- 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 ...
Said of a fan with an orifice comparable to the equivalent orifice of a mine; i.e., the area in a thin plate that requires the same pressure to force a given volume of air through as is required to force the same volume through the fan. Orifice of passage O = 0.389 Q/w.g.f., where Q = volume of air passing in thousands cubic feet per minute; w.g.f.= loss of pressure in the fan in inches of water gage.
Industry:Mining
Said of a firm carbonate rock formed by an intergrowth of frame-building corals and algae (esp. coralline algae). The material so formed is an excellent sediment binder in a coral reef.
Industry:Mining
Said of a formerly glacier-covered land surface, esp. one that has been modified by the action of a glacier or an ice sheet, as a glaciated rock knob.
Industry:Mining
Said of a geologic process or event occurring during a period of orogenic activity; or said of a rock or feature so formed. Compare: syntectonic
Industry:Mining
Said of a hydrothermal mineral deposit at an intermediate distance from its magmatic source. The term is little used. Compare: telemagmatic; cryptomagmatic.
Industry:Mining
Said of a hydrothermal mineral deposit formed at considerable depth and in the temperature range of 200 to 300 degrees C. Also, said of that environment. Compare: hypothermal deposit; epithermal; leptothermal; telethermal; xenothermal.
Industry:Mining
Said of a hydrothermal mineral deposit formed at high temperature but shallow depth; also, said of that environment. Compare: telethermal; epithermal; mesothermal; hypothermal deposit; leptothermal.
Industry:Mining
Said of a hydrothermal mineral deposit formed at high temperatures and pressures. Compare: epithermal; hydrothermal deposit; leptothermal; mesothermal; telethermal; xenothermal.
Industry:Mining
Said of a hydrothermal mineral deposit formed at shallow depth and relatively low temperatures, with little or no wall-rock alteration, presumably far from the source of hydrothermal solutions. Also, said of that environment.
Industry:Mining
