- 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 point along a conveyor, which may already be carrying a load, at which coal is delivered from another panel conveyor.
Industry:Mining
The point at which a borehole, crosscut, or other underground opening encounters an ore vein or deposit; also, the thickness of the ore-bearing deposit so traversed.
Industry:Mining
The point at which a charge of dynamite is exploded for the generation of seismic energy. In field practice, the shot point includes the hole and its immediately surrounding area.
Industry:Mining
The point at which the damping constant and the undamped frequency of a seismometer or seismograph are equal. After deflection, the moving mass approaches rest position without overswing and the motion is said to be aperiodic.
Industry:Mining
The point group with the highest symmetry of its crystal system. Compare: hemihedral; merohedral; crystallographic system.
Industry:Mining
The point of tangency common to two curves of different radii, the curves lying on the same side of the common tangent. Abbrev., P.C.C.
Industry:Mining
The point on a stress-strain curve at which the strain ceases to be proportional to the stress. Its position varies with the sensitivity of the extensometer used in measuring the strain.
Industry:Mining
