Document:

<PAGE>

                                 EXHIBIT 10.3

                        [LADENBURG THALMANN LETTERHEAD]

                                                   February 14, 2000

Paul H. Metzinger
President,Chief Executive Officer
Nanopierce Technologies, Inc.
370-17th Street, Suite 3580
Denver, CO 80202

Dear Mr. Metzinger:

The purpose of this letter agreement (the "Agreement") is to set forth the terms
and conditions pursuant to which Ladenburg Thalmann & Co. Inc. ("LTCO") shall
serve as exclusive placement agent in connection with the proposed offering (the
"Offering") of securities (the "Securities") of Nanopierce Technologies, Inc.
(the "Company").  The gross proceeds from the Offering will be up to
$30,000,000. All references to dollars shall be to U.S. dollars. The terms of
such Offering and the Securities shall be substantially in the form set forth in
Exhibit D hereto, which exhibit is incorporated by reference herein.

     Upon the terms and subject to the conditions of this Agreement, the parties
hereto agree as follows:

     1.  Appointment.  (a) Subject to the terms and conditions of this Agreement
         ------------
hereinafter set forth, the Company hereby retains LTCO, and LTCO hereby agrees
to act as the Company's exclusive placement agent and financial advisor in
connection with the Offering, effective as of the date hereof. The Company
expressly acknowledges and agrees that LTCO's obligations hereunder are on a
reasonable best efforts basis only and that the execution of this Agreement does
not constitute a commitment by LTCO to purchase the Securities and does not
ensure the successful placement of the Securities or any portion thereof or the
success of LTCO with respect to securing any other financing on behalf of the
Company.

     (b) Except as set forth below in this Section 1, during the effectiveness
of this Agreement, neither the Company nor any of its subsidiaries or affiliates
shall, directly or indirectly, through any officer, director, employee, agent or
otherwise (including, without limitation, through any placement agent, broker,
investment banker, attorney or accountant retained by the Company or any of its
<PAGE>

subsidiaries or affiliates), solicit, initiate or encourage the submission of
any proposal or offer (an "Investment Proposal") from any person or entity
(including any of such person's or entity's officers, directors, employees,
agents and other representatives) relating to any issuance of the Company's or
any of its subsidiaries' equity securities (including debt securities with any
equity feature) or relating to any other transaction having a similar effect or
result on the Company's or any of its subsidiaries' capitalization, or
participate in any discussions or negotiations regarding, or furnish to any
other person or entity any information with respect to, or otherwise cooperate
in any way with, or assist or participate in, facilitate or encourage any effort
or attempt by any other person or entity to do or seek to do any of the
foregoing.  The Company shall immediately cease and cause to be terminated any
and all contacts, discussions and negotiations with third parties regarding any
Investment Proposal.  The Company shall promptly notify LTCO if any such
Investment Proposal, or any inquiry or contact with any person or entity with
respect thereto, is made.  The Company shall not provide or release any
information with respect to this Agreement or the Offering except as required by
law.

     2.  Fees and Compensation.  In consideration of the services rendered by
         ----------------------
LTCO in connection with the Offering, the Company agrees to pay LTCO the
following fees and other compensation:
          (a)  1)  a commitment fee payable immediately upon the initial closing
                   equal to 1% of the total draw down commitment amount; and
               2)  an additional fee payable upon the initial and each
                   subsequent closing equal to 7% of the amount drawn down by
                   the Company at each such closing.
          (b)  $35,000 non-accountable expense allowance ($17,500 shall be paid
               upon execution of this Letter Agreement by the Company and the
               balance of $17,500 upon the initial closing).
          (c)  8% Warrant Coverage.
          (d)  All amounts payable hereunder shall be paid to LTCO out of an
               attorney escrow account at the closing or by such other means
               acceptable to LTCO.
          (e)  Should LTCO provide a qualified institutional investor acceptable
               to the Company and such investor is willing to invest at
               substantially the same terms outlined in the term sheet marked
               Exhibit D and the Company were to terminate the Agreement after
               February 8, 2000 or prior to March 7, 2002 (the "Termination
               Date"), for reasons other than a breach of this Agreement by
               LTCO, the Company will pay $200,000 to LTCO as a "break-up" fee.

