Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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الصفحة 18
... copper , arsenic , or antimony , which is to be found in nearly all the gold ores of California , vitiates the mercury in a little while , rendering it quite inefficient in collecting even the gold that otherwise from gravity might be ...
... copper , arsenic , or antimony , which is to be found in nearly all the gold ores of California , vitiates the mercury in a little while , rendering it quite inefficient in collecting even the gold that otherwise from gravity might be ...
الصفحة 25
... copper mine , in Calaveras County , which , with the advantages of railroad traus- portation , it is believed can now be worked with profit . Among what may justly be ranked as new discoveries is a description of gold - bearing deposits ...
... copper mine , in Calaveras County , which , with the advantages of railroad traus- portation , it is believed can now be worked with profit . Among what may justly be ranked as new discoveries is a description of gold - bearing deposits ...
الصفحة 27
... copper region of the northwestern States under authority of the legislature of Wisconsin . Having accomplished this duty he departed for the new scenes of his labor and arrived in California during the latter part of the year 1860 ...
... copper region of the northwestern States under authority of the legislature of Wisconsin . Having accomplished this duty he departed for the new scenes of his labor and arrived in California during the latter part of the year 1860 ...
الصفحة 38
... copper , zinc , conveyers , and bolters , as follows : For mill of 1 - ton capacity per 24 hours .. For mill of 3 - ton capacity per 24 hours ... For mill of 6 - ton capacity per 24 hours .. For mill of 12 - ton capacity per 24 hours ...
... copper , zinc , conveyers , and bolters , as follows : For mill of 1 - ton capacity per 24 hours .. For mill of 3 - ton capacity per 24 hours ... For mill of 6 - ton capacity per 24 hours .. For mill of 12 - ton capacity per 24 hours ...
الصفحة 45
... Copper . Amador . Richards Placer Plumas . Nevada . Calaveras . Tuolumne . Staples & Co Placer El Dorado . Eclipse ... copper , 1. Many of these have been patented , and on the others patents are pending . Statistics of quartz ...
... Copper . Amador . Richards Placer Plumas . Nevada . Calaveras . Tuolumne . Staples & Co Placer El Dorado . Eclipse ... copper , 1. Many of these have been patented , and on the others patents are pending . Statistics of quartz ...
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50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California Cañon 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