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 70
... arrastra . A 10 - stamp quartz - mill at the Thorn mine , and a 10 - stamp quartz - mill at the Union mine , are in ... ( arrastra ) attached , with 32- feet overshot water - wheel . The yield has been $ 18,500 . Clark & Co. have ...
... arrastra . A 10 - stamp quartz - mill at the Thorn mine , and a 10 - stamp quartz - mill at the Union mine , are in ... ( arrastra ) attached , with 32- feet overshot water - wheel . The yield has been $ 18,500 . Clark & Co. have ...
الصفحة 72
... arrastra . Expense of milling , per cubic yard Expense of extracting , per cubic yard . Yield of one cubic yard of ground Total yield of claim in one year . Wages paid to underground - drifters Number of men working . Composition of ...
... arrastra . Expense of milling , per cubic yard Expense of extracting , per cubic yard . Yield of one cubic yard of ground Total yield of claim in one year . Wages paid to underground - drifters Number of men working . Composition of ...
الصفحة 122
... arrastra occasionally , or pounding out gold in a hand - mortar . " Another paper of later date says : " At Greene's ( the old ' Mallet ' ) ledge , supposed by some to be on the Good Friday ledge of the Ophir Company , they have within ...
... arrastra occasionally , or pounding out gold in a hand - mortar . " Another paper of later date says : " At Greene's ( the old ' Mallet ' ) ledge , supposed by some to be on the Good Friday ledge of the Ophir Company , they have within ...
الصفحة 123
... arrastra reduction . The Fra- ser River excitement broke out and the owners all sold out or abandoned their claims . Some San Francisco capitalists recently bought the entire hill containing eight paral- lel lodes within a compass of ...
... arrastra reduction . The Fra- ser River excitement broke out and the owners all sold out or abandoned their claims . Some San Francisco capitalists recently bought the entire hill containing eight paral- lel lodes within a compass of ...
الصفحة 256
... arrastra , and pay from four to eight dollars a ton freight , and about $ 20 dollars for crushing . About a ton in twenty - four hours could he crushed , and so people came to the conclusion that it would not pay . Early in the spring ...
... arrastra , and pay from four to eight dollars a ton freight , and about $ 20 dollars for crushing . About a ton in twenty - four hours could he crushed , and so people came to the conclusion that it would not pay . Early in the spring ...
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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