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~ III IIIIIIIIIIIII III <br />999 <br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1313 Sherman St.. Room 215 <br />Denver. CO 80203 <br />303 866-3567 <br />FA x: 303 832-8106 <br />April 24, 1992 <br />Branka Tandi <br />Inco Exploration and Technical Services Inc. <br />2060 Flavelle Boulevard, Sheridan Park <br />Mississauga, Ontario L5K 1Z9 <br />CANADA <br />Dear Ms. Tandi: <br />STi~T~OF <br />:~)~~~1 is ~: <br />,~ ~. <br />;;> <br />Fib`-~r /.r~90 <br />~~ C, ..~o <br />~ /9 !6 ~ <br />Roy Romer. <br />~ Gvrernar <br />Michael B Long, <br />~~ yr <br />Drvisron Director <br />I am looking for technical information on the various metallurgical processes <br />for removing copper from metal cyanide circuits, and for decommissioning <br />cyanide tailings. You and I met briefly, last week, at Battle Mountain Gold <br />in San Luis, Colorado, and I thought you might be able to direct me toward <br />useful information. <br />The information I seek is detailed, technical, scientific engineerirg and <br />metallurgical data (not promotional literature) that explain the various <br />processes described above. This information would be useful to our Division <br />in evaluating cyanide processes from milling through decommissioninc. I am <br />especially interested in the Inco Process, although we need information on the <br />various other methods for removing copper from gold and silver in cyanide <br />leach systems, and for removing cyanide from tailings. <br />I would be very pleased if you could me this information or direct rte to <br />others who can provide it. If you have questions, please contact me. Thank <br />you. <br />Sincerely, <br />~~ ~ ~~ <br />Harry H. Posey <br />Reclamation Specialist <br />HHP/yjb <br />9981F <br />