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 1
... material advance in civilization without such mines , while by some authori- ties this claim has been narrowed down to include mines of the precious metals only . Reference may be made to Persia , Egypt , Greece and Italy , all of which ...
... material advance in civilization without such mines , while by some authori- ties this claim has been narrowed down to include mines of the precious metals only . Reference may be made to Persia , Egypt , Greece and Italy , all of which ...
Stran 6
... material rise in price of certain articles , 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 ...
... material rise in price of certain articles , 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 ...
Stran 16
... material pros- perity has made rapid and brilliant progress , it is evident that there is much that is wanting which has been pointed out by another in eminently fitting words : 2 " But let us conceal from ourselves the fact that mere ...
... material pros- perity has made rapid and brilliant progress , it is evident that there is much that is wanting which has been pointed out by another in eminently fitting words : 2 " But let us conceal from ourselves the fact that mere ...
Stran 18
... material produced . The principal causes of failure are probably : lack of proper foresight in the develop- ment and equipment of the property ; extreme positions taken by the management , i.e. , either too lavish expenditure in ...
... material produced . The principal causes of failure are probably : lack of proper foresight in the develop- ment and equipment of the property ; extreme positions taken by the management , i.e. , either too lavish expenditure in ...
Stran 87
... material that they were soon washing out as much as $ 1,000 a day with rockers . The prospect proved to be a puzzle to them , both with regard to the peculiar black appearance of the material and its shape , being angular instead of ...
... material that they were soon washing out as much as $ 1,000 a day with rockers . The prospect proved to be a puzzle to them , both with regard to the peculiar black appearance of the material and its shape , being angular instead of ...
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Alaska amalgamation andesite argentiferous assay auriferous average bed-rock blende calcite California Carolina cent chalcopyrite chlorination Colorado Comstock lode 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 gold and silver gold production gold-bearing granite gravel gray copper Gulch Hill hydraulic Ibid Idaho igneous rocks inches iron Jour lead limestone located mercury method Mexico mill Mineral Industry Mineral Resources Mines and Minerals Montana Mountain Nevada North North Carolina occur operations ore-bodies ounces output oxide placer mines placers porphyry precious metals Press probably production of gold pyrite quantities quartz quartz-veins Rept River roasting rocks schists shaft silver production Silver-bearing slate sluices smelting solution South stamps stope sulphides sulphurets surface TABLE tellurides tellurium tetrahedrite timber tion tons Total tunnel usually Utah veins width yield zinc