- --------------------------------------------------------------------------- KAISER ALUMINUM & CHEMICAL CORPORATION, as Issuer, KAISER ALUMINA AUSTRALIA CORPORATION, ALPART JAMAICA INC., KAISER JAMAICA CORPORATION, KAISER FINANCE CORPORATION, KAISER MICROMILL HOLDINGS, LLC, KAISER SIERRA MICROMILLS, LLC, KAISER TEXAS SIERRA MICROMILLS, LLC, KAISER TEXAS MICROMILL HOLDINGS, LLC, KAISER BELLWOOD CORPORATION, and KAISER TRANSACTION CORP., as Subsidiary Guarantors and U.S. BANK TRUST NATIONAL ASSOCIATION, as Trustee SECOND SUPPLEMENTAL INDENTURE Dated as of March 31, 1999 to INDENTURE Dated as of December 23, 1996 10-7/8% Series D Senior Notes due 2006 - --------------------------------------------------------------------------- SECOND SUPPLEMENTAL INDENTURE, dated as of March 31, 1999, among KAISER ALUMINUM & CHEMICAL CORPORATION, a Delaware corporation (the "Company"), as Issuer, KAISER ALUMINA AUSTRALIA CORPORATION, a Delaware corporation ("KAAC"), ALPART JAMAICA INC., a Delaware corporation ("AJI"), KAISER JAMAICA CORPORATION, a Delaware corporation ("KJC"), KAISER FINANCE CORPORATION, a Delaware corporation ("Kaiser Finance"), KAISER MICROMILL HOLDINGS, LLC, a Delaware limited liability company ("KMH"), KAISER SIERRA MICROMILLS, LLC, a Delaware limited liability company ("KSM"), KAISER TEXAS SIERRA MICROMILLS, LLC, a Texas limited liability company ("Texas Sierra"), KAISER TEXAS MICROMILL HOLDINGS, LLC, a Texas limited liability company ("Texas Holdings"), KAISER BELLWOOD CORPORATION, a Delaware corporation ("Kaiser Bellwood"), and KAISER TRANSACTION CORP., a Delaware corporation ("Kaiser Transaction"), as Subsidiary Guarantors, and U.S. Bank Trust National Association (formerly known as First Trust National Association), a national banking association, as Trustee (the "Trustee"). WHEREAS, the Company, KAAC, AJI, KJC, Kaiser Finance, KMH, KSM, Texas Sierra, Texas Holdings, and the Trustee executed an Indenture, dated as of December 23, 1996 (the "Original Indenture"), in respect of $50,000,000 aggregate principal amount of the Company's 10-7/8% Series D Senior Notes due 2006 (the "Securities"), and the Original Indenture was amended by a First Supplemental Indenture, dated as of July 15, 1997 (the Original Indenture, as amended by such First Supplemental Indenture hereinafter referred to as the "Indenture"); and WHEREAS, Section 4.12 of the Indenture requires, under circumstances specified in Section 4.12, that the Company shall cause certain Subsidiaries of the Company to execute and deliver to the Trustee a supplemental indenture in form and substance satisfactory to the Trustee pursuant to which such Subsidiaries of the Company shall be named as additional Subsidiary Guarantors; and WHEREAS, all conditions and requirements necessary to make this Second Supplemental Indenture a valid, binding and legal instrument in accordance with its terms have been performed and fulfilled and the execution and delivery hereof have been in all respects duly authorized; NOW, THEREFORE, in consideration of the above premises, each party agrees, for the benefit of the other and for the equal and ratable benefit of the Holders of the Securities, as follows: ARTICLE I AMENDMENTS Section 1. The Company, KAAC, AJI, KJC, Kaiser Finance, KMH, KSM, Texas Sierra, Texas Holdings, Kaiser Bellwood, Kaiser Transaction, and the Trustee hereby amend the Indenture and agree that Kaiser Transaction shall be a Subsidiary Guarantor for all purposes under the Indenture and the term "Subsidiary Guarantor" shall for all purposes under the Indenture specifically include Kaiser Transaction. ARTICLE II MISCELLANEOUS PROVISIONS Section 2.1. Terms Defined. For all purposes of this Second Supplemental Indenture, except as otherwise defined or unless the context otherwise requires, terms used in capitalized form in this Second Supplemental Indenture and defined in the Indenture have the meanings specified in the Indenture. Section 2.2. Indenture. Except as amended hereby, the Indenture and the Securities are in all respects ratified and confirmed and all their terms shall remain in full force and effect. Section 2.3. Governing Law. This Second Supplemental Indenture shall be deemed to be a contract made under the laws of the State of New York, and for all purposes shall be governed by and construed in accordance with the laws of said state without regard to the principles of the conflict of laws provisions thereof. Section 2.4. Successors and Assigns. All agreements of the Company, KAAC, AJI, KJC, Kaiser Finance, KMH, KSM, Texas Sierra, Texas Holdings, Kaiser Bellwood, and Kaiser Transaction in this Second Supplemental Indenture and the Securities shall bind its successors and assigns. Section 2.5. Multiple Counterparts. This Second Supplemental Indenture may be executed in any number of counterparts, each of which shall be an original; but such counterparts shall together constitute but one and the same instrument. Section 2.6. Effectiveness. The provisions of this Second Supplemental Indenture shall become effective immediately upon its execution and delivery by the Trustee in accordance with the provisions of Article Ten of the Indenture. Section 2.7. Trustee Disclaimer. The Trustee accepts