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 51
... yielding high - grade rock , but few of which are developed below the water - line . The future of these ... yield a larger amount of gold per cubic yard . This opinion is based on personal observation , and on the carefully ...
... yielding high - grade rock , but few of which are developed below the water - line . The future of these ... yield a larger amount of gold per cubic yard . This opinion is based on personal observation , and on the carefully ...
الصفحة 55
... yield of a tract of mining ground in early times must be accepted with due allowance for local exaggeration , it is ... Yield of cement gravel washed Total yield last year CONDITION OF MINING INDUSTRY- CALIFORNIA . 55.
... yield of a tract of mining ground in early times must be accepted with due allowance for local exaggeration , it is ... Yield of cement gravel washed Total yield last year CONDITION OF MINING INDUSTRY- CALIFORNIA . 55.
الصفحة 63
... yield of the gravel . The thickness of the pay gravel varies from four to six feet - the richest being on the bed ... yield of five to six dollars per car - load , equivalent to $ 10 per cubic yard ; but this " run " was on very ...
... yield of the gravel . The thickness of the pay gravel varies from four to six feet - the richest being on the bed ... yield of five to six dollars per car - load , equivalent to $ 10 per cubic yard ; but this " run " was on very ...
الصفحة 64
... yield is from $ 2 50 to $ 3 per car - load , and is considered good pay . The gravel sometimes yields much higher , rarely lower . This is a little less than $ 5 per cubic yard . Mr. Hughes has used these pans for several years in ...
... yield is from $ 2 50 to $ 3 per car - load , and is considered good pay . The gravel sometimes yields much higher , rarely lower . This is a little less than $ 5 per cubic yard . Mr. Hughes has used these pans for several years in ...
الصفحة 67
... yields an average of nearly $ 75 per ton . The south drifts are wider , sometimes attaining a width of sixteen feet , and the yield from this part of the mine is from $ 12 to $ 15 per ton . The pay - chute , or chimney , as far as ...
... yields an average of nearly $ 75 per ton . The south drifts are wider , sometimes attaining a width of sixteen feet , and the yield from this part of the mine is from $ 12 to $ 15 per ton . The pay - chute , or chimney , as far 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