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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Stran 40
... occurring with the copper in the Lake Superior region has not been sufficient to render it worth while to erect the ... occur- ring only occasionally , and then often in masses of considerable size , there can be no doubt that a very ...
... occurring with the copper in the Lake Superior region has not been sufficient to render it worth while to erect the ... occur- ring only occasionally , and then often in masses of considerable size , there can be no doubt that a very ...
Stran 97
... occur- rence being similar to that in California.2 The Bohemia mining district of western Oregon was discovered in August , 1858 , by Dr. W. W. Oglesby and Frank Brass . The region was named after James Johnson , called Bohemia Johnson ...
... occur- rence being similar to that in California.2 The Bohemia mining district of western Oregon was discovered in August , 1858 , by Dr. W. W. Oglesby and Frank Brass . The region was named after James Johnson , called Bohemia Johnson ...
Stran 113
... occurs in Wisconsin , and according to R. D. Irving traces of silver have been found along the Montreal River . When ... occur in the crystalline rocks of northern Wisconsin , yet in one instance only was it and silver found in quartz ...
... occurs in Wisconsin , and according to R. D. Irving traces of silver have been found along the Montreal River . When ... occur in the crystalline rocks of northern Wisconsin , yet in one instance only was it and silver found in quartz ...
Stran 165
... occur has been given : " Gold , silver , copper , lead , etc. , are found in all rocks . Silver ores occur in all kinds of rocks , as granites , porphyry , trap , limestone , sandstone and shales . The famous mine of Guanajuato , the ...
... occur has been given : " Gold , silver , copper , lead , etc. , are found in all rocks . Silver ores occur in all kinds of rocks , as granites , porphyry , trap , limestone , sandstone and shales . The famous mine of Guanajuato , the ...
Stran 166
... occur in crystalline limestone . Other Russian mines , those of Altai , for instance , occur in a coarse clay - slate in the vicinity of porphyry , and contain besides silver ores , those of gold , copper and lead . " " Gold may occur ...
... occur in crystalline limestone . Other Russian mines , those of Altai , for instance , occur in a coarse clay - slate in the vicinity of porphyry , and contain besides silver ores , those of gold , copper and lead . " " Gold may occur ...
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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