- 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 back pressure and/or resistance to flow of fluids that a pump must overcome to force a fluid to flow through a pipeline, drill string, etc.
Industry:Mining
The balance weight used to bring up the plunger in a Cornish pumping engine.
Industry:Mining
The balancing of the weight of the winding rope, which varies considerably during a winding cycle.
Industry:Mining
The bank of a stream that is to the left of an observer facing downstream.
Industry:Mining
The barometric pressure of the air at any point is that exerted by the weight of the atmosphere above that point. It therefore varies with the elevation of the point above or the depth below sea level. Barometric pressure is measured by the mercury barometer, and is of the order of 30 in (762 mm) of mercury at sea level.
Industry:Mining
The basic constituent of the ferromagnetic spinels or ferrites. FeO, Fe<sub>2</sub>O<sub>3</sub>, and Fe<sub>3</sub>O<sub>4</sub>have melting points ranging from that of FeO at 1,420 degrees C to that of Fe<sub>2</sub>O<sub>3</sub>at 1,565 degrees C. Used extensively for producing colors in glasses, glazes, and enamels. Iron and iron oxides produce brown or reddish colors in ceramic mixtures if they are fired in an oxidizing atmosphere, and greenish or bluish colors if fired in a reducing atmosphere. Iron oxides are fluxing and coloring materials. Larger particles produce brown or black spots, which, particularly in whiteware, are undesirable. Much care is taken to remove iron and iron oxides from the raw materials and from the bodies used for whiteware manufacture.
Industry:Mining
The basic idea of this system is to confine the mine-car circuit to the smallest possible compass near the mine shaft. This avoids locking up cars on the surface that are better employed underground and reduces labor requirements. In this system, instead of the use of shunt backs on car circuits, the direction of car travel is changed by running onto a portable platform that then moves the car bodily in a transverse direction. The system can be applied, in conjunction with the necessary lifts, to multideck cages. This system may be operated electrically, hydraulically, or pneumatically.
Industry:Mining
The basic legal standard for discovery under the mining law that states: Where minerals have been found and the evidence is of such a character that a person of ordinary prudence would be justified in the further expenditure of his labor and means, with a reasonable prospect of success in developing a valuable mine, the requirements of the statute have been met.
Industry:Mining
