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 33
... bottom of each alternate corrugation is a narrow slit through which the heavier material falls down into another riffle below with larger corrugations . Both riffles are set on the same grade , which should be about one foot in twelve ...
... bottom of each alternate corrugation is a narrow slit through which the heavier material falls down into another riffle below with larger corrugations . Both riffles are set on the same grade , which should be about one foot in twelve ...
Halaman 34
... bottom of the box is connected with a lever and a rod , and is shaken at each blow of the middle stamp of the battery by means of an upper tappet which strikes upon one arm of the lever . By this means motion is communicated to the ...
... bottom of the box is connected with a lever and a rod , and is shaken at each blow of the middle stamp of the battery by means of an upper tappet which strikes upon one arm of the lever . By this means motion is communicated to the ...
Halaman 35
... bottom of the pan , which is 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 ...
... bottom of the pan , which is 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 ...
Halaman 43
... bottom of the borings . If additional depth is desired the machines are set at work again , and a new set of deep barings is made . The sides and corners are found to be remarkably true and smooth . The drills here used are not annular ...
... bottom of the borings . If additional depth is desired the machines are set at work again , and a new set of deep barings is made . The sides and corners are found to be remarkably true and smooth . The drills here used are not annular ...
Halaman 44
... bottom by which it is secured when in opération . The other cylinder is seven inches long and five in diameter , and is secured on the top of the other at one end and parallel with it , the two being arranged somewhat like the barrels ...
... bottom by which it is secured when in opération . The other cylinder is seven inches long and five in diameter , and is secured on the top of the other at one end and parallel with it , the two being arranged somewhat like the barrels ...
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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 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