Recovering Gold from Stripping Waste and Ore by Percolation Cyanide Leaching

摘要

Simple and low-cost heap and vat percolation cyanide leaching methods were applied on a laboratory scale for recovering gold from submarginal mine strip material and from ores representative of deposits with limited reserves not justifying construction of a conventional cyanide treatment plant. Gold-bearing material, as coarse as 4 inches in size and assaying from 0.06 to 0.6 troy ounce per ton, was leached successfully with dilute cyanide-lime solutions. From 66 to 95 percent of the gold in the samples was dissolved and recovered in activated carbon. The amenable ores and materials invariably contained micron-size gold distributed throughout a porous, relatively cyanicide-free gangue. (Author)