- 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 sizes by which anthracite coal is marketed. The sizes are called broken, egg, stove, chestnut, pea, and buckwheat. Size is graded according to the size of round mesh a piece will pass through.
Industry:Mining
The slag within a furnace escaping through the brickwork; caused by erosion, corrosion, or softening of brick by heat.
Industry:Mining
The slice or thickness of coal taken by a cutter loader when cutting along the face. The thickness of a web varies from a few inches with plow-type machines to up to about 6 ft (1.8 m) with the A.B. Meco-Moore. The term web tends to be restricted to thin or medium slices of coal.
Industry:Mining
The slight flexing or bending of the Earth's crust on a broad or regional scale, either upward (upwarping) or downward (downwarping); the formation of a warp.
Industry:Mining
The slipping of sedimentary strata along bedding planes during folding.
Industry:Mining
The slope beyond which the material on a conveyor tends to roll downhill. The maximum slope on which a conveyor can operate depends on (1) the material carried, (2) the loading or feeding efficiency, (3) the size and type of belt, and (4) the environment. In general, in the case of run-of-mine coal and ore, belt conveyors can operate up to about 18 degrees . If the material conveyed contains large lumps, spillage may result if the belt is too narrow.
Industry:Mining
The slope, measured in degrees of deviation from the horizontal, on which loose or fragmented solid materials will start to slide; it is a slightly greater angle than the angle of rest.
Industry:Mining
The slow and gradual withdrawal of the water in the sea, a lake, or a stream, leaving the former bottom as permanently exposed and uncovered dry land; it does not include seasonal fluctuations in water levels. Legally, the added land belongs to the owner of the adjacent land against which it abuts. Also, the land left uncovered by reliction.
Industry:Mining
The slow disintegration of coal into fires in surface stockpiles under the action of the weather, particularly frost after a wet period.
Industry:Mining
