drift mine

noun
1.
a mine the opening of which is dug into an outcrop of coal or ore.
2.
an underground placer mine.

Origin