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 47
Stran 44
... or bank will , when washed , give several colors . " 1 U. S. G. S. , 18 Annual Rept . , pt . 3 , p . 111 . 2 Along Alaska's Great River , p . 190 . Bench gravels containing gold were found at Von Wilczeks Valley 44 GOLD AND SILVER .
... or bank will , when washed , give several colors . " 1 U. S. G. S. , 18 Annual Rept . , pt . 3 , p . 111 . 2 Along Alaska's Great River , p . 190 . Bench gravels containing gold were found at Von Wilczeks Valley 44 GOLD AND SILVER .
Stran 71
... washed for many years previous . At this time a combination method consisting of hydraulicing , sluicing and mill- ing was inaugurated in a number of the mines , being known as the Georgia or Dahlonega method . Mechanical dredges were ...
... washed for many years previous . At this time a combination method consisting of hydraulicing , sluicing and mill- ing was inaugurated in a number of the mines , being known as the Georgia or Dahlonega method . Mechanical dredges were ...
Stran 83
... washed . Owing to the promi- nence of the quartz ledges they were soon examined and found to contain silver . No great success rewarded these early efforts until the discovery of rich silver ore was made in the Travona in 1876. * The ...
... washed . Owing to the promi- nence of the quartz ledges they were soon examined and found to contain silver . No great success rewarded these early efforts until the discovery of rich silver ore was made in the Travona in 1876. * The ...
Stran 85
... washed under the supervision of Mayor Norris of Crete , yielded $ 12 , approximately thirty cents per cubic yard . The centers of excitement were chiefly Seward , Stanton , and Franklin counties , but it extended also as far as Harlan ...
... washed under the supervision of Mayor Norris of Crete , yielded $ 12 , approximately thirty cents per cubic yard . The centers of excitement were chiefly Seward , Stanton , and Franklin counties , but it extended also as far as Harlan ...
Stran 86
... washed some of the gravel and found values worth a few cents in a few minutes ' work . He then named the place Gold Cañon , which name it still retains . This is claimed to be the first discovery of gold in Nevada . It is further ...
... washed some of the gravel and found values worth a few cents in a few minutes ' work . He then named the place Gold Cañon , which name it still retains . This is claimed to be the first discovery of gold in Nevada . It is further ...
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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