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United States Bureau of Mines
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 ...
The velocity pressure corresponding to the average velocity at the fan outlet.
Industry:Mining
The velocity with which a seismic-signal wavefront appears to travel along the surface of the Earth. It exceeds the actual velocity if the wave train is not traveling parallel to the surface.
Industry:Mining
The velocity with which the explosion wave travels through the column of charge.
Industry:Mining
The ventilation of a sinking shaft is by means of auxiliary fans. Axial flow fans powered by flameproof motors are commonly used.
Industry:Mining
The ventilation of a tunnel face (or mine) by an exhaust fan.
Industry:Mining
The ventilation produced in a mine as a result of a difference in density of the air in the upcast and downcast shafts, brought about by natural causes. Natural ventilation is feeble, seasonal, and inconstant.
Industry:Mining
The vertical component of the magnetic field; usually considered positive if downward, negative if upward. Compare: horizontal intensity
Industry:Mining
The vertical distance from the surface of the Earth to a stratum.
Industry:Mining
The vertical distance from the top of a bench to the floor or to the top of the next lower bench.
Industry:Mining
The vertical height of a bank as measured between its highest point or crest and its toe at the digging level or bench. Compare: berm bench height; digging height.
Industry:Mining
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