     3.    Terms of Retention.    (a) Unless extended or terminated in writing
           -------------------
by the parties hereto in accordance with the provisions hereof, this Agreement
shall remain in effect until the Termination Date of March 7, 2002.

     (b) Notwithstanding anything herein to the contrary, the obligation to pay
the Fees and Compensation and Expenses described in Section 2, if any, and
paragraphs 2, 6, and 8 of Exhibit A and all of Exhibit B and Exhibit C attached
hereto, each of which exhibits is incorporated herein by reference, shall
survive

                                       2
<PAGE>

any termination or expiration of the Agreement.  It is expressly understood and
agreed by the parties hereto that any private financing of equity or debt or
other capital raising activity of the Company within 24 months of the
termination or expiration of this Agreement, with any investors or lenders to
whom the Company was introduced by LTCO or who was contacted by LTCO while this
Agreement was in effect and disclosed to the Company in writing, shall result in
such fees and compensation due and payable by the Company to LTCO under the same
terms of Section 2 above. Upon completion of the Offering, any future
renegotiating, restructuring, revision or other amendment of such Offering by
and between the Company and the investors in such Offering shall be deemed to be
a new financing and shall result in additional fees and compensation due and
payable by the Company to LTCO under the terms of Section 2 above.

     4.  Right of First Refusal.   Upon completion of the Offering, LTCO shall
         -----------------------
have an irrevocable right of first refusal for a period of one year to provide
all private financing arrangements for the Company (other than conventional
banking arrangements, borrowing and commercial debt financing and discrete
unrelated transactions of not more than $250,000 where no investment banking fee
is being paid).  LTCO shall exercise such right in writing within five (5)
business days of receipt of a written term sheet describing such proposed
transaction in reasonable detail.

     5.  Information.     The Company recognizes and confirms that in completing
         ------------
its engagement hereunder, LTCO will be using and relying on publicly available
information and on data, material and other information furnished to LTCO by the
Company or the Company's affiliates and agents.  It is understood and agreed
that in performing under this engagement, LTCO will rely upon the accuracy and
completeness of, and is not assuming any responsibility for independent
verification of, such publicly available information and the other information
so furnished.

          6.  Offers and Sales Only to Institutional Accredited Investors.
              -----------------------------------------------------------
Offers and sales of the Securities will be made only to qualified institutional
buyers (as defined in Rule 144A) and to "accredited investors" as defined in
Rule 501(a) promulgated under the Securities Act of 1933, as amended (the
"Securities Act").

     7.  No General Solicitation. The Securities will be offered only by
         -----------------------
approaching prospective purchasers on an individual basis. No general
solicitation or general advertising in any form will be used in connection with
the offering of the Securities.

     8.    Miscellaneous.  This Agreement constitutes the entire understanding
           --------------
and agreement between the parties with respect to its subject matter and there
are no agreements or understandings with respect to the subject matter hereof
which are not contained in this Agreement.  This Agreement may be modified only
in writing signed by the party to be charged hereunder.

                                       3
<PAGE>

          If the foregoing correctly sets forth our agreement, please confirm
this by signing and returning to us the duplicate copy of this letter.

          We appreciate this opportunity to be of service and are looking
forward to working with you on this matter.

                         Very truly yours,

                         LADENBURG THALMANN & CO. INC.

                         By:  David Burns
                              -----------
                              Name: David Burns
                              Title: EVP

Agreed to and accepted
as of the date first written above:

NANOPIERCE TECHNOLOGIES, INC.

By:  /s/ Paul H. Metzinger
     ---------------------
     Name:  Paul H. Metzinger
     Title:  President & CEO

                                       4
<PAGE>

                                                                       EXHIBIT A
                                                                       ---------

                         STANDARD TERMS AND CONDITIONS

1.   The Company shall promptly provide LTCO with all relevant information about
     the Company (to the extent available to the Company in the case of parties
     other than the Company) that shall be reasonably requested or required by
     LTCO, which information shall be accurate in all material respects at the
     time furnished.

