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 |
Iz vsebine knjige
Zadetki 1–5 od 100
Stran iv
... considerable detail , with many references to actual operations as obtained from the technical press . In like manner the milling and metallurgical processes have been outlined and elaborated upon with extracts from reliable authorities ...
... considerable detail , with many references to actual operations as obtained from the technical press . In like manner the milling and metallurgical processes have been outlined and elaborated upon with extracts from reliable authorities ...
Stran 37
... Considerable exploratory work was done in the neighborhood of Thunder Bay , between the years 1863 and 1867 , by McKellars , who reported the discovery of silver at a number of points . One of the discoveries , that at Current River ...
... Considerable exploratory work was done in the neighborhood of Thunder Bay , between the years 1863 and 1867 , by McKellars , who reported the discovery of silver at a number of points . One of the discoveries , that at Current River ...
Stran 39
... considerable quantities , and , what was more encouraging , in pieces as large often as a man's fist . The Indians could not be induced to reveal its source either by bribery or threats of coercion . The death of Dr. Houghton , who was ...
... considerable quantities , and , what was more encouraging , in pieces as large often as a man's fist . The Indians could not be induced to reveal its source either by bribery or threats of coercion . The death of Dr. Houghton , who was ...
Stran 40
... considerable size , there can be no doubt that a very considerable amount is purloined by the miners , who seem to consider the silver found in the vein as their property . " 1 Although considerable time has elapsed since then ( 1850 ) ...
... considerable size , there can be no doubt that a very considerable amount is purloined by the miners , who seem to consider the silver found in the vein as their property . " 1 Although considerable time has elapsed since then ( 1850 ) ...
Stran 41
... considerable prospecting was done by intruders . " After the discovery of gold , the long - pending efforts of the States to acquire these Indian lands were stimulated and accelerated by the added thirst for the precious metal , and ...
... considerable prospecting was done by intruders . " After the discovery of gold , the long - pending efforts of the States to acquire these Indian lands were stimulated and accelerated by the added thirst for the precious metal , and ...
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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