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 90
Stran vii
... Shafts . Drainage . Ventilation ― Nevada : the Comstock mines ; 446 - Kinds of Tim- - - Timber- 448 CHAPTER VI . EXTRACTION OF VALUES . HISTORICAL SKETCH . METHODS OF EXTRACTION cesses . 470 496 Amalgamation . - Plate and Barrel Pro ...
... Shafts . Drainage . Ventilation ― Nevada : the Comstock mines ; 446 - Kinds of Tim- - - Timber- 448 CHAPTER VI . EXTRACTION OF VALUES . HISTORICAL SKETCH . METHODS OF EXTRACTION cesses . 470 496 Amalgamation . - Plate and Barrel Pro ...
Stran ix
... Shaft , Leadville , Colorado 172 210 Ruby Mountain , Gray's Peak , Argentine Pass , Montezuma , Colorado , facing 218 Dahlonega and Vicinity , Georgia 225 Central Idaho Gold Fields 227 The Coeur d'Alêne Mining Region , Idaho 228 The ...
... Shaft , Leadville , Colorado 172 210 Ruby Mountain , Gray's Peak , Argentine Pass , Montezuma , Colorado , facing 218 Dahlonega and Vicinity , Georgia 225 Central Idaho Gold Fields 227 The Coeur d'Alêne Mining Region , Idaho 228 The ...
Stran 20
... shafts sunk in hard rock , walls and ditches made for the control of loose materials and water , and buildings erected evidently for the treatment of mineral and the possible reduction of ore , practically no word comes to us from the ...
... shafts sunk in hard rock , walls and ditches made for the control of loose materials and water , and buildings erected evidently for the treatment of mineral and the possible reduction of ore , practically no word comes to us from the ...
Stran 22
... shafts have been found , varying in depth from ninety to one hundred feet . Six miles southeast of this locality are five other shafts similar in age and construction . The presence of iron and the marks of sharp metallic tools prove ...
... shafts have been found , varying in depth from ninety to one hundred feet . Six miles southeast of this locality are five other shafts similar in age and construction . The presence of iron and the marks of sharp metallic tools prove ...
Stran 37
... shafts were sunk to depths ranging from 14 to 60 feet , no ore in sufficient quantities for working was discovered , and operations ceased in 1857 . Both the Prince and Mamainse mines were preeminently copper mines , the silver being an ...
... shafts were sunk to depths ranging from 14 to 60 feet , no ore in sufficient quantities for working was discovered , and operations ceased in 1857 . Both the Prince and Mamainse mines were preeminently copper mines , the silver being an ...
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Alaska amalgamation andesite argentiferous assay auriferous average bed-rock blende calcite California Carolina cent chalcopyrite chlorination Colorado Comstock lode 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 gold and silver gold production gold-bearing granite gravel gray copper Gulch Hill hydraulic Ibid Idaho igneous rocks inches iron Jour lead limestone located mercury method Mexico mill Mineral Industry Mineral Resources Mines and Minerals Montana Mountain Nevada North North Carolina occur operations ore-bodies ounces output oxide placer mines placers porphyry precious metals Press probably production of gold pyrite quantities quartz quartz-veins Rept River roasting rocks schists shaft silver production Silver-bearing slate sluices smelting solution South stamps stope sulphides sulphurets surface TABLE tellurides tellurium tetrahedrite timber tion tons Total tunnel usually Utah veins width yield zinc