2.   LTCO shall keep all information obtained from the Company strictly
     confidential except:  (a) information which is otherwise publicly
     available, or  previously known to, or obtained by LTCO independently of
     the Company and without breach of LTCO's agreement with the Company;  (b)
     LTCO may disclose such information to its employees and attorneys, and to
     its other advisors and financial sources on a need to know basis only and
     shall ensure that all such employees, attorneys, advisors and financial
     sources will keep such information strictly confidential; and (c) pursuant
     to any order of a court of competent jurisdiction or other governmental
     body or as may otherwise be required by law.

3.   The Company recognizes that in order for LTCO to perform properly its
     obligations in a professional manner, it is necessary that LTCO be informed
     of and, to the extent practicable, participate in meetings and discussions
     between the Company and any third party relating to the matters covered by
     the terms of LTCO's engagement.

4.   The Company agrees that any report or opinion, oral or written, delivered
     to it by LTCO is prepared solely for its confidential use and shall not be
     reproduced, summarized, or referred to in any public document or given or
     otherwise divulged to any other person without LTCO's prior written
     consent, except as may be required by applicable law or regulation.

5.   No fee payable to LTCO pursuant to any other agreement with the Company or
     payable by the Company to any agent, lender or investor shall reduce or
     otherwise affect any fee payable by the Company to LTCO hereunder.

6.   The Company represents and warrants that: (a) it has full right, power and
     authority to enter into this Agreement and to perform all of its
     obligations hereunder;  (b) this Agreement has been duly authorized and
     executed and constitutes a valid and binding agreement of the Company
     enforceable in accordance with its terms; and (c) the execution and
     delivery of this Agreement and the consummation of the transactions
     contemplated hereby does not conflict with or result in a breach of (i) the
     Company's certificate of incorporation or by-laws or (ii) any agreement to
     which the Company is a party or by which any of its property or assets is
     bound.

                                       5
<PAGE>

                                                           EXHIBIT A (CONTINUED)
                                                           ---------------------

7.   Nothing contained in this Agreement shall be construed to place LTCO and
     the Company in the relationship of partners or joint venturers. Neither
     LTCO nor the Company shall represent itself as the agent or legal
     representative of the other for any purpose whatsoever nor shall either
     have the power to obligate or bind the other in any manner whatsoever.
     LTCO, in performing its services hereunder, shall at all times be an
     independent contractor.

8.   This Agreement has been and is made solely for the benefit of LTCO and the
     Company and each of the persons, agents, employees, officers, directors and
     controlling persons referred to in Exhibit B and their respective heirs,
     executors, personal representatives, successors and assigns, and nothing
     contained in this Agreement shall confer any rights upon, nor shall this
     Agreement be construed to create any rights in, any person who is not party
     to such Agreement, other than as set forth in this paragraph.

9.   The rights and obligations of either party under this Agreement may not be
     assigned without the prior written consent of the other party hereto and
     any other purported assignment shall be null and void.

10.  All communications hereunder, except as may be otherwise specifically
     provided herein, shall be in writing and shall be mailed, hand delivered,
     or sent via facsimile and confirmed by letter, to the party to whom it is
     addressed at the following addresses or such other address as such party
     may advise the other in writing:

               To the Company:
               Paul H. Metzinger
               Nanopierce Technologies, Inc.
               370 - 17th Street, Suite 3580
               Denver, CO 80202
               Telephone: (303) 592-1010
               Facsimile:  (303) 592-1054

               To LTCO:
               Ladenburg Thalmann & Co. Inc.
               590 Madison Avenue
               New York, NY 10022
               Attention:  David B. Boris
               Telephone:  (212) 409-2000
               Facsimile:  (212) 409-2169

All notices hereunder shall be effective upon receipt by the party to which it
is addressed.

