- 産業: 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 concentration of one or more elements in rock, soil, sediment, vegetation, or water that is markedly higher or lower than background. The term may also be applied to hydrocarbon concentrations in soils.
Industry:Mining
A concentration of oxygen in the atmosphere equal to or less than 19.5% by volume.
Industry:Mining
A concentration of pebbles coating a desert area. The pebbles are usually the residual product of wind erosion and are closely fitted together so as to cover the surface in the manner of a mosaic.
Industry:Mining
A concentration of pebbles coating a desert area. The pebbles are usually the residual product of wind erosion and are closely fitted together so as to cover the surface in the manner of a mosaic.
Industry:Mining
A concentration process based on selective wetting of minerals by oil in the presence of water and in the absence of air.
Industry:Mining
A concentrator of the Wilfley type in motion, but instead of using water, stratification is by means of rising currents of air. Heavy grains are pushed forward by the head motion, while lighter grains roll or flow down the slope toward the tailing side.
Industry:Mining
A concentric texture of ore minerals in which minute cracks have developed by shrinkage during crystallization of the original colloid.
Industry:Mining
A concept of the mechanism of isostasy, proposed by George Bedell Airy, that postulates an equilibrium of crustal blocks of the same density but of different thickness; thus the topographically higher mountains would be of the same density as other crustal blocks but would have greater mass and deeper roots. Compare: Pratt hypothesis.
Industry:Mining
A concept used in evaluating the size of fine particles by a sedimentation process; it is defined as the diameter of a sphere that has the same density and the same freefalling velocity in any given fluid as the particle in question. Compare: particle size.
Industry:Mining
A concept used in evaluating the size of fine particles by a sedimentation process; it is defined as the diameter of a sphere that has the same density and the same freefalling velocity in any given fluid as the particle in question. Compare: particle size.
Industry:Mining
