Silver and Gold: an Account of the Mining and Metallurgical Industry of the United States: With Reference Chiefly to the Precious MetalsJ.B. Ford, 1873 - 566 halaman |
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Halaman 18
... Mountain ran 9 per cent . silver . The ores of all the counties of California carry silver , and my experiments show they run from 3 to 50 per cent . of the yield . The closer the concentration from batteries , the higher is the ...
... Mountain ran 9 per cent . silver . The ores of all the counties of California carry silver , and my experiments show they run from 3 to 50 per cent . of the yield . The closer the concentration from batteries , the higher is the ...
Halaman 24
... Mountains , in El Dorado County , at an elevation of from three to five thousand feet above the sea . lakes are fed by streams from mountain peaks and gorges of perpetual snow , and are capable of furnishing a constant stream of 40,000 ...
... Mountains , in El Dorado County , at an elevation of from three to five thousand feet above the sea . lakes are fed by streams from mountain peaks and gorges of perpetual snow , and are capable of furnishing a constant stream of 40,000 ...
Halaman 25
... Mountains , have been utilized and it will not be long before all of them will be made practically available . When ... mountain streams , and thence distributing them as required by the wants of the miners during the dry season . These ...
... Mountains , have been utilized and it will not be long before all of them will be made practically available . When ... mountain streams , and thence distributing them as required by the wants of the miners during the dry season . These ...
Halaman 49
... Mountain , Whisky Hill , and Carson Hill . At these points the lode has widened with the " blossom " of the mountain , and presents the appearance of a system of parallel veins separated on the surface , and to an indefinite depth , by ...
... Mountain , Whisky Hill , and Carson Hill . At these points the lode has widened with the " blossom " of the mountain , and presents the appearance of a system of parallel veins separated on the surface , and to an indefinite depth , by ...
Halaman 51
... Mountain , at places where bars evidently existed in the ancient river , and the lava flow sought the deep channel , forming an elbow or curve on which the lava crust was very thin , or sometimes entirely denuded . Table Mountain ...
... Mountain , at places where bars evidently existed in the ancient river , and the lava flow sought the deep channel , forming an elbow or curve on which the lava crust was very thin , or sometimes entirely denuded . Table Mountain ...
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50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California CaƱon carbonate cent chemical claim coal commenced company's contains copper cost County course Creek Cupellation December deposits depth developed district ditch drift drill east El Dorado County engine erected Eureka expense extracted feet deep feet in length feet long feet wide furnace galena gangue gold Gold Hill gravel ground Gulch Hill hundred hydraulic inches incline iron labor lead ledge limestone located lode metal metallurgy miles mill miners Mining Company months nearly Nevada opened operations ounces owners placer mines pounds present Professor prospecting quantity quartz quartzite rich River rock San Francisco silver slag slate smelting smelting-works stamps stopes sulphurets sunk supply surface Table Mountain tailings thick tion tons Total tunnel Tuolumne County tuyeres Valley vein width yield