- المجال: 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 feeder placed under a bin, hopper, or ore pass opening (or raise) that vibrates by the use of magnetic force to distribute ore evenly onto a moving conveyor belt. It can by adjusted to regulate the flow through various degrees of vibration.
Industry:Mining
A feeder that uses magnetized, power-operated rolls for separating and delivering objects.
Industry:Mining
A feeding arrangement in which the potential rate of supplying material at the feed point exceeds the rate at which the conveyor will remove material.
Industry:Mining
A feldspar-rich sandstone, typically coarse-grained and pink or reddish, that is composed of angular to subangular grains that may be either poorly or moderately well sorted; 165 usually derived from the rapid disintegration of granite or granitic rocks, and often closely resembles granite; e.g., the Triassic arkoses of the Eastern United States. Quartz is usually the dominant mineral, with feldspar (chiefly microcline) constituting at least 25%. Cement (silica or calcite) is commonly rare, and matrix material (usually less than 15%) includes clay minerals (esp. kaolinite), mica, and iron oxide; fine-grained rock fragments are often present. Arkose is commonly a current-deposited sandstone of continental origin, occurring as a thick, wedge-shaped mass of limited geographic extent (as in a fault trough or a rapidly subsiding basin); it may be strongly cross-bedded and associated with coarse granite-bearing conglomerate, and it may denote an environment of high relief and vigorous erosion of strongly uplifted granitic rocks in which the feldspar was not subjected to prolonged weathering or transport before burial. Arkose may also occur at the base of a sedimentary series as a thin blanketlike residuum derived from and resting on granitic rock. Etymol: French, probably from Greek archaios, ancient, primitive. Also spelled arcose.
Industry:Mining
A feldspar-rich sandstone, typically coarse-grained and pink or reddish, that is composed of angular to subangular grains that may be either poorly or moderately well sorted; 165 usually derived from the rapid disintegration of granite or granitic rocks, and often closely resembles granite; e.g., the Triassic arkoses of the Eastern United States. Quartz is usually the dominant mineral, with feldspar (chiefly microcline) constituting at least 25%. Cement (silica or calcite) is commonly rare, and matrix material (usually less than 15%) includes clay minerals (esp. kaolinite), mica, and iron oxide; fine-grained rock fragments are often present. Arkose is commonly a current-deposited sandstone of continental origin, occurring as a thick, wedge-shaped mass of limited geographic extent (as in a fault trough or a rapidly subsiding basin); it may be strongly cross-bedded and associated with coarse granite-bearing conglomerate, and it may denote an environment of high relief and vigorous erosion of strongly uplifted granitic rocks in which the feldspar was not subjected to prolonged weathering or transport before burial. Arkose may also occur at the base of a sedimentary series as a thin blanketlike residuum derived from and resting on granitic rock. Etymol: French, probably from Greek archaios, ancient, primitive. Also spelled arcose.
Industry:Mining
A feldspar-rich sandstone; specif., a sandstone intermediate in composition between an arkosic sandstone and a quartz sandstone, containing 10% to 25% feldspar and less than 20% matrix material of clay, sericite, and chlorite.
Industry:Mining
A felsic plutonic rock, generally adamellite or granodiorite, containing an amphibole (often hornblende) as an essential dark-colored constituent; with decreasing quartz it grades through tonalite into normal diorite.
Industry:Mining
A fernlike tree of the coal forest characterized by round-lobed pinnules that are contracted at the base.
Industry:Mining
A fernlike tree of the coal forest, with small ovate pinnules that are attached to the pinnate axis by their whole breadth.
Industry:Mining
