- 行业: Mining
- Number of terms: 33118
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- 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 thrust fault cutting strata on the steeply dipping flank of an asymmetrical anticline.
Industry:Mining
A timber frame to support the roof, sides, and sometimes the floor of mine roadways or shafts. For a mine roadway, the simplest timber set consists of a crossbar, cap, or collar supported on two upright posts or arms with round or board lagging. Such a set will resist roof pressure and moderate side pressure and is erected at intervals of from 2 to 6 ft (0.6 to 1.8 m). The timbers are about 5 to 10 in (12.7 to 25.4 cm) in diameter. In South Wales, such a timber set is known as double timber.
Industry:Mining
A timber or metal sill placed transversely under the rails of a railroad, tramway, or minecar track.
Industry:Mining
A timber or steel lining inserted for a limited period until a permanent shaft support is installed.
Industry:Mining
A timber placed near the face of working places to afford protection for the workers at the face. It must be set like a line timber and with equal care.
Industry:Mining
A timber set under the walking beam to prevent it from falling on members of the drilling crew when it is disconnected.
Industry:Mining
