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 3
... miles away ; the rafters lashed with raw - hide instead of being nailed ; the old red tiles made by the Mission Indians and held in place by their own weight — all speak of the difficulties of building in those days . Yet the whole is ...
... miles away ; the rafters lashed with raw - hide instead of being nailed ; the old red tiles made by the Mission Indians and held in place by their own weight — all speak of the difficulties of building in those days . Yet the whole is ...
Stran 8
... miles of railroad , raised the production of pig iron from 677,417 tons to 1,396,400 tons in 1840. She mined about 50,000 tons of coal , made 11,500 tons of copper , about 58,000 tons of lead , and 4400 tons of tin . Since then her ...
... miles of railroad , raised the production of pig iron from 677,417 tons to 1,396,400 tons in 1840. She mined about 50,000 tons of coal , made 11,500 tons of copper , about 58,000 tons of lead , and 4400 tons of tin . Since then her ...
Stran 9
... miles ) at 14 cents per ton ) ; or to Great Falls ( 170 miles ) where advan- tage is taken of water power . Another instance is the shipment of copper - matte from Tennessee to the heart of Mexico , where it has been used to collect ...
... miles ) at 14 cents per ton ) ; or to Great Falls ( 170 miles ) where advan- tage is taken of water power . Another instance is the shipment of copper - matte from Tennessee to the heart of Mexico , where it has been used to collect ...
Stran 15
... miles for the purpose of operating mining machinery ; and now the electrical furnace and other electro - metallurgical processes are doing much toward making possible the reduction of many ores and the refining of many metals ...
... miles for the purpose of operating mining machinery ; and now the electrical furnace and other electro - metallurgical processes are doing much toward making possible the reduction of many ores and the refining of many metals ...
Stran 22
... 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 that these ancient mining operations cannot be referred to the labors of the ...
... 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 that these ancient mining operations cannot be referred to the labors of the ...
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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