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 98
Stran 5
... Mining and Extraction of Values, and a Detailed D Walter Richard Crane. penetrating ... mines , as , for instance , in Australia and South Africa : in the former ... Minerals , Vol . 18 , p . 14 . - decade , the soil surveyors declare that ...
... Mining and Extraction of Values, and a Detailed D Walter Richard Crane. penetrating ... mines , as , for instance , in Australia and South Africa : in the former ... Minerals , Vol . 18 , p . 14 . - decade , the soil surveyors declare that ...
Stran 15
... minerals , thus making known more gen- erally and by more accurate methods ... Mines and other later institutions , have taken to the pick and the shovel ... MINING . 15 MINING SCHOOLS •
... minerals , thus making known more gen- erally and by more accurate methods ... Mines and other later institutions , have taken to the pick and the shovel ... MINING . 15 MINING SCHOOLS •
Stran 16
... mines have proven to be veritable mining schools ; for instance , the Comstock mines have furnished every country ... Minerals , Dec. , 1902 , p . 220 . 2 T. A. I. M. E. , Vol . 5 , p . 173 . witnessed the growth of a great gold and silver ...
... mines have proven to be veritable mining schools ; for instance , the Comstock mines have furnished every country ... Minerals , Dec. , 1902 , p . 220 . 2 T. A. I. M. E. , Vol . 5 , p . 173 . witnessed the growth of a great gold and silver ...
Stran 17
... minerals each year to produce 55,000,000 to 60,000,000 ounces of silver , 2,000,000 to 2,250,000 ounces of gold ... Mines and Minerals , Vol . 23 , p . 219 . ' Colliery Engineer , Vol . 18 , p . 13 . The growth of the mining industry has been ...
... minerals each year to produce 55,000,000 to 60,000,000 ounces of silver , 2,000,000 to 2,250,000 ounces of gold ... Mines and Minerals , Vol . 23 , p . 219 . ' Colliery Engineer , Vol . 18 , p . 13 . The growth of the mining industry has been ...
Stran 18
... Mineral Resources , " Dr. R. W. Raymond makes the following statements : 2 " Enough has been written , perhaps , concerning the curious , haphazard origin of our unique mining ... mines , and enriches only lawyers and experts . This lesson ...
... Mineral Resources , " Dr. R. W. Raymond makes the following statements : 2 " Enough has been written , perhaps , concerning the curious , haphazard origin of our unique mining ... mines , and enriches only lawyers and experts . This lesson ...
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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