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~ III IIIIIIIIIIIIIIII <br />• <br />BATTLE MOUNTAIN RESOURCES, INC. <br />April 21, 1994 <br />Mr. Larry Oehler <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />~ '. ~.,; <br />RE~.• <br />` J ,, ~~~ <br />,. ,;;i~:.L ~::c;^.csv c~dTiocr~rAaNw~ <br />~r~ • 1 <br />Re: Battle Mountain Resources, Inc <br />DMG Permit No. M-88-112 Liquid <br />Dear Mr. Oehler: <br />(BMRI) - San Luis Project <br />Oxygen Plant Test <br />During the past several months, the operating efficiency and <br />effectiveness of the leaching circuit has been evaluated. <br />Several operating ideas have been laboratory/bench-scale tested <br />for improving the air injection system within the lead tanks. <br />The presence of oxygen enhances the leaching process. Based on <br />the positive results of the testwork, the San Luis Project will <br />be conducting a plant test to evaluate the use of liquid oxygen <br />in the leaching circuit. Initially, liquid oxygen will be <br />injected into tank one, but other injection locations in the <br />circuit may be tested. The trial period is expected tc Legin mid <br />May and last one month, but may be extended depending on the <br />early results. Testwork has indicated a potential reduction in <br />cyanide consumption of 33% and an increase in gold recovery of <br />about 2.50. <br />Air Liquide America will be supplying the portable 6000 to 9000 <br />gallon oxygen supply system. No additional structures at the site <br />will be necessary as the system is portable and temporary. This <br />system will include suitable vaporizers, gas regulation <br />equipment, and safety devices. The safety devices include an <br />adequately sized oxygen flow control and metering system, <br />incl~~ding a fail-safe valve that will shut off the flow of oxygen <br />in the event of an electrical power outage. Air Liquide America <br />will provide an Applications Engineer to assist during the trial <br />period. Oxygen safety training and applicable literature will be <br />provided for all personnel involved prior to the start ~f the <br />trial. <br />A SUBCfD1AR t' OF BATRC M1fOUKLAlN COLD COMPANY <br />P.O. BOX 710 SAN LUIS, COLORADO fll 157-0310 (719167? 336? FAA (719) 67?-3367 <br />