Securities would be registered in the name of the
new beneficial owner as follows:

Name:______________________________

Address:___________________________

Taxpayer ID Number:________________



                                       C-3