Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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Halaman 7
... opened and made productive since the completion of the Pacific railroads , and the difficulty of obtaining correct informa- tion from them is enhanced by the complexity of their communications and financial connections . The means at my ...
... opened and made productive since the completion of the Pacific railroads , and the difficulty of obtaining correct informa- tion from them is enhanced by the complexity of their communications and financial connections . The means at my ...
Halaman 25
... opened and idle mills started up and operated with success , raising the presumption that many others now neglected would , in like manner , warrant a resumption of operations upon them . A large class of mining claims , too , that had ...
... opened and idle mills started up and operated with success , raising the presumption that many others now neglected would , in like manner , warrant a resumption of operations upon them . A large class of mining claims , too , that had ...
Halaman 35
... opened like a trap - door , by means of a lever , when they have accumulated to such an extent as to retard the grinding and pulverizing of the cement in the pan . Four revolving- arms are attached to a shaft which passes ...
... opened like a trap - door , by means of a lever , when they have accumulated to such an extent as to retard the grinding and pulverizing of the cement in the pan . Four revolving- arms are attached to a shaft which passes ...
Halaman 40
... opened , the blast will be delivered upon the grate ; and a reducing flame produced which will pass through the flue , g , into the chamber , F , and when the damper , j , is opened , oxygen will be supplied to the revolving cylinder ...
... opened , the blast will be delivered upon the grate ; and a reducing flame produced which will pass through the flue , g , into the chamber , F , and when the damper , j , is opened , oxygen will be supplied to the revolving cylinder ...
Halaman 47
... opened ; but in 1867 operations ceased . in consequence of the depreciation in the price of copper , and have not since been resumed . Up to the cessation of work the copper mines of California ( the most productive of which are in the ...
... opened ; but in 1867 operations ceased . in consequence of the depreciation in the price of copper , and have not since been resumed . Up to the cessation of work the copper mines of California ( the most productive of which are in the ...
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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 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