- 行业: 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 ...
One of 32 geometrically possible arrays of symmetry elements intersecting at a point. These symmetry elements are axes of rotation, both proper and improper (1 = i, 2 = m). All minerals having the symmetry of one point group belong to the same crystal class. Compare: symmetry; crystal class; space group.
Industry:Mining
One of a group of boreholes drilled in advance of mine workings to probe for and detect water-bearing fissures or structures.
Industry:Mining
One of a group of complex compounds formed by coordination of ammonia molecules with metal ions.
Industry:Mining
One of a group of elements (Group II) forming divalent cations; esp. calcium, strontium, and barium, but also includes beryllium, magnesium, and radium.
Industry:Mining
One of a group of organic compounds containing a carbon-to-carbon triple bond; e.g., acetylene, allylene. Also spelled alkine.
Industry:Mining
One of a pair of an endless chain of plates driven by sprockets and used instead of wheels, by certain power shovels, tractors, bulldozers, drilling machines, etc., as a means of propulsion. Also any machine mounted on such tracks.
Industry:Mining
One of a pair of rails used in a method of temporary rail-track advance at a tunnel face. The rails comprise a pair of specially made channels with ramp ends. They fit over the rail section in use and are pushed forward periodically as a power loader clears the rock ahead. The permanent track is extended as space becomes available.
Industry:Mining
One of a series of divergent small faults at the extremities of a major fault. Splays are typically associated with rifts.
Industry:Mining
One of a series of marks or lines placed on seismic records at precisely determined intervals of time (usually at intervals of 0.01 or 0.005 s) for the purpose of measuring the arrival time of recorded events.
Industry:Mining
