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iii-i ii i i~ i ii iiii iii BATTLE MOUNTAIN RESOURCES, INC. A4R 11993 QIV ~J'Jil ti. ~Na,tl~ub. ~~ March 29, 1993 Mr. Larry Oehler Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver, Colorado 80203 Re: Battle Mountain Resources, Inc. DMG Permit No. M-88-112, TR-010 Weekly Pond Compliance Report - Dear Mr. Oehler: ne r~nouNwN D CdrPANY - San Luis Project March 21-27, 1993 Attached is a summary of the daily on-site cyanide analysis performed on samples from the active pond and the collection pond during the week of March 21-27, 1993 as required by the approved TR-010. This letter also serves as a follow~up discussion to the March 29 message that I reco~de onyouur VO1Ce mail. G,-!~• G~~cG~ ~/,~-~ v~~y f~...r strt !J a ~.c L%a c.--tJSu r!< - - w.•. y~-~I~lt~~~~ 6~~fi s~:.r ~r.:l ~~-(!~ f~ f4i~- I'a.;r~ ylK ,~~-.t a/.~.y During the week bf March 21-27, the active (low~r) pond I r~c.~~«f ~ averaged 2.94 ppm CN-wad and 5.06 ppm CN-total. The 1~',zar,! « . {~ collection pond averaged 1.08 ppm CN-wad and 1.55 ppm CN- f~,f ~~~1_y;,.y total. The weekly sample of the inactive (upper) pond, ,N ~.,~.~/,/`f, collected on March 24, showed 2.96 ppm Cid-wad and ~/ C 3.87 ppm CN-total. On March 26, a concern on the routing of overflow material from the cyanide mix tank was identified. The overflow from the mix tank was directed to the grinding area sump, then to tailings pump box, and finally to the tailings disposal area. The control valve on the make-up water line into the cyanide mix tank malfunctioned. An estimated 3 tank volumes (8600 gallons) containing a maximum of 6,000 pounds of sodiufi cyanide overflowed from the mix tank and reported to the tailings disposal area. The control valve on the water line to the cyanide mix tank has been repaired. Overflow material from the cyanide mix tank has been re-plumbed and is nmw directed to the leach circuit sumps where the material will be placed back into the milling process rather than sent to the tailings disposal area. with the overflow material entering the tailings disposal area, the cyanide concentrations in the active pond increased. The highest concentration was reported on March 27 with values of 6.97 ppm CN-wad and 9.49 ppm CN-total. By March 28, the cyanide levels had decreased to 4.33 ppm CN-wad and 8.67 ppm CN-total. The levels appear to be decreasing. As A SUR.S/DIARY OP RATTLE' h/OUNTA/N GOLF COMPANY N.O. BOX 3t0 SAN LUIS. COLORADO 81152-0310 (719) 672-336? FAX (719) 6723363