DATED AS OF APRIL 20,1999 BENZ ENERGY LTD. AND MONTREAL TRUST COMPANY OF CANADA TRUSTEE FIRST SUPPLEMENTAL NOTE INDENTURE THIS FIRST SUPPLEMENTAL NOTE INDENTURE made as of the 20th day of April, 1999 BETWEEN: BENZ ENERGY LTD., a corporation continued under the laws of the Yukon Territories having its registered office in the City of Whitehorse in the Yukon Territories (hereinafter called the "Corporation") OF THE FIRST PART -and- MONTREAL TRUST COMPANY OF CANADA, a trust company incorporated under the laws of Canada and having an office in the City of Calgary in the Province of Alberta (hereinafter called the "Trustee") OF THE SECOND PART WHEREAS the Corporation and the Trustee entered into a Note Indenture dated as of April 8,1998 (the "Note Indenture"); and WHEREAS the Corporation created and issued Notes as provided under the terms of the Note Indenture; and WHEREAS the Corporation desires to become domesticated in the State of Delaware and in connection therewith has requested that the Note Indenture be amended in anticipation of such migration; and WHEREAS the Corporation and the Trustee now desire to amend the Note Indenture in certain respects to reflect amendments that have been approved by one or more Extraordinary Resolutions passed by Noteholders in accordance with the terms of Article 9 of the Note Indenture, those amendments are more fully set forth below; and WHEREAS the Corporation and the Trustee now desire to amend the Terms and Conditions of Special Notes, Series A issued in accordance with the terms of the Note Indenture in certain respects to reflect amendments that have been approved by the Series A Noteholders pursuant to an Extraordinary Resolution passed in accordance with the terms of Article 9 of the Trust Indenture, those amendments are more fully set forth below. NOW, THEREFORE, in consideration of the premises and the mutual covenants contained in this FIRST SUPPLEMENTAL NOTE INDENTURE and intending to be legally bound, the undersigned agree as follows: - 2 - 1. AMENDMENT TO NOTE INDENTURE. The Note Indenture shall remain in full force and effect subject to the following amendments: 1.1 The definition of Affiliate in Article 1.1 of the Note Indenture is hereby amended by deleting the phrase "BUSINESS CORPORATIONS ACT (Yukon)" and inserting therefor the following: "General Corporation Law of the State of Delaware". 1.2 Article 1.1 of the Note Indenture is hereby amended by deleting the definition of "Counsel" and inserting therefor the following: "COUNSEL" means a barrister or solicitor or attorney or firm of barristers and solicitors or firm of attorneys retained by the Trustee or retained by the Corporation and acceptable to the Trustee; 1.3 Article 1.1 of the Note Indenture is hereby amended by deleting the definition of "Long Term Debt" and inserting therefor the following: "LONG TERM DEBT" means (i) amounts classified as long term debt as specified in the Corporation's and its Subsidiaries' audited financial statements or their audited consolidated financial statements, as the case may be, and shall include any amounts outstanding under the Bank One Credit Facility and the EnCap Credit Facility plus (ii) the nominal amount of any preferred stock issued by the Corporation and its Subsidiaries; 1.4 Article 1.1 of the Note Indenture is hereby amended by deleting the definition of "Taxes" and inserting therefor the following: "TAXES" means all taxes of any kind or nature whatsoever including, without limitation, all federal, provincial, municipal and local taxes, income taxes, capital taxes, levies, imposts, stamp taxes, royalties, duties, charges to tax, value added taxes, commodity taxes, goods and services taxes, excise taxes, business taxes, property taxes and withholding taxes charged, levied, collected, withheld or assessed by any relevant authority within any jurisdiction in Canada or in the United States having power to tax together with any penalties, fines, additions to tax and interest thereon and any instalments in respect thereof and, for greater certainty, does not include taxes charged, levied, collected, withheld or assessed by an authority outside Canada or the United States; 1.5 Article 5.9 of the Note Indenture is hereby deleted and the following is inserted therefor: 5.9 LONG TERM DEBT AND TANGIBLE ASSETS For the Corporation's fiscal years ending December 31,1998 and 1999, the