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
... Portion of Isthmus of Panama 234 Death Valley and Adjacent Mining Districts , California . 247 Tonopah , Nevada facing 252 The Organ Mountains , New Mexico facing 254 Gold Mining Region of Eastern Oregon 258 Map of Porto Rico . . 261 ...
... Portion of Isthmus of Panama 234 Death Valley and Adjacent Mining Districts , California . 247 Tonopah , Nevada facing 252 The Organ Mountains , New Mexico facing 254 Gold Mining Region of Eastern Oregon 258 Map of Porto Rico . . 261 ...
Stran 6
... portion of it was uncultivated bottom land which afforded a some- what precarious pasturage at some seasons of the year , and a further large portion was the partially overgrown piles of tailings left by the hand workers of the days ...
... portion of it was uncultivated bottom land which afforded a some- what precarious pasturage at some seasons of the year , and a further large portion was the partially overgrown piles of tailings left by the hand workers of the days ...
Stran 11
... portion of the population which comes and goes with the prosperity of a camp carries with it when it goes the miners ' money , while the miners who earned and spent it are with- out any.1 In the early days of mining in the Western ...
... portion of the population which comes and goes with the prosperity of a camp carries with it when it goes the miners ' money , while the miners who earned and spent it are with- out any.1 In the early days of mining in the Western ...
Stran 15
... portions of the earth's crust ; and , in the regions where these mineral deposits do occur , they can , with the aid of a limited amount of exploitation , go far toward determining the extent and nature and value of many of these ...
... portions of the earth's crust ; and , in the regions where these mineral deposits do occur , they can , with the aid of a limited amount of exploitation , go far toward determining the extent and nature and value of many of these ...
Stran 19
... portion of our land . Our territory epitomizes the processes of all time and their useful results to man . Divided , yet in a stronger sense united , by mountain chains and mighty rivers , our diversified mineral resources may ...
... portion of our land . Our territory epitomizes the processes of all time and their useful results to man . Divided , yet in a stronger sense united , by mountain chains and mighty rivers , our diversified mineral resources may ...
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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