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 iv
... obtained from the technical press . In like manner the milling and metallurgical processes have been outlined and elaborated upon with extracts from reliable authorities . Further , the historical development of mining , milling and ...
... obtained from the technical press . In like manner the milling and metallurgical processes have been outlined and elaborated upon with extracts from reliable authorities . Further , the historical development of mining , milling and ...
Stran 21
... obtained from the wrecks of ships which had been thrown on the coast , and I am readily persuaded that this is true , for in the neigh- borhood of the Promontory ( Florida ) silver is more plentiful than to the northward . They assert ...
... obtained from the wrecks of ships which had been thrown on the coast , and I am readily persuaded that this is true , for in the neigh- borhood of the Promontory ( Florida ) silver is more plentiful than to the northward . They assert ...
Stran 22
... obtained were never located . 2 In 1516 , however , Diego Miruelo obtained a little gold from the natives , ' and in 1519 Pineda , who coasted along the western coast of the peninsula and along the Texan coast , reported that many of ...
... obtained were never located . 2 In 1516 , however , Diego Miruelo obtained a little gold from the natives , ' and in 1519 Pineda , who coasted along the western coast of the peninsula and along the Texan coast , reported that many of ...
Stran 27
... obtained from which bullets were made . These mines were not worked , however , until 1874 or thereabouts . In a report by Thomas Jefferson in 1782 , a brief account is given of the finding of a piece of ore on the Rappahannock ...
... obtained from which bullets were made . These mines were not worked , however , until 1874 or thereabouts . In a report by Thomas Jefferson in 1782 , a brief account is given of the finding of a piece of ore on the Rappahannock ...
Stran 29
... obtained from the Indians , which was in every case proven worthless , the expeditions returning discouraged and much the worse physically from the hardships encountered . These excursions into California , Arizona and New Mexico took ...
... obtained from the Indians , which was in every case proven worthless , the expeditions returning discouraged and much the worse physically from the hardships encountered . These excursions into California , Arizona and New Mexico took ...
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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