- 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 ...
The circulation fluid and entrained cuttings overflowing the collar when drilling a borehole.
Industry:Mining
The circulation of a drilling fluid, the flow of which is not restricted by obstructing materials in the borehole or inside the drill string.
Industry:Mining
The circulation of air through the drilling apparatus during drilling to cool the bit and to remove the cuttings from the hole.
Industry:Mining
The circulation, control, and utilization of air produced by the fan to ventilate the mine workings.
Industry:Mining
The classification of stoping methods adopted by the U.S. Bureau of Mines, devised largely on the basis of rock stability, is as follows: (1) stopes naturally supported--this includes open stoping with open stopes in small orebodies, and sublevel stoping; and open stopes with pillar supports that includes casual pillars and room (or stope) and 3120 pillar (regular arrangement); (2) stopes artifically supported--this includes shrinkage stoping, with pillars, without pillars, and with subsequent waste filling; cut-and-fill stoping; stulled stopes in narrow veins; and square-set stoping; (3) cave stopes--this includes caving (ore broken by induced caving), block caving, including caving to main levels and caving to chutes or branched raises; sublevel caving and top slicing (mining under a mat that, together with caved capping, follows the mining downward in successive stages); and (4) combinations of supported and caved stopes (as shrinkage stoping with pillar caving, cut-and-fill stoping with top slicing of pillars, etc.)
Industry:Mining
The classification, composition, properties, trade grades, sources, and the methods of recovery, fashioning, and use of gem minerals and gem materials and their substitutes.
Industry:Mining
The cleaning of coal or ore by air currents as opposed to wet cleaning by water currents. Appliances for the dry cleaning of coal were first introduced about 1850 and since that date a variety of methods have been developed.
Industry:Mining
The clear unobstructed distance between the inner extremities of the two supports of a beam. This dimension is always less than the effective span.
Industry:Mining
