- 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 mine in hard rock; esp. one difficult to drill, blast, and square up.
Industry:Mining
A mine in which the material being mined is incombustible or contains at least 65% by weight of incombustible material, and in which the underground atmosphere in any open workings contains less than 0.25% by volume of flammable gas.
Industry:Mining
A mine is said to be gassy when it gives off methane or other gas in quantities that must be diluted with pure air to prevent occurrence of explosive mixtures.
Industry:Mining
A mine locomotive driven by compressed air. It is very safe and is much used in gassy mines in Europe. The air is brought down by pipeline from the surface to a charging station near the pit bottom.
Industry:Mining
A mine locomotive that can operate as a trolley locomotive or as a battery locomotive. While operating on a battery, it can be used, under certain conditions, at the coal face. Also it may be used on the main haulage trolley system where, due to higher voltage, higher speeds are possible.
Industry:Mining
