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ADA TECHNOLO~ IE'S Iha+= . TEL ~ ;03-7 a_-55~~ Jun ! i9 ?_ ;0 ~ O r No .002 F , 02 <br />• • <br />June 9, 1992 <br />Dr. James A. Pendleton <br />Technical and Scient'if'ic Coordinator <br />Colorado Mined Land Reclamation Division <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 89203 <br />bear Dr. Pendleton <br />I am in receipt of the copy of "Technical Revision No. 007, Tailings Cyanide 1Detoxification <br />Using Hydrogen Peroxide" referring to the San Luis Project, Permit No, M-88+-112, as <br />forwarded to your office from Mr. Andre J. Douchane of Battle Mountain Gold Company. <br />My copy of the document was received from the offices of Mr, Dean Massey do June ], <br />1992. <br />The following comments refer to the details of the Technical Revision and to the <br />relationship this proposed new approach to reducing ryanide in the San Luis tailings <br />pond(s) bears to the on-going CYTOX process at this site: <br />o The proposed use of hydrogen peroxide to reduce cyanide in the polnds is <br />relatively proven according to the document, but then is no data to <br />demonstrate that the target level of 4 ppm total cyanide can be achieved <br />by this method. <br />o The use of the CYTOX process in combination with the petoidde <br />treatment ie confusing since the Insoluble products of the CYTOX reagent <br />(iron•tine-cyanide complexes) will be deposited in the talilings <br />impoundment and thus provide a Puture threat of cyanide release under <br />some conditions. <br />The llmlted water analysis data I have seen for the tailings pond water <br />indicates relatively low levels of Iron and high copper levels (without <br />CYTOX reagent addition) and thus we would expect that petbxide <br />ALONE would destroy both free and copper-complexed cyanide without <br />the use of the CYTOX process as an adJuact. <br />L060992DEH1 <br />