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United States Bureau of Mines
Industry: Mining
Number of terms: 33118
Number of blossaries: 0
Company Profile:
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 lens for producing convergent light.
Industry:Mining
A lens free from both chromatic aberration and spherical aberration.
Industry:Mining
A lens free from spherical aberration. Compare: aberration See also: aplanachromatic lens
Industry:Mining
A less-preferred syn. of "fault zone."
Industry:Mining
A less-preferred syn. of granophyre.
Industry:Mining
AQ
A letter name specifying the dimensions of bits, core barrels, and drill rods in the A-size and Q-series wireline diamond drilling system having a core diameter of 27 mm and a hole diameter of 48 mm.
Industry:Mining
HQ
A letter name specifying the dimensions of bits, core barrels, and drill rods in the H-size and Q-group wireline diamond drilling system having a core diameter of 63.5 mm and a hole diameter of 96 mm.
Industry:Mining
NQ
A letter name specifying the dimensions of bits, core barrels, and drill rods in the N-size and Q-group wireline diamond drilling system having a core diameter of 47.6 mm and a hole diameter of 75.7 mm.
Industry:Mining
A level area or plain in an arid or semiarid region, encrusted with alkali salts that became concentrated by evaporation and poor drainage; a salt flat.
Industry:Mining
A level or gently sloping tract or a slightly undulating land surface produced by extensive deposition of alluvium, usually adjacent to a river that periodically overflows its banks; it may be situated on a flood plain, a delta, or an alluvial fan. Compare: alluvial flat.
Industry:Mining