- 업종: 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 ...
A detonator with an integral delay element and capable of being initiated by miniaturized or regular detonating cord.
Industry:Mining
A detrital limestone composed wholly or chiefly of mechanically sorted fossil debris that experienced abrasion and transport before reaching the depositional site and that is weakly to moderately cemented, but not completely indurated; esp. a porous lightcolored limestone made up of loosely aggregated shells and shell fragments, such as the relatively recent deposits occurring in Florida and used for roadbeds and construction.
Industry:Mining
A developing heading driven to the dip, usually the full dip of the coal seam; worked by rope haulage.
Industry:Mining
A development heading off which oblique headings and conveyor panels are formed and worked (longwall); any of the development drivages in the solid coal, about 15 yd (13.7 m) apart, and of which bords and pillars are formed (pillar method of working).
Industry:Mining
A development in which a groove is cut around each end of a pipe instead of the usual threads. Two ends of pipe are then lined up and a rubber ring is fitted around the joint. A pair of semicircular bands, forming a sleeve, are placed around the ring and are drawn together with two bolts. These have a ridge on both edges that fits into the groove of the pipe. As they are tightened, the rubber ring is compressed, making a watertight joint, while the ridges fitting in the grooves make it strong mechanically. Victualic pipe is faster to lay because in large sizes it does not have to be aligned perfectly and screwed in.
Industry:Mining
A development level or drift, driven from the surface, in ironstone mining.
Industry:Mining
A deviation from ideal crystal structure about a point location; e.g., interstitial, atom missing (Schottky), or combined (Frenkel). Compare: crystal defect; Frenkel defect; Schottky defect.
Industry:Mining
A device across the path of a conveyor placed at the correct angle to deflect objects or discharge bulk material.
Industry:Mining
A device across the path of a conveyor placed at the correct angle to deflect objects or discharge bulk material.
Industry:Mining
A device attached to a belt conveyor to clean or remove dirt or coal dust from the belt surface. Rotary bristle brushes are sometimes used, driven either by gearing from the conveyor or by an independent high-speed motor. Another device consists of a short scraper conveyor with rubber-faced scrapers attached at intervals. The scraper belt is driven via a chain drive from the main conveyor drum.
Industry:Mining
