C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/222
C22B 11/08 (2006.01)
Patent
CA 1094815
ABSTRACT OF THE INVENTION The recoverability by cyanidation of the gold content of sedimentary gold-bearing ores containing organic carbonaceous material and gold-bearing pyrite, or other gold-bearing sul- fides, is greatly increased by heating an aqueous slurry of the ore to about 167° to 212°F. and then introducing air or oxygen into the heated slurry to oxidize and eliminate a substantial portion of the carbonaceous material and oxidizable sulfides in the slurried ore, followed by cooling the slurry to about 70° to 85°F. and then introducing chlorine gas into the slurry to substantially complete the oxidation and chlorination of the carbonaceous content of the slurried ore. The ore is then sub- jected to conventional cyanidation to recover the gold content thereof.
288745
Newmont Exploration Limited
Osler Hoskin & Harcourt Llp
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