Statistics of Mines and Mining in the States and Territories West of the Rocky Mountains, Utgave 8U.S. Government Printing Office, 1877 |
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Statistics of Mines and Mining in the States and Territories West of the ... Rossiter Worthington Raymond Uten tilgangsbegrensning - 1877 |
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amount assay average bed-rock bullion cañon carried cent chloride claim concentration Consolidated contains copper cost County Creek cross-cut crushing deposits depth distance district ditch drift Dutch Flat east erected expenses extracted feet feet deep feet long feet wide flasks furnace galena gangue Gilpin County gold Gold Hill grade granite Grass Valley gravel ground Gulch Hill hoisting inches Inyo County iron labor lead ledge length located lode metal miles mill miners Mining Company months Mountain nearly Nevada operation ounces owners oxide Plumas County porphyry portion pounds present production profit prospecting protochloride pump pyrites quantity quartz quartz-mining quartzite quicksilver reverberatory furnace rich River roasting rock shipped silver silver-ores slate smelting Spanish Peak specific gravity stamps stoping stream sulphate sulphur sulphurets sunk superintendent supply surface syenite tellurium tion tons Total tunnel Valley vein width winze yield