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
... supply . Those portions of the reports which discuss the geological , metallurgical , and mechanical problems involved in American mining have been widely studied , quoted , and discussed , and have done much , if I may credit the ...
... supply . Those portions of the reports which discuss the geological , metallurgical , and mechanical problems involved in American mining have been widely studied , quoted , and discussed , and have done much , if I may credit the ...
Halaman 20
... supply of water , have been 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 ...
... supply of water , have been 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 ...
Halaman 21
... supply large tracts of undeveloped ground of great promise . In like manner , many other great hydraulic works pro- jected will , when they come to be finished , contribute , more or less , to- wards swelling the aggregate bullion ...
... supply large tracts of undeveloped ground of great promise . In like manner , many other great hydraulic works pro- jected will , when they come to be finished , contribute , more or less , to- wards swelling the aggregate bullion ...
Halaman 23
... supply nearly one - third of the whole amount , and it is confidently expected that in five years more they will furnish enough to stop all requirement from abroad . No less than 350 tons are under constant treatment , and this large ...
... supply nearly one - third of the whole amount , and it is confidently expected that in five years more they will furnish enough to stop all requirement from abroad . No less than 350 tons are under constant treatment , and this large ...
Halaman 24
... supply for an entire year . " The company has also obtained possession of several thousand acres of valuable mining ground in the region to be supplied by water , and of a large area of timber and agricultural lands in the same section ...
... supply for an entire year . " The company has also obtained possession of several thousand acres of valuable mining ground in the region to be supplied by water , and of a large area of timber and agricultural lands in the same section ...
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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