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 98
Stran vi
... Wide Veins . — California : the Utica mine , Mother lode.- Alaska : the Alaska - Treadwell mines South Dakota : the Homestake mines . Idaho : the Coeur d'Alêne Mines Methods of Extraction in Bedded Deposits . Utah : the Mercur mines 431 ...
... Wide Veins . — California : the Utica mine , Mother lode.- Alaska : the Alaska - Treadwell mines South Dakota : the Homestake mines . Idaho : the Coeur d'Alêne Mines Methods of Extraction in Bedded Deposits . Utah : the Mercur mines 431 ...
Stran 8
... wide range of territory for ore , fuel and flux . The following reported extracts are taken from an address by Dr. James Douglas regarding the Relations of Railway Transporta- tion to Mining and Metallurgy : 1 " Starting from the period ...
... wide range of territory for ore , fuel and flux . The following reported extracts are taken from an address by Dr. James Douglas regarding the Relations of Railway Transporta- tion to Mining and Metallurgy : 1 " Starting from the period ...
Stran 50
... wide and merited fame . It is one of the richest , most exten- sive , and remarkable deposits of gold quartz upon the continent ; and its returns , up to this time , are believed to be but an earnest of what may be expected from it in ...
... wide and merited fame . It is one of the richest , most exten- sive , and remarkable deposits of gold quartz upon the continent ; and its returns , up to this time , are believed to be but an earnest of what may be expected from it in ...
Stran 104
... wide by 80 long . In 1905 , properties were being developed in the southern Hills.1 Tennessee . The many relics of mining operations in the shape of tools and workings on copper , lead and zinc veins in the state would seem to indicate ...
... wide by 80 long . In 1905 , properties were being developed in the southern Hills.1 Tennessee . The many relics of mining operations in the shape of tools and workings on copper , lead and zinc veins in the state would seem to indicate ...
Stran 110
... wide , mostly on the east- ern side of the Green Mountains , which is known to contain gold , in which area there has been found many traces of float gold . The Ammonoosuc gold field along the Connecticut River , and lying mostly in New ...
... wide , mostly on the east- ern side of the Green Mountains , which is known to contain gold , in which area there has been found many traces of float gold . The Ammonoosuc gold field along the Connecticut River , and lying mostly in New ...
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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