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 65
Stran 37
... dollars , for a return of only $ 20,000 , the operations were suspended in 1882. Another vein , producing ore which compared ' Trans . Lake Superior Inst . Min . Engrs . , Vol . 2 , p . 64 , 1894 . favorably with that of the Silver ...
... dollars , for a return of only $ 20,000 , the operations were suspended in 1882. Another vein , producing ore which compared ' Trans . Lake Superior Inst . Min . Engrs . , Vol . 2 , p . 64 , 1894 . favorably with that of the Silver ...
Stran 38
... dollars . From 1874 to 1876 the mine was nearly forced to stop operations owing to the running out of the ore and failure , after the most strenuous efforts , to discover any new bodies However , in the summer of 1878 , its fortune ...
... dollars . From 1874 to 1876 the mine was nearly forced to stop operations owing to the running out of the ore and failure , after the most strenuous efforts , to discover any new bodies However , in the summer of 1878 , its fortune ...
Stran 57
... dollars worth of the real stuff in one day's washing ; and the average for all concerned is twenty dollars per diem . " 1 Captain Sutter , for whom Marshall was working and near whose place the discovery of gold was made , took samples ...
... dollars worth of the real stuff in one day's washing ; and the average for all concerned is twenty dollars per diem . " 1 Captain Sutter , for whom Marshall was working and near whose place the discovery of gold was made , took samples ...
Stran 76
... dollars were reported collected at Gold Branch of Pine Creek in 1873.1 Silver mines were mentioned in the mining journals about 1888 , as being worked in Dubois County , and the run of a local smelter on 1500 pounds of ore is given at ...
... dollars were reported collected at Gold Branch of Pine Creek in 1873.1 Silver mines were mentioned in the mining journals about 1888 , as being worked in Dubois County , and the run of a local smelter on 1500 pounds of ore is given at ...
Stran 80
... dollars in gold alone since 1883 , when $ 1,286.74 was realized by the Ropes mine . Minnesota . In 1866 , H. H. Eames reported the discovery of gold and silver , which caused much speculation regarding the value of the deposits found ...
... dollars in gold alone since 1883 , when $ 1,286.74 was realized by the Ropes mine . Minnesota . In 1866 , H. H. Eames reported the discovery of gold and silver , which caused much speculation regarding the value of the deposits found ...
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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