Gold and Silver: Comprising an Economic History of Mining in the United States, the Geographical and Geological Occurrence of the Precious Metals, with Their Mineralogical Associations, History and Description of Methods of Mining and Extraction of Values, and a Detailed Discussion of the Production of Gold and Silver in the World and the United StatesJ. Wiley & Sons, 1908 - 727 strani |
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Zadetki 1–5 od 85
Stran 78
... schist occurs at Baileyville on the Maine side of the St. Croix River.3 Professor C. H. Hitchcock thinks that the Ammonoosuc gold field of New Hampshire and Vermont probably extends into Maine . * Maryland . Although gold was known to ...
... schist occurs at Baileyville on the Maine side of the St. Croix River.3 Professor C. H. Hitchcock thinks that the Ammonoosuc gold field of New Hampshire and Vermont probably extends into Maine . * Maryland . Although gold was known to ...
Stran 80
... schists extend- ing from Thomson and Carlton to and beyond Little Falls , contains many quartz - veins , and much work has been done with little or no returns.2 In comparatively recent years interest has been centered almost entirely in ...
... schists extend- ing from Thomson and Carlton to and beyond Little Falls , contains many quartz - veins , and much work has been done with little or no returns.2 In comparatively recent years interest has been centered almost entirely in ...
Stran 93
... schists occurring along the Connecticut River , and lying mostly in New Hampshire . - ' Mineral Industry for 1892 to 1904 . 2 American Jour . of Min . , Vol . 2 , p . 386 . ' Whitney's Metallic Wealth of the United States , 1854 , p ...
... schists occurring along the Connecticut River , and lying mostly in New Hampshire . - ' Mineral Industry for 1892 to 1904 . 2 American Jour . of Min . , Vol . 2 , p . 386 . ' Whitney's Metallic Wealth of the United States , 1854 , p ...
Stran 164
... schist , very siliceous , being blue , green and gray in color , the auriferous portion usually being colored . The zones are quite irregular and were probably influenced by the power of penetration of the mineralized currents , which ...
... schist , very siliceous , being blue , green and gray in color , the auriferous portion usually being colored . The zones are quite irregular and were probably influenced by the power of penetration of the mineralized currents , which ...
Stran 165
... schists , often with little quartz . At the Blue Gouge Mine , El Dorado County , California , there is a zone of slaty rock upwards of 600 feet in width , which is occasionally cut by small quartz - veins . The whole zone is low - grade ...
... schists , often with little quartz . At the Blue Gouge Mine , El Dorado County , California , there is a zone of slaty rock upwards of 600 feet in width , which is occasionally cut by small quartz - veins . The whole zone is low - grade ...
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Alaska amalgamation andesite argentiferous assay auriferous average bed-rock blende bornite calcite California Carolina cent chalcopyrite chloride chlorination Colorado Comstock lode concentration considerable copper country-rock County Cripple Creek cyanide cyanide process Deep Mines deposits depth diorite discovered discovery district dollars drift employed extraction feet free-gold furnace galena gangue gneiss gold and silver gold production Gold-bearing granite gravel gray copper Gulch Hill hydraulic Ibid Idaho inches iron Jour lead limestone located mercury method Mexico mill Mineral Industry Mineral Resources Mines and Minerals Montana Mountain Nevada North occur operations ore-bodies ounces output oxide placer mines placers porphyry precious metals Press probably production of gold pyrite pyrrhotite quantities quartz quartz-veins quartzites Rept rhyolite River rocks schists shaft siliceous silver production Silver-bearing slate sluices smelting solution South stamps stope sulphides sulphurets surface TABLE tellurides tellurium tetrahedrite timber tion tons Total tunnel Utah yield zinc