- 行业: 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 ...
Wales. Underclay. Apparently a survival of the obsolete form of puncheon (punchin)--a supporting timber in a coal mine or in a building floor timber. Also spelled pounson.
Industry:Mining
Walnut-to almond-size pebble with an opal center; ironstone covered with a thin band of opal, or hollow; near Yowah station, western Queensland, Australia. A subvariety of boulder opal.
Industry:Mining
War. The shelly, conglomeratic basement limestone bed of the Lower Lias. So called because the stones, if dry, ring when struck. Compare: sun bed.
Industry:Mining
Warping in the beds overlying a reef, as a result of differential compaction.
Industry:Mining
Washing waste material, such as mill tailings and ground waste rock, into stopes with water to prevent failure of rock walls and subsidence. Problems involved in its use are stope preparation, choice and mixing of material, its particle size distribution, wear on 1553 pipe, and removal of water that transports the material into the mine. Compressed air may be used to force the filling through pipes.
Industry:Mining
Water charged naturally with carbon dioxide. Also applied to natural waters containing sulfur compounds, esp. sulfates.
Industry:Mining
Water circulated through the drill string, past the bit, and then out of the borehole between the rods and the walls of the hole while drilling or during washing operations.
Industry:Mining
