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 27
... galena were obtained from which bullets were made . These mines were not worked , however , until 1874 or thereabouts . In a report by Thomas Jefferson in 1782 , a brief account is given of the finding of a piece of ore on the ...
... galena were obtained from which bullets were made . These mines were not worked , however , until 1874 or thereabouts . In a report by Thomas Jefferson in 1782 , a brief account is given of the finding of a piece of ore on the ...
Stran 63
... galena.3 Hydraulic mining was , according to Lieber , first practiced at Pilot Mountain in Burke County , North Carolina , some time prior to 1859 . The successful treatment of sulphurets was accomplished about 1879. For an excellent ...
... galena.3 Hydraulic mining was , according to Lieber , first practiced at Pilot Mountain in Burke County , North Carolina , some time prior to 1859 . The successful treatment of sulphurets was accomplished about 1879. For an excellent ...
Stran 67
... Galena mine in 1879. Messrs . Allbright and Fuller located the Little Rock claim which covers a part of the present Smuggler mine . This was on July 5 , 1879 , and on the 30th of August the Smuggler was located by Charles Bennett . Ten ...
... Galena mine in 1879. Messrs . Allbright and Fuller located the Little Rock claim which covers a part of the present Smuggler mine . This was on July 5 , 1879 , and on the 30th of August the Smuggler was located by Charles Bennett . Ten ...
Stran 68
... galena . Stratton on examining them with a glass detected cubes of rusty gold , but did not recognize the sylvanite , which had been taken for galena by Houghton . Further , it is not recorded who was first to recognize the tellurides ...
... galena . Stratton on examining them with a glass detected cubes of rusty gold , but did not recognize the sylvanite , which had been taken for galena by Houghton . Further , it is not recorded who was first to recognize the tellurides ...
Stran 70
... galena is found in the state which is often highly argentiferous . Probably the most important silver - lead mine was near Middletown , and was worked in a limited way during 1852 . It is supposed that this mine was operated many years ...
... galena is found in the state which is often highly argentiferous . Probably the most important silver - lead mine was near Middletown , and was worked in a limited way during 1852 . It is supposed that this mine was operated many years ...
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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