- 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 ...
Widely used for draining methane in coal mines in the United States where the roomand- pillar method is employed. They are panel entries driven on a perimeter of a block of coal being mined and maintained as exhaust airways to remove methane promptly from the working faces to prevent buildup of high concentrations either at the face or in the main intake airways. They are maintained, after mining is completed, in preference to sealing the completed workings.
Industry:Mining
Width of a lode that is designated for treatment in a mill, as calculated with regard to daily tonnage. Any excess broken during mining (stoping width) should be rejected before milling.
Industry:Mining
Winding system in which both cages in a mine shaft are connected to the same rope, via the drum.
Industry:Mining
Winding, usually in compound shafts, where the wind is divided into two or more stages, and underground winding engines are installed to deal with the lower stages.
Industry:Mining
Wire leading from any of various points of an electric system to a central station, where a voltmeter indicates the potential of the system at the point.
Industry:Mining
Wire meshes with specific-sized openings for grading particles of various sizes.
Industry:Mining
Wire or fiber rope or cable in which the strands formed from a group of individual wires or fibers are twisted to the right.
Industry:Mining
Wire or fiber rope or cable in which the wires or fibers in a strand and the strands themselves are twisted to the left.
Industry:Mining
