4 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
Subtense bar
Mining; General mining
A horizontal bar used in the subtense system of surveying by tacheometry. It is held at a distant point and its distance is calculated from its known length and the angle that it subtends at the ...
Quadrantal bearing
Mining; General mining
A horizontal angle or bearing less than 90 degrees , measured to north, south, east, or west from a survey line.
Rock drift
Mining; General mining
A horizontal mine passage cut in rock, esp. along a vein on a principal level of a mine. See: crosscut; stope.
Top slice
Mining; General mining
A horizontal block of ore extracted by top slicing. The dimensions vary in different mines.
