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 8
... 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 railroad mileage has increased to 22,700 , her production of pig iron ...
... 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 railroad mileage has increased to 22,700 , her production of pig iron ...
Stran 9
... tons came from the Lake Superior district . 66 Among the strange contradictions is the persistency with which the ... ton per mile . " The interdependence of mines and railroads is also shown in the mines of Butte which largely send ...
... tons came from the Lake Superior district . 66 Among the strange contradictions is the persistency with which the ... ton per mile . " The interdependence of mines and railroads is also shown in the mines of Butte which largely send ...
Stran 10
... tons of coal to move a train from Bakers- field to San Francisco , which at $ 4.375 per ion plus $ 25 for labor amounted to $ 150 . With oil at 20 cents a barrel , and three barrels equal to a ton of coal , the cost per ton rate is 60 ...
... tons of coal to move a train from Bakers- field to San Francisco , which at $ 4.375 per ion plus $ 25 for labor amounted to $ 150 . With oil at 20 cents a barrel , and three barrels equal to a ton of coal , the cost per ton rate is 60 ...
Stran 12
... tons per day they are now capable of crushing several hundred tons per day in regular work in that length of time . " The machine drill was another offspring of the steam hammer . Its great assistance to the miner has quite ...
... tons per day they are now capable of crushing several hundred tons per day in regular work in that length of time . " The machine drill was another offspring of the steam hammer . Its great assistance to the miner has quite ...
Stran 17
... tons of lead , 90,000 short tons of zinc , quicksilver to the amount of 36,000 flasks , more than 500,000 to 1,000,000 pounds of aluminum , 53,000,000 barrels of petroleum , 8,000,000 to 9,000,000 barrels of cement , 11,500,000 to ...
... tons of lead , 90,000 short tons of zinc , quicksilver to the amount of 36,000 flasks , more than 500,000 to 1,000,000 pounds of aluminum , 53,000,000 barrels of petroleum , 8,000,000 to 9,000,000 barrels of cement , 11,500,000 to ...
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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