Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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Halaman 52
... feet , and a thickness of about 150 feet ; its elevation at Jamestown is about 500 feet above the surround- ing country . Beneath this capping of lava is a stratification of sand- stone sixty to one hundred feet in thickness ; and ...
... feet , and a thickness of about 150 feet ; its elevation at Jamestown is about 500 feet above the surround- ing country . Beneath this capping of lava is a stratification of sand- stone sixty to one hundred feet in thickness ; and ...
Halaman 53
... feet frontage on the Tuolumne River , near the town of La Grange , Stanislaus County , formerly known as French Bar , their ground run- ning back from the river a distance varying from one - half mile to one mile . The bed - rock lies ...
... feet frontage on the Tuolumne River , near the town of La Grange , Stanislaus County , formerly known as French Bar , their ground run- ning back from the river a distance varying from one - half mile to one mile . The bed - rock lies ...
Halaman 58
... feet thick , averaging 2 feet . The average pay of the rock is now about $ 44 per ton . Their tunnel is in 1,100 feet , on a level with the mill , to which the rock is easily taken by car . At the back of the tunnel they have sunk a ...
... feet thick , averaging 2 feet . The average pay of the rock is now about $ 44 per ton . Their tunnel is in 1,100 feet , on a level with the mill , to which the rock is easily taken by car . At the back of the tunnel they have sunk a ...
Halaman 61
... feet in depth , and have been worked over several times . The present population does not exceed three hun- dred . The future of the town depends on the quartz - mining on the Mother lode and the opening of the old channel underlying ...
... feet in depth , and have been worked over several times . The present population does not exceed three hun- dred . The future of the town depends on the quartz - mining on the Mother lode and the opening of the old channel underlying ...
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 past year . Their rock will run from $ 15 to $ 20 per ton . They have a shaft down 580 feet , on an incline of 60 ...
... feet long , and from 15 to 30 feet wide . They have a 25 - stamp mill , but it has only been run at intervals during past year . Their rock will run from $ 15 to $ 20 per ton . They have a shaft down 580 feet , on an incline of 60 ...
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50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California Caņon 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