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 من الصفحات |
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الصفحة 33
... tons per twenty- four hours , according to size . Whatever may be the results of its practical working on a large scale , there can be no doubt that it will prove an invaluable invention on ac- count of its lightness , portability , and ...
... tons per twenty- four hours , according to size . Whatever may be the results of its practical working on a large scale , there can be no doubt that it will prove an invaluable invention on ac- count of its lightness , portability , and ...
الصفحة 36
... tons of ore from the Auburn mine , owned by Messrs . Wright & Wentworth , containing besides gold and silver , magnetic iron , carbonate oxide , and sulphuret of lead , and has always been considered of a very refractory nature . The 22 ...
... tons of ore from the Auburn mine , owned by Messrs . Wright & Wentworth , containing besides gold and silver , magnetic iron , carbonate oxide , and sulphuret of lead , and has always been considered of a very refractory nature . The 22 ...
الصفحة 38
... ton mill 12 - ton mill .. 24 - ton mill . Weight . Power . Cost per ton of working . 24 tons . 5 - horse . $ 7 50 to $ 10 00 41⁄2 tons . 8 - horse . 500 to 7 50 7 tons . 15 - horse . 400 to 600 12 tons . 25 - horse . 3 50 to 4 50 300 to 4 ...
... ton mill 12 - ton mill .. 24 - ton mill . Weight . Power . Cost per ton of working . 24 tons . 5 - horse . $ 7 50 to $ 10 00 41⁄2 tons . 8 - horse . 500 to 7 50 7 tons . 15 - horse . 400 to 600 12 tons . 25 - horse . 3 50 to 4 50 300 to 4 ...
الصفحة 48
... ton , the distance being thirty - six miles . From that point it cost $ 2 per ton to San Francisco , whence it was ... tons , with prospects of a continued diminution . On the other hand , the demand for this metal is increasing ...
... ton , the distance being thirty - six miles . From that point it cost $ 2 per ton to San Francisco , whence it was ... tons , with prospects of a continued diminution . On the other hand , the demand for this metal is increasing ...
الصفحة 76
... tons a day by the use of this contrivance , besides saving much expense for labor . The mill now runs about fifty - five tons per day , and the yield of the quartz is from $ 6 to $ 20 per ton , with a constantly increasing yield as ...
... tons a day by the use of this contrivance , besides saving much expense for labor . The mill now runs about fifty - five tons per day , and the yield of the quartz is from $ 6 to $ 20 per ton , with a constantly increasing yield as ...
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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