- المجال: Mining
- Number of terms: 33118
- Number of blossaries: 0
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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 vague remnant of country rock in granite, obscured by the process of granitization. Compare: schlieren; xenolith.
Industry:Mining
A valley eroded in and parallel to the strike of the underlying rocks of a region.
Industry:Mining
A valley eroded in and parallel to the strike of the underlying rocks of a region.
Industry:Mining
A valley or other area that contains numerous springs, geysers, and steaming fissures fed by the same ground-water flow.
Industry:Mining
A valley that follows an anticlinal axis. The term was used as early as 1862 by C.H. Hitchcock. Compare: synclinal valley
Industry:Mining
A valley that follows the line of a fault. Fault valleys are usually straight for long distances.
Industry:Mining
A valley that has been eroded along a zone of weakness at the contact between two different kinds of rock, as between two different sedimentary formations, between igneous and sedimentary rocks, along a fault, or along an upturned unconformity.
Industry:Mining
A valley that owes its origin or form to the underlying geologic structure.
Industry:Mining
A valley trending in the direction of the general dip of the rock layers of a region.
Industry:Mining
A valley whose geologic structure is a syncline. Compare: anticlinal valley
Industry:Mining