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 |
Iz vsebine knjige
Zadetki 1–5 od 100
Stran iii
... deposits and the industrial activities resulting therefrom , is necessarily of prime importance in a work of this character , its treatment has been broad and it has been approached from practically every side . In the chapter of the ...
... deposits and the industrial activities resulting therefrom , is necessarily of prime importance in a work of this character , its treatment has been broad and it has been approached from practically every side . In the chapter of the ...
Stran 15
... deposits from large 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 ...
... deposits from large 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 ...
Stran 32
... deposits of free gold were found at San Isidro , one hundred miles further west , in San Diego County . In 1833 , a little gold was gathered in the valley of the Santa Clara River in the northwestern part of Los Angeles County . Five ...
... deposits of free gold were found at San Isidro , one hundred miles further west , in San Diego County . In 1833 , a little gold was gathered in the valley of the Santa Clara River in the northwestern part of Los Angeles County . Five ...
Stran 53
... deposit of limonite , bearing gold and silver , about the year 1887. This occurs in Saline County , and the presence ... deposits have led to much exploration for gold , but no significant amount has yet been found . " " Quartz veins are ...
... deposit of limonite , bearing gold and silver , about the year 1887. This occurs in Saline County , and the presence ... deposits have led to much exploration for gold , but no significant amount has yet been found . " " Quartz veins are ...
Stran 60
... deposits at Indiana Hill in the spring of 1852. These were the first diggings found between the North Fork and Bear River . The Amargoza mine of San Bernardino County and in Death Valley , was discovered by immigrants on their way to ...
... deposits at Indiana Hill in the spring of 1852. These were the first diggings found between the North Fork and Bear River . The Amargoza mine of San Bernardino County and in Death Valley , was discovered by immigrants on their way to ...
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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