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 45
... district in British Columbia having been abandoned recently there were many idle miners to whom this reported find came as an alluring call , and great excitement prevailed . Next spring fully three hundred men crossed the summit for ...
... district in British Columbia having been abandoned recently there were many idle miners to whom this reported find came as an alluring call , and great excitement prevailed . Next spring fully three hundred men crossed the summit for ...
Stran 46
... districts , but from all over the states , which although insuring an increased output for the district , was in itself the cause of delay in the develop- ment of the district and kept the output below what it might have Eng . and Min ...
... districts , but from all over the states , which although insuring an increased output for the district , was in itself the cause of delay in the develop- ment of the district and kept the output below what it might have Eng . and Min ...
Stran 50
... district Tomb- stone ' as a reminder of the object that his friends said he would most need , if he dared enter this country of the Apache raids to search for minerals . " Within four years Tombstone became one of the largest cities of ...
... district Tomb- stone ' as a reminder of the object that his friends said he would most need , if he dared enter this country of the Apache raids to search for minerals . " Within four years Tombstone became one of the largest cities of ...
Stran 61
... district , San Bernardino County . The Randsburg district was discovered . During 1897 , hydraulic min- ing had increased materially in volume under the Caminetti law . Considerable activity was manifested both in new and old ...
... district , San Bernardino County . The Randsburg district was discovered . During 1897 , hydraulic min- ing had increased materially in volume under the Caminetti law . Considerable activity was manifested both in new and old ...
Stran 67
... district owing to the exhaustion of the rich and easily amalga- mated surface ores , and the occurrence of hard pyritic minerals in depth . However , improved methods in smelting saved the district by tiding the mines over the period of ...
... district owing to the exhaustion of the rich and easily amalga- mated surface ores , and the occurrence of hard pyritic minerals in depth . However , improved methods in smelting saved the district by tiding the mines over the period of ...
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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