- المجال: 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 ...
A shaft support consisting of H-beams, I-beams, angles, and sheeting. The design is somewhat similar to that used for timber. Bolts, rivets, and fastening angles are used to connect and secure the steel members. The fastening angles are riveted to the beams. The addition of galvanized-iron corrugated wall sheets (or laggings) form a secure and fireproof shaft.
Industry:Mining
A shaft through which coal, ore, water, etc., are raised from a mine by means of a whim.
Industry:Mining
A shaft used wholly or mainly for ventilating mines, for bringing fresh air to places where miners are working, or for exhausting used air. It may be used as an intake (downcast) shaft or a return (upcast) shaft.
Industry:Mining