                                       6
<PAGE>

                                                                       EXHIBIT B
                                                                       ---------

                                INDEMNIFICATION

  The Company agrees that it shall indemnify and hold harmless, LTCO, its
stockholders, directors, officers, employees, agents, affiliates and controlling
persons within the meaning of Section 20 of the Securities Exchange Act of 1934
and Section 15 of the Securities Act of 1933, each as amended (any and all of
whom are referred to as an "Indemnified Party"), from and against any and all
losses, claims, damages, liabilities, or expenses, and all actions in respect
thereof (including, but not limited to, all legal or other expenses reasonably
incurred by an Indemnified Party in connection with the investigation,
preparation, defense or settlement of any claim, action or proceeding, whether
or not resulting in any liability), incurred by an Indemnified Party:  (a)
arising out of, or in connection with, any actions taken or omitted to be taken
by the Company, its affiliates, employees or agents, or any untrue statement or
alleged untrue statement of a material fact contained in any of the financial or
other information furnished to LTCO by or on behalf of the Company or the
omission or alleged omission of a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading; or (b) with respect to, caused by, or
otherwise arising out of any transaction contemplated by the Agreement or LTCO's
performing the services contemplated hereunder; provided, however, the Company
                                                --------  -------
will not be liable under clause (b) hereof to the extent, and only to the
extent, that any loss, claim, damage, liability or expense is  finally
judicially determined to have resulted primarily from LTCO's gross negligence or
bad faith in performing such services.

  If the indemnification provided for herein is conclusively determined (by an
entry of final judgment by a court of competent jurisdiction and the expiration
of the time or denial of the right to appeal) to be unavailable or insufficient
to hold any  Indemnified Party harmless in respect to any losses, claims,
damages, liabilities or expenses referred to therein, then the Company shall
contribute to the amounts paid or payable by such Indemnified Party in such
proportion as is appropriate and equitable under all circumstances taking into
account the relative benefits received by the Company on the one hand and LTCO
on the other, from the transaction or proposed transaction under the Agreement
or, if allocation on that basis is not permitted under applicable law, in such
proportion as is appropriate to reflect not only the relative benefits received
by the Company on the one hand and LTCO on the other, but also the relative
fault of the Company and LTCO; provided, however, in no event shall the
                               --------  -------
aggregate contribution of LTCO and/or any Indemnified Party be in excess of net
compensation actually received by LTCO and/or such Indemnified Party pursuant to
this Agreement.

  The Company shall not settle or compromise or consent to the entry of any
judgment in or otherwise seek to terminate any pending or threatened action,
claim, suit or proceeding in which any Indemnified Party is or could be a party
and as to which indemnification or contribution could have been sought by such
Indemnified Party hereunder (whether or not such Indemnified Party is a party
thereto), unless such consent or termination includes an express unconditional
release of such Indemnified Party, reasonably satisfactory in form and substance
to such

                                       7
<PAGE>

Indemnified Party, from all losses, claims, damages, liabilities or expenses
arising out of such action, claim, suit or proceeding.

  The foregoing indemnification and contribution provisions are not in lieu of,
but in addition to, any rights which any Indemnified Party may have at common
law hereunder or otherwise, and shall remain in full force and effect following
the expiration or termination of LTCO's engagement and shall be binding on any
successors or assigns of the Company and successors or assigns to all or
substantially all of the Company's business or assets.

                                       8
<PAGE>

                                                                       EXHIBIT C
                                                                       ---------

                                 JURISDICTION

  The Company hereby irrevocably: (a) submits to the jurisdiction of any court
of the State of New York or any federal court sitting in the State of New York
for the purposes of any suit, action or other proceeding arising out of the
Agreement between the Company and LTCO which is brought by or against the
Company or LTCO; (b) agrees that all claims in respect of any suit, action or
proceeding may be heard and determined in any such court; and (c) to the extent
that the Company has acquired, or hereafter may acquire, any immunity from
jurisdiction of any such court or from any legal process therein, the Company
hereby waives, to the fullest extent permitted by law, such immunity.

  The Company waives, and the Company agrees not to assert in any such suit,
action or proceeding, in each case, to the fullest extent permitted by
applicable law, any claim that: (a) the Company is not personally subject to the
jurisdiction of any such court; (b) the Company is immune from any legal process
(whether through service or notice, attachment prior to judgment, attachment in
the aid of execution, execution or otherwise) with respect to it or its
property; (c) any such suit, action or proceeding is brought in an inconvenient
forum; (d) the venue of any such suit, action or proceeding is improper; or (e)
this Agreement may not be enforced in or by any such court.

  Any process against the Company in, or in connection with, any suit, action or
proceeding filed in the United States District Court for the Southern District
of New York or any other court of the State of New York, arising out of or
relating to this Agreement or any transaction or agreement contemplated hereby,
may be served personally, or by first class mail or overnight courier (with the
same effect as though served upon the Company personally) addressed to the
Company at the address set forth in the Agreement between the Company and LTCO.

