- 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 magnetic needle enclosed in a nonmagnetic case, the needle being free to swing over a graduated face or dial. The compass is useful for experimental purposes or for directionfinding in desolate parts of the countryside, or during darkness and foggy weather.
Industry:Mining
A magnetic-field balance instrument much less commonly used than the vertical type. It is quite similar to it in construction except that the magnet points approx. vertically instead of horizontally.
Industry:Mining
A magnetometer primarily suitable for making observations of magnetic field intensity on the surface of the Earth.
Industry:Mining
A main (pipe) for collecting and condensing the volatile matter given off in carbonization of coal in the coking process.
Industry:Mining
A main tunnel driven in the rock underlying a lead and about 50 ft (15.2 m) below the wash dirt. It is used as a drainage tunnel for carrying the water from the drainage holes to the shaft sump and also for the transport of cars from the raises.
Industry:Mining
A major branch of geology that is concerned with the evolution of the Earth and its life forms from its origins to the present day. The study of historical geology therefore involves investigations into stratigraphy, paleontology, and geochronology, as well as the consideration of paleoenvironments, glacial periods, and plate-tectonic motions. It is complementary to physical geology. Not to be confused with history of geology.
Industry:Mining
A major fault with a considerable displacement. A number of collieries and coalfields are limited along one side by such a fault.
Industry:Mining
A major group of igneous rocks, characterized by high potassium content. This suite was so named because of the predominance of potassium-rich lavas around the Mediterranean Sea; specif. those of Vesuvius and Stromboli. Compare: Atlantic suite; Pacific suite.
Industry:Mining
A major or minor explosion of combustible gases in a coal mine, in which coal dust apparently did not play a significant part.
Industry:Mining
