Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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الصفحة 9
... amount of the estimated bullion product will be found in the appendix . The nature of the increase it exhibits is still more gratifying than its amount , since it shows clearly that the decline of production from superficial mining ...
... amount of the estimated bullion product will be found in the appendix . The nature of the increase it exhibits is still more gratifying than its amount , since it shows clearly that the decline of production from superficial mining ...
الصفحة 23
... amount , and it is confidently expected that in five years more they will furnish enough to stop all requirement from abroad . No less than 350 tons are under constant treatment , and this large amount will be increased to 500 tons ...
... amount , and it is confidently expected that in five years more they will furnish enough to stop all requirement from abroad . No less than 350 tons are under constant treatment , and this large amount will be increased to 500 tons ...
الصفحة 24
... amount needed by the company in working its own mines . 66 " Aside from the amount used in the mines , a vast quantity would be required for irrigation . Nearly all the cities mentioned would , it is cal- culated , take more or less ...
... amount needed by the company in working its own mines . 66 " Aside from the amount used in the mines , a vast quantity would be required for irrigation . Nearly all the cities mentioned would , it is cal- culated , take more or less ...
الصفحة 28
... amount of valuable information has already been collected , both of a geographical and geological character . It is confidently ex- pected that the final elaboration of all our materials , with the accompanying maps and sections , will ...
... amount of valuable information has already been collected , both of a geographical and geological character . It is confidently ex- pected that the final elaboration of all our materials , with the accompanying maps and sections , will ...
الصفحة 30
... amount in inches of each month , during twenty - three years , and for each rainy season ; also the mean quantity for every month , and the mean annual amount of rain . 1852 . 1853 . 1854 . 1855 . 0.250 0.000 1.000 1.500 0.000 0.180 ...
... amount in inches of each month , during twenty - three years , and for each rainy season ; also the mean quantity for every month , and the mean annual amount of rain . 1852 . 1853 . 1854 . 1855 . 0.250 0.000 1.000 1.500 0.000 0.180 ...
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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