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 53
... quartz and pyrite deposits have led to much exploration for gold , but no significant amount has yet been found . " " Quartz veins are found in Montgomery County , which have been prospected but without results . The Gray Eagle and ...
... quartz and pyrite deposits have led to much exploration for gold , but no significant amount has yet been found . " " Quartz veins are found in Montgomery County , which have been prospected but without results . The Gray Eagle and ...
Stran 59
... quartz being literally filled with gold . Immediately following the discovery on Gold Hill , and in the same month , rich quartz ledges were discovered on Massachusetts , Ophir and Rich hills by G. D. Roberts . The location of the ...
... quartz being literally filled with gold . Immediately following the discovery on Gold Hill , and in the same month , rich quartz ledges were discovered on Massachusetts , Ophir and Rich hills by G. D. Roberts . The location of the ...
Stran 73
... quartz mines which were located in 1863. The Oro Fino and War Eagle mines were the first of impor- tance discovered , which were followed in 1865 by the Golden Chariot and Poorman . The first mill was built in 1864. In 1868 , the Oro ...
... quartz mines which were located in 1863. The Oro Fino and War Eagle mines were the first of impor- tance discovered , which were followed in 1865 by the Golden Chariot and Poorman . The first mill was built in 1864. In 1868 , the Oro ...
Stran 78
... quartz found in pyritous mica - schist occurs at Baileyville on the Maine side of the St. Croix River.3 Professor C. H. Hitchcock thinks that the Ammonoosuc gold field of New Hampshire and Vermont probably extends into Maine ...
... quartz found in pyritous mica - schist occurs at Baileyville on the Maine side of the St. Croix River.3 Professor C. H. Hitchcock thinks that the Ammonoosuc gold field of New Hampshire and Vermont probably extends into Maine ...
Stran 82
... quartz , together with the gravel , are estimated as being 65 feet thick . The principal occur- rences were along the Great Charlton River , although traces have been found in many localities , especially at Kirksville in Adair County ...
... quartz , together with the gravel , are estimated as being 65 feet thick . The principal occur- rences were along the Great Charlton River , although traces have been found in many localities , especially at Kirksville in Adair County ...
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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