- 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 worldwide disturbance of the Earth's magnetic field, commonly with amplitude of 50 to 200 gammas. It generally lasts several days, and is thought to be caused by charged particles ejected by solar flares. Magnetic prospecting usually has to be suspended during such periods.
Industry:Mining
A wound rotor induction motor differs from a squirrel cage induction motor only in the construction of its rotor. The rotor, instead of having short-circuited copper bars, has a definite winding connected for the same number of poles as the stator with the leads brought out to slip rings. The stator and rotor are commonly called the primary and secondary, respectively, because under locked rotor conditions, the motor becomes a transformer with a given ratio. This ratio depends upon motor design and is not standardized. Frequently called a slip ring motor.
Industry:Mining
A woven-wire conveyor belt composed of various combinations of flattened-helical coils of wire, which may or may not be joined by straight or crimped members.
Industry:Mining
A wrench that has a smooth segmented sleeve that when tightly clamped around the tube of a core barrel, will not mar or distort the thin tube when the core barrel is taken apart.
Industry:Mining
A written and/or graphic record of the data obtained from drillhole core. In addition to the data given in geologic logs, geotechnical logs require more detail on discontinuities such as fractures, joints, bedding, rock quality designation, and hydrologic conditions. Compare: geologic log.
Industry:Mining
A written and/or graphic record of the geologic data obtained from drillhole core and/or cuttings. In noncore drilling, the cuttings are separated at depth intervals of about 1 m or 2 m and examined. In core drilling, the core is kept in sequence and examined. The essential description of core includes lithology, alteration, mineralization, and structural discontinuities. Compare: geotechnical log
Industry:Mining
A written notice prominently posted on a claim, giving name of locator and description of its extent and boundaries.
Industry:Mining
