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 7
... iron ore from the Gellivare mines , Sweden , to the seaport at Lulea . This road bears the distinction of being the first railway to penetrate the Frigid Zone , lying as it does above the Arctic Circle . However , the finding of the sea ...
... iron ore from the Gellivare mines , Sweden , to the seaport at Lulea . This road bears the distinction of being the first railway to penetrate the Frigid Zone , lying as it does above the Arctic Circle . However , the finding of the sea ...
Stran 8
... iron ores smelted . Thus the stimulus given to the iron trade in England in 1830-40 , by the construction of 3000 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 ...
... iron ores smelted . Thus the stimulus given to the iron trade in England in 1830-40 , by the construction of 3000 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 ...
Stran 9
... iron works are now also in ill - suited conditions ; but they were originally started near small iron deposits which are now exhausted . " But it is not only in the iron trade that low rates of carriage have helped the metallurgist ...
... iron works are now also in ill - suited conditions ; but they were originally started near small iron deposits which are now exhausted . " But it is not only in the iron trade that low rates of carriage have helped the metallurgist ...
Stran 12
... iron ore mines of the Lake Superior region , since the soft ore miners are having their innings with the furnace men , Blake crushers of enor- mous size have been installed , in order to reduce the hard iron ore to small pieces so that ...
... iron ore mines of the Lake Superior region , since the soft ore miners are having their innings with the furnace men , Blake crushers of enor- mous size have been installed , in order to reduce the hard iron ore to small pieces so that ...
Stran 17
... iron industry of stupendous proportions in the Lake Superior region ; lead and zinc in the Mississippi Valley ; while coal is found in large quantities in almost every section of the country . " The greater development of our mining ...
... iron industry of stupendous proportions in the Lake Superior region ; lead and zinc in the Mississippi Valley ; while coal is found in large quantities in almost every section of the country . " The greater development of our mining ...
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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