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<br />• <br />_~ <br />III IIIIIIIilllllill ~ <br />Gd bent F Rmtlahl, P.E. <br />C. Jay Silvernale <br />Bruce G. R~ndahl <br />Rindahl 8r a:satiates • 2305 S. Syracuse Way • Suite 27 7 • Denver, CO 80231 • (3031 696-6846 <br />February 11, 1955 <br />RECEIVED <br />FEB 19 1985 <br />Mr. Philip C. Saletta MINED LANDRECIAMATIONDIVISIDN <br />Mined Land Reclamation Division 0010. Dept Of Natural Re90U~CB5 <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />RE: Mine Development, Inc. - Neglected Mine; Permit No. 81-165 <br />Dear Phil: <br />The following comments are in response to yocr letter of <br />Nc~emter 21, 1964. <br />1, This is a closed system. in that all solutions are <br />recirculated and Wore Nill be disct.arged. <br />Z The volume of the operating solutior is 25,000 gallon=. The <br />concentration of free (or total cyanide) in these solutions <br />is less than 1.0°0. Tests of the concentration will be Trade <br />every four hours of operation. Permanent records will be <br />kept. Cyanide is added to the process at the point of agglo- <br />meration or injected into the eirecit after the carbcn <br />columns. <br />The cyanide is stored on site in steel drums in a locked <br />building. Calcium Hypochlorite is kept on site as a neutra- <br />lizing agent. <br />3. The pipes from 'the heap to the carbcn columns will be encased <br />in 6" PVC pipe to preclude loss cf solutior, in case of a pipe <br />break. If such a break would occur, the flow of solution <br />would return to the heap. <br />4. The four fact depth of the leach solution refers to the heap. <br />The heap is cort.ained in a pit 16C' X 6C' ant' 15' deep lined <br />with 30 mil Hypolon. The 15' berm coctains the heap and <br />solution. The pore space volume of the heap is approximately <br />10°t of the volume of the heap. <br />Engineering & Environmental Services <br />•` t•. <br />~~ <br />••.r~` <br />