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 2
... principal element in progress . It may be said , in general , that the history of the mining industry of a country is the history of the state of civilization at the time . That nation that has the greatest output , or can control the ...
... principal element in progress . It may be said , in general , that the history of the mining industry of a country is the history of the state of civilization at the time . That nation that has the greatest output , or can control the ...
Stran 18
... 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 equipment , or lack of ...
... 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 equipment , or lack of ...
Stran 21
... principal source of native copper was the Lake Superior mines.3 Lemoyne in his Brevis Narratio of the journey made by Laudon- nière in 1564 says : " That chief sent me a sheet of copper dug from those mountains ( Appalachian ) , from ...
... principal source of native copper was the Lake Superior mines.3 Lemoyne in his Brevis Narratio of the journey made by Laudon- nière in 1564 says : " That chief sent me a sheet of copper dug from those mountains ( Appalachian ) , from ...
Stran 25
... principal localities where such metals are now known to exist and usually lie in this bordering zone . Masses of native copper with pieces of native silver attached have been found in the mounds of the Mississippi valley , which would ...
... principal localities where such metals are now known to exist and usually lie in this bordering zone . Masses of native copper with pieces of native silver attached have been found in the mounds of the Mississippi valley , which would ...
Stran 41
... principal mines and districts in their chronological order , both with respect to the whole country and to the individual state or territory . No attempt will be made to give a complete and exhaustive account of the discoveries and ...
... principal mines and districts in their chronological order , both with respect to the whole country and to the individual state or territory . No attempt will be made to give a complete and exhaustive account of the discoveries 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