- 行业: 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 method of dressing stones either with a pick or with pick-shaped chisels.
Industry:Mining
A method of drilling a hole just beyond the center of a boulder to be broken so that the charge is centrally situated. Stemming is used. Pop-shooting is economical in explosives, but drilling is required. It is somewhat difficult to control the throw of broken material, but there is little noise to cause annoyance to nearby property owners.
Industry:Mining
A method of drilling in which repeated blows are applied to the bit, which is continually rotated under power.
Industry:Mining
A method of drilling, now largely replaced by rotary drilling, in which the rock at the bottom of the hole is broken up by a steel bit with a blunt, chisel-shaped cutting edge. The bit is at the bottom of a heavy string of steel tools suspended on a cable that is activated by a walking beam, the bit chipping the rock by regularly repeated blows. The method is adapted to drilling water wells and relatively shallow oil wells.
Industry:Mining
A method of driving used for adits, tunnels, and drifts. The upper part or top heading is driven to the full length, before the enlargement of the rest of the section is carried out.
Industry:Mining
A method of dust prevention in which water is delivered onto a moving cutter chain, through water pipes, and is carried into the cut where it is intimately mixed with the cuttings. This method is successful in seams up to 4 ft (1.22 m) thick.
Industry:Mining
A method of dust prevention used in hand-won faces, or in conjunction with wet cutting in thick seams. The sprays are controlled by the colliers who wet the face and the broken coal before loading. Sprays must be connected with the pipeline through the face by means of flexible hoses; one spray for every 20 yd (18.3 m) of face is usually sufficient.
Industry:Mining
A method of dust suppression in which thick foam is forced through the drill by means of compressed air and the foam and dust mixture emerges from the mouth of the hole in the form of a thick sludge. With this method the amount of dust dispersed into the atmosphere is almost negligible and the amount of water used is about 1 gal/h (3.8 L/h). Approx. 30 to 50 ft (9 to 15 m) of drilling can be done with one filling of the unit.
Industry:Mining
A method of effecting extinction of mine fires using water or the effluent of chemical fire extinguishers. When a mine fire is readily accessible to the firefighting personnel, extinction of it may be achieved by direct application of some substance that will cool down the hot mass below its ignition temperature, or, in the case of oils, will arrest the volatilization process by sealing or emulsifying the oil surface.
Industry:Mining
A method of electrical prospecting based on the measurement of natural earth potentials caused by the self-potential effects from orebodies, commonly metallic sulfides.
Industry:Mining
