- Branża: Mining
- Number of terms: 33118
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- 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 coal or mineral washer for relatively coarse material. The broken ore, supported on a screen, is pulsed vertically in water; the heavy (valuable) portion passes through the screen into a conical receptacle (hutch), and the gangue goes over the side. In coal washing, the heavy (worthless) shale passes downwards, and the lighter coal remains on top.
Industry:Mining
A coal pillar design formula that predicts the strength of coal pillars based on a survey of failed and standing coal pillars in South Africa. The coal pillar strength is predicted from coal pillar height and width specifications combined with empirical constants developed from fitting the design equation to 125 case studies.
Industry:Mining
A coal pillar design formula that predicts the strength of coal pillars based on laboratory tests of coal cube strength combined with pillar height and width specifications. The Holland-Gaddy formula is generally considered to be overly conservative for large pillar width-to-height ratios (over 5).
Industry:Mining
A coal seam intersected by a fault or where its continuity is excessively broken.
Industry:Mining
A coal seam or orebody of such thickness, grade, and depth as to make it a good prospect for development. In remote and isolated locations, other factors influence minability, such as access, water supply, transport facilities, etc.
Industry:Mining
A coal seam structure sometimes observed along the fringe of a washout. It was probably produced by the water forcing open layers of the coaly mass and the injection of fine sand or silt into the splayed partings--the veins of coal branching out like a fishtail.
Industry:Mining
A coal seam that has separated into two layers of coal some distance apart vertically.
Industry:Mining
