open-pit mining


open-pit mining
open-pit mining [ō′pən pit΄]
n.
a method of mining, usually for metallic ores, in which the waste and ore are completely removed from the sides and bottom of a pit which gradually becomes an enormous canyonlike hole: see also STRIP MINING

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       surface mining (q.v.) to obtain minerals other than coal.

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Universalium. 2010.

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