Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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Halaman 7
... portions of the reports which discuss the geological , metallurgical , and mechanical problems involved in American mining have been widely studied , quoted , and discussed , and have done much , if I may credit the testimony which has ...
... portions of the reports which discuss the geological , metallurgical , and mechanical problems involved in American mining have been widely studied , quoted , and discussed , and have done much , if I may credit the testimony which has ...
Halaman 13
... portion of the State , but several important districts are found in the extreme northern and southern parts of the State , as well as on the eastern slopes of the Sierras . The collection of information and statistics relative to the ...
... portion of the State , but several important districts are found in the extreme northern and southern parts of the State , as well as on the eastern slopes of the Sierras . The collection of information and statistics relative to the ...
Halaman 18
... portion from each . Reduce this sample to powder ; if too much for average assays , sample again as before . Get 3 or 5 assays from reliable assayers , average the assays . Work your ore by your mill process ; compare the results with ...
... portion from each . Reduce this sample to powder ; if too much for average assays , sample again as before . Get 3 or 5 assays from reliable assayers , average the assays . Work your ore by your mill process ; compare the results with ...
Halaman 20
... portion of the Pacific slope , as we have here many quartz mills dependent on water for their propulsive power , while placer washing constitutes , in favorable seasons , our most prolific source of gold production . But despite this ...
... portion of the Pacific slope , as we have here many quartz mills dependent on water for their propulsive power , while placer washing constitutes , in favorable seasons , our most prolific source of gold production . But despite this ...
Halaman 22
... portion of some one lode than was formerly the practice . So , too , in the erection of quartz - mills and reduc- tion - works , in the projection of ditches and reservoirs , in rigging up hydraulic apparatus , and in exploring the ...
... portion of some one lode than was formerly the practice . So , too , in the erection of quartz - mills and reduc- tion - works , in the projection of ditches and reservoirs , in rigging up hydraulic apparatus , and in exploring the ...
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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 metallurgy metals 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