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
... cost is greatly reduced in attaining the same crushing capacity , the power required to run it is also much reduced . The difference in freight to many places would also be very great . The machine is made of different sizes , and ...
... cost is greatly reduced in attaining the same crushing capacity , the power required to run it is also much reduced . The difference in freight to many places would also be very great . The machine is made of different sizes , and ...
Halaman 35
... cost of delivering the ore , including wear and tear of machinery , interest on outlay , and running expense , is about twenty - five cents per ton per mile . The cost of constructing such a line is from $ 4,500 to $ 7,000 per mile ...
... cost of delivering the ore , including wear and tear of machinery , interest on outlay , and running expense , is about twenty - five cents per ton per mile . The cost of constructing such a line is from $ 4,500 to $ 7,000 per mile ...
Halaman 38
... COST , WEIGHT , AND EXPENSE OF WORKING . - By way of giving definite data as to ex- pense of machinery , I will ... cost per ton of working . Of course these figures vary according to locality , wood , and labor : 14 - ton mill . 3 - ton ...
... COST , WEIGHT , AND EXPENSE OF WORKING . - By way of giving definite data as to ex- pense of machinery , I will ... cost per ton of working . Of course these figures vary according to locality , wood , and labor : 14 - ton mill . 3 - ton ...
Halaman 41
... cost of $ 30 per foot , the same tunnel costing by hand - labor $ 46 per foot , besides running twice the number of feet per month as was run by hand . By recent improvements his drills can be placed at any angle and adjusted so as to ...
... cost of $ 30 per foot , the same tunnel costing by hand - labor $ 46 per foot , besides running twice the number of feet per month as was run by hand . By recent improvements his drills can be placed at any angle and adjusted so as to ...
Halaman 48
... cost of $ 15 per ton . The total cost on each ton , mining , etc. , included , when landed at Swansea , has been estimated at $ 50 . Labor was then $ 4 per day . At this rate only first- grade ores paid a profit ; and with increasing ...
... cost of $ 15 per ton . The total cost on each ton , mining , etc. , included , when landed at Swansea , has been estimated at $ 50 . Labor was then $ 4 per day . At this rate only first- grade ores paid a profit ; and with increasing ...
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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