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 ix
... Creek , Colorado Ten - Inch Square - Set at Durant Mine , Aspen , Colorado Patio Mills at Pachuca , Mexico Glory Hole Mining at the Combination Mine , Nevada Chamber in 1,250 - Foot Stope , Elkhorn Mine , Montana Square - Set Timbering ...
... Creek , Colorado Ten - Inch Square - Set at Durant Mine , Aspen , Colorado Patio Mills at Pachuca , Mexico Glory Hole Mining at the Combination Mine , Nevada Chamber in 1,250 - Foot Stope , Elkhorn Mine , Montana Square - Set Timbering ...
Stran 26
... Creek , Seminole and Cherokee nations . The Chattahoochee and Chestatee rivers , as well as other streams trav- ersing the gold belt , have been productive of many and quite exten- sive auriferous gravel deposits . It is therefore ...
... Creek , Seminole and Cherokee nations . The Chattahoochee and Chestatee rivers , as well as other streams trav- ersing the gold belt , have been productive of many and quite exten- sive auriferous gravel deposits . It is therefore ...
Stran 44
... Creek , which , in 1893 , were worked extensively . The Big Salmon River was prospected by a small party of miners ... creeks were prob- ably those referred to by this party . The latter is probably named after the head of the party ...
... Creek , which , in 1893 , were worked extensively . The Big Salmon River was prospected by a small party of miners ... creeks were prob- ably those referred to by this party . The latter is probably named after the head of the party ...
Stran 46
... Creek district in 1893 , with their subsidiary locations , all of which form connecting links in a chain of events continuous , but far from permanent in char- acter . The effects upon the development of the country have , however ...
... Creek district in 1893 , with their subsidiary locations , all of which form connecting links in a chain of events continuous , but far from permanent in char- acter . The effects upon the development of the country have , however ...
Stran 51
... creeks . The discovery and development of the Silver King mine is impor- tant in that it was largely through such efforts that ... Creek , and began the construction of a pack- road into the mountains . This pack - road commonly known as ...
... creeks . The discovery and development of the Silver King mine is impor- tant in that it was largely through such efforts that ... Creek , and began the construction of a pack- road into the mountains . This pack - road commonly known as ...
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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