| Geological Survey (U.S.) - Forest reserves - 1898 - 692 pages
...in that the proportion of large pieces obtained is small and much of the ore is quite soft, grinding to a fine powder during the handling incidental to...mining, cleaning, and transportation. The loss of ore during transportation is thus larger than it otherwise would be, while the high proportion of fine... | |
| Mineral industries - 1917 - 402 pages
...are unfavorable in that the proportion of large pieces obtained is small. Much of the ore is quite soft, and grinds to a fine powder during the handling...mining, cleaning, and transportation. The loss of ore during concentration and transport is therefore considerable ; and much of the fine ore shipped is... | |
| Geological Survey (U.S.) - Geology - 1910 - 314 pages
...the proportion of large pieces obtained is small, and much of the ore is soft and grinds to a line powder during the handling incidental to mining, cleaning,...district: Analysis of well-sorted and cleaned ore from 1 .hiaturi, [Dried at 212° Fl MnO2 86.25 MnO Fe,O, I'ti oxidi; Ni oxide A1,O, CaO MgO BaO K2OandNa2O... | |
| Mineral industries - 1916 - 822 pages
...unfavorable in that the proportion of large pieces obtained is small, and much of the ore is quite soft, and grinds to a fine powder during the handling...mining, cleaning and transportation. The loss of ore during concentration and transport is therefore considerable; and much of the fine ore shipped is considered... | |
| Geological Survey (U.S.) - Forest reserves - 1898 - 696 pages
...in that the proportion of large pieces obtained is small and muuL of the ore is quite soft, grinding to a fine powder during the handling incidental to...mining, cleaning, and transportation. The loss of ore during transportation is thus larger than it otherwise would be, while the high proportion of fine... | |
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