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 halaman |
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Halaman 15
... latter gentleman , at my request , instituted a series of experiments , extending over a period of several months , with a view of testing the yield of gravel , and the expense of treatment by mill process , at French Corral . I am also ...
... latter gentleman , at my request , instituted a series of experiments , extending over a period of several months , with a view of testing the yield of gravel , and the expense of treatment by mill process , at French Corral . I am also ...
Halaman 27
... latter part of the year 1860 , since which time he has been engaged , with the aid of accomplished and energetic assist- ants , in making a thorough geological examination of the State , inter- rupted , however , from time to time , by ...
... latter part of the year 1860 , since which time he has been engaged , with the aid of accomplished and energetic assist- ants , in making a thorough geological examination of the State , inter- rupted , however , from time to time , by ...
Halaman 41
... latter ; and the use of the cylinder is equally familiar . Novelty may , however , be claimed for this combination of well - known contrivances . But it is open to another objection , which concerns me more than any question of novelty ...
... latter ; and the use of the cylinder is equally familiar . Novelty may , however , be claimed for this combination of well - known contrivances . But it is open to another objection , which concerns me more than any question of novelty ...
Halaman 45
... latter 19 mills , with an aggregate of 233 stamps . Returns from those counties would have materially run up the total under the heading of " tons crushed , " and shown , by comparison with the table of 1867-68 , a great increase in ...
... latter 19 mills , with an aggregate of 233 stamps . Returns from those counties would have materially run up the total under the heading of " tons crushed , " and shown , by comparison with the table of 1867-68 , a great increase in ...
Halaman 76
... latter parallel veins . None of these claims , except the Angel's Quartz Mining Com- pany and the Union , are being developed at present . East of the above , at Angel's , we find a series of narrow pocket - veins , known as the " Dead ...
... latter parallel veins . None of these claims , except the Angel's Quartz Mining Com- pany and the Union , are being developed at present . East of the above , at Angel's , we find a series of narrow pocket - veins , known as the " Dead ...
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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 metal metallurgy 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