Mineral Resources of the States and Territories West of the Rocky Mountains ..., Том 6U.S. Government Printing Office, 1874 |
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... deposits , and the progress of their development . The other parts of my annual report have been devoted to the pre- sentation of such valuable information as my own professional knowl- edge and labors , together with the co - operation ...
... deposits , and the progress of their development . The other parts of my annual report have been devoted to the pre- sentation of such valuable information as my own professional knowl- edge and labors , together with the co - operation ...
Страница 6
... deposits calcu lated to expose and refute numerous popular errors upon the subject which have seriously interfered with rational mining . In the same . volume was given an extensive treatise on the mechanical appliances of mining which ...
... deposits calcu lated to expose and refute numerous popular errors upon the subject which have seriously interfered with rational mining . In the same . volume was given an extensive treatise on the mechanical appliances of mining which ...
Страница 7
... deposits , constituted an appropriate introduction . This report contained also a chapter on the dressing of ores , a subject which every year brings into greater prominence in this country , as the amount of tailings and low - grade ...
... deposits , constituted an appropriate introduction . This report contained also a chapter on the dressing of ores , a subject which every year brings into greater prominence in this country , as the amount of tailings and low - grade ...
Страница 9
... deposits of smelting - ore in Eureka County . Detailed infor- mation concerning these and all other districts can be found in the respective chapters of the report . Credit is given , throughout this report , to the numerous gentlemen ...
... deposits of smelting - ore in Eureka County . Detailed infor- mation concerning these and all other districts can be found in the respective chapters of the report . Credit is given , throughout this report , to the numerous gentlemen ...
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... deposits are receiving , manifested by the investment of large sums in mining enterprises of this class , and in view of the fact that each report falls into the hands of many new readers , I have deemed it advisable to publish such ...
... deposits are receiving , manifested by the investment of large sums in mining enterprises of this class , and in view of the fact that each report falls into the hands of many new readers , I have deemed it advisable to publish such ...
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30 feet Amador County amount antimony assay average base bullion bed-rock bottom California Cañon carried cent centner charge chloride cinnabar claim Clear Creek County coal company's containing copper cost County Creek cross-cut crushed cupellation Deer Lodge deposits depth developed district ditch drift east estimated Eureka expenses extracted feet deep feet long feet wide flasks flume furnace galena gold gravel ground Gulch Hill hydraulic Idria inches iron labor Lautenthal lead-matte ledge limestone litharge located lode matte metal miles mill miners Mining Company Mountain Nevada Nevada County obtained opened operations ore-body ounces oxides porphyry pounds profit prospecting quantity quartz quicksilver refining reverberatory reverberatory furnace rich River roasting rock San Francisco shaft shipped silver slag slate smelting smelting-works stamps steam sulphurets sunk supply surface tailings thick tons Total tunnel tuyeres Valley vein washing width yield zinc