1992-10-15_REVISION - M1988112 - Laserfiche WebLink

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~ iii iiiiiiiiiiiiiiu BATTLE MOUNTAIN GOLD COMPANY October 12, 1992 Mr. Larry Oehler Division of Mining and Geology Department of Natural Resources 1313 Sherman Street, Room 215 Denver, Colorado 80203 UL' 1 1 S 199 JIB-~J~,J •. iiLEOMOUNfAIN GOLD COMPANY Re: Battle Mountain Resources, Inc. - San Luis Project DMG Permit No. M-88-112 Technical Revision No. 007, Hydrogen Peroxide Addition Request for Extension of the Use of Hydrogen Peroxide Dear Mr. Oehler: This letter serves as a request to continue to have the option of adding hydrogen peroxide to the tailings pond to maintain the cyanide concentrations at Battle Mountain Resources, Inc.'s San Luis Project until the start-up phase of the newly installed INCO circuit is completed. Hydrogen peroxide is currently being added to the active pond in accordance with the approved TR-007. TR-007 was conditionally approved with the stipulation that "hydrogen peroxide as a treatment for lowering the weak acid dissociable cyanide and copper concentrations is a temporary solution, to be applied only until the INCO SO /Air process is approved and installed. The HzOz system shall not she used after October 15, 1992, without the express written permission from the Division." We currently anticipate that the INCO system will be brought on- line during the week of October 12. With the start-up of a new circuit, a certain amount of equipment adjusting, flow rate adjusting of the SOZ and the air, operator training, and system tuning is expected. The circuit will operate with greatest efficiency after the start-up and training phase is completed. During the start-up phase of the INCO circuit, we request to have the option of adding hydrogen peroxide to the tailings pond to reduce the cyanide concentrations on an as needed basis. Hydrogen peroxide will only be used as a back-up detoxification method during the tuning of the INCO circuit. The start-up phase is expected to last about four weeks. We will inform you on the progress of the INCO start-up. P.O. BOX 310 SAN LUIS, COLORADO S 1152 (719) 672-3362 FAX (719) 672-3363