- المجال: Mining
- Number of terms: 33118
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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 slanting screen in which the material to be screened passes down. The screen is kept in vibration by the impact of a large number of small hammers.
Industry:Mining
A slate-cutter's knifelike chopping tool for trimming roof slates, having a pointed pick at the back to make nail holes.
Industry:Mining
A slate-cutter's knifelike chopping tool for trimming roof slates, having a pointed pick at the back to make nail holes.
Industry:Mining
A slaty or schistose argillaceous rock whose spotted appearance is the result of incipient growth of porphyroblasts in response to contact metamorphism of low to medium intensity. Compare: desmosite; spilosite; adinole.
Industry:Mining
A slaty or schistose argillaceous rock whose spotted appearance is the result of incipient growth of porphyroblasts in response to contact metamorphism of low to medium intensity. Compare: desmosite; spilosite; adinole.
Industry:Mining