7 Terms
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Mineral mining
The extraction of valuable minerals or other geological materials from the earth for economic interests.
Industry: Mining
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Mineral mining
axis of symmetry
Mining; General mining
An imaginary line in a crystal, crystal structure, or crystal lattice, about which it may be rotated to an identical configuration. If identity occurs once during a complete rotation of 360 degrees , ...
symmetry axis
Mining; General mining
An imaginary line in a crystal, crystal structure, or crystal lattice, about which it may be rotated to an identical configuration. If identity occurs once during a complete rotation of 360 degrees , ...
topographic contour
Mining; General mining
An imaginary line on the ground, all points of which are at the same elevation above (or below) a specified datum surface.
isobar
Mining; General 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 ...
fall line
Mining; General 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 ...
fall zone
Mining; General 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 ...
potentiometric surface
Mining; General 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.
