- Industry: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
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 platform or landing at the top of a shaft. The upper brace is the platform built in the headgear above the shaft collar.
Industry:Mining
A platform resting on stulls in a stope as a stage for miners or for holding rock or mineral.
Industry:Mining
A platform superimposed upon or forming part of the rail track that is free to roll or slide sideways so that a car can be moved bodily from one track to another parallel to it.
Industry:Mining
A plication of an underlying stratum, believed to result from unequal pressure and settling of overlying material.
Industry:Mining
A plot of mean absolute difference of paired sample measurements as a function of distance and direction. Madograms are not true variograms, and generally should not be used in kriging. If used, the kriged estimates might be "reasonable," but the kriging standard deviations will be meaningless.
Industry:Mining
A plot of the variance (one-half the mean squared difference) of paired sample measurements as a function of the distance (and optionally of the direction) between samples. Typically, all possible sample pairs are examined, and grouped into classes (lags) of approx. equal distance and direction. Variograms provide a means of quantifying the commonly observed relationship that samples close together will tend to have more similar values than samples far apart.
Industry:Mining
A plotting of cumulative cuts and fills used for engineering computation of highway jobs.
Industry:Mining
A plow consisting of a 2-in (5.1-cm) steel plate 6 ft by 20 in (1.8 m by 50.8 cm) of seven pieces hinged together to follow floor rolls; picks on the face edge cut in both directions. The minimum workable seam is 14 in (35.6 cm) on gradients of 35 degrees to 70 degrees . Maximum face length is 80 yd (73.2 m). The machine is used in the Ruhr.
Industry:Mining
A plow designed for the extraction of coal pillars and for short, rapidly advancing development faces. The plow is guided along a panzer conveyor, but the pulling forces are not transmitted to the conveyor structure. The plow is automatically advanced at each end of its short run, giving a rapid face advance. This requires the use of self-advancing supports in conjunction with hydraulic anchorages.
Industry:Mining
