- 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 ...
A projecting ledge of rock, left in a shaft as footing for a ladder or to support pitwork.
Industry:Mining
A prominent isolated residual knob, hill, or small mountain rising abruptly from an extensive erosion surface in a hot, dry region (as in the deserts of southern Africa or Arabia), generally bare and rocky, although partly buried by the debris derived from its slopes. Etymol: German Inselberg, island mountain. Compare: monadnock
Industry:Mining
A prop consisting of two telescoping steel cylinders that are extended by hydraulic pressure that may be provided by a hand-operated pump built into the prop. The prop holds about half a gallon of mineral oil and is fitted with a yield valve that relieves the pressure when the load exceeds that for which the prop is set. A hydraulic prop enables quicker setting and uniform initial loading, and it can be withdrawn from a remote, safe position. The hydraulic prop was first used in a British coal mine in 1947.
Industry:Mining
A prop that is in effect a self-contained hydraulic jack consisting of two tubes, the upper one telescoping into the lower. The upper (or inner) tube acts both as a reservoir for the oil and as a container for the pump, yield valve, and other accessories.
Industry:Mining
A property of certain transparent substances that enables the presence of strain to be detected by examination in polarized light. If models of complicated engineering structures are made of such a substance, the stress distribution in the structure may be resolved.
Industry:Mining
A proponent of the theory that all granites had a metasomatic or palingenic origin. Compare: magmatist
Industry:Mining
A proportion of income derived from mining or oil production that is considered to be a return of capital not subject to income tax.
Industry:Mining
A proposed arrangement by which uranium owned privately could be enriched in uranium-235 content in U.S. Government facilities upon the payment of a service charge.
Industry:Mining
