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 ix
... River Gold Fields , Idaho 315 Arrangement of Sluices in Hydraulic Mining facing 370 A Yuba River Dam and Flume , Grass Valley , California Arrangement of Sluices on a Gold Dredger 383 facing 400 Stope in Silver Wave Mining District ...
... River Gold Fields , Idaho 315 Arrangement of Sluices in Hydraulic Mining facing 370 A Yuba River Dam and Flume , Grass Valley , California Arrangement of Sluices on a Gold Dredger 383 facing 400 Stope in Silver Wave Mining District ...
Stran 22
... River Valley , eleven old 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 ...
... River Valley , eleven old 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 ...
Stran 32
... River in the extreme southeastern angle of the state . Fifty years later , deposits of free gold were found at San Isidro , one hundred miles further west , in San Diego County . In 1833 , a little gold was gathered in the valley of the ...
... River in the extreme southeastern angle of the state . Fifty years later , deposits of free gold were found at San Isidro , one hundred miles further west , in San Diego County . In 1833 , a little gold was gathered in the valley of the ...
Stran 34
... River some hundreds of miles . As their trade grew they pushed along the coast east- ward from both the Pacific and Bering Sea . In the meantime the English were rapidly carrying their trade westward from posts on the Mackenzie River ...
... River some hundreds of miles . As their trade grew they pushed along the coast east- ward from both the Pacific and Bering Sea . In the meantime the English were rapidly carrying their trade westward from posts on the Mackenzie River ...
Stran 35
... River . Frances Lake was discovered by Campbell in 1840 while exploring the Colville River . Subsequently he discov- ered the Pelly , which he named after the governor of the company . In 1842 , Pelly Banks Post was established at the ...
... River . Frances Lake was discovered by Campbell in 1840 while exploring the Colville River . Subsequently he discov- ered the Pelly , which he named after the governor of the company . In 1842 , Pelly Banks Post was established at 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