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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
Buried hill
Mining; General mining
A hill of resistant older rock over which later sediments were deposited. The overlying sedimentary beds have the form of an anticline as the result of original dip, unequal compaction, etc. The term ...
Hand drilling
Mining; General mining
A historical method of drilling blastholes in rock by hammer and a hand-held steel or bit. Single-jack drilling was done by one miner. In double-jack drilling, one miner held the steel for one or two ...
Double-drum hoist
Mining; General mining
A hoist with two drums that can be driven separately or together by a clutch.
Sing
Mining; General mining
A hissing noise often made by gas and water when a seam of coal is cut into.
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