- 行业: Mining
- Number of terms: 33118
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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 ...
Air that contains the maximum possible amount of water vapor at that temperature. The amount of water vapor that will saturate a given volume of air increases with the temperature. Therefore, if saturated air is cooled, the excess water vapor condenses in the form of mist.
Industry:Mining
Air that has been rendered impure by the breath of workers and horses, or by being mixed with the various gases given off in mines. It is frequently called return air.
Industry:Mining
Air trapped in the bottom of a dry borehole by the rapid descent of a tight string of borehole equipment.
Industry:Mining
Air trapped in the bottom of a dry borehole by the rapid descent of a tight string of borehole equipment.
Industry:Mining
Air washers make use of water sprays or cooling coils for evaporative and sensible cooling of mine air. Their use has largely been limited to shallow coal mines in the United States, where it is desirable to reduce the dry-bulb temperature of the intake air during the hot summer months to prevent slaking of the roof due to excessive expansion. An air washer is essentially a heat exchanger and is similar to the type of unit employed for heat transfer with refrigeration or evaporative-cooling systems.
Industry:Mining
Alaska. Placers adjacent to the seashore to which the waves have access.
Industry:Mining
Alexandrite (chrysoberyl) of good gem quality from Tasmania, Australia.
Industry:Mining
