- 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 separation size corresponding to 50% recovery as read from a size partition curve.
Industry:Mining
The separation, by any process, of crystals from a magma, or of one crystal phase from another during crystallization of the magma.
Industry:Mining
The sequence of events in which volcanic activity is followed by major plutonic intrusions, and then minor intrusions (e.g., dikes).
Industry:Mining
The sequence of minerals produced by reaction between liquid and crystals during crystallization of a complex magma. Bowen's reaction series has a continuous side (calcic to alkalic plagioclase) and a discontinuous side (olivine-pyroxene-amphibolebiotite).
Industry:Mining
The sequence of operations in crushing a material, including, e.g., the screening of the primary product and the recirculation of the screen overflow.
Industry:Mining
The sequence of operations in grinding a material, including, for example, the screening of the primary product and the recirculation of the screen overflow.
Industry:Mining
The sequence of stages in the migration of elements during geologic changes. Rankama and Sahama distinguish a major or endogenous cycle, proceeding from magma to igneous rocks to sediments to sedimentary rocks to metamorphic rocks and possibly through migmatites back to magma, and a minor or exogenic cycle proceeding from sediments to sedimentary rocks to weathered material and back to sediments again.
Industry:Mining
The sequential order of mineral deposition during formation of an ore deposit. Compare: paragenesis
Industry:Mining
The series of bands of variation in color or texture in a rock mass, or the course of the planes of such bands, as indicative of the course of the bedding plane when that is otherwise obscure.
Industry:Mining
The series of carefully woven, square-mesh wire screens most commonly used in the United States in screening ores.
Industry:Mining
