Tungsten and gold recovery from Alaskan scheelite-bearing ores
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      "Investigations were conducted by the U.S. Bureau of Mines to develop flowsheets for the recovery of tungsten and gold from four Alaskan scheelite-bearing ores. Basic gravity concentration and cyanide leach tests were performed on all samples. About 46 pct of the tungsten and 30 pct of the gold from one sample were recovered in a gravity concentrate containing 24 pct wo3 (tungstic oxide) and 119 troy ounces per short ton (tr oz/st) au. Froth flotation of the gravity concentrate resulted in separate tungsten and gold products with grades of 38 pct wo3 and 2,720 tr oz/st au and recoveries of 60 and 97 pct, respectively. Additional gold was recovered from the gravity and flotation tailings by cyanidation. Overall recoveries of tungsten and gold from this sample were 28 and 94 pct, respectively. A flowsheet with mill design parameters was developed that consisted of (1) free gold and scheelite recovery by gravity methods and froth flotation and (2) fine-grained gold recovery by cyanide leaching of reground gravity and flotation tailings, followed by a carbon-in-pulp (cip) circuit. Data were developed form the bond mill work index, gold and tungsten flotation, conventional and high-rate thickening, cyanide leaching, and cip adsorption tests." - NIOSHTIC-2 NIOSHTIC no. 10007254
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