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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
Precision idler bearing
Mining; General mining
A bearing having ground races and in which the bore and outside diameter tolerances are held to ten-thousandths of an inch and the width tolerance to thousands of an inch.
Biostrome
Mining; General mining
A bedded, blanketlike mass of rock composed mainly of the remains of sedentary organisms; an organic layer, such as a bed of shells or corals, or even a coal seam. Compare: bioherm.
Whole-circle bearing
Mining; General mining
A bearing that defines the direction of a survey line by its horizontal angle measured clockwise from true north.
Antifriction bearing
Mining; General mining
A bearing consisting of an inner and outer ring, separated by balls or rollers held in position by a cage.
Bearing bed
Mining; General mining
A bed that contains, or is likely to contain, ore minerals; one that is productive as opposed to dead or barren.
Slender beam
Mining; General mining
A beam, which if overloaded, will fail by buckling of the compression flange.
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