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 97
Stran vi
... Drift - Mining . - Dredging . 357 405 413 . Methods of Extraction in Narrow Veins . The Southern States : the Franklin and Cross mines . Colorado : the Camp Bird , Standley and Cripple Creek mines 423 Methods of Extraction in Wide Veins ...
... Drift - Mining . - Dredging . 357 405 413 . Methods of Extraction in Narrow Veins . The Southern States : the Franklin and Cross mines . Colorado : the Camp Bird , Standley and Cripple Creek mines 423 Methods of Extraction in Wide Veins ...
Stran 23
... drift and in veins . However , the northern Indians were not without traditions regarding the occurrence of mineral riches , but their accounts usu- ally referred to some distant locality . Charles Whittlesey in his paper " Ancient ...
... drift and in veins . However , the northern Indians were not without traditions regarding the occurrence of mineral riches , but their accounts usu- ally referred to some distant locality . Charles Whittlesey in his paper " Ancient ...
Stran 75
... drift , and sometimes charlatans , professing to be geologists , have availed themselves of this fact to proclaim to ... drift . It is seldom found along the larger streams , but occurs in the sands and gravels of the small streams which ...
... drift , and sometimes charlatans , professing to be geologists , have availed themselves of this fact to proclaim to ... drift . It is seldom found along the larger streams , but occurs in the sands and gravels of the small streams which ...
Stran 76
... drift , which is gold - bearing , covers thousands of square miles and ranges from 10 to 500 feet deep ( 13th Annual Rept . , 1883 ) . According to the First Annual Report of the State Geologist issued in 1869 , gold was found in ...
... drift , which is gold - bearing , covers thousands of square miles and ranges from 10 to 500 feet deep ( 13th Annual Rept . , 1883 ) . According to the First Annual Report of the State Geologist issued in 1869 , gold was found in ...
Stran 80
... drift in Fillmore County . Small quantities of gold were also found at Jordan and Spring Valley . However , the locality in which the most gold was found as a gravel - content , was from Rochester to the Wabasha County line on the ...
... drift in Fillmore County . Small quantities of gold were also found at Jordan and Spring Valley . However , the locality in which the most gold was found as a gravel - content , was from Rochester to the Wabasha County line on 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