- 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 ...
Movement usually along a fault that occurs after a mineral has been deposited.
Industry:Mining
Multiple row blasting with holes 1 to 3 in (2.5 to 7.6 cm) in diameter in low-face quarries. Short-delay blasting is usually adopted using explosive factors similar to those of large diameter holes. With smaller diameter blastholes, the explosive charges can be brought up higher in the holes and so provide better breakage in blocky ground.
Industry:Mining
Multiple-hearth vertical furnace. Rabbles rotating on each circular horizontal hearth work the continuously fed material across alternately to the periphery and then, on the next hearth below, toward the center, so that it gravitates through either a central or a peripheral opening and is at the same time exposed to rising heat or air blown through rabble arms.
Industry:Mining
Multispectral data from satellite remote sensing imagery that provides landscape patterns reflecting geologic structures, types of rocks, and vegetation.
Industry:Mining
Myrmekitelike intergrowth of microcline and vermicular plagioclase.
Industry:Mining
Myrmekitelike intergrowth of predominant plagioclase and vermicular orthoclase. The wormlike forms of orthoclase are, as a rule, broader than those of quartz in the typical myrmekite.
Industry:Mining
N. of Eng. A built-up pillar of stone or other debris in a working place or heading to support the roof; e.g., "bigging the gob" means building a pack in a worked-out place.
Industry:Mining
N. of Eng. A continuous coal face served by gateways (in Durham about 12 yd or 11 m apart). A small group works in each gateway down which the coal is removed by tubs.
Industry:Mining
