- 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 ...
Metamorphosed lamprophyre with a schistose structure containing brown biotite and green hornblende.
Industry:Mining
Metamorphosed oxide-facies iron formation characterized by a high percentage of strongly aligned flakes of specular hematite. Compare: itabirite
Industry:Mining
Meteorological and oceanographic data taken for a specific location, observed from a ship underway or at anchor.
Industry:Mining
Meter that indicates the relation of the phase between the line current and the line voltage, which actually is the same as the power factor of the load.
Industry:Mining
Method for extracting alumina from high-silica bauxites, in which the bauxite is first subjected to a Bayer process caustic leach. The resulting red mud, containing sodium aluminum silicate, is sintered with limestone plus soda ash and then leached with water to recover alumina and soda.
Industry:Mining
Method of analysis based on the intensity of fluorescence measured when using ultraviolet light.
Industry:Mining
Method of assessing the coking property of coal; 20 g is heated in a silica tube to 600 degrees C and the residual product is compared with a standard series ranging from noncoking (type A) to highly coking (G), all of which have the same volume as the original. Cokes that expand (swell) on coking receive a subscript indicating the degree of swelling.
Industry:Mining
Method of blasting, employing diamond drills or extension steel drills with tungsten carbide bits, applied to ore-winning operations where conditions are suitable. The essential requirements from the practical and economic points of view are (1) a large orebody or wide regular vein, (2) a strong country rock, and (3) a good parting between the ore and the rock to avoid undue contamination of the ore. Holes to take cartridges up to 2 in (5.1 cm) in diameter may be drilled. Since the drilling of long holes is relatively expensive, high-strength, high-density gelatinous explosives are usually employed so that the maximum burden can be placed on each hole. For this reason also, the largest diameter of explosive cartridge that can be loaded into the holes should be used to obtain the greatest possible loading density.
Industry:Mining
Method of carburizing the surface layers of low-carbon steel, followed by rapid chilling.
Industry:Mining
