- 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 ...
A collective term for the late Percambrian fragmental rocks of Scandinavia, esp. the feldspathic sandstones of the Swedish Jotnian, consisting mainly of coarse arkoses and subarkoses, together with polygenetic conglomerates and graywackes. Etymol: Greek sparagma, fragment, thing torn, piece.
Industry:Mining
A collective term for the various processes by which minerals or mineral assemblages are locally segregated from an initially uniform parent rock during metamorphism; e.g., garnet porphyroblasts in fine-grained mica schist.
Industry:Mining
A collective term introduced by Folk (1959) for one of several varieties of discrete and organized carbonate aggregates that serve as the coarser framework grains in most mechanically deposited limestones, as distinguished from sparry calcite (usually cement) and carbonate-mud matrix (micrite). Important allochems include silt-, sand-, and gravelsize fragments torn up and reworked from the deposit; ooliths; pellets; lumps; and fossils or fossil fragments (carbonate skeletons, shells, etc.).
Industry:Mining
A collective term introduced by Folk (1959) for one of several varieties of discrete and organized carbonate aggregates that serve as the coarser framework grains in most mechanically deposited limestones, as distinguished from sparry calcite (usually cement) and carbonate-mud matrix (micrite). Important allochems include silt-, sand-, and gravelsize fragments torn up and reworked from the deposit; ooliths; pellets; lumps; and fossils or fossil fragments (carbonate skeletons, shells, etc.).
Industry:Mining
A collective term, first used by Finnish geologists, for metamorphosed mafic rock that has lost all traces of its original texture and mineralogy owing to complete recrystallization.
Industry:Mining
A collector that utilizes a fabric or cloth to remove dust particles from the air. The basic idea is the same as that employed in vacuum cleaners, but there is usually an automatic or self-cleaning feature for recovering the dust. Fabric-type dust collectors should not be subjected to excessively abrasive or corrosive materials, or high temperatures that might injure the fabric, unless special materials have been employed for that purpose. Bags and tubes employing glass filter fabric are capable of handling gases with temperatures up to 550 degrees F (288 degrees C), and also can withstand the action of many corrosive gases. Fabric-type collectors fall into two groups on the basis of design. One uses the fabric in a closed bag or a series of small-diameter bags commonly called tubes, while the other has the fabric on a frame like a screen.
Industry:Mining
A collier who works at the face of a narrow stall or a longwall stall. The collier is paid according to a pricelist of so much per ton of coal loaded out and for other work, such as timbering. A stallman usually has another miner alongside.
Industry:Mining
A colloidal bond which, when added to molding sands in amounts up to 3%, increases porosity and strength (green and dry), and reduces the amount of water needed.
Industry:Mining
A colloidal form of aluminum hydroxide, Al<sub>2</sub>O<sub>3</sub>.H<sub>2</sub>O , occurring as one of the constituents of bauxite.
Industry:Mining
