- المجال: 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 ...
A mining system used either underground or in surface pits whereby a thick ore or waste zone is removed by blasting a series of successive horizontal layers called benches.
Industry:Mining
A mining system, brought on by the advent of mechanical loading and mechanical coal cleaning, in which the entire section is dislodged together and the coal separated from the rock outside of the mine by the cleaning plant.
Industry:Mining
A mining term for hydrogen sulfide. The gas has an unpleasant smell, resembling that of rotten eggs, hence the name. The presence of this gas may indicate a gob fire in its early stages. Produced by the distintegration of iron pyrites.
Industry:Mining
A mining term for the mixtures of sylvite and halite occurring in the Prussian salt deposits; mined as potassium ore.
Industry:Mining
A mining title on which exemption from otherwise essential activity has been granted.
Industry:Mining
A minor fold that is the result of the flowage of rocks toward a synclinal axis, toward which the minor folds are overturned.
Industry:Mining
A minor fold, usually one of a series, formed in an incompetent bed lying between more competent beds, produced by movement of the competent beds in opposite directions relative to one another. Drag folds may also develop beneath a thrust sheet. They are usually a centimeter to a few meters in size.
Industry:Mining
A minute crustacean with a bean-shaped bivalve shell completely enclosing the body.
Industry:Mining
A misnomer for chalcedony stained green with chromic oxide. It is a deeper green than nickel-stained chalcedony and, unlike the nickel types, shows a red residual color under the dichromatic filter.
Industry:Mining