  Nothing in these provisions shall affect any party's right to serve process in
any manner permitted by law or limit its rights to bring a proceeding in the
competent courts of any jurisdiction or jurisdictions or to enforce in any
lawful manner a judgment obtained in one jurisdiction in any other jurisdiction.

  This Agreement shall be governed by and construed in accordance with the laws
of the State of New York, without regard to conflicts of law principles.

                                       9<PAGE>

                                                                  EXHIBIT 10.1.2

        FIRST AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT
        ---------------------------------------------------------------

     This First Amendment to Second Amended and Restated Credit Agreement (this
First Amendment) is executed as of the 25th day of October, 1999, by and among
---------------
Patina Oil & Gas Corporation, a Delaware Corporation (Borrower), Chase Bank of
                                                      --------
Texas, National Association, as Administrative Agent (Administrative Agent), and
                                                      --------------------
the financial institutions parties hereto as Banks (individually a Bank and
                                                                   ----
collectively Banks).
             -----

                                 W I T N E S E T H:
                                 - - - - - - - - -

     WHEREAS, Borrower, Administrative Agent and Banks are parties to that
certain Second Amended and Restated Credit Agreement dated as of July 15, 1999
(as amended, the Credit Agreement) (unless otherwise defined herein, all terms
                 ----------------
used herein with their initial letter capitalized shall have the meaning given
such terms in the Credit Agreement); and

     WHEREAS, pursuant to the Credit Agreement, Banks have made a revolving
credit loan to Borrower; and

     WHEREAS, Borrower has (a) notified Administrative Agent and Banks that
effective  October 25, 1999 Borrower redeemed 623,000 shares of its Original
Preferred Stock, 457,000 shares of which were redeemed for $12,000,000 in cash,
and (b) requested that the Credit Agreement be amended to revise Section 10.2
thereof as set forth herein in connection therewith; and

     WHEREAS, Borrower and Banks desire to set forth herein the amount of the
Borrowing Base for the period commencing on November 1, 1999 and continuing
until the next succeeding Determination Date.

     NOW THEREFORE, for and in consideration of the mutual covenants and
agreements herein contained and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged and confessed,
Borrower, Administrative Agent and each Bank hereby agree as follows:

     SECTION 1.  Amendments.  In reliance on the representations, warranties,
     ---------   ----------
covenants and agreements contained in this First Amendment and subject to the
terms and conditions set forth herein, the Credit Agreement shall be amended
effective as of the date hereof in the manner provided in this Section 1.
                                                               ---------

     1.1. Amendment to Definition.  The definition of Loan Papers contained in
          -----------------------                     -----------
Section 2.1 of the Credit Agreement shall be amended to read in full as follows:

          Loan Papers means this Agreement, the First Amendment, the Notes, each
          -----------
     Restricted Subsidiary Guarantee now or hereafter executed, each Restricted
     Subsidiary Pledge Agreement now or hereafter executed, all Mortgages now or
     at any time hereafter delivered pursuant to Section 6.1, the Collateral
                                                 -----------
     Assignment, and all other certificates, documents or instruments delivered
     in connection with this Agreement, as the foregoing may be amended from
     time to time.

                                       1
<PAGE>

     1.2. Additional Definitions.  Section 2.1 of the Credit Agreement shall be
          ----------------------
amended to add the following definitions to such Section:

          First Amendment means the First Amendment to Second Amended and
          ---------------
     Restated Credit Agreement dated as of October 25, 1999, entered into by and
     among Borrower, Administrative Agent and Banks.

          Qualified Redemption means a one-time redemption by Borrower of
          --------------------
     623,000 shares of the Original Preferred Stock, of which (i) 166,000 shares
     are converted into 482,000 shares of Common Stock, and (ii) 457,000 shares
     are redeemed for $12,000,000 in cash, and which redemption shall (a) be
     pursuant to a Redemption Notice delivered by Borrower not more than ninety
     (90) days and not less than thirty (30) days prior to October 25, 1999, and
     (b) be effective October 25, 1999.

          Redemption Notice means a notice by Borrower to the holders of the
          -----------------
     Original Preferred Stock, pursuant to which Borrower calls 623,000 shares
     of such Original Preferred Stock for redemption.

