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 66
... veins above Georgetown and Silver Plume.1 The Whale lode was first worked in 1861. Silver ores were also recognized especially in the Running lode . The Pelican and Dives mines were located in 1868. The Specie Payment at the head of ...
... veins above Georgetown and Silver Plume.1 The Whale lode was first worked in 1861. Silver ores were also recognized especially in the Running lode . The Pelican and Dives mines were located in 1868. The Specie Payment at the head of ...
Stran 78
... veins on the farm of Mr. Samuel Ellicott , in Montgomery County , some thirty miles west of Baltimore . Reported assays of samples from these veins show , it is claimed , a range in value of $ 168 , $ 610 , and $ 787 per ton . As no ...
... veins on the farm of Mr. Samuel Ellicott , in Montgomery County , some thirty miles west of Baltimore . Reported assays of samples from these veins show , it is claimed , a range in value of $ 168 , $ 610 , and $ 787 per ton . As no ...
Stran 153
... Veins , however , extend much . deeper ; hence some other source than the meteoric must be found for the water which has in large part deposited the vein fillings . This point about the comparatively shallow penetration of the meteoric ...
... Veins , however , extend much . deeper ; hence some other source than the meteoric must be found for the water which has in large part deposited the vein fillings . This point about the comparatively shallow penetration of the meteoric ...
Stran 155
... veins and other deposits , a few extracts from Mr. Lindgren's report on The Gold - quartz veins of Nevada City and Grass Valley districts , California3 will help to explain . " According to Fuchs , amorphous freshly prepared silica is ...
... veins and other deposits , a few extracts from Mr. Lindgren's report on The Gold - quartz veins of Nevada City and Grass Valley districts , California3 will help to explain . " According to Fuchs , amorphous freshly prepared silica is ...
Stran 160
... veins , the gold having been concentrated from the decomposed sulphides . " 2 Many theories have been advanced to account for the occurrence of gold grains and nuggets in gravels , the most obvious one being the disintegration of quartz ...
... veins , the gold having been concentrated from the decomposed sulphides . " 2 Many theories have been advanced to account for the occurrence of gold grains and nuggets in gravels , the most obvious one being the disintegration of quartz ...
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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