Corporation will, so long as any Note is outstanding, maintain Tangible Assets equal to or greater than 100% of Long Term - 3 - Debt at all times including after redemption of any redeemable preference shares of the Corporation or any Subsidiary. For each of the Corporation's fiscal years ending after December 31,1999, the Corporation will, so long as any Note is outstanding, maintain Tangible Assets equal to or greater than 140% of Long Term Debt at all times including after redemption of any redeemable preference shares of the Corporation or any Subsidiary. This ratio shall be calculated no later than the 135th day following the end of each of the Corporation's fiscal years, and shall be based upon the Corporation's annual audited financial statements (as adjusted for Tangible Assets) and the Independent Reserve Reports. For purposes of this Article, the definition of (i) "Long Term Debt" shall not include obligations related solely to the sale, purchase or delivery of hydrocarbons in respect of production payments (whether volumetric or dollar denominated) or net profits interests conveyed in transfers to third parties; and (ii) "Tangible Assets" shall not include the value of any hydrocarbons which have been conveyed as part of such production payment or net profits interest. 1.6 Article 5.10(a) of the Note Indenture is hereby deleted. 1.7 Article 5.16 of the Note Indenture is hereby deleted and the following is inserted therefor: 5.16 WITHHOLDING AND REPORTING REQUIREMENTS To the extent permitted by law, the Corporation will provide to the Trustee, the Paying Agent or to any Noteholder such statements, certificates or other documentation concerning the organization or operations of the Corporation as may be reasonably necessary to establish any exceptions or exemptions from income tax withholding and reporting requirements of any taxing authority within Canada or the United States. 1.8 Article 5.17 of the Note Indenture is hereby deleted and the following is inserted therefor: 5.17 MAINTENANCE OF LISTING FOR COMMON SHARES AND NOTES While any Note remains outstanding, the Corporation will maintain a listing for its common shares on a nationally recognized stock exchange in Canada or the United States. For purposes of this Note Indenture, a nationally recognized United States stock exchange shall include the bulletin board maintained by Nasdaq. 1.9 Article 7.3 of the Note Indenture is hereby amended by deleting the phrase "of Canada" and inserting therefor the following: "of the United States". 1.10 The first grammatical paragraph of Article 8.1 of the Note Indenture is hereby deleted and the following in inserted therefor: - 4 - The Corporation shall not enter into any transaction, whether by way of amalgamation, merger, reconstruction, re-organization, consolidation, transfer, sale, lease or otherwise, whereby all or substantially all of its undertaking, property and assets would become the property of any other Person or, in the case of any such amalgamation, of the continuing corporation resulting therefrom, but may do so if: 1.11 Article 8.1 of the Note Indenture is hereby amended by deleting paragraph (a) and inserting therefor the following: (a) such other Person or continuing corporation is a corporation (the "Successor Corporation") incorporated under the laws of Canada or any province thereof or any state of the United States; 1.12 Article 9.1 of the Note Indenture is hereby amended by deleting the phrase "Calgary" and inserting therefor the following: "Houston, Texas". 1.13 Article 10.4 of the Note Indenture is hereby amended by deleting the first grammatical paragraph and inserting therefor the following: If the Trustee determines that mail service is or is threatened to be interrupted at the time when the Trustee is required or elects to give any notice to the Holder of Registered Notes hereunder, the Trustee shall, notwithstanding the provisions hereof, give such notice by means of publication in (i) The Globe and Mail, national edition, or any other English language daily newspaper or newspapers of general circulation in Canada; and (ii) in the Houston Chronicle or any successor newspaper, in all cases once in each of two successive weeks, and any notice so published shall be deemed to have been given on the latest date on which the first publication takes place. 