Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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Halaman 22
... feet deep , all of which , though useless to the man without means , can , with the aid of capital , be made to yield up their treasures with profit . To work this class of mines to advantage it becomes necessary that a large area of ...
... feet deep , all of which , though useless to the man without means , can , with the aid of capital , be made to yield up their treasures with profit . To work this class of mines to advantage it becomes necessary that a large area of ...
Halaman 49
... feet ; but recent deep developments at various points would seem to indicate a tendency of these walls to narrow , which , at depths of from 1,000 to 1,200 feet , and in some cases less , would shut out the " horse " and develop a ...
... feet ; but recent deep developments at various points would seem to indicate a tendency of these walls to narrow , which , at depths of from 1,000 to 1,200 feet , and in some cases less , would shut out the " horse " and develop a ...
Halaman 52
... feet , and a thickness of about 150 feet ; its elevation at Jamestown is ... deep , have existed at that time , for this flow of lava is clearly seen to ... feet of vertical height . The excessive hardness of the basaltic capping of the ...
... feet , and a thickness of about 150 feet ; its elevation at Jamestown is ... deep , have existed at that time , for this flow of lava is clearly seen to ... feet of vertical height . The excessive hardness of the basaltic capping of the ...
Halaman 58
... feet , and intend erecting powerful machinery , as there is water- power enough to drive an unlimited number of ... deep ; at this point it is 800 feet below the surface . The Hites ' Cove mine ( described in report for 1871 ) is engaged ...
... feet , and intend erecting powerful machinery , as there is water- power enough to drive an unlimited number of ... deep ; at this point it is 800 feet below the surface . The Hites ' Cove mine ( described in report for 1871 ) is engaged ...
Halaman 62
... feet long , and from 15 to 30 feet wide . They have a 25 - stamp mill , but it has only been run at intervals during ... deep from the surface . The hanging - wall is of serpentine , and the foot - wall of slate formation . The vein is from 7 ...
... feet long , and from 15 to 30 feet wide . They have a 25 - stamp mill , but it has only been run at intervals during ... deep from the surface . The hanging - wall is of serpentine , and the foot - wall of slate formation . The vein is from 7 ...
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Istilah dan frasa umum
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