- 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 ...
A consolidated sedimentary rock composed principally of broken fragments that are derived from preexisting rocks (of any origin) or from the solid products formed during chemical weathering of such rocks, and that have been transported mechanically to their places of deposition; e.g., a sandstone, conglomerate, or shale; or a limestone consisting of particles derived from a preexisting limestone.
Industry:Mining
A consolidated sedimentary rock composed principally of broken fragments that are derived from preexisting rocks (of any origin) or from the solid products formed during chemical weathering of such rocks, and that have been transported mechanically to their places of deposition; e.g., a sandstone, conglomerate, or shale; or a limestone consisting of particles derived from a preexisting limestone.
Industry:Mining
A consolidated sedimentary rock composed principally of broken fragments that are derived from preexisting rocks (of any origin) or from the solid products formed during chemical weathering of such rocks, and that have been transported mechanically to their places of deposition; e.g., a sandstone, conglomerate, or shale; or a limestone consisting of particles derived from a preexisting limestone.
Industry:Mining
A consolidated sedimentary rock consisting of clastic material deposited by the wind; e.g., dune sand cemented below ground-water level by calcite.
Industry:Mining
A constant variance model most often used in combination with one or more other functions when fitting mathematical models to experimental variograms.
Industry:Mining
A constituent intermediate between vitrinite and fusinite showing a well-defined structure of wood and sclerenchyma. The cell cavities, either round, oval, or elongated in cross section, vary in size but are generally smaller and sometimes less well defined than those of fusinite. Occurs as lenses and bands of variable thickness, and as small fragments; associated with fusinite, or included in vitrite, clarite, duroclarite, clarodurite, and durite. It often lies as a transition material between vitrinite and fusinite, and the properties lie between those of fusinite and vitrinite; behaves as a semi-inert diluent in carbonization.
Industry:Mining
A constituent of a metamorphic rock which, in the new rock, has not changed its original crystal outlines.
Industry:Mining
A constituent of alloys that is formed when atoms of an element B are incorporated in the crystals of a metal A. In most cases, solution involves the substitution of B atoms for 2460 some A atoms in the crystal structure of A, but there are cases in which the B atoms are situated in the interstices between the A atoms.
Industry:Mining
A constituent of alloys that is formed when atoms of two metals combine in certain proportions to form crystals with a different structure from that of either of the metals. The proportions of the two kinds of atoms may be indicated by formula, e.g., CuZn; hence, these constituents are also known as intermetallic compounds.
Industry:Mining
A constituent of portland cement clinker. Also spelled felith. See: belite; larnite.
Industry:Mining
