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 15
... average intelligence and aptness of the American miner has been such that he has gained a vast amount of practical information in this way . But , from time to time during the past several decades , the young min- ing engineers who have ...
... average intelligence and aptness of the American miner has been such that he has gained a vast amount of practical information in this way . But , from time to time during the past several decades , the young min- ing engineers who have ...
Stran 57
... average for all concerned is twenty dollars per diem . " 1 Captain Sutter , for whom Marshall was working and near whose place the discovery of gold was made , took samples of the gold to Monterey to the military authorities , General ...
... average for all concerned is twenty dollars per diem . " 1 Captain Sutter , for whom Marshall was working and near whose place the discovery of gold was made , took samples of the gold to Monterey to the military authorities , General ...
Stran 77
... average value was $ 2 to $ 3 in gold and silver per ton , and one series of assays gave an average of $ 10 per ton . Dr. Ernest Fahrig of Philadelphia ( Kansas Daily Capital , Topeka , May 3 , 1902 ) obtained from actual mill runs in an ...
... average value was $ 2 to $ 3 in gold and silver per ton , and one series of assays gave an average of $ 10 per ton . Dr. Ernest Fahrig of Philadelphia ( Kansas Daily Capital , Topeka , May 3 , 1902 ) obtained from actual mill runs in an ...
Stran 162
... averages of a large number of cases bring out the difference . In this connection the following table is interesting ... average fineness of the total product of the Ruby gravel mine , California , was 898 ; 3 per cent of the product ...
... averages of a large number of cases bring out the difference . In this connection the following table is interesting ... average fineness of the total product of the Ruby gravel mine , California , was 898 ; 3 per cent of the product ...
Stran 173
... averages $ 25 to $ 30 per ton , and is free - milling . It occurs in a decomposed vein - filling of sandstone and ... average thickness is from eight to nine inches . The quartz is highly vitreous and of bluish color . It is said that ...
... averages $ 25 to $ 30 per ton , and is free - milling . It occurs in a decomposed vein - filling of sandstone and ... average thickness is from eight to nine inches . The quartz is highly vitreous and of bluish color . It is said that ...
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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