- 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 ...
A break in the drill core caused by an accumulation of chips at the bit face. When drilling is stopped to rechuck, these chips grip the core, and the core is twisted and broken. Compare: torsion fracture.
Industry:Mining
A breakdown product of xanthate collectors (flotation agents) with some residual value for that purpose.
Industry:Mining
A breaker developed as the mechanical equivalent of the miner's pick. In the modern type, the picks are mounted on alternating arms, the primary and secondary picks being at different spacings so that breaking is performed in two stages. The breaker and plate belt are usually supplied as a standard unit driven from a common motor.
Industry:Mining
A breaker where the coal from a number of mines in a district is prepared. Central breakers, representing the last word in mining technology, make it economical for operators to abandon many local breakers.
Industry:Mining
A breaking machine for coal, rock, or minerals. It consists of a trommel screen with a heavy cast steel shell fitted internally with lifts that progressively raise and convey the coal and stone forward and break it. As the material is broken the undersize passes through the apertures, so that excessive degradation does not occur.
Industry:Mining
A breccia around an igneous intrusion, caused by wall-rock fragmentation and consisting of both intrusive material and wall rock; intrusion breccia. Compare: agmatite.
Industry:Mining
A breccia formed as a result of crustal movements, usually developed from brittle rocks. Compare: fault breccia; fold breccia; crush breccia.
Industry:Mining
A breccia formed by the collapse of rock overlying an opening, as by foundering of the roof of a cave or of the roof of country rock above an intrusion; e.g., a solution breccia.
Industry:Mining
A breccia formed by the collapse of rock overlying an opening, as by foundering of the roof of a cave or of the roof of country rock above an intrusion; e.g., a solution breccia.
Industry:Mining
