- Industry: 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 ...
In mine fan terminology, the angle made by the direction of air approach and the chord of the aerofoil section.
Industry:Mining
In mine subsidence, an inward movement from the side, resulting in a pull or draw beyond the edges of the workings.
Industry:Mining
In mine subsidence, a movement from the sides, the material sliding inward, and following the main break, assumed to be at right angles to the plane of the seam. The amount of this movement depends on several factors, such as the dip, depth of seam, and nature of overlying materials.
Industry:Mining
In mine subsidence, that portion of the mined strata which, being still in the process of sinking, goes far to furnish the motive power producing the phenomena.
Industry:Mining
In mine subsidence, the break that occurs over the seam at an angle from the vertical equal to half the dip.
Industry:Mining
In mine subsidence, the mined area multiplied by the mean thickness of the bed, or of that part of the bed that has been extracted.
Industry:Mining
In mine subsidence, the zone that embraces the disturbed strata lying round about and outside the mined strata.
Industry:Mining
In mine subsidence, the powerful thrust or pressure, generally 20 to 40 ft (6 to 12 m) from the face, that causes distance from the roof to the floor to diminish rapidly and for packwalls to become compressed or pushed down into a soft bottom. Timber legs or metal supports (if any) in the gates are generally broken or twisted.
Industry:Mining
In mine valuation and process control, devices that cut a representative fraction from a pile of ore or from a passing stream.
Industry:Mining
