- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A percussive type of automatically rotated rock drill that is worked by compressed air. It is light enough to be used without a tripod and to be hand held.
Industry:Mining
A perforated metal or wirecloth sieve used to sort diamonds or fragments of diamonds according to size.
Industry:Mining
A perforated steel plate, set at an angle, over which large coal or other material slides by gravity to effect a primary classification.
Industry:Mining
A performance curve showing the expected results of a coal-preparation treatment.
Industry:Mining
A performance curve showing the results actually obtained from a coal preparation treatment.
Industry:Mining
A peridotite containing both clinopyroxene and orthopyroxene in addition to olivine.
Industry:Mining
A period of the Paleozoic era (after the Devonian and before the Pennsylvanian), thought to have covered the span of time between 345 and 320 million years ago; also, the corresponding system of rocks. It is named after the Mississippi River valley, in which there are good exposures of rocks of this age. It is the approximate equivalent of the Lower Carboniferous of European usage.
Industry:Mining
A period of the Paleozoic Era (after the Mississippian and before the Permian), thought to have covered the span of time between 320 million years and 280 million years ago; also, the corresponding system of rocks. It is named after the state of Pennsylvania in which rocks of this age are widespread and yield much coal. It is the approximate equivalent of the Upper Carboniferous of European usage.
Industry:Mining
