Statistics of Mines and Mining in the States and Territories West of the Rocky Mountains: Being the [1st-8th] Annual Report of Rossiter W. Raymond, U.S. Commissioner of Mining StatisticsU.S. Government Printing Office, 1873 |
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Seite 17
... depth of about 40 feet , from which were taken about 100 tons of ore . Three tons , of an average grade , were hauled to Aurora , about thirty miles , which paid by mill - process over $ 50 to the ton , being about three - quarters gold ...
... depth of about 40 feet , from which were taken about 100 tons of ore . Three tons , of an average grade , were hauled to Aurora , about thirty miles , which paid by mill - process over $ 50 to the ton , being about three - quarters gold ...
Seite 18
... depth required for lead and slag basins out- side of the furnaces . The difficulty was overcome by inserting iron ... depth of about 175 feet from the surface , the ore - body begins to stand nearly perpendicularly , and continues so for ...
... depth required for lead and slag basins out- side of the furnaces . The difficulty was overcome by inserting iron ... depth of about 175 feet from the surface , the ore - body begins to stand nearly perpendicularly , and continues so for ...
Seite 25
... depth to which their shaft has been sunk . This claim com- prises 1,200 feet . The Golden Chariot , discovered in February , 1871 , has proved the most productive mine in the district . At 50 feet in depth water was en- countered on the ...
... depth to which their shaft has been sunk . This claim com- prises 1,200 feet . The Golden Chariot , discovered in February , 1871 , has proved the most productive mine in the district . At 50 feet in depth water was en- countered on the ...
Seite 26
... depth of 200 feet , and runs east 140 feet , aud west 180 feet . The ledge in this level averages 3 feet in width , and has paid at the mill about $ 35 per ton . The third level , at a depth of 275 feet , runs east 260 feet , and west ...
... depth of 200 feet , and runs east 140 feet , aud west 180 feet . The ledge in this level averages 3 feet in width , and has paid at the mill about $ 35 per ton . The third level , at a depth of 275 feet , runs east 260 feet , and west ...
Seite 27
... depth . The mill is now run by a 40 - horse engine , to which is also attached a small set of hoisting - works . The vein has been in some places 20 feet in width , and yields on an average from $ 12 to $ 20 per ton throughout . The ...
... depth . The mill is now run by a 40 - horse engine , to which is also attached a small set of hoisting - works . The vein has been in some places 20 feet in width , and yields on an average from $ 12 to $ 20 per ton throughout . The ...
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50 feet amalgam amount assay average base bullion bed-rock bottom buddle bullion California Cañon carbonate carried cent channel claim Clear Creek County coal company's contains copper cost County Creek crushing deposit depth developed diameter district ditch drift east Eureka expenses feet deep feet long feet wide flume furnace galena Gilpin County grade granite gravel ground Gulch Hill hoisting-works hydraulic hydraulic mining inches incline iron lead ledge length limestone located lode miles mill miners Mining Company Mount Gregory Mountain nearly Nevada opened operations ore-body ounces particles pipe Pliocene portion pounds present prospecting quantity quartz quicksilver railroad rich River rock San Francisco sand shaft Sierra Sierra County Sierra Nevada slag sluice-boxes sluices smelting smelting-works specific gravity square miles stamps stopes stream sulphurets sunk surface tailings tion tons Total tunnel tuyeres Valley vein washed width yield