     1.3. Amendment to Restricted Payments Covenant.  Section 10.2 of the
          -----------------------------------------
Credit Agreement shall be amended to read in full as follows:

          SECTION 10.2.   Restricted Payments.  Neither Borrower nor any
                          -------------------
          Restricted Subsidiary of Borrower will declare or make any Restricted
          Payment; provided, that, so long as no Default, Event of Default or
                   --------  ----
          Borrowing Base Deficiency then exists, and provided that no Default or
          Event of Default would result therefrom, Borrower shall be permitted
          to (a) declare and pay accrued dividends on the Preferred Stock and
          the Common Stock, (b) repurchase any of its Common Stock or Preferred
          Stock or warrants, options or other rights to acquire such Common
          Stock or Preferred Stock, so long as, at any date, the sum of (y) the
          aggregate amount of all such dividends declared and paid pursuant to
          clause (a) above during the period commencing on April 1, 1999 to and
          including such date, plus (z) the aggregate amount paid by Borrower
          and its Restricted Subsidiaries in respect of the repurchase of all
          such Common Stock or Preferred Stock or warrants, options or other
          rights to acquire such Common Stock or Preferred Stock pursuant to
          clause (b) above, shall not exceed the Restricted Payment Limit in
          effect at such date, and (c) notwithstanding anything to the contrary
          contained herein, consummate and effectuate the Qualified Redemption,
          which such Qualified Redemption shall not impact or be counted against
          the Restricted Payment Limit.

     SECTION 2.  Borrowing Base.  In accordance with Article V of the Credit
     ---------   --------------
Agreement, effective November 1, 1999, and continuing until the next
Determination Date, the Borrowing Base shall be $175,000,000.

     SECTION 3.  Consent.  Notwithstanding anything to the contrary contained in
     ---------   -------
the Credit Agreement or in any other Loan Paper, Banks hereby (a) consent to the
consummation of the Qualified Redemption, and (b) waive any inconsistent
provisions of the Credit Agreement,

                                       2
<PAGE>

including, without limitation, Section 10.2 thereof, with respect to the
consummation of such Qualified Redemption. The consent and waiver herein
contained are expressly limited as follows: (i) such consent and waiver are
limited solely to the consummation of the Qualified Redemption, (ii) such
consent and waiver shall not be applicable to any provision of any Loan Paper
other than Section 10.2 of the Credit Agreement, and (iii) such consent and
waiver are each a limited, one-time consent and waiver, and nothing contained
herein shall obligate Banks to grant any additional or future consent or waiver
of, or with respect to, Section 10.2 of the Credit Agreement or any other
provision of any Loan Paper.

     SECTION 4.  Representations and Warranties.  In order to induce
     ---------   ------------------------------
Administrative Agent and Banks to enter into this First Amendment, Borrower
hereby represents and warrants to Administrative Agent and each Bank that:

     4.1. Accuracy of Representations and Warranties.  Each representation and
          ------------------------------------------
warranty of Borrower and its Subsidiaries contained in the Loan Papers are true
and correct in all material respects as of the date hereof (except to the extent
that such representations and warranties are expressly made as of a particular
date, in which event such representations and warranties were true and correct
as of such date);

     4.2. Absence of Defaults.  Neither a Default nor an Event of Default has
          -------------------
occurred which is continuing; and

     4.3. No Defense.  Borrower has no defenses to payment, counterclaims or
          ----------
rights of set-off with respect to the Obligations on the date hereof.

     SECTION 5.  Miscellaneous.
     ---------   -------------

     5.1. Reaffirmation of Loan Papers; Extension of Liens.  Any and all of the
          ------------------------------------------------
terms and provisions of the Credit Agreement and the Loan Papers shall, except
as amended and modified hereby, remain in full force and effect.  Borrower
hereby extends the Liens securing the Obligations until the Obligations have
been paid in full, and agrees that the amendments and modifications herein
contained shall in no manner affect or impair the Obligations or the Liens
securing payment and performance thereof.

     5.2. Parties in Interest.  All of the terms and provisions of this First
          -------------------
Amendment shall bind and inure to the benefit of the parties hereto and their
respective successors and assigns.

