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 من الصفحات |
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الصفحة 17
... feet from mill : silver , $ 3.93 ; gold , $ 5.02 ; total , $ 8.98 ; showing ... 50 pounds of tailings for a party who took them a mile below his mill , and ... 50 per cent . , and , in the majority of mills , all of 60 per cent ...
... feet from mill : silver , $ 3.93 ; gold , $ 5.02 ; total , $ 8.98 ; showing ... 50 pounds of tailings for a party who took them a mile below his mill , and ... 50 per cent . , and , in the majority of mills , all of 60 per cent ...
الصفحة 31
... feet above sea - level , the fall of rain has been more than double that of the valleys . Higher up in the Sierras ... 50 30.27 51 0.10 December 3 30.30 51 December 4 30.38 54 December 5 31.31 50 December 6 30.17 49 December 7 ...
... feet above sea - level , the fall of rain has been more than double that of the valleys . Higher up in the Sierras ... 50 30.27 51 0.10 December 3 30.30 51 December 4 30.38 54 December 5 31.31 50 December 6 30.17 49 December 7 ...
الصفحة 35
... 50 to 150 pounds of ore or other material . The rope travels two hundred feet per minute ; the posts with the bearing pulleys on are usually two hundred feet apart , the hooks holding the ore - sacks being placed about fifty feet ...
... 50 to 150 pounds of ore or other material . The rope travels two hundred feet per minute ; the posts with the bearing pulleys on are usually two hundred feet apart , the hooks holding the ore - sacks being placed about fifty feet ...
الصفحة 50
... feet , disclosing a vein of from 12 to 14 feet in width . The quality of the quartz here has improved with each ... 50 MINING STATISTICS WEST OF THE ROCKY MOUNTAINS .
... feet , disclosing a vein of from 12 to 14 feet in width . The quality of the quartz here has improved with each ... 50 MINING STATISTICS WEST OF THE ROCKY MOUNTAINS .
الصفحة 55
... fifty feet , they commenced a tunnel , and had run one thousand three hundred and thirty - five feet up to November , 1871. They had four hundred feet more to run to strike the bed - rock of the basin . Their tunnel is about five by ...
... fifty feet , they commenced a tunnel , and had run one thousand three hundred and thirty - five feet up to November , 1871. They had four hundred feet more to run to strike the bed - rock of the basin . Their tunnel is about five by ...
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50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California Cañon 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