- 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 unit of waterflow or airflow that equals 1 ft<sub>3</sub>/s (0.028 m <sub>3</sub>/s).
Industry:Mining
A unit of weight that equals 5,760 grains, 12 tr oz, 240 pennyweights, 13.1657 avoirdupois oz, 0.82286 avoirdupois lb, or 373.2509 g.
Industry:Mining
A unit of work or energy equal to that expended in 1 h at a steady rate of 1 kW or 3.6 x 10<sub>6</sub>J.
Industry:Mining
A unit of work; the work done in raising the weight of 1 g vertically 1 cm; 981 ergs.
Industry:Mining
A universal-type soil-sampling device in which some of the constructional features of two or more special-use samplers are combined.
Industry:Mining
A uranium and/or vanadium orebody in a sandstone lens or layer, which cuts across bedding in sharply curving forms, commonly C-shaped or S-shaped in cross section. Two types can be distinguished: the Colorado Plateau type, named in 1956, and the Wyoming type, named in 1962. Roll orebodies of the Colorado Plateau type are of highly variable geometry, with their longest dimension in plan view parallel to the axes of buried sandstone lenses representing former stream channels, and surrounded by a wide halo of reduced (altered) rock. Orebodies of the Wyoming type are crescent-shaped in cross section and typically form in relatively thick, tabular, or elongate sandstone bodies, with the tips of the crescent thinning and becoming tangent to mudstone layers above and below.
Industry:Mining
A uranium prospector's term, esp. on the Colorado Plateau, for the ratio of the total thickness of red mudstone to that of green mudstone within an assumed stratigraphic interval. Its value is based upon the premise that uranium-bearing solutions will bleach red mudstone containing ferric iron to green mudstone containing ferrous iron in the course of depositing uranium minerals.
Industry:Mining
A useful contrivance for measuring the deformation in the cross section of a shaft. It consists of a length of 1-1/2-in (3.8-cm) pipe fitted at one end with a micrometer and at the other end with a hard steel cone. The micrometer should have a range of 3 to 4 in (7.6 to 10 cm) and should fit into a bushing in the pipe in some manner. It may thus be removed from the bar for safe keeping or during transport.
Industry:Mining
