Statistics of Mines and Mining in the States and Territories West of the Rocky Mountains: Being the ... Annual Report, Masalah 4U.S. Government Printing Office, 1873 |
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Halaman 14
... stamp - mills in your district , with number of stamps , & c . A statement of the ruling rates of wages in your district . In districts or counties where the principal interest is gravel or hydraulic mining , the estimated area of ...
... stamp - mills in your district , with number of stamps , & c . A statement of the ruling rates of wages in your district . In districts or counties where the principal interest is gravel or hydraulic mining , the estimated area of ...
Halaman 18
... stamps , apply the power , and let them rip away , smashing rocks , to wash over blankets and copper plates ; and all is done with a stream of water to wash the sands off , forgetting that it is equally as potent to wash off the smaller ...
... stamps , apply the power , and let them rip away , smashing rocks , to wash over blankets and copper plates ; and all is done with a stream of water to wash the sands off , forgetting that it is equally as potent to wash off the smaller ...
Halaman 22
... stamps . The erection of several sixty- stamp mills is now in contemplation , and it seems probable that those hereafter constructed will generally be of large size . In the districts where the ores require reduction by smelting ...
... stamps . The erection of several sixty- stamp mills is now in contemplation , and it seems probable that those hereafter constructed will generally be of large size . In the districts where the ores require reduction by smelting ...
Halaman 32
... stamps on the principle of the tilt or trip - hammer , whereby quick , sharp blows are made , with very light stamps , and with less proportionate power , according to weight of stamp and frequency of blows , than is required in ...
... stamps on the principle of the tilt or trip - hammer , whereby quick , sharp blows are made , with very light stamps , and with less proportionate power , according to weight of stamp and frequency of blows , than is required in ...
Halaman 33
... stamp . A 5 - stamp battery of this construction strikes 2,000 blows per minute ; and while the first cost is greatly reduced in attaining the same crushing capacity , the power required to run it is also much reduced . The difference ...
... stamp . A 5 - stamp battery of this construction strikes 2,000 blows per minute ; and while the first cost is greatly reduced in attaining the same crushing capacity , the power required to run it is also much reduced . The difference ...
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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 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 Montana 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