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<br />• iii iiiiiiiiiiiu iii ,~ <br />BATTLE MOUNTAIN GOLD COMPANY '' ~ <br />ANDRE J. DOUCNANE <br />Yll'E PRESIDENT. <br />NORTH AMERICAN OPERATIONS <br />May 26, 1992 <br />Dr. James A. Pendleton <br />Technical and Scientific Coordinator <br />Colorado Mined Land Reclamation Division <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 89203 <br />BPiRE MOIMWN <br />GOLD COMPANY <br />~^t <br />MAY 2 61992 <br />Mined land <br />:~eclafnatiAn Di"i5ion <br />RE: San Luis Project -Permit No. M-88-112 <br />Technical Revision No. 007, Tailings Cyanide Detoxification using Hydrogen <br />Peroxide <br />Dear Dr. Pendleton: <br />This technical revision is submitted in compliance with Abatement Requirement No. 4, <br />Tailings Cyanide Detoxification, as approved by the Mined Land Reclamation Board on <br />April 23, 1992 for the San Luis Facility. Battle Mountain Respurces (BMR) <br />contemplates a three-step approach for meeting the requirements of Abatement <br />Requirement No. 4. The steps are as follows: <br />1) Installation and operation of the CYTOX destruction system; <br />2) Installation and operation of a hydrogen peroxide destruction system; and <br />3) Installation and operation of an INCO SOZ/air destruction system. <br />On April 3, 1992, BMR submitted a Technical Revision (TR-005) for incorporation of <br />a CYTOX system for reduction of free cyanide levels in the tailings impoundment. On <br />April 7, 1992, Mined Land Reclamation Division (NERD) approved T1t-005 and the <br />process commenced operation on April 8, 1992. BMR believes that the CYTOX <br />destruction is functioning as intended and is effectively reducing the free cyanide <br />concentrations in the tailings slurry. As you know, the CYTOX destruction system was <br />not intended to be a method for reduction of other cyanide constituents in the <br />impoundment. Consequently, BMR proposes to install a hydrogen peroxide destruction <br />system in the tailings impoundment to reduce weak acid dissociable (WAD) cyanide <br />concentrations. <br />5670 GREEN WOOD PLAZA RL~D. SUITE 106 ENGLEWOOD, CO 80111 (10J) 721-6744 FAX (307) 721 b613 <br />