1. A subterranean cavity or passage; especially: (a) A pit or
excavation in the earth, from which metallic ores, precious stones,
coal, or other mineral substances are taken by digging; --
distinguished from the pits from which stones for architectural
purposes are taken, and which are called quarries. (b) (Mil.) A cavity
or tunnel made under a fortification or other work, for the purpose of
blowing up the superstructure with some explosive agent.
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2. Any place where ore, metals, or precious stones are got by digging
or washing the soil; as, a placer mine.