1.14 Article 11.8 of the Note Indenture is hereby amended by deleting the phrase "chartered bank of Canada" and inserting therefor the following: "Bank chartered in the United States and subject to regulation by the Federal Deposit Insurance Corporation". 1.15 The Note Indenture is hereby amended by adding the following provision: "9.19 AMENDMENTS TO TRUST INDENTURE If this Indenture or the Notes are changed, modified or amended as permitted in the Indenture, Noteholders shall be deemed to have approved and consented to, and shall be bound by, any - 5 - corresponding changes, modifications or amendments made to the Trust Indenture and the Convertible Debentures to which the Notes are exchangeable into provided such corresponding changes, modifications or amendments are substantially equivalent to the changes made to this Indenture and the Notes, with the same effect as if the Noteholders had exchanged their Notes for Convertible Debentures and approved such changes, modifications or amendments in their capacity as Debentureholders under the Trust Indenture." 2. CONDITIONAL AMENDMENT TO THE NOTE INDENTURE. The amendments to the Note Indenture set forth in Article 1 above are conditioned upon the receipt by the Corporation and Trustee of appropriate evidence of approval from the Holders of any other Series of Notes that is required to approve amendments to the Trust Indenture. The execution of this Supplement by the Corporation and the Trustee shall be evidence of the satisfaction of this requirement. 3. COUNTERPARTS AND FORMAL DATE. This Supplemental Indenture may be executed in several counterparts, each of which when so executed shall be deemed to be an original, and such counterparts together shall constitute one and the same instrument and notwithstanding their date of execution shall be deemed to bear date as of the 20th day of April, 1999. The execution of this First Supplemental Note Indenture has been authorized pursuant to the terms of an Extraordinary Resolution approved by the Holders of the Special Notes, Series A. 4. GOVERNING LAW. This Supplemental Indenture shall be governed by and construed in accordance with the laws of the Province of Ontario and the laws of Canada applicable therein and shall be treated in all respects as Ontario contracts. 5. LANGUAGE OF SUPPLEMENTAL INDENTURE. The parties hereto have requested that this document be drafted in the English language. Les parties ont demande que le present document soit redige' en langue anglaise. - 6 - IN WITNESS WHEREOF the parties hereto have executed this First Supplemental Indenture under their respective corporate seals and the hands of their proper officers duly authorized in that behalf on the date first hereinabove written. BENZ ENERGY LTD. By: /s/ Robert S. Herlin ------------------------------------- Robert S. Herlin, SVP c/s ------------------------------------- MONTREAL TRUST COMPANY OF CANADA By: ------------------------------------- c/s By: ------------------------------------- c/s EXHIBIT B AMENDMENTS TO THE TERMS AND CONDITIONS OF THE 9% CONVERTIBLE DEBENTURES, SERIES 2 The Terms and Conditions of 9% Convertible Debentures, Series 2 (the "Series 2 Convertible Debentures") are hereby amended as follows. 1. Article 9(a) of Schedule B to the Trust Indenture (which Article is on page B-3 of the Trust Indenture) is hereby amended by deleting the price "Cdn.$1.70" and inserting therefor the price "Cdn.$1.40". 2. Article 10 of Schedule B to the Trust Indenture (which Article is on page B-3 of the Trust Indenture) is hereby amended by deleting the phrase "in Canada on which the Common Shares are traded" and inserting therefor the following: "on which the Common Shares are traded or if not available, then the price as quoted on a national or regional quotation service such as the NASDAQ National Market System or other similar quotation service maintained by the National Quotation Bureau or any successor thereto". 3. The Transfer Form of Schedule B to the Trust Indenture (which Transfer Form is on page B-7 of the Trust Indenture) is hereby amended by deleting the phrase "Special Notes, Series A" and inserting therefor the following: "Convertible Debentures, Series 2". 4. The Transfer Form of Schedule B to the Trust Indenture (which Transfer Form is on page B-7 of the Trust Indenture) is hereby amended by deleting the phrase "Signature of Special Noteholder" and inserting therefor the following: "Signature of Debentureholder". 