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
... total , $ 13.18 . Test No. 2. Same mill - tailings 350 feet from mill : silver , $ 3.93 ; gold , $ 5.02 ; total , $ 8.98 ; showing that a percentage secreted itself in its passage down stream . Test No. 3. Average yield of 150 tons ...
... total , $ 13.18 . Test No. 2. Same mill - tailings 350 feet from mill : silver , $ 3.93 ; gold , $ 5.02 ; total , $ 8.98 ; showing that a percentage secreted itself in its passage down stream . Test No. 3. Average yield of 150 tons ...
الصفحة 18
... Total . $ 12 06 $ 4 90 81 40 4 13 32 06 6 77 $ 16 96 116 46 10 90 The yield of Quartz Mountain ran 9 per cent . silver . The ores of all the counties of California carry silver , and my experiments show they run from 3 to 50 per cent ...
... Total . $ 12 06 $ 4 90 81 40 4 13 32 06 6 77 $ 16 96 116 46 10 90 The yield of Quartz Mountain ran 9 per cent . silver . The ores of all the counties of California carry silver , and my experiments show they run from 3 to 50 per cent ...
الصفحة 29
... are made in the central portions of the State , and in closer proximity to the mining region than those of other observers . April May June July August Total Months . Months . CONDITION OF MINING INDUSTRY - CALIFORNIA . 29.
... are made in the central portions of the State , and in closer proximity to the mining region than those of other observers . April May June July August Total Months . Months . CONDITION OF MINING INDUSTRY - CALIFORNIA . 29.
الصفحة 30
... Total Months . Months . April 0.821 1.693 May 1.808 0.355 0.742 0.460 2.252 0.008 0.270 0.648 0.756 0.808 June .. 0.011 0.000 0.087 0.000 0.100 0.000 Sprinkle . 0.008 Sprinkle . 0.001 0.053 July 0.000 0.000 0.000 0.004 0.018 0.000 0.000 ...
... Total Months . Months . April 0.821 1.693 May 1.808 0.355 0.742 0.460 2.252 0.008 0.270 0.648 0.756 0.808 June .. 0.011 0.000 0.087 0.000 0.100 0.000 Sprinkle . 0.008 Sprinkle . 0.001 0.053 July 0.000 0.000 0.000 0.004 0.018 0.000 0.000 ...
الصفحة 45
... Total claims surveyed , 72. Placer , 34 ; quartz , 33 ; quicksilver , 4 ; copper , 1. Many of these have been patented , and on the others patents are pending . Statistics of quartz - mills and mining ditches . - By the laws of Cali ...
... Total claims surveyed , 72. Placer , 34 ; quartz , 33 ; quicksilver , 4 ; copper , 1. Many of these have been patented , and on the others patents are pending . Statistics of quartz - mills and mining ditches . - By the laws of Cali ...
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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