- 行业: 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 ...
The seven large divisions into which all crystallizing substances can be placed, namely isometric (or cubic), tetragonal, hexagonal, trigonal, orthorhombic (or rhombic), monoclinic, and triclinic. This classification is based on the degree of symmetry displayed by the crystals.
Industry:Mining
The shaft from the surface in which the first stage of hoisting is carried out.
Industry:Mining
The shaft in the tail or foot section of a belt or chain conveyor that supports either the tail pulley or the tail sprocket.
Industry:Mining
The shaft mounted at the delivery end of a chain conveyor, on which is mounted a sprocket that drives the drag chain. The shaft, in turn, is driven by means of a drive chain from the speed reducer of the power unit through a sprocket mounted on the shaft end.
Industry:Mining
The shaft that extends a mine downward from the bottom of the secondary shaft.
Industry:Mining
The shaft that extends a mine downwards from the bottom of the primary shaft but not in line with the primary shaft.
Industry:Mining
The shafts, tunnels, laterals, crosscuts, and staple pits to prove and render accessible the coal or ore to be extracted.
Industry:Mining
