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 76
... depth of 100 to 150 feet and covers practically the entire area . Gold was reported in 1873 at Mooresville , on a small creek . The sands and gravels were claimed to have yielded from 25 to 200 colors to a pan . Seventy dollars were ...
... depth of 100 to 150 feet and covers practically the entire area . Gold was reported in 1873 at Mooresville , on a small creek . The sands and gravels were claimed to have yielded from 25 to 200 colors to a pan . Seventy dollars were ...
Stran 82
... depth of 40 to 50 feet in 1869.3 In 1863 , the placers of Horse Prairie Creek were discovered , and two years later those at Helena were located . The placers of Bear Gulch were discovered in October , 1865 , by prospectors under Jack ...
... depth of 40 to 50 feet in 1869.3 In 1863 , the placers of Horse Prairie Creek were discovered , and two years later those at Helena were located . The placers of Bear Gulch were discovered in October , 1865 , by prospectors under Jack ...
Stran 90
... depth of 48 feet between 1857-63 . The first claims were very rich but were soon exhausted and were shortly abandoned . The district lay idle until about 1868-69 , when work was resumed on Mineral Hill.1 The Eureka mine was first ...
... depth of 48 feet between 1857-63 . The first claims were very rich but were soon exhausted and were shortly abandoned . The district lay idle until about 1868-69 , when work was resumed on Mineral Hill.1 The Eureka mine was first ...
Stran 100
... depth is variable . In the valley of the Anon there are some cuts , from six to eight meters ( 20 to 26 feet ) deep , made in such alluvial deposits with the view of exploiting the auriferous strata . " It is known that the watershed of ...
... depth is variable . In the valley of the Anon there are some cuts , from six to eight meters ( 20 to 26 feet ) deep , made in such alluvial deposits with the view of exploiting the auriferous strata . " It is known that the watershed of ...
Stran 131
... depth during 1869 . The Rudefeha or Haggerty - Ferris mine , near Battle Lake , Wyom- ing , was discovered in the Grand Encampment district . 1870 . The silver mines of Eureka and Pioche , Nevada , became large producers . The first ...
... depth during 1869 . The Rudefeha or Haggerty - Ferris mine , near Battle Lake , Wyom- ing , was discovered in the Grand Encampment district . 1870 . The silver mines of Eureka and Pioche , Nevada , became large producers . The first ...
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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