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 17
... cent . of what was his average working . I also made a test of three - fourths of a ton , and the result showed the loss in the mill - working to be 63 per cent . From what attention I have given the subject in actual labor , as well as ...
... cent . of what was his average working . I also made a test of three - fourths of a ton , and the result showed the loss in the mill - working to be 63 per cent . From what attention I have given the subject in actual labor , as well as ...
Halaman 18
... cent . silver . The ores of all the counties of California carry silver , and my experiments show they run from 3 to 50 per cent . of the yield . The closer the concentration from batteries , the higher is the percentage of silver . It ...
... cent . silver . The ores of all the counties of California carry silver , and my experiments show they run from 3 to 50 per cent . of the yield . The closer the concentration from batteries , the higher is the percentage of silver . It ...
Halaman 21
... cent . in the course of a few months and be able to maintain themselves permanently at this advance . English promoters have made the further mistake of exacting an inordinate commission for their services , necessitating the holders of ...
... cent . in the course of a few months and be able to maintain themselves permanently at this advance . English promoters have made the further mistake of exacting an inordinate commission for their services , necessitating the holders of ...
Halaman 31
... cent . more than in the great valleys of the Sacramento and San Joaquin . In Nevada City , at an elevation of about 2,500 feet above sea - level , the fall of rain has been more than double that of the valleys . Higher up in the Sierras ...
... cent . more than in the great valleys of the Sacramento and San Joaquin . In Nevada City , at an elevation of about 2,500 feet above sea - level , the fall of rain has been more than double that of the valleys . Higher up in the Sierras ...
Halaman 58
... cent . of sulphurets , worth from $ 100 to $ 300 per ton . The pay chute is of unusual length , and is already traced and tested for 1,900 feet . The company have 3,000 feet of lode . There are many other mines in the county in various ...
... cent . of sulphurets , worth from $ 100 to $ 300 per ton . The pay chute is of unusual length , and is already traced and tested for 1,900 feet . The company have 3,000 feet of lode . There are many other mines in the county in various ...
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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