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 51
... feet wide . In these occur the quartz veins , the quartz occupying only a portion of the space , ( 3 to 9 feet , ) the balance being filled by an accompanying vein matter differing from the country rock , and not found outside of the ...
... feet wide . In these occur the quartz veins , the quartz occupying only a portion of the space , ( 3 to 9 feet , ) the balance being filled by an accompanying vein matter differing from the country rock , and not found outside of the ...
الصفحة 53
... feet frontage on the Tuolumne River , near the town of La Grange , Stanislaus County , formerly known as French Bar ... wide on the bottom , eight feet on the top , and four feet deep , with a fall or grade of from six to ten feet ...
... feet frontage on the Tuolumne River , near the town of La Grange , Stanislaus County , formerly known as French Bar ... wide on the bottom , eight feet on the top , and four feet deep , with a fall or grade of from six to ten feet ...
الصفحة 56
... wide of the mark . And our own work in this direction is by no means as yet complete . What the true theory is ... feet , except in places where the limestone formation contracts , and at these points it has been worked to a depth of from ...
... wide of the mark . And our own work in this direction is by no means as yet complete . What the true theory is ... feet , except in places where the limestone formation contracts , and at these points it has been worked to a depth of from ...
الصفحة 61
... feet in depth , and have been worked over several times . The present population does not exceed three hun- dred ... wide ; 8 feet of this vein - matter is hard white quartz , and 6 feet are a mixture of soft slate and broken ...
... feet in depth , and have been worked over several times . The present population does not exceed three hun- dred ... wide ; 8 feet of this vein - matter is hard white quartz , and 6 feet are a mixture of soft slate and broken ...
الصفحة 62
... 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 ° . The hoisting - works are ...
... 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 ° . The hoisting - works are ...
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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