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Method for aqueous gold thiosulfate extraction using copper-cyanide pretreated carbon adsorption

United States Patent

August 6, 2013
View the Complete Patent at the US Patent & Trademark Office
A gold thiosulfate leaching process uses carbon to remove gold from the leach liquor. The activated carbon is pretreated with copper cyanide. A copper (on the carbon) to gold (in solution) ratio of at least 1.5 optimizes gold recovery from solution. To recover the gold from the carbon, conventional elution technology works but is dependent on the copper to gold ratio on the carbon.
Young; Courtney (Butte, MT), Melashvili; Mariam (Vancouver, CA), Gow; Nicholas V. (Butte, MT)
13/ 094,139
April 26, 2011
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under Grant Nos. DE-FC26-02NT41607 and DE-FC26-05NT42457 awarded by the Department of Energy. The government has certain rights in the invention.