- Industry: 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 ...
Said of conditions and processes, or of features and deposits, that exist or are situated in or under water, esp. freshwater, as in a lake or stream. Compare: subaerial
Industry:Mining
Said of conditions and processes, such as erosion, that exist or operate in the open air on or immediately adjacent to the land surface; or of features and materials, such as eolian deposits, that are formed or situated on the land surface. The term is sometimes considered to include fluvial. Compare: subaqueous; subterranean.
Industry:Mining
Said of crystal structures in which the atoms are only slightly displaced from positions that would be in accord with a higher symmetry. Thus, a monoclinic, pseudotetragonal mineral contains atoms only slightly displaced from positions of tetragonal symmetry.
Industry:Mining
Said of deposits and coal seams with a dip of 25 degrees to 40 degrees .
Industry:Mining
Said of deposits and coal seams with a dip of from 5 degrees to 25 degrees.
Industry:Mining
Said of deposits laid down on the landward side of a coast, in shallow fresh water subject to marine invasions. Thus, marine and nonmarine sediments are interbedded; as exemplified in the lower part of the Coal Measures, the nonmarine (paralic) predominate, with relatively thin marine bands. Compare: limnic
Industry:Mining
Said of disseminated ores, esp. with dark grains in a light matrix.
Industry:Mining
Said of geologic features that are in an overlapping or staggered arrangement, e.g., faults. Each is relatively short, but collectively they form a linear zone, in which the strike of the individual features is oblique to that of the zone as a whole. Etymol: French en echelon, in steplike arrangement.
Industry:Mining
Said of igneous rock that has been erupted onto the surface of the Earth. Extrusive rocks include lava flows and pyroclastic material such as volcanic ash. An extrusive rock. Compare: intrusive volcanic; eruptive.
Industry:Mining
