- 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 number of crystals grown together so that each crystal in the group is large enough to be seen by the unaided eye and each crystal is more or less perfect. In gemmology, it differs from a crystalline aggregate, as a homogenous gem stone can be cut only from an individual crystal of a crystal aggregate.
Industry:Mining
A number of empty or loaded mine cars, coupled together, for transport by rope haulage or locomotive.
Industry:Mining
A number of loaded holes connected and fired one after the other. In contradistinction to simultaneous firing, where the charges are connected electrically, and are all exploded at one time.
Industry:Mining
A number of piles driven or cast in situ, will sustain a much heavier load than a single pile can carry, esp. when connected by a pile cap.
Industry:Mining
A number of small plows attached to a rope or chain which cut backward and forward on the face. They operate in conjuction with an armored conveyor.
Industry:Mining
A number, composed of three or four digits, that defines the position of an igneous rock in Johannsen's classification. The first digit represents the class, the second the order, and the third and fourth the family. Compare: Johannsen's classification
Industry:Mining
A numbered piece that a miner attaches to or places on each car a miner loads. The tag is removed at the tipple where the car is credited to the miner. Compare: wedge rock
Industry:Mining
A numerical expression of a duct's liability to leak. The National Coal Board of Great Britain defines this as the volume of air in cubic feet per minute that would leak from 1770 100 ft (30 m) of a ventilation duct under a uniform pressure of 1 in (2.54 cm) of water gage.
Industry:Mining
A numerical expression to indicate the relative swelling properties of a sample when heated under standardized conditions.
Industry:Mining
A numerical factor that measures the internal resistance of a fluid to flow; it equals the shearing force in dynes per square centimeter transmitted from one fluid to another that is 1 cm away, and generated by the difference in fluid velocities of 1 cm/s in the two planes. The greater the resistance to flow, the larger the coefficient.
Industry:Mining
