- 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 coal mining, voltage from 661 to 1,000 V. Compare: high voltage; low voltage.
Industry:Mining
In igneous rock, a fanlike pattern of cross joints that follow the arching of the flow lineation.
Industry:Mining
In coal mining; during roof bolting process, vertical posts are installed tight with wedges near the area where the next roof bolt will be installed. These are installed by reaching from a bolted area of the roof. Installed to support potentially loose roof to prevent fall onto persons.
Industry:Mining
In coal preparation, optional-flow setups are those where coal usually goes to the plant but can be diverted into storage, either in bins or hoppers or on the ground.
Industry:Mining
In coal preparation, the jig box in which feed is stratified and separated into fractions (heavier below and lighter above). A feldspar washbox has a bedding of that mineral.
Industry:Mining
In coal sampling, a lack of symmetry in the particle-size distribution. It is a tendency of the observed data to extend farther to one side of the average than to the other.
Industry:Mining
In coal testing, a parameter, B, applied to the ash curve: B = (p75 - p25)/2(p50 - 1), where pX is the specific gravity of particles of which the fraction separated is X percent, (p75 - p25) is the statistical intermediate or inquartile range, and p50 is the effective 287 density of separation in a process in which a dense medium, vertical current, or jigging action is used. Equation is used to define shape of a Tromp curve.
Industry:Mining
In coal, amorphous brown to black substances formed by natural decomposition from vegetable substances; insoluble in alkali carbonates, water, and benzol.
Industry:Mining
In coal, primarily the vascular tissues of the axis of a vascular plant. It consists of two parts: the xylem that carries water from the roots, and the phloem that carries the food.
Industry:Mining
