- Industry: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
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 ...
Derb. A road in a coal mine, supported by brattices built on each side after the coal has been worked out.
Industry:Mining
Fracture formed in a roof bed as a result of mining operations. For example, on longwall faces fractures are formed in a shale roof parallel to and along successive lines of face. They are induced after coal cutting and become intensified at the end of the loading shift. The distance between the fractures coincides, roughly, with the depth of cut.
Industry:Mining
Deliberate plugging of a borehole at a point some distance above the bottom by introduction of some type of foreign material or a plug.
Industry:Mining
Pneumatic flotation machine consisting of a long tank with V-shaped base into which pipes connected with a low-pressure source deliver compressed air. Internal baffles provide an air lift and the cell discharges a mineralized froth along one or both sides, the tailing leaving at the far end. The Britannia cell is a modified form.
Industry:Mining
Ground movement, perhaps violent, due to failure under stress of ground surrounding underground workings usually in coal, so named because of sound produced.
Industry:Mining
Cross-steel or timber piece in a circular or rectangular shaft. Such pieces serve to divide the shaft into compartments and may also carry the cage guides, etc.
Industry:Mining
