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 42
... County and considerable excitement resulted , but it was proven to be of small economic importance . This discovery stim- ulated prospecting and development . The Silver Hill mine and Pinetuckey mine , Randolph County , were operating ...
... County and considerable excitement resulted , but it was proven to be of small economic importance . This discovery stim- ulated prospecting and development . The Silver Hill mine and Pinetuckey mine , Randolph County , were operating ...
Stran 52
... County and the Vulture and Union mines of Maricopa County were actively operated . In Pinal County the Silver King and Mammoth mines were the principal features . Very little silver mining was done except at the Seven Stars , formerly ...
... County and the Vulture and Union mines of Maricopa County were actively operated . In Pinal County the Silver King and Mammoth mines were the principal features . Very little silver mining was done except at the Seven Stars , formerly ...
Stran 53
... County , and the presence of the metals is attributed to the action of chalybeate springs.2 " Samples collected ... County , which have been prospected but without results . The Gray Eagle and Golden Wonder belts extending into Gar- land ...
... County , and the presence of the metals is attributed to the action of chalybeate springs.2 " Samples collected ... County , which have been prospected but without results . The Gray Eagle and Golden Wonder belts extending into Gar- land ...
Stran 60
... County near Sonora , in 1852 , is the first of any importance found in the state . It was located by Mexicans , who are reported to have taken a large amount of gold from the mine . J. F. Talbott discovered the placer deposits at ...
... County near Sonora , in 1852 , is the first of any importance found in the state . It was located by Mexicans , who are reported to have taken a large amount of gold from the mine . J. F. Talbott discovered the placer deposits at ...
Stran 61
... counties were the largest producers of gold . Little silver was produced in the state . Electricity was applied to the principal mines of the Bodie district , power being generated in Mono County . There was a marked increase in the ...
... counties were the largest producers of gold . Little silver was produced in the state . Electricity was applied to the principal mines of the Bodie district , power being generated in Mono County . There was a marked increase in the ...
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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