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 44
... Gold - bearing ledges were discovered near Taku , together with other gold ledges and 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 ...
... Gold - bearing ledges were discovered near Taku , together with other gold ledges and 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 ...
Stran 47
... gold district , to which I am much indebted . The discoveries and ... gold , which in many instances was revealed by the ordinary operations of working the ... bearing ledges on the banks immediately contiguous to the gravels . Further ...
... gold district , to which I am much indebted . The discoveries and ... gold , which in many instances was revealed by the ordinary operations of working the ... bearing ledges on the banks immediately contiguous to the gravels . Further ...
Stran 48
... gold - bearing lode , which ultimately became the site of one of the large open - cuts or " Glory Holes . " This claim was purchased from French Pete , by John Treadwell , for the sum of $ 4,000 . Work upon the lode revealed the ore ...
... gold - bearing lode , which ultimately became the site of one of the large open - cuts or " Glory Holes . " This claim was purchased from French Pete , by John Treadwell , for the sum of $ 4,000 . Work upon the lode revealed the ore ...
Stran 76
... gold occurs in exceedingly fine grains and scales : the loss in washing is therefore great . However , as much as 50 cents to $ 1.00 a day was made by panning . The statement is made that the glacial drift , which is gold - bearing ...
... gold occurs in exceedingly fine grains and scales : the loss in washing is therefore great . However , as much as 50 cents to $ 1.00 a day was made by panning . The statement is made that the glacial drift , which is gold - bearing ...
Stran 78
... gold and silver have been worked in this state , the most active mining operations having been carried on during the early eighty's ... bearing quartz found in pyritous mica - schist occurs at Baileyville on the ... gold 78 GOLD AND SILVER .
... gold and silver have been worked in this state , the most active mining operations having been carried on during the early eighty's ... bearing quartz found in pyritous mica - schist occurs at Baileyville on the ... gold 78 GOLD AND SILVER .
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Alaska amalgamation andesite argentiferous assay auriferous average bed-rock blende bornite calcite California Carolina cent chalcopyrite chloride chlorination Colorado Comstock lode concentration 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 gneiss gold and silver gold production Gold-bearing granite gravel gray copper Gulch Hill hydraulic Ibid Idaho inches iron Jour lead limestone located mercury method Mexico mill Mineral Industry Mineral Resources Mines and Minerals Montana Mountain Nevada North occur operations ore-bodies ounces output oxide placer mines placers porphyry precious metals Press probably production of gold pyrite pyrrhotite quantities quartz quartz-veins quartzites Rept rhyolite River rocks schists shaft siliceous silver production Silver-bearing slate sluices smelting solution South stamps stope sulphides sulphurets surface TABLE tellurides tellurium tetrahedrite timber tion tons Total tunnel Utah yield zinc