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Auriferous Black Sandc of California
CHAPTER THREE TECimOLOGY
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alluvium amalgam andesitic annual gold production auriferous gravels average bed-rock 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 dredging gravels drift mining early Eocene erosion exchange value feet flows flumes geologic gold and silver gold dredging gold industry gold mining gold quartz gold-bearing 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 ooo║ooo║║║ output period pipe placer gold placer mining present quartz mines quartz veins Quaternary Quaternary gravels range result rhyolitic rich riffles river beds Sierra Nevada silver industry Siskiyou counties sluices streams sulphides sulphurets surface placers tailings tons total gold yield treated tunnel valley border volcanic washing zinc