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 92
Stran 12
... continued friction of so much fresh , energetic thought , in no great time brought about almost a revolution in all mining work , as well as in its imple- ments and accessories . " The steam hammer suggested the steam stamp to Wilson ...
... continued friction of so much fresh , energetic thought , in no great time brought about almost a revolution in all mining work , as well as in its imple- ments and accessories . " The steam hammer suggested the steam stamp to Wilson ...
Stran 38
... continued to be pro- ductive after the body of the second bonanza had been extracted , yet it was ultimately abandoned without the discovery of other phenominally rich portions . The discovery of silver - bearing veins was made by Mr ...
... continued to be pro- ductive after the body of the second bonanza had been extracted , yet it was ultimately abandoned without the discovery of other phenominally rich portions . The discovery of silver - bearing veins was made by Mr ...
Stran 45
... continued in 1885 and considerable work was done on the Stewart River . A few especially rich finds kept the excitement up , thus materially increasing the number of miners on the Upper Yukon . 1 History and Conditions of the Yukon Gold ...
... continued in 1885 and considerable work was done on the Stewart River . A few especially rich finds kept the excitement up , thus materially increasing the number of miners on the Upper Yukon . 1 History and Conditions of the Yukon Gold ...
Stran 75
... continued to lead in the production of gold . Extensive placer operations materially added to the yield from Elmore County . The placer working still continued to swell the gold production in 1900 , most of which came from dredging on ...
... continued to lead in the production of gold . Extensive placer operations materially added to the yield from Elmore County . The placer working still continued to swell the gold production in 1900 , most of which came from dredging on ...
Stran 83
... continued to pay large dividends . The Helena and Victor mines of Missoula County were reasonably pro- 1 U. S. G. S. , 22 Rept . , pt . 2 , p . 411 , 1901 . * Eng . and Min . Jour . , Vol . 60 , p . 583 . Economic Bull . , 213 ...
... continued to pay large dividends . The Helena and Victor mines of Missoula County were reasonably pro- 1 U. S. G. S. , 22 Rept . , pt . 2 , p . 411 , 1901 . * Eng . and Min . Jour . , Vol . 60 , p . 583 . Economic Bull . , 213 ...
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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