- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
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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 nonpersistent vein that is wide above and narrow below, and that terminates within the formation it traverses. The term was originally applied to vein fillings in vertical solution joints in limestone.
Industry:Mining
A normal H-section steel girder bent to a circular shape. The usual form consists of halves joined together at the crown by bolts and two fishplates. The arch girder is usually splay legged or straight legged in shape, but horseshoe shapes are also in use.
Industry:Mining
A normal longwall face on which new machines, such as a cutter loader, may be put to work to gain experience and perhaps improved. Such trials may disclose weaknesses, and they would also indicate the best support system, turnover, and other operating factors.
Industry:Mining
A normal longwall face on which new machines, such as a cutter loader, may be put to work to gain experience and perhaps improved. Such trials may disclose weaknesses, and they would also indicate the best support system, turnover, and other operating factors.
Industry:Mining
A normal stress that tends to cause separation across the plane on which it acts. Compare: compressive stress
Industry:Mining
A notched or fingered plank or light timber used to align ends of pipe being screwed together, as when laying a waterline.
Industry:Mining
A notice claiming a location upon this vein has only one meaning. It raises an inference that the notice was posted upon or in close proximity to a vein or lode, although, as a fact, no vein or lode then was exposed.
Industry:Mining
A notional figure expressed in tons per hour used in the title of a flowsheet and in general descriptions of the plant, applying to the plant as a whole and to the specific project under consideration. It may be taken as representing the approximate tonnage expected to be supplied to the plant during the hour of greatest load.
Industry:Mining
A noxious exhalation caused by the decomposition of organic remains; applied also to gases emanating from deep sources, such as mines, caves, and volcanic regions.
Industry:Mining
