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adit Alaska American Anaconda Arizona assay average became Black Hills brought built Butte California Calumet canyon Carson river cent of copper chalcocite claim Clark Colorado Comstock Comstock lode concentrate Consolidated Copper Company cost creek deposits diamonds diggings discovered discovery district dividends Douglas early enterprise expedition exploration feet flotation furnace galena gold gravel ground gulch H. H. Bancroft Indians industry iron Juneau Lake Superior later lead Leadville located lode metal Mexican Mexico miles mill Minerals Separation Mining and Scientific Mining Company mining engineer Mississippi Montana Mormon mountains named native copper obtained operations orebody outcrop output party patent plant production profit prospecting prospectors proved quartz region rich river rock San Francisco schist Scientific Press shaft shares smelter smelting sold soon started sulphide surface T. A. Rickard territory tion tons treated United Verde United Verde Extension Utah valley veins Virginia City whereupon yielded