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• <br /> <br />~~-r..~~~\xl <br />- - - -- a- <br />:.. <br />March 24, 1992 <br />Mr. Larry Oehler <br />Reclamation Specialist <br />Mined Land Reclamation Division <br />1313 Sherman St., Rm. 215 <br />Denver, CO 80203-2273 <br />Dear Mr. Oehler: <br />J AAA 3 ,~ 19g% <br />~`v.i.'' <br />~xhibitl <br />BPRLE MOUNNIN <br />GOID COMPPNV <br />The approved processing design for the San L is project <br />incorporated the use of a cyanide tailings detoxification system <br />referred to as AVR. The AVR system has been in us since the <br />mill began operating last year and has consistently a~hieved the <br />pH compliance criteria as set forth in the approved permit for <br />the facility. <br />The tailings pond was frozen over this past wi ter due to <br />one of the coldest winters on record for the San L is valley. <br />This past month as our pond began to thaw, Batt e Mountain <br />Resources' ("BMR") sampling of cyanide concentratio s revealed <br />levels higher than anticipated. <br />BMR believes that an expeditious response to i~he current <br />tailings pond cyanide levels is appropriate. We !propose to <br />reduce the cyanide levels in the pond through the addition of <br />zinc ferrous sulfate. This chemical is commonly used as a <br />cyanide detoxification chemical in the mining Indus ry and the <br />by-products of the detoxification reaction have been d monsLrated <br />to be stable and environmentally benign. In our view, the <br />procedure should be implemented as soon as possible, because of <br />the potential attraction of open water to waterfowl', during the <br />spring migration. Therefore, BMR intends to commence addition <br />of the zinc ferrous sulfate no later than March 31, 19192. Please <br />contact me immediately if you have any questions ~r concerns <br />whatsoever with this proposal. <br />For the longer term, BMR is currently conducting~an overall <br />performance evaluation of the AVR system and is etermining <br />whether alternative or additional detoxification technology could <br />be appropriate for the facility. We anticipate that evaluation <br />to be completed on or about May 1, 1992. BMR intends~to provide <br />your office with the results of the study alone with its <br />conclusions regardinc pe-`^rnance of the system an potential <br />.:~rl U iTRPPT ~'•It .'I ~ ~ ~ - ...~. ~ ~ ~'. - .~,.: n_;n to ff LF\-n inni <br />