     5.3. Counterparts.  This First Amendment may be executed in counterparts,
          ------------
and all parties need not execute the same counterpart; however, no party shall
be bound by this First Amendment until this First Amendment has been executed by
Borrower, Administrative Agent and all Banks at which time this First Amendment
shall be binding on, enforceable against and inure to the benefit of Borrower,
Administrative Agent and all Banks.  Facsimiles shall be effective as originals.

     5.4. COMPLETE AGREEMENT.  THIS FIRST AMENDMENT, THE CREDIT AGREEMENT AND
          ------------------
THE OTHER LOAN PAPERS REPRESENT THE FINAL AGREEMENT AMONG THE PARTIES AND MAY
NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,

                                       3
<PAGE>

CONTEMPORANEOUS OR ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL
AGREEMENTS BETWEEN THE PARTIES.

     5.5. Headings.  The headings, captions and arrangements used in this First
          --------
Amendment are, unless specified otherwise, for convenience only and shall not be
deemed to limit, amplify or modify the terms of this First Amendment, nor affect
the meaning thereof.

     5.6. Legal Expenses.  Borrower hereby agrees to pay on demand all
          --------------
reasonable fees and expenses of counsel to Administrative Agent incurred by
Administrative Agent in connection with the preparation, negotiation and
execution of this First Amendment and all related documents.

     IN WITNESS WHEREOF, the parties hereto have caused this First Amendment to
be duly executed by their respective Authorized Officers on the date and year
first above written.

                                 [Signature Pages Follow]

                                       4
<PAGE>

SIGNATURE PAGE TO FIRST AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT
AGREEMENT DATED AS OF NOVEMBER 1, 1999, BY AND AMONG PATINA OIL & GAS
CORPORATION, AS BORROWER, THE FINANCIAL INSTITUTIONS PARTIES THERETO, AS BANKS,
AND CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, AS ADMINISTRATIVE AGENT

                                    PATINA OIL & GAS CORPORATION

                                    By: /s/ David J. Kornder
                                        --------------------------------------
                                        David J. Kornder, Vice President and
                                        Chief Financial Officer

                                    CHASE BANK OF TEXAS, NATIONAL
                                    ASSOCIATION, as Administrative Agent

                                    By: /s/ Dale S. Hurd
                                        --------------------------------------
                                        Dale S. Hurd, Managing Director

                                    CHASE BANK OF TEXAS, NATIONAL
                                    ASSOCIATION, as a Bank

                                    By: /s/ Dale S. Hurd
                                        --------------------------------------
                                        Dale S. Hurd, Managing Director

                                    BANK OF AMERICA, N.A., as a Bank

                                    By: /s/ J. Scott Fowler
                                        --------------------------------------
                                        J. Scott Fowler, Managing Director

                                    BANK ONE, NA
                                    (MAIN OFFICE - CHICAGO) as a Bank
                                    (FORMERLY KNOWN AS THE FIRST
                                    NATIONAL BANK OF CHICAGO)

                                    By: /s/ Carl Skoog
                                        --------------------------------------
                                         Carl Skoog, Vice President

                                       5
<PAGE>

SIGNATURE PAGE TO FIRST AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT
AGREEMENT DATED AS OF NOVEMBER 1, 1999, BY AND AMONG PATINA OIL & GAS
CORPORATION, AS BORROWER, THE FINANCIAL INSTITUTIONS PARTIES THERETO, AS BANKS,
AND CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, AS ADMINISTRATIVE AGENT

                                    BANKERS TRUST COMPANY, as a Bank

                                    By: /s/ Calli S. Hayes
                                        --------------------------------------
                                        Calli S. Hayes, Managing Director

                                    CREDIT LYONNAIS NEW YORK BRANCH

                                    By: /s/ Phillipe Soustra
                                        --------------------------------------
                                        Phillipe Soustra, Senior Vice President

                                    FIRST UNION NATIONAL BANK

                                    By: /s/ Robert R. Wetteroff
                                        -------------------------------------
                                        Robert R. Wetteroff, Senior V.P.

                                    WELLS FARGO BANK, N.A.

                                    By: /s/ Greg Petruska
                                        -------------------------------------
                                        Greg Petruska, Vice President

                                       6

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