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Auriferous Black Sands of California
CHAPTER THREE TECHNOLOGY º
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amalgam amount annual areas auriferous gravels average became beds border California canyons carried cent channels Chapter concentration considerable consist contain continuous cost counties covered debris deep deposits depth direct discovery districts drift mining early economic effect elevations entirely erosion evidence extensive feet figures flows future gold and silver gold dredging gold industry gold mining gold production gold-bearing grade Grass gravels ground hydraulic mining important increasing investment labor latter less limited lower material means metals method miles mills miners mining industry Mother Lode necessary obtained operations output pass period phase pipe practically present pressure principal probably quartz mines Quaternary range reserves result rich rivers rock sands Sierra Nevada slopes sluices solutions streams successful surface placers tailings Tertiary treated upper Valley various veins washing yield