- 産業: 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 curb supporting the walling in a shaft and is itself supported on plugs or bolts driven into the ground around the shaft. The crib may be removed when the walling from below is carried up to it.
Industry:Mining
A current caused by differences in densities, for example, an excess of evaporation, cooling, or dilution in a restricted basin or an open sea.
Industry:Mining
A current in the surf zone, moving generally parallel to the shoreline, generated by waves breaking at an angle with the shoreline.
Industry:Mining
A current in the surf zone, moving generally parallel to the shoreline, generated by waves breaking at an angle with the shoreline.
Industry:Mining
A current, generally of water, that influenced sedimentation or other processes or conditions in the geologic past.
Industry:Mining
A curtain or screen of flexible material used to direct or control the flow of ventilating air.
Industry:Mining
A curve indicating, for each specific gravity (or size) fraction, the percentage that is contained in one of the products of the separation; e.g., the reject.
Industry:Mining
A curve indicating, for each specific gravity (or size) fraction, the percentage that is contained in one of the products of the separation; e.g., the reject.
Industry:Mining
