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 |
Iz vsebine knjige
Zadetki 1–5 od 68
Stran 12
... stamp to Wilson and Ball , and they were quickly adopted in the Lake Superior copper region . " By skillful improvements they have been increased in efficiency until from a few tons per day they are now capable of crushing several ...
... stamp to Wilson and Ball , and they were quickly adopted in the Lake Superior copper region . " By skillful improvements they have been increased in efficiency until from a few tons per day they are now capable of crushing several ...
Stran 40
... stamps as to be easily seen , are separated by hand , the coarse metal from the stamps being picked over with care for that purpose . The silver occur- ring only occasionally , and then often in masses of considerable size , there can ...
... stamps as to be easily seen , are separated by hand , the coarse metal from the stamps being picked over with care for that purpose . The silver occur- ring only occasionally , and then often in masses of considerable size , there can ...
Stran 72
... stamp - mill was built at the Shingleton mine in 1866 , by Dr. Hamilton . The chlorination process was experimented with at Dahlonega , and the Clopton mine , Villa Rica ; at the former some years ago , at the latter recently . In 1892 ...
... stamp - mill was built at the Shingleton mine in 1866 , by Dr. Hamilton . The chlorination process was experimented with at Dahlonega , and the Clopton mine , Villa Rica ; at the former some years ago , at the latter recently . In 1892 ...
Stran 79
... stamp mill was erected and later a ten- stamp mill took its place . In 1889 , owing to the successful operation of the Harrison prop- erty , a number of other properties were developed , the most impor- tant being the Allerton - Ream ...
... stamp mill was erected and later a ten- stamp mill took its place . In 1889 , owing to the successful operation of the Harrison prop- erty , a number of other properties were developed , the most impor- tant being the Allerton - Ream ...
Stran 98
... stamp mill ; however , the Champion installed a 10 - stamp mill in 1895. The production of both gold and silver showed a marked decrease , which was fol- lowed in 1896 by an increase in gold production , due to the Baker City mines and ...
... stamp mill ; however , the Champion installed a 10 - stamp mill in 1895. The production of both gold and silver showed a marked decrease , which was fol- lowed in 1896 by an increase in gold production , due to the Baker City mines and ...
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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