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<br /> <br />BATTLE MOUNTAIN GOLD COMPANY <br />~~M, a9sa <br />~-.- ,. , <br />'JN 15 1992 <br />ANDRE J. DOUCHANE fl4111E MOUNWN <br />NORTHRA MIH RICAN OPERATIONS '~~~~1 EG Ld~l(~ GOlU COMPANY <br />June 11, 1992 q@~)arv.^+~~r ~. ~-~~'~ <br />Dr, James A. Pendleton <br />Colorado Mined Land Reclamation Division <br />1313 Sherman St. <br />215 Centennial Building <br />Denver, Cn gn?n3 <br />Dear Dr. Pendleton: <br />In response to comments on Technical Revision #007 from David <br />E. Hyatt, as outlined in his letter to Dr. James A. Pendleton <br />on June 9, 1992, comments are discussed in the order presented <br />in the letter. <br />Comment #1 <br />Documents submitted to MLRD reflecting tests performed by <br />Degussa on samples from the San Luis facility clearly <br />demonstrated that very low levels of total cyanide can be <br />achieved with the proposed hydrogen peroxide process. <br />Comment #2 <br />Use of CYTOX in combination with peroxide will produce cyanide <br />complexes of iron, zinc and copper, which are insoluble in the <br />present and future environment of the tailings facility. It is <br />anticipated that the use of this combination of reagents will <br />provide better results than either used alone. <br />Comment #3 <br />BMG has been advised by both Degussa and FMC based on prior <br />similar successful applications, that maintaining the pond in <br />an active status will improve distribution of the required <br />reagents, and this enhances the efficiency of the cyanide <br />removal process. <br />Comment #4 <br />The peroxide distribution system has been specified by Degussa <br />based on substantial prior experience in pond applications. As <br />previously stated, an active pond provides a substantially <br />better mixing environment. <br />5670 GREEN WOOD PLAZA HLV D. SUITE 106 ENGLEWOOD, CO 80111 1303) 721-6744 FAX OU3) 721-6813 <br />