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 vi
... mines . Colorado : the Camp Bird , Standley and Cripple Creek mines . . 423 Methods of Extraction in Wide Veins . — California : the Utica mine , Mother lode.- Alaska : the Alaska - Treadwell mines South Dakota : the Homestake mines ...
... mines . Colorado : the Camp Bird , Standley and Cripple Creek mines . . 423 Methods of Extraction in Wide Veins . — California : the Utica mine , Mother lode.- Alaska : the Alaska - Treadwell mines South Dakota : the Homestake mines ...
Stran 16
... mines have proven to be veritable mining schools ; for instance , the Comstock mines have furnished every country with superintendents . In times past the mines of Mexico , South Amer- ica , Alaska , Australia , Africa , India , China ...
... mines have proven to be veritable mining schools ; for instance , the Comstock mines have furnished every country with superintendents . In times past the mines of Mexico , South Amer- ica , Alaska , Australia , Africa , India , China ...
Stran 27
... mines of Newburyport , Massachusetts , were known prior to the Revolu- tionary War and that masses of galena were obtained from which bullets were made . These mines were not worked , however , until 1874 or thereabouts . In a report by ...
... mines of Newburyport , Massachusetts , were known prior to the Revolu- tionary War and that masses of galena were obtained from which bullets were made . These mines were not worked , however , until 1874 or thereabouts . In a report by ...
Stran 30
... miners . These mines were worked both by Indians and Mexicans , especially the latter , but always peaceably . Prior to 1860 most of the gold produced here found its way to Altar in Sonora , but later , when a United States Government ...
... miners . These mines were worked both by Indians and Mexicans , especially the latter , but always peaceably . Prior to 1860 most of the gold produced here found its way to Altar in Sonora , but later , when a United States Government ...
Stran 31
... mines should be worked for his benefit . This decree , together with the incessant attacks of the hostile Indians , so discouraged the treasure hunters that the mines were abandoned , as needs must be until the savages were exterminated ...
... mines should be worked for his benefit . This decree , together with the incessant attacks of the hostile Indians , so discouraged the treasure hunters that the mines were abandoned , as needs must be until the savages were exterminated ...
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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