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BATTLE MO[JNTAIN GOLD COMPANY <br />' s°i° c a'°r+°urv <br />I~'1'LklIFF1C'E CORR F.tiF'LIA LIL•.VC'L <br />January 24,1989 <br />Prue Baldrige <br />Steffen, Robertson and Kirsten <br />3232 Sarth Vance 5t. <br />' Lakewood, CO 80227 <br />Da3r Arun, <br />In response to the hLRD adequacy concern listed as Ji2o, Use tailing sa~rle was <br />' processed thrYx~gh flotation. A brief description of the processirg methods used follavs. <br />The sample was ground to 80% passing 250 mricrorls in the presence of 0.1E pounds <br />of potassitm amyl xanthate per ton of ore. The grbad sample was floated for approximately <br />five minutes using 0.05 pounds of glycol per ton of rn°e to maintain a stable froth bed. <br />The flotation tails were filtered. The flotation orxrcerrtrate was gramd to 80~ passing 75 <br />i microns. The concentrate slurry was adjusted to pH t1 with Type 3 Portland cement. 5odiun <br />cyanide was added at the rate of 8 pounds per ton of concentrate. The orxraent~ate was <br />leached for 48 hours at am5ient terperatrm~e. The cax~entrate slurry was filtered and the <br />filtrate wes recovered for analysis. The filter cake was rinsed with 250 grams of fresh <br />' c'ater' per 1000 grams of solids. The washed concentrate solids were rerarbined with the <br />flotation tails arrJ packaged for shiprrpnt. <br />' In response to the MJ~D adequacy concern listed as J/25, a brief processing de5crip- <br />tian follows, <br />San Luis are, agglrn>'rated with Type 3 Portland cement, was placed in a ~ inch dia- <br />meter colum. A dilute Sodium cyanide solution cantainirrg 1.0 pounds of scdiur Cyanide per <br />tan of solution was circulated throlrgh the ore at an application rate between 0.005 and <br />0.01 gallons per mirwtz pEr square foot. The solubalized precicxl5 metals were raroved from <br />' the solution by activated carbon. Circulation of the solution cmtinued until recovery of <br />the precious rretals diminished to an urrecorrmlical rate. AL the conclusion of leaching, the <br />solution flay was stepped and the col urn was allowed to drain far 16 to 24 bar's. The col- <br />' uml was rinsed wiUr one to four bed whims of fresh water. Rinse ~lutions were submitted <br />for- analysrs. <br />If I may be of further assistance or additional rnforn~tion is required, please call <br />rre. <br />' Beards, <br />~_ l~.j' <br />' Joel C. Lenz V <br /> <br />