- 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 ...
The renewal of any geologic process, such as the revival of a stream's erosive activity or the reactivation of a fissure.
Industry:Mining
The repeated twinning of three or more individuals according to the same twin law but with the twinning axes not parallel. Often simulates a higher order of symmetry than that of the untwinned crystal. Compare: polysynthetic twinning
Industry:Mining
The replacement of the original topsoil at an opencast site on completion of operations to allow the growing of crops.
Industry:Mining
The replacement or alteration of feldspars to form clay minerals, esp. in wall rocks adjacent to mineral veins. Compare: kaolinization
Industry:Mining
The replacement, esp. of plagioclase in basalts and gabbros, by a fine-grained aggregate of zoisite, epidote, albite, calcite, sericite, and zeolites. It is a metamorphic or deuteric process and is frequently accompanied by chloritization of the ferromagnesian minerals.
Industry:Mining
The rescuing of miners overcome by a mine fire, or trapped in workings by an explosion, necessitates the use of apparatus that will enable the rescue team to work in irrespirable or poisonous gases. The equipment used is known as mine rescue apparatus.
Industry:Mining
The reserves in coal seams that are believed to be workable with regard to thickness and depth. In most cases, a maximum depth of about 4,000 ft (1.2 km) is taken, and a minimum thickness of about 2 ft (0.6 m). The minimum economic thickness varies according to quality and workability.
Industry:Mining
The reservoir formed by a spoil dam in which the returns from a borehole collect and are retained. Compare: sludge pit; sump.
Industry:Mining
