- 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 line constructed on a map, somewhat similar to a contour line, but connecting points of equal moisture content of coal in the bed.
Industry:Mining
A line drawn on a map or chart to represent the planned or actual track of an aircraft during the taking of aerial photographs.
Industry:Mining
A line drawn on a map through points of equal true thickness of a designated stratigraphic unit or group of stratigraphic units. Compare: isochore thickness contour.
Industry:Mining
A line drawn on a map to represent an imaginary line in the water table of a definite level. These contours are constructed from the data provided by the water-table levels, corrected for differences in surface level at the respective boreholes. A site investigation or opencast plan sometimes show water-table contours.
Industry:Mining
A line drawn on a plan joining points on the floor or roof of a seam that have the same height above a prescribed datum.
Industry:Mining
A line drawn through points whose annual change in magnetic declination is equal.
Industry:Mining
A line drawn through points whose annual change in magnetic declination is equal.
Industry:Mining
A line from a crane boom to a clamshell bucket that holds the bucket from spinning out of position.
Industry:Mining
A line indicating equivalence in lithofacies development; e.g., a particular value of the sand-to-shale ratio.
Industry:Mining
