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
Hydraulic jack
Mining; General mining
A jack in which the lifting head is carried on a plunger working in a cylinder, to which oil or water is supplied under pressure from a small hand-operated pump.
Biotitite
Mining; General mining
A jet black igneous rock consisting essentially of biotite. Near Libby, MT, such a rock has been altered to vermiculite by hot waters.
Timber jack
Mining; General mining
A jack to raise and hold crossbars against the roof while props are being set.
