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 140
... sulphides of the Haile mine , South Carolina , but without success . The placers of Forty - Mile Creek , Alaska , were discovered . The Empire State mines , Idaho , were located . Important discoveries were made in the Eagle Creek ...
... sulphides of the Haile mine , South Carolina , but without success . The placers of Forty - Mile Creek , Alaska , were discovered . The Empire State mines , Idaho , were located . Important discoveries were made in the Eagle Creek ...
Stran 154
... sulphides , they are oxidized with the attendant production of sulphuric acid , and thus go readily into solution . Several , however , such as zinc and copper , are ap- parently redeposited at or not far below the line of the permanent ...
... sulphides , they are oxidized with the attendant production of sulphuric acid , and thus go readily into solution . Several , however , such as zinc and copper , are ap- parently redeposited at or not far below the line of the permanent ...
Stran 156
... sulphide . " Similar results were obtained with the sulphides of mercury , copper , zinc , and , of course , arsenic and antimony . The sulphides of lead and silver could not be brought in solution , the former not even when heated to ...
... sulphide . " Similar results were obtained with the sulphides of mercury , copper , zinc , and , of course , arsenic and antimony . The sulphides of lead and silver could not be brought in solution , the former not even when heated to ...
Stran 158
... sulphides , there are but few definite data avail- able , and , in fact , the problem is much more difficult than ... sulphide or sodic sul- phide is evidently of great importance . This reaction was shown by Dr. G. F. Becker to have ...
... sulphides , there are but few definite data avail- able , and , in fact , the problem is much more difficult than ... sulphide or sodic sul- phide is evidently of great importance . This reaction was shown by Dr. G. F. Becker to have ...
Stran 159
... sulphides as pyrite and galena were especially attractive . This action is analogous to the electro - plating process , the accretion being of practically uniform thickness all over the nucleus . Further , gold crystals have been found ...
... sulphides as pyrite and galena were especially attractive . This action is analogous to the electro - plating process , the accretion being of practically uniform thickness all over the nucleus . Further , gold crystals have been found ...
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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