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United States Bureau of Mines
行业: 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 ...
Yielding payable ore.
Industry:Mining
York and Lanc. Spherical ferruginous concretions. Compare: caballa ball.
Industry:Mining
York. A smooth plane of cleavage.
Industry:Mining
York. A system of working coal. First, the main levels are started on both sides of the shaft and carried toward the boundary. Second, the bord gates are worked in pairs to the rise and continued as far as the boundary, or to within a short distance of a range of upper levels and other bord gates. Lastly, the whole of the pillars and remaining coal are worked out downhill to within a few yards of the levels, and ultimately, all the coal between the levels is removed.
Industry:Mining
York. Crystalline mineral matter, often ankerite, occurring in the cleat cracks of coal.
Industry:Mining
York. Extracting the post or pillars; pillar robbing.
Industry:Mining
York. Hard, dry vein matter, poor in ore; in lead mines.
Industry:Mining
York. Headings driven in pairs generally to the rise, out of which banks or stalls are opened and worked.
Industry:Mining
York. Headings driven on the end or end-on.
Industry:Mining
York. Limestone in the Coralline Oolite. Compare: toad's-eye
Industry:Mining
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