the amendment of the Indenture effected by this Second Supplemental Indenture and agrees to execute the trust created by the Indenture as hereby amended, but only upon the terms and conditions set forth in the Indenture, including the terms and provisions defining and limiting the liabilities and responsibilities of the Trustee, which terms and provisions shall in like manner define and limit its liabilities and responsibilities in the performance of the trust created by the Indenture as hereby amended, and, without limiting the generality of the foregoing, the Trustee shall not be responsible in any manner whatsoever for or with respect to any of the recitals or statements contained herein, all of which recitals or statements are made solely by the Company, KAAC, AJI, KJC, Kaiser Finance, KMH, KSM, Texas Sierra, Texas Holdings, Kaiser Bellwood, and Kaiser Transaction, or for or with respect to (i) the validity, efficacy or sufficiency of this Second Supplemental Indenture or any of the terms or provisions hereof, (ii) the proper authorization hereof by the Company, KAAC, AJI, KJC, Kaiser Finance, KMH, KSM, Texas Sierra, Texas Holdings, Kaiser Bellwood, and Kaiser Transaction by corporate action or limited liability company action or otherwise, (iii) the due execution hereof by the Company, KAAC, AJI, KJC, Kaiser Finance, KMH, KSM, Texas Sierra, Texas Holdings, Kaiser Bellwood, and Kaiser Transaction, or (iv) the consequences (direct or indirect and whether deliberate or inadvertent) of any amendment herein provided for, and the Trustee makes no representation with respect to any such matters. SIGNATURES IN WITNESS WHEREOF, the parties hereto have caused this Second Supplemental Indenture to be duly executed, all as of the date first written above. KAISER ALUMINUM & CHEMICAL CORPORATION, as Issuer By: /s/ Karen A. Twitchell ----------------------------------- Name: Karen A. Twitchell Title: Treasurer Dated: March 31, 1999 Attest: /s/ John Wm. Niemand II ----------------------------- Name: John Wm. Niemand II Title: Secretary KAISER ALUMINA AUSTRALIA CORPORATION, as a Subsidiary Guarantor By: /s/ Karen A. Twitchell ----------------------------------- Name: Karen A. Twitchell Title: Treasurer Dated: March 31, 1999 Attest: /s/ John Wm. Niemand II ----------------------------- Name: John Wm. Niemand II Title: Secretary ALPART JAMAICA INC., as a Subsidiary Guarantor By: /s/ Karen A. Twitchell ----------------------------------- Name: Karen A. Twitchell Title: Treasurer Dated: March 31, 1999 Attest: /s/ John Wm. Niemand II ----------------------------- Name: John Wm. Niemand II Title: Secretary KAISER JAMAICA CORPORATION, as a Subsidiary Guarantor By: /s/ Karen A. Twitchell ----------------------------------- Name: Karen A. Twitchell Title: Treasurer Dated: March 31, 1999 Attest: /s/ John Wm. Niemand II ----------------------------- Name: John Wm. Niemand II Title: Secretary KAISER FINANCE CORPORATION, as a Subsidiary Guarantor By: /s/ Karen A. Twitchell ----------------------------------- Name: Karen A. Twitchell Title: Treasurer Dated: March 31, 1999 Attest: /s/ John Wm. Neimand II ----------------------------- Name: John Wm. Niemand II Title: Secretary KAISER MICROMILL HOLDINGS, LLC, as a Subsidiary Guarantor By: /s/ Karen A. Twitchell ----------------------------------- Name: Karen A. Twitchell Title: Treasurer Dated: March 31, 1999 Attest: /s/ John Wm. Niemand II ----------------------------- Name: John Wm. Niemand II Title: Secretary KAISER SIERRA MICROMILLS, LLC, as a Subsidiary Guarantor By: /s/ Karen A. Twitchell ----------------------------------- Name: Karen A. Twitchell Title: Treasurer Dated: March 31, 1999 Attest: /s/ John Wm. Niemand II ----------------------------- Name: John Wm. Niemand II Title: Secretary KAISER TEXAS SIERRA MICROMILLS, LLC, as a Subsidiary Guarantor By: /s/ Karen A. Twitchell ----------------------------------- Name: Karen A. Twitchell Title: Treasurer Dated: March 31, 1999 Attest: /s/ John Wm. Niemand II ----------------------------- Name: John Wm. Niemand II Title: Secretary KAISER TEXAS MICROMILL HOLDINGS, LLC, as a Subsidiary Guarantor By: /s/ Karen A. Twitchell ----------------------------------- Name: Karen A. Twitchell Title: Treasurer Dated: March 31, 1999 Attest: /s/ John Wm. Niemand II ----------------------------- Name: John Wm. Niemand II Title: Secretary KAISER BELLWOOD CORPORATION, as a Subsidiary Guarantor By: /s/ Karen A. Twitchell ----------------------------------- Name: Karen A. Twitchell Title: Treasurer Dated: March 31, 1999 Attest: /s/ John Wm. Niemand II ----------------------------- Name: John Wm. Niemand II Title: Secretary KAISER TRANSACTION CORP., as a Subsidiary Guarantor By: /s/ Karen A. Twitchell ----------------------------------- Name: Karen A. Twitchell Title: Treasurer Dated: March 31, 1999 Attest: /s/ John Wm. Niemand II ----------------------------- Name: John Wm. Niemand II Title: Secretary U.S. BANK TRUST NATIONAL ASSOCIATION, as Trustee By: ----------------------------------- Name: ----------------------------------- Title: ----------------------------------- Dated: March 31, 1999 Attest: ------------------------------ Name: ------------------------- Title: -------------------------