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 7
... increased , the ordinary duty of collecting , by personal inspection or correspondence , the statistical and technical information from the mining districts required for my annual reports , has also grown to double what it was four ...
... increased , the ordinary duty of collecting , by personal inspection or correspondence , the statistical and technical information from the mining districts required for my annual reports , has also grown to double what it was four ...
Halaman 20
... increased fully one - fourth . Owing to the introduction of improved machinery and modes of washing , as well as to the employment of more efficient metal- lurgical processes and labor - saving contrivances , the profit margin is being ...
... increased fully one - fourth . Owing to the introduction of improved machinery and modes of washing , as well as to the employment of more efficient metal- lurgical processes and labor - saving contrivances , the profit margin is being ...
Halaman 22
... increased capacity . We have already in San Francisco one of the most complete and capacious smelting establish- ments in the United States , and this is now undergoing extensive en- largement and improvement . A recent number of the ...
... increased capacity . We have already in San Francisco one of the most complete and capacious smelting establish- ments in the United States , and this is now undergoing extensive en- largement and improvement . A recent number of the ...
Halaman 23
... increased to 500 tons before the close of the present year . The lead product of these works is admitted to be equal to any other in the Union ; and large orders have been received from New York , for the purpose of converting the metal ...
... increased to 500 tons before the close of the present year . The lead product of these works is admitted to be equal to any other in the Union ; and large orders have been received from New York , for the purpose of converting the metal ...
Halaman 24
... increased to an unlimited extent , while the reservoirs that are to be constructed in connection with the work , and ... increasing sales in the future . But the great amount of water owned by the company will justify far more extended ...
... increased to an unlimited extent , while the reservoirs that are to be constructed in connection with the work , and ... increasing sales in the future . But the great amount of water owned by the company will justify far more extended ...
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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