- 行业: 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 bottom sampler consisting of a pair of sheet-metal skis attached to a light framework for a silk or nylon net. Removable rakers in front of the net stir up the bottom as the dredge advances, permitting the net to capture the benthic fauna and flora contained in the sediment. A bottom-walking wheel connected to a small counter indicates the distance over the bottom the device travels during a haul.
Industry:Mining
A bottom-blown basic pneumatic converter having a basic bottom and lining, usually dolomite, and employing a basic slag.
Industry:Mining
A boulder of local origin produced by weathering and standing in locally derived soil or grus.
Industry:Mining
A boulder that has been ground flat on one or more sides by the action of natural agents, such as by glacier ice, streams, or wind. Compare: faceted pebble.
Industry:Mining
A boundary between strata of different elastic moduli and/or density at which seismic waves are reflected and refracted.
Industry:Mining
A bowl-shaped body of limonite or goethite growing in an inverted position on mineralized bedrock and resembling the shell of an oyster or clam coated with a rusty deposit. It is roughly oval or circular in plan, with a smooth or irregular and scalloped outline; it ranges from 2.5 cm to 1 m in diameter and from 2 to 7.5 cm in height.
Industry:Mining
A bowstring design of girder fabricated entirely from timber components.
Industry:Mining
A box in which a light source, an electromagnet, and a telescope are all mounted in the pendulum apparatus of gravitational recording.
Industry:Mining
