20 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
Crooked hole
Mining; General mining
A borehole that has deviated beyond the allowable limit from the vertical or from its intended course.
Relief well
Mining; General mining
A borehole that is drilled at the toe of an earth dam as a relief for any high water pressure caused by the weight of the dam.
Oversize hole
Mining; General mining
A borehole the diameter of which is excessive because of the whipping action or eccentric rotation of the drill string and bit.
Incline hole
Mining; General mining
A borehole that is drilled at an angle not perpendicular to the Earth's surface.
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