- 行业: Mining
- Number of terms: 33118
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- 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 ...
An imaginary line on the ground, all points of which are at the same elevation above (or below) a specified datum surface.
Industry:Mining
An imaginary line or a line on a map or chart connecting or marking places on the surface of the Earth where the height of the barometer reduced to sea level is the same either at a given time or for a certain period.
Industry:Mining
An imaginary line or narrow zone connecting the waterfalls on several adjacent nearparallel rivers, marking the points where these rivers make a sudden descent from an upland to a lowland, as at the edge of a plateau; specif. the fall line marking the 1151 boundary between the ancient, resistant crystalline rocks of the Piedmont Plateau and the younger, softer sediments of the Atlantic Coastal Plain in the Eastern United States. It also marks the limit of navigability of the rivers.
Industry:Mining
An imaginary line or narrow zone connecting the waterfalls on several adjacent nearparallel rivers, marking the points where these rivers make a sudden descent from an upland to a lowland, as at the edge of a plateau; specif. the fall line marking the 1151 boundary between the ancient, resistant crystalline rocks of the Piedmont Plateau and the younger, softer sediments of the Atlantic Coastal Plain in the Eastern United States. It also marks the limit of navigability of the rivers.
Industry:Mining
An imaginary surface representing the total head of ground water; defined by the level to which water will rise in a well. The water table is a particular potentiometric surface.
Industry:Mining
An imaginary surface representing the total head of ground water; defined by the level to which water will rise in a well. The water table is a particular potentiometric surface.
Industry:Mining
An imaginary surface representing the total head of ground water; defined by the level to which water will rise in a well. The water table is a particular potentiometric surface.
Industry:Mining
An imitation turquoise made of finely powdered ivory which is deposited in a solution of copper.
Industry:Mining
An impact type of breaker consisting of a number of swinging bars or steel hammers hinged to a horizontal shaft that rotates at high speed.
Industry:Mining
An impeding device at dumping locations where there is a hazard of vehicle overtravel.
Industry:Mining
