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Leaching Agglomerated Gold-silver Ores.
Heinen-HJ; McClelland-GE; Lindstrom-RE
U S Pat 4 256 706 1981 Mar; :
Gold or silver is recovered from ores, tailings, or wastes by agglomerating the fines with a binding agent and cyanide solution, aging, and percolation leaching with nacn solution. Thus, a gold ore containing 0.23 Oz/ton au and some clay was agglomerated with 10 lb/ton of portland cement and a solution containing 2 lb/ton nacn. The aged mixture was leached with a solution containing 0.4 Lb/ton cyanide. The gold recovery was 91.2 pct.
U.S. Pat. 4,256,706, Mar. 17, 1981; Chem. Abstr. 94:87,869C