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 56
Stran vii
... Timber- 448 Supplementary Mining Methods . Mine Support . ber . - Timbering : Posts , Stulls , Sets and Square - sets . ing of Shafts . — Drainage . Ventilation CHAPTER VI . EXTRACTION OF VALUES . HISTORICAL SKETCH . METHODS OF ...
... Timber- 448 Supplementary Mining Methods . Mine Support . ber . - Timbering : Posts , Stulls , Sets and Square - sets . ing of Shafts . — Drainage . Ventilation CHAPTER VI . EXTRACTION OF VALUES . HISTORICAL SKETCH . METHODS OF ...
Stran 9
... , burning away the by - product of 90 per cent of all our coke ovens , and cutting down our vast forests without replanting . In fact , except in the Northwest , and we are borrow- And we shall sooner our timber PRECIOUS METAL MINING . 9.
... , burning away the by - product of 90 per cent of all our coke ovens , and cutting down our vast forests without replanting . In fact , except in the Northwest , and we are borrow- And we shall sooner our timber PRECIOUS METAL MINING . 9.
Stran 10
... timber resources are almost exhausted , ing largely from Canada and from abroad . or later have to borrow more than timber . When we reach that stage we will make less money , which will be far from an evil , for it may oblige us to ...
... timber resources are almost exhausted , ing largely from Canada and from abroad . or later have to borrow more than timber . When we reach that stage we will make less money , which will be far from an evil , for it may oblige us to ...
Stran 24
... timber . Furthermore , the 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 ...
... timber . Furthermore , the 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 ...
Stran 70
... timber , and water within two or three miles of said mines . " Trans . Am . Inst . Min . Engrs . , Vol . 5 , p . 169 , 1876–77 . • Whitney's Metallic Wealth of the United States , 1854 , p . xxii . 5 Whitney's Metallic Wealth of the ...
... timber , and water within two or three miles of said mines . " Trans . Am . Inst . Min . Engrs . , Vol . 5 , p . 169 , 1876–77 . • Whitney's Metallic Wealth of the United States , 1854 , p . xxii . 5 Whitney's Metallic Wealth of the ...
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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