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 94
Stran vi
... FORMATION AND OCCURRENCE OF GOLD IN GRAVEL . GENERAL DISCUSSION OCCURRENCE IN VEINS BY STATES AND TERRITORIES Alabama , Alaska , Arizona , Arkansas , California , Canada , the Carolina Gold Belt , Colorado , Connecticut , Georgia ...
... FORMATION AND OCCURRENCE OF GOLD IN GRAVEL . GENERAL DISCUSSION OCCURRENCE IN VEINS BY STATES AND TERRITORIES Alabama , Alaska , Arizona , Arkansas , California , Canada , the Carolina Gold Belt , Colorado , Connecticut , Georgia ...
Stran 82
... formation , the productive part being composed of three strata of gravel , which on panning showed colors . However , tests did not show that sufficient gold could be obtained to pay for work- ing . The area covered by the drift is ...
... formation , the productive part being composed of three strata of gravel , which on panning showed colors . However , tests did not show that sufficient gold could be obtained to pay for work- ing . The area covered by the drift is ...
Stran 96
... formations of Ohio . . . This formation should be called the drift gold field rather than the Clermont gold field . " " Gold has also been found at Bellville , in southern Richland County , while about 1898 gold was discovered at ...
... formations of Ohio . . . This formation should be called the drift gold field rather than the Clermont gold field . " " Gold has also been found at Bellville , in southern Richland County , while about 1898 gold was discovered at ...
Stran 100
... formation , occupies the right shore of the river and extends itself by the north toward the sea . On the left shore , and in the bed of the river , the limestone has disappeared , giving place to potent strata of sandstone , on which ...
... formation , occupies the right shore of the river and extends itself by the north toward the sea . On the left shore , and in the bed of the river , the limestone has disappeared , giving place to potent strata of sandstone , on which ...
Stran 151
... Formation and Occurrence of Gold in Gravel . In J. F. Kemp's paper1 on the Formation of Veins is an excellent dis- cussion and summary of the principles involved , from which the following extracts are taken . " All problems of ore ...
... Formation and Occurrence of Gold in Gravel . In J. F. Kemp's paper1 on the Formation of Veins is an excellent dis- cussion and summary of the principles involved , from which the following extracts are taken . " All problems of ore ...
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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