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alluvium amalgam andesitic annual gold production auriferous gravels average bucket California Gold Production canyons cent channels chlorine concentration cost of mining counties country rock Cretaceous cyanide cyanide process dams debris deep gravels deep mining depth detrital discovery dredging gravels dredging operations drift mining duction early Eocene erosion exchange value feet flows flumes geologic gold and silver gold dredging gold industry gold mining gold quartz gold-bearing grade granitic Grass Valley gravel deposits hydraulic mining industry in California investment Kern County labor material METALLURGY metals mills miners mining in California mining industry mining methods mining operations Mother Lode Nevada City output period pipe placer gold placer mining present quartz mines quartz veins Quaternary range result rhyolitic rich riffles sands and gravels Sierra Nevada silver industry sluices streams sulphides sulphurets surface placers tailings tons Total Gold Production total gold yield treated volcanic washing zinc