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 81
Stran 37
... associated in the Lake Superior region . During 1846 Mr. Forrest Sheppard conducted an extensive search for silver with a party under the auspices of the Montreal Mining Company . The shore of the lake was carefully examined from Sault ...
... associated in the Lake Superior region . During 1846 Mr. Forrest Sheppard conducted an extensive search for silver with a party under the auspices of the Montreal Mining Company . The shore of the lake was carefully examined from Sault ...
Stran 59
... associated minerals , the separation of the gold could not be made to pay , at least at wages that the miners would be satisfied with . In July , 1878 , attention was again called to the ocean beaches owing to discoveries made by John ...
... associated minerals , the separation of the gold could not be made to pay , at least at wages that the miners would be satisfied with . In July , 1878 , attention was again called to the ocean beaches owing to discoveries made by John ...
Stran 79
... associated with native copper , was discovered in the summer of 1845. Considerable silver has been obtained from this mine during its operations.3 The gold veins northwest of Ishpeming were first examined by Mr. Julius Ropes , who had ...
... associated with native copper , was discovered in the summer of 1845. Considerable silver has been obtained from this mine during its operations.3 The gold veins northwest of Ishpeming were first examined by Mr. Julius Ropes , who had ...
Stran 113
... associated with pyrite and arsenopyrite , in northern Clark County.2 Gold has been found in ledges of diabase in Douglas County . The Chippawa mine further up the range gives a yield of from $ 2 to $ 11 per ton in gold . The discovery ...
... associated with pyrite and arsenopyrite , in northern Clark County.2 Gold has been found in ledges of diabase in Douglas County . The Chippawa mine further up the range gives a yield of from $ 2 to $ 11 per ton in gold . The discovery ...
Stran 153
... associated with veins , and which are vast and local- ized stores of heat and energy . " However , we must exclude from this class those ore - bodies usually basic and often composed of igneous segregations . " But for veins and kindred ...
... associated with veins , and which are vast and local- ized stores of heat and energy . " However , we must exclude from this class those ore - bodies usually basic and often composed of igneous segregations . " But for veins and kindred ...
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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