5. The first grammatical paragraph of Article 9 of the Terms and Conditions of the Series 2 Convertible Debentures (which Article is on page B-11 of the Trust Indenture) is hereby amended by deleting the price "Cdn.$1.70" and inserting therefor the price "Cdn.$1.40". 6. The last grammatical paragraph of Article 9 of the Terms and Conditions of the Series 2 Convertible Debentures (which Article is on page B-12 of the Trust Indenture) is hereby amended by deleting the phrase "in Canada on which the Common Shares are traded" and inserting therefor the following: "on which the Common Shares are traded or if not available, then the price as quoted on a national or regional quotation service such as the NASDAQ National Market System or other similar quotation service maintained by the National Quotation Bureau or any successor thereto". 1 7. Article 10 of the Terms and Conditions of the Series 2 Convertible Debentures (which Article is on page B-12 of the Trust Indenture) is hereby amended by deleting the phrase "in Canada on which the Common Shares are traded" and inserting therefor the following: "on which the Common Shares are traded or if not available, then the price as quoted on a national or regional quotation service such as the NASDAQ National Market System or other similar quotation service maintained by the National Quotation Bureau or any successor thereto". 8. Article 16(a) of the Terms and Conditions of the Series 2 Convertible Debentures (which Article is on page B-15 of the Trust Indenture) is hereby deleted and the following is inserted therefor: For the Issuer's fiscal years ending December 31,1998 and 1999, the Issuer will, so tong as any Convertible Debenture is outstanding, maintain Tangible Assets equal to or greater than 100% of Long Term Debt at all times including after redemption of any redeemable preference shares of the Issuer or any Subsidiary. For each of the Issuer's fiscal years ending after December 31, 1999, the Issuer will, so long as any Convertible Debenture is outstanding, maintain Tangible Assets equal to or greater than 140% of Long Term Debt at all times including after redemption of any redeemable preference shares of the Issuer or any Subsidiary. This ratio shall be calculated no later than the 135th day following the end of each of the Issuer's fiscal years, and shall be based upon the Issuer's annual audited financial statements, as adjusted for Tangible Assets, and the Independent Reserve Reports. For purposes of this provision, the definition of (i) "Long Term Debt" shall not include obligations related solely to the sale, purchase or delivery of hydrocarbons in respect of production payments (whether volumetric or dollar denominated) or net profits interests conveyed in transfers to third parties; and (ii) "Tangible Assets" shall not include the value of any hydrocarbons which have been conveyed as part of such production payment or net profits interest. 9. Article 16(b)(i) of the Terms and Conditions of the Series 2 Convertible Debentures (which Article is on page B-15 of the Trust Indenture) is hereby deleted. The Amendments set forth in this Exhibit B to the Terms and Conditions of the 9% Convertible Debentures, Series 2 have been accepted and agreed to by Benz Energy Ltd. effective as of April 20,1999. BENZ ENERGY LTD. By: /s/ Robert S. Herlin ----------------------------------- Robert S. Herlin, SVP 2 EXHIBIT C Amendments to the Terms and Conditions of the 9% Convertible Debentures, Series 3 The Terms and Conditions of 9% Convertible Debentures, Series 3 (the "Series 3 Convertible Debentures") are hereby amended as follows: 1. Article 9(a) of Schedule C to the Trust Indenture (which Article is on page C-2 of the Trust Indenture) is hereby amended by deleting the price "Cdn.$1.70" and inserting therefor the price "Cdn.$1.40". 2. Article 10 of Schedule C to the Trust Indenture (which Article is on page C-3 of the Trust Indenture) is hereby amended by deleting the phrase "in Canada on which the Common Shares are traded" and inserting therefor the following: "on which the Common Shares are traded or if not available, then the price as quoted on a national or regional quotation service such as the NASDAQ National Market System or other similar quotation service maintained by the National Quotation Bureau or any successor thereto". 