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 vi
... Treadwell mines South Dakota : the Homestake mines . Idaho : the Coeur d'Alêne Mines Methods of Extraction in Bedded Deposits . Utah : the Mercur mines 431 • 441 Methods of Extracting in Masses . Surface pits or Glory vi CONTENTS .
... Treadwell mines South Dakota : the Homestake mines . Idaho : the Coeur d'Alêne Mines Methods of Extraction in Bedded Deposits . Utah : the Mercur mines 431 • 441 Methods of Extracting in Masses . Surface pits or Glory vi CONTENTS .
Stran vii
... Masses . Surface pits or Glory Holes . . PAGE Nevada : the Comstock mines ; 446 Kinds of Tim- Timber- 448 Supplementary Mining Methods . Mine Support . ber . - Timbering : Posts , Stulls , Sets and Square - sets . ing of Shafts ...
... Masses . Surface pits or Glory Holes . . PAGE Nevada : the Comstock mines ; 446 Kinds of Tim- Timber- 448 Supplementary Mining Methods . Mine Support . ber . - Timbering : Posts , Stulls , Sets and Square - sets . ing of Shafts ...
Stran 22
... masses of these precious metals were picked up by the natives in pockets , or gathered in the beds of streams flowing through auriferous regions , and perforated and worn as pendants . Gold beads evidently not European in their ...
... masses of these precious metals were picked up by the natives in pockets , or gathered in the beds of streams flowing through auriferous regions , and perforated and worn as pendants . Gold beads evidently not European in their ...
Stran 24
... masses of copper they extracted from the pits could hardly have been transported in the light Indian canoes of to - day . There might , however , have been another people possessed of wooden boats , known to the ancestors of the present ...
... masses of copper they extracted from the pits could hardly have been transported in the light Indian canoes of to - day . There might , however , have been another people possessed of wooden boats , known to the ancestors of the present ...
Stran 25
... Masses of native copper with pieces of native silver attached have been found in the mounds of the Mississippi valley , which would seem to indicate that the Indians were not acquainted with methods of treating metal other than by ...
... Masses of native copper with pieces of native silver attached have been found in the mounds of the Mississippi valley , which would seem to indicate that the Indians were not acquainted with methods of treating metal other than by ...
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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