CHARACTERIZATION AND FLOTATION OF GOLD IN CARBON FINES AT THE FORT KNOX MINE, ALASKA

摘要

At the Fort Knox Mine, Fairbanks, Alaska, carbonrnfines are generated during stripping, acid washingrnand kiln regeneration operations. Carbon fines arerncollected by a filter press because of their goldrnvalue. Samples of the carbon fines show that theyrnconsist of 20-30% carbon, 70-80% grit and 0.17-rn0.68 kg/t (5.0-19.9 oz/st) gold. About 80% of therngold values in the carbon fines used in this study arernin a form of recrystallized free gold grains, with thernbalance being adsorbed gold on the carbon. Highrnrecoveries of gold and carbon were obtained inrnlaboratory tests using froth flotation, with a highrnrejection of the grit.