- 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 condition in which an entry or room is left after all the coal has been removed.
Industry:Mining
The condition of dynamite when subjected to a low temperature not sufficient to congeal it, but which seriously affects the strength of the dynamite.
Industry:Mining
The condition of equilibrium, comparable to floating, of the units of the lithosphere above the asthenosphere. Crustal loading, as by ice, water, sediments, or volcanic flows, leads to isostatic depression or downwarping; removal of load leads to isostatic uplift or upwarping. Two differing concepts of the mechanism of isostasy are the Airy hypothesis of constant density and the Pratt hypothesis of constant thickness.
Industry:Mining
The conditions under which coal was formed. Decay under water in swamps.
Industry:Mining
The conducting wires through which an electric current is conveyed to points in and about a mine, where it is required for lighting or motive power.
Industry:Mining
The configuration of the crown or cutting face of a bit as seen in cross section.
Industry:Mining
The constant maximum detonation velocity achieved by an explosive charge of a given diameter, mixture and density; it is the velocity at which a detonation will sustain itself through a column of explosive.
Industry:Mining
The constant or regular flow of water in a mine proceeding from old workings or from water-bearing rocks.
Industry:Mining
The constant velocity acquired by a particle falling in water or air when the frictional resistance is equal to the gravitational pull.
Industry:Mining
The constant, gamma , in the law of universal gravitation. Its value is 6.672 X 10<sub>-11</sub>m<sub>3</sub>/kg X s<sub>2</sub>.
Industry:Mining
