- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
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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 coal maceral group including micrinite, macrinite, sclerotinite, fusinite, semifusinite, and inertodetrinite. They are characterized by a relatively high carbon content and a reflectance higher than that of vitrinite. They are relatively inert during the carbonization process.
Industry:Mining
A coal maceral group including micrinite, macrinite, sclerotinite, fusinite, semifusinite, and inertodetrinite. They are characterized by a relatively high carbon content and a reflectance higher than that of vitrinite. They are relatively inert during the carbonization process.
Industry:Mining
A coal microlithotype group that contains vitrinite macerals totalling at least 95%. Compare: liptite; vitrain.
Industry:Mining
A coal microlithotype that contains a combination of vitrinite and exinite totalling at least 95%. The proportions of these two macerals may vary widely, but each must be greater than the proportion of inertinite, and neither must exceed 95%. Distinction may be made between spore clarite, cuticular clarite, and resinous clarite. Clarite is widely distributed and very common, particularly in clarain-type coals and occurs in fairly thick bands. Compare: clarain.
Industry:Mining
A coal microlithotype that contains a combination of vitrinite and inertinite totalling at least 95%, and containing more of each than of exinite. It generally occurs in highranking bituminous coals.
Industry:Mining
A coal mining machine of the type that cuts the face of the coal without being withdrawn from the cut.
Industry:Mining
A coal mining term indicating a weak roof. Bad top sometimes develops following a blast.
Industry:Mining
A coal mining term used when feeders or blowers act as the means by which gas is "bled off" or dissipated to the adjoining strata or to the surface.
Industry:Mining
