- 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 ...
In statistics, the technical name describing peakedness of a frequency distribution. It is statistically measured as the coefficient of quartile kurtosis.
Industry:Mining
In stonework industry, one who grinds the cutting tools for stoneworking planers and lathes to a keen edge of the desired shape.
Industry:Mining
In stoneworking, a quarryman whose function is to split off large portions of rock by means of a jump drill and wedges.
Industry:Mining
In stoping, the ring stresses around a level, rise, or winze are so increased by the influence of an approaching stope face that at some point on the periphery the rock fails. The stress ring is broken, and the rock of sides, back, and bottom released thereby expands suddenly and violently into the excavation, causing a rock burst. This rock burst is identical in type with those occurring in development. It is usually extremely local in effect, though a heavy earth tremor is caused.
Industry:Mining
In strata control, describes an area where the force is concentrated on pillars. This type of area is said to be overstressed or superstressed. This superstressing is limited by the strength of the seam or pillar. Compare: destressed area
Industry:Mining
In strip mining, a haulage system in which the empty units enter the mine over one lateral and leave, loaded, over the lateral nearest the tipple. This system is utilized where laterals are built into the mine from the main road, whether outside the outcrop or on the high-wall side of the mine workings. This system reduces the haul on the coal surface to a minimum, except where there are only two laterals, one at each end of the workings.
Industry:Mining
In strip mining, the use of two types of haulage at the same mine for transporting coal from the face to the preparation plant. Usually, coal is transported from the loading shovel to a transfer station by motorized units, and rail haulage is used to haul the coal from this point to the preparation plant.
Industry:Mining
In stripping operations, an area encompassing the pay material, its bottom depth, the thickness of the layer of waste, the slope of the natural ground surface, and the steepness of the safe slope of cuts.
Industry:Mining
In stripping, a pit that follows a straight line when projected on a horizontal plane.
Industry:Mining
