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 78
... gold , silver , lead , and copper . The Sul- livan mine yielded gold and silver.2 Gold - bearing quartz found in pyritous mica - schist occurs at Baileyville on the Maine side of the St. Croix River.3 Professor C. H. Hitchcock thinks ...
... gold , silver , lead , and copper . The Sul- livan mine yielded gold and silver.2 Gold - bearing quartz found in pyritous mica - schist occurs at Baileyville on the Maine side of the St. Croix River.3 Professor C. H. Hitchcock thinks ...
Stran 94
... gold - producing district in 1770 , being known to the American prospectors as the " Pot Holes , " but was formerly known as San Dyonisius and later included in the Mission of Concepcion.3 Gold - bearing lodes were discovered at Pinos ...
... gold - producing district in 1770 , being known to the American prospectors as the " Pot Holes , " but was formerly known as San Dyonisius and later included in the Mission of Concepcion.3 Gold - bearing lodes were discovered at Pinos ...
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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