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iii iiiiiiiiniii iii . ; <br /> ,~ .. <br />BATTLE MOUNTAIN GOLD COMPANY .r :~~ <br />February 10, 1993 <br />YE~1~ <br />Mr. Larry Oehler '~ - ~~ <br />Division of Minerals and Geology t~~;d~"~ <br />- .J, <br />1313 Sherman Street, Room 215 c~oloco°OMenTPJrrv <br />Denver, Colorado 80203 <br />Re: Battle Mountain Resources, Inc. - San Luis Project <br />DMG Permit No. M-88-112, TR-010 <br />INCO Monthly Summary - January 1993 <br />Dear Mr. Oehler: <br />Attached is the January 1993 monthly summary of cyanide <br />analysis performed on tailings exiting the IN(:O c>_rau>_t. This <br />letter also serves as a follow-up to our telephone <br />conversation of February 5, 1993, concerning the results <br />reported by Core Laboratories on the December 10, 1992 post- <br />detox sample. <br />As specified in TR-010, samples are collected five to nine <br />days apart; a minimum of one sample per week is sent to Core <br />Laboratories for outside lab verification. The cyanide levels <br />in the tailings exiting the INCO circuit are monitored on a <br />30-day rolling average calculated weekly. <br />Core Laboratories reported cyanide values of 12.6 ppm CN-wad <br />and 22.7 ppm CN-total for the December 10, 1992 post-detox <br />sample. The Core Labs report was received at the San Luis <br />Project on February 4, 1993. <br />This sample was part of a bi-weekly sampling event. As <br />specified in TR-006, cyanide values are calculated or the <br />process point samples collected during a bi-weekly ampling <br />event. The calculations are based on methods outli ed in the <br />May 1992 cyanide chemistry report by Dr. Adrian Smi h. The <br />calculated cyanide value range for this sample is 1.53-2.21 <br />ppm CN-wad and 1.61-2.29 ppm CN-total. The values reported by <br />Core Lab are suspect. Core Labs verified the raw dalta. The <br />sample cannot be re-analyzed due to an insufficient volume of <br />sample remaining. A post-detox sample also collect~d on <br />December 10 and analyzed on-site showed 2.19 ppm CN~wad and <br />3.97 ppm CN-total. <br />As specified in TR-010, a 30-day rolling average of the <br />cyanide concentrations exiting the INCO circuit is calculated <br />weekly. Due to the suspect nature of the December 0 post- <br />detox sample analyzed by Core Labs, the maximum calculated <br />cyanide values were used in the 30-day rolling avergges. The <br />30-day rolling average calculations are enclosed. <br />P.O. BOX 310 SAN LUIS, COLORADO 81152-03f0 (719) 672-3362 FAX (719) 672-3363 <br />