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
... especially gold and silver deposits , has been entered into in considerable detail , with many references to actual operations as obtained from the technical press . In like manner the milling and metallurgical processes have been ...
... especially gold and silver deposits , has been entered into in considerable detail , with many references to actual operations as obtained from the technical press . In like manner the milling and metallurgical processes have been ...
Stran 1
... especially in the form of mineral re- sources , that all nations seek to acquire territory rich in mines of metals and fossil fuels . Further , no nation has made material advance in civilization without such mines , while by some ...
... especially in the form of mineral re- sources , that all nations seek to acquire territory rich in mines of metals and fossil fuels . Further , no nation has made material advance in civilization without such mines , while by some ...
Stran 6
... especially those required in the mining regions of California and Australia , was the immediate effect ; and further , what was ultimately to be of great importance was a demand for means of transporting such supplies , together with ...
... especially those required in the mining regions of California and Australia , was the immediate effect ; and further , what was ultimately to be of great importance was a demand for means of transporting such supplies , together with ...
Stran 11
... especially true of the towns that sprang up in placer mining districts , but was by no means confined to them . Many of such were boom towns that failed to boom , but for the failure of which mining has been blamed . Others served their ...
... especially true of the towns that sprang up in placer mining districts , but was by no means confined to them . Many of such were boom towns that failed to boom , but for the failure of which mining has been blamed . Others served their ...
Stran 15
... especially in the arid and semiarid regions , by the development of isolated water powers , transmitting this power many miles for the purpose of operating mining machinery ; and now the electrical furnace and other electro ...
... especially in the arid and semiarid regions , by the development of isolated water powers , transmitting this power many miles for the purpose of operating mining machinery ; and now the electrical furnace and other electro ...
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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