EXHIBIT 10.2 THIRD AMENDMENT TO CREDIT AGREEMENT THIS THIRD AMENDMENT TO CREDIT AGREEMENT dated effective as of October 20, 2004 (this "Third Amendment"), among ST. MARY LAND & EXPLORATION --------------- COMPANY, a Delaware corporation (the "Borrower"); the banks party hereto (the -------- "Lenders"); WACHOVIA BANK, NATIONAL ASSOCIATION, individually, as Issuing Bank ------- and as Administrative Agent (in such capacity, the "Administrative Agent"); BANK -------------------- ONE, NA and WELLS FARGO BANK, N.A., individually and as Co-Syndication Agents; and ROYAL BANK OF CANADA and COMERICA BANK, individually and as Co-Documentation Agents. R E C I T A L S: A. The Borrower, the Lenders, the Administrative Agent, the Co-Syndication Agents and the Co-Documentation Agents are parties to that certain Credit Agreement dated as of January 27, 2003 (as amended by First Amendment to Credit Agreement dated as of January 27, 2003, and as further amended by Second Amendment to Credit Agreement dated as of September 20, 2004, the "Credit Agreement"). ---------------- B. The parties hereto intend to amend the Credit Agreement to state an increase in the Borrowing Base but not in the Aggregate Commitment or Maximum Credit Amount. C. Therefore, in consideration of the mutual covenants and agreements contained herein and in the Credit Agreement, the parties hereto hereby agree as follows: SECTION 1. Amendments to Credit Agreement. ------------------------------ (a) The following terms, as defined in Section 1.02 of the Credit Agreement, are hereby amended in their entirety to read as follows: "Agreement" means this Credit Agreement, as amended by the --------- First Amendment, as further amended by the Second Amendment, as further amended by the Third Amendment, and as the same may be further amended, waived or otherwise modified from time to time in accordance herewith. "Aggregate Commitment" at any time means the aggregate amount -------------------- of the Commitments of all the Lenders, as reduced or increased from time to time pursuant to the terms hereof; provided that the Aggregate Commitment shall not at any time exceed the Maximum Credit Amount. The initial Aggregate Commitment is $150,000,000. "Borrowing Base" means at any time an amount equal to the -------------- amount determined in accordance with Section 2.07, as the same may be adjusted from time to time pursuant to Section 8.13(c), Section 9.12(a) or Section 9.13(e). "Maximum Credit Amount" means an amount equal to the lesser of --------------------- (a) the then effective Borrowing Base or (b) $300,000,000. 1(b) Section 1.02 of the Credit Agreement is hereby further amended by adding thereto the following new definitions in their appropriate alphabetical order: "Third Amendment" means that certain Third Amendment to Credit --------------- Agreement dated effective as of October 20, 2004, among the Borrower, the Lenders party thereto, the Administrative Agent and the Issuing Bank. "Third Amendment Effective Date" means October 20, 2004. ------------------------------ (c) Section 2.07(a) of the Credit Agreement is hereby amended in its entirety to read as follows: (a) Initial Borrowing Base. For the period from and including ---------------------- the Third Amendment Effective Date to but excluding the next Redetermination Date, the amount of the Borrowing Base shall be $325,000,000. Notwithstanding the foregoing, the Borrowing Base shall be subject to adjustments from time to time pursuant to this Section 2.07 and Section 8.13(c), Section 9.12(a) and Section 9.13(e). SECTION 2. Defined Terms. Except as amended hereby, terms used ------------- herein when defined in the Credit Agreement shall have the same meanings herein unless the context otherwise requires. SECTION 3. Conditions Precedent to Effectiveness. This Third Amendment ------------------------------------- shall become effective as of the date hereof when the Administrative Agent shall have received counterparts hereof duly executed by the Borrower and all of the Lenders (or, in the case of any party as to which an executed counterpart shall not have been received, telegraphic, telex, or other written confirmation from such party of execution of a counterpart hereof by such party). SECTION 4. Reaffirmation of Representations and Warranties. To induce ----------------------------------------------- the Lenders, the Administrative Agent and the Issuing Bank to enter into this Third Amendment, the Borrower hereby reaffirms, as of the date hereof, its representations and warranties in their entirety contained in Article VII of the Credit Agreement and in all other documents executed pursuant thereto (except to the extent such representations and warranties relate solely to an earlier date). SECTION 5. Reaffirmation of Credit Agreement. This Third Amendment --------------------------------- shall be deemed to be an amendment to the Credit Agreement, and the Credit Agreement, as amended hereby, is hereby ratified, approved and confirmed in each and every respect. All references to the Credit Agreement herein and in any other document, instrument, agreement or writing shall hereafter be deemed to refer to the Credit Agreement, as amended hereby. SECTION 6. Governing Law; Entire Agreement. This Third Amendment shall ------------------------------- be governed by, and construed in accordance with, the laws of the State of Texas. The Credit Agreement, as amended by this Third Amendment, the Notes and the other Loan Documents constitute the entire understanding among the parties hereto with respect to the subject matter hereof and supersede any prior agreements, written or oral, with respect thereto. 2 SECTION 7. Severability of Provisions. Any provision in this Third -------------------------- Amendment that is held to be inoperative, unenforceable, or invalid in any jurisdiction shall, as to that jurisdiction, be inoperative, unenforceable, or invalid without affecting the remaining provisions in that jurisdiction or the operation, enforceability, or validity of that provision in any other jurisdiction, and to this end the provisions of this Third Amendment are declared to be severable. SECTION 8. Counterparts. This Third Amendment may be executed in any ------------ number of counterparts, all of which taken together shall constitute one agreement, and any of the parties hereto may execute this Third Amendment by signing any such counterpart. SECTION 9. Headings. Article and section headings in this Third -------- Amendment are for convenience of reference only, and shall not govern the interpretation of any of the provisions of this Third Amendment. SECTION 10. Successors and Assigns. This Third Amendment shall be ---------------------- binding upon and inure to the benefit of the parties hereto and their respective successors and assigns. 3 IN WITNESS WHEREOF, the parties hereto have executed this Third Amendment as of the date first above written. BORROWER ST. MARY LAND & EXPLORATION COMPANY By: /S/ DAVID W. HONEYFIELD -------------------------------------- Name: David W. Honeyfield Title: V.P - Finance, Secretary and Treasurer AGENTS AND LENDERS: WACHOVIA BANK, NATIONAL ASSOCIATION, Individually, as Issuing Bank and as Administrative Agent By: /S/ PHILIP J. TRINDER -------------------------------------- Name: Philip J. Trinder Title: Vice President BANK ONE, NA, Individually and as Co-Syndication Agent By: /s/ ELIZABETH PAVLAS -------------------------------------- Name: Elizabeth Pavlas Title: Associate WELLS FARGO BANK, N.A., Individually and as Co-Syndication Agent By: /S/ LAURA BUMGARNER -------------------------------------- Name: Laura Bumgarner Title: Relationship Manager, AVP ROYAL BANK OF CANADA, Individually and as Co-Documentation Agent By: /S/ DAVID A. MCCLUSKEY -------------------------------------- Name: David A. McCluskey Title: Authorized Signatory COMERICA BANK-TEXAS, Individually and as Co-Documentation Agent By: /S/ PETER L. SEFZIK -------------------------------------- Name: Peter L. Sefzik Title: Vice President BNP PARIBAS By: /S/ BETSY JOCHER -------------------------------------- Name: Betsy Jocher Title: Vice President By: /S/ POLLY SCHOTT -------------------------------------- Name: Polly Schott Title: Vice President BANK OF SCOTLAND By: /S/ AMENA NABI -------------------------------------- Name: Amena Nabi Title: Assistant Vice President U.S. BANK NATIONAL ASSOCIATION By: /S/ MARK E. THOMPSON -------------------------------------- Name: Mark E. Thompson Title: Vice President HIBERNIA NATIONAL BANK By: /S/ DARIA MAHONEY -------------------------------------- Name: Daria Mahoney Title: Vice President