- 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 ...
The tests are of two main types, namely: (1) mechanical analysis, performed by sieving or sedimentation, to determine the size-distribution of the constituent particles; and (2) index property tests, for soils passing a 36-mesh British Standard sieve, by means of which the type is deduced from the moisture content at standard consistencies.
Industry:Mining
The texture of a sedimentary rock consisting largely of ooliths showing tangential contacts with one another.
Industry:Mining
The texture of metamorphic rocks resulting from the development during recrystallization of minerals with a fibrous habit.
Industry:Mining
The theoretical amount of extractable aluminum oxide, Al<sub>2</sub>O<sub>3</sub>, present in a bauxite. The amount of alumina in a bauxite that is present in a form that allows it to be extracted by a refining plant.
Industry:Mining
The theory of the origin of coal that holds that a coal was formed at the place where the plants from which it was derived grew.
Industry:Mining
The theory that the contents of a vein or lode are derived from the adjacent country rock by a leaching process, in which either superficial water or thermal water is involved.
Industry:Mining
The theory that there were progressive stages in the conversion of vegetable matter into the various grades of coal of the Carboniferous system. Thus, peat forms at an early stage in coal formation and lignite at an intermediate stage, and by further compression and alteration, bituminous and anthracite coals were formed.
Industry:Mining
The theory, advocated by A. G. Werner in the 18th century, that the rocks of the Earth's crust all consist of material deposited sequentially from, or crystallized out of, water. Etymol: Neptune, Roman god of waters. Compare: plutonism
Industry:Mining
The theory, first propounded about 1840 and now universally accepted, that the drift was deposited through the agency of glaciers and ice sheets moving slowly from higher to lower latitudes during the Pleistocene Epoch.
Industry:Mining
