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14-inch rolls Amalgamation amounts arts and industries Assay assay office Average-grade Cripple Creek ball mill bank bimetallism Bureau of Mines calcines Calcium Sulphate Chilean mills Colorado Iron Colorado Springs comminuters commodity concentrates continuous Dorr agitator conveyor copper countries cyanide solutions cyanide treatment decrease Denver Equipment Dorr bowl classifier Dorr tray thickener duplex classifier economic feed figure filter flotation tailings gold and silver gold coins gold content gold problem gold production gold standard gold's Golden Cycle plant Graphite I I I I I I I I I Iron Works ball Lead acetate lignite Low-grade Cripple Creek Merrill metal monetary stocks output oxidized paper Pilot table pounds present pyrometers recovery of gold red heat roasting and cyanide sand leaching Scott Turner silver production slime leaching sodium cyanide South Africa stocks of gold Storage bins sub-A flotation machine sulphides sump Symons cone crusher temperature tons treated United States Bureau Vezin sampler