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 100
Stran 15
... mining development in the study of the character and composition of the various ores and minerals , thus making known more gen- erally and by more accurate methods the extent and richness of the ore deposits . The chemist has ...
... mining development in the study of the character and composition of the various ores and minerals , thus making known more gen- erally and by more accurate methods the extent and richness of the ore deposits . The chemist has ...
Stran 48
... ore - body upon which the Mexican mine is located . A silver - lead mine , the Omalak , which in 1894 was claimed to be the northernmost mine of Alaska , was discovered in 1881. It is located on Fish River near Golofnin Bay , about ...
... ore - body upon which the Mexican mine is located . A silver - lead mine , the Omalak , which in 1894 was claimed to be the northernmost mine of Alaska , was discovered in 1881. It is located on Fish River near Golofnin Bay , about ...
Stran 66
... ore mined here . During 1878 , George Fryer prospecting by shaft in Stray Horse Gulch found carbonate ore . The ore - body here found proved to be very rich and remarkable in many ways . Previous to this , how- ever , veins near Rosita ...
... ore mined here . During 1878 , George Fryer prospecting by shaft in Stray Horse Gulch found carbonate ore . The ore - body here found proved to be very rich and remarkable in many ways . Previous to this , how- ever , veins near Rosita ...
Stran 69
... ore - bodies , especially on Beacon Hill . Discoveries in the Reindeer and Conorado mines have infused new life in the Leadville district . Stimulated by more favorable smelter 1 Eng . and Min . Jour . , Vol . 68 , p . 67 . rates , the ...
... ore - bodies , especially on Beacon Hill . Discoveries in the Reindeer and Conorado mines have infused new life in the Leadville district . Stimulated by more favorable smelter 1 Eng . and Min . Jour . , Vol . 68 , p . 67 . rates , the ...
Stran 84
... Mining and Extraction of Values, and a Detailed D Walter Richard Crane. ductive . The Boulder region , some 60 miles south ... ore - bodies discovered in the old Drumlummon mine have revived operations there . The Bald Butte mine of the ...
... Mining and Extraction of Values, and a Detailed D Walter Richard Crane. ductive . The Boulder region , some 60 miles south ... ore - bodies discovered in the old Drumlummon mine have revived operations there . The Bald Butte mine of the ...
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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