3. The Transfer Form of Schedule C to the Trust Indenture (which Transfer Form is on page C-7 of the Trust Indenture) is hereby amended by deleting the phrase "Special Notes, Series A" and inserting the following: "Convertible Debentures, Series 3" 4. The Transfer Form of Schedule C to the Trust Indenture (which Transfer Form is on page C-7 of the Trust Indenture) is hereby amended by deleting the phrase "TRANSFER OF SPECIAL WARRANTS". 5. The Transfer Form of Schedule C to the Trust Indenture (which Transfer Form is on page C-7 of the Trust Indenture) is hereby amended by deleting the phrase "Signature of Special Noteholder" and inserting therefor the following: "Signature of Debentureholder". 6. The first grammatical paragraph of Article 9 of the Terms and Conditions of the Series 3 Convertible Debentures (which Article is on page C-11 of the Trust Indenture) is hereby amended by deleting the price "Cdn.$1.70" and inserting therefor the price "Cdn.$1.40". 7. The last grammatical paragraph of Article 9 of the Terms and Conditions of the Series 3 Convertible Debentures (which Article is on page C-12 of the Trust Indenture) is hereby amended by deleting the phrase "in Canada on which the Common Shares are traded" and inserting therefor the following: "on which the Common Shares are traded or if not available, then the price as quoted on a national or regional quotation service such as the NASDAQ National Market System or other similar quotation service maintained by the National Quotation Bureau or any successor thereto". 8. Article 10 of the Terms and Conditions of the Series 3 Convertible Debentures (which Article is on page C-12 of the Trust Indenture) is hereby amended by deleting the phrase "in Canada on which the Common Shares are traded" and inserting therefor the following: 3 "on which the Common Shares are traded or if not available, then the price as quoted on a national or regional quotation service such as the NASDAQ National Market System or other similar quotation service maintained by the National Quotation Bureau or any successor thereto". 9. The second, third, and fifth grammatical paragraphs of Article 15 of the Terms and Conditions of the Series 3 Convertible Debentures (which Article is on page C-15 of the Trust Indenture) are hereby amended by deleting the references to "Canada" in each paragraph and inserting therefor the phrase "Canada or the United States". 10. Article 16(a) of the Terms and Conditions of the Series 3 Convertible Debentures (which Article in on page C-16 of the Trust Indenture) is hereby deleted and the following is inserted therefor: For the Issuer's fiscal years ending December 31, 1998 and 1999, the Issuer will, so long as any Convertible Debenture is outstanding, maintain Tangible Assets equal to or greater than 100% of Long Term Debt at all times including after redemption of any redeemable preference shares of the Issuer or any Subsidiary. For each of the Issuer's fiscal years ending after December 31, 1999, the Issuer will, so long as any Convertible Debenture is outstanding, maintain Tangible Assets equal to or greater than 140% of Long Term Debt at all times including after redemption of any redeemable preference shares of the Issuer or any Subsidiary. This ratio shall be calculated no later than the 135th day following the end of each of the Issuer's fiscal years, and shall be based upon the Issuer's annual audited financial statements, as adjusted for Tangible Assets, and the Independent Reserve Reports. For purposes of this provision, the definition of (i) "Long Term Debt" shall not include obligations related solely to the sale, purchase or delivery of hydrocarbons in respect of production payments (whether volumetric or dollar denominated) or net profits interests conveyed in transfers to third parties; and (ii) "Tangible Assets" shall not include the value of any hydrocarbons which have been conveyed as part of such production payment or net profits interest. 11. Article 16(b)(i) of the Terms and Conditions of the Series 3 Convertible Debentures (which Article is on page C-16 of the Trust Indenture) is hereby deleted. The Amendments set forth in this Exhibit C to the Terms and Conditions of the 9% Convertible Debentures, Series 3 have been accepted and agreed to by Benz Energy Ltd. effective as of April 20, 1999. BENZ ENERGY LTD. By: /s/ Robert S. Herlin ------------------------------------ Robert S. Herlin, SVP 4