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 31
... placers , poor and comparatively limited in extent , were found in California , so unimportant , in fact , that they were not heard of outside the country . The first placer discovered was found by the Mexicans as early as 1775 , and is ...
... placers , poor and comparatively limited in extent , were found in California , so unimportant , in fact , that they were not heard of outside the country . The first placer discovered was found by the Mexicans as early as 1775 , and is ...
Stran 32
... placers , located in the Sierra San Fernando , forty - five miles northwest from the Pueblo Los Angeles , were dis- covered . These were the most productive deposits so far found and were worked in a small way for twenty years or more ...
... placers , located in the Sierra San Fernando , forty - five miles northwest from the Pueblo Los Angeles , were dis- covered . These were the most productive deposits so far found and were worked in a small way for twenty years or more ...
Stran 44
... placers in Silver Bow Basin , which were located , in the same year , by Joseph Juneau , just above the town which bears his name . Rich placers were discovered on Cummins Creek , which , in 1893 , were worked extensively . The Big ...
... placers in Silver Bow Basin , which were located , in the same year , by Joseph Juneau , just above the town which bears his name . Rich placers were discovered on Cummins Creek , which , in 1893 , were worked extensively . The Big ...
Stran 47
... placers , the attention of the miners was turned toward the source of such gold , which in many instances was revealed by the ordinary operations of working the placers , the gravels being gradually worked up stream until the ledges ...
... placers , the attention of the miners was turned toward the source of such gold , which in many instances was revealed by the ordinary operations of working the placers , the gravels being gradually worked up stream until the ledges ...
Stran 48
... placer regions , and they have been prospected in many places , but have as yet proved of too low - grade , or of too ... placers were discovered in the Silver Bow Basin , and the following year those of Douglas Island were located . The ...
... placer regions , and they have been prospected in many places , but have as yet proved of too low - grade , or of too ... placers were discovered in the Silver Bow Basin , and the following year those of Douglas Island were located . The ...
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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