Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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النتائج 1-5 من 93
الصفحة 17
... mill - tailings 350 feet from mill : silver , $ 3.93 ; gold , $ 5.02 ; total , $ 8.98 ; showing that a percentage secreted itself in its passage down stream . Test No. 3. Average yield of 150 tons , $ 3.50 . Assays of tailings ...
... mill - tailings 350 feet from mill : silver , $ 3.93 ; gold , $ 5.02 ; total , $ 8.98 ; showing that a percentage secreted itself in its passage down stream . Test No. 3. Average yield of 150 tons , $ 3.50 . Assays of tailings ...
الصفحة 35
... mill - site or location for a furnace frequently requires a large outlay of money in the construction of a wagon - road or tramway , and a consequent expense in the hauling and transportation of ores , which prevent the profitable ...
... mill - site or location for a furnace frequently requires a large outlay of money in the construction of a wagon - road or tramway , and a consequent expense in the hauling and transportation of ores , which prevent the profitable ...
الصفحة 36
... mill at this place is received , and we here cheerfully comply as follows : We reduced 22 tons of ore from the Auburn mine , owned by Messrs . Wright & Wentworth , containing besides gold and silver , magnetic iron , carbonate oxide ...
... mill at this place is received , and we here cheerfully comply as follows : We reduced 22 tons of ore from the Auburn mine , owned by Messrs . Wright & Wentworth , containing besides gold and silver , magnetic iron , carbonate oxide ...
الصفحة 38
... mill . 3 - ton mill . 6 - ton mill . 12 - ton mill . 24 - ton mill . Power . Cost per ton of working . 5 - horse . $ 7 50 to $ 10 00 8 - horse . Weight . 2 tons . .4 tons . .7 tons . 15 - horse . .12 tons . 25 - horse . .24 tous . 45 ...
... mill . 3 - ton mill . 6 - ton mill . 12 - ton mill . 24 - ton mill . Power . Cost per ton of working . 5 - horse . $ 7 50 to $ 10 00 8 - horse . Weight . 2 tons . .4 tons . .7 tons . 15 - horse . .12 tons . 25 - horse . .24 tous . 45 ...
الصفحة 58
... mill . The vein is from 1 to 8 feet thick , averaging 21 feet . The average pay of the rock is now about $ 44 per ton . Their tunnel is in 1,100 feet , on a level with the mill , to which the rock is easily taken by car . At the back of ...
... mill . The vein is from 1 to 8 feet thick , averaging 21 feet . The average pay of the rock is now about $ 44 per ton . Their tunnel is in 1,100 feet , on a level with the mill , to which the rock is easily taken by car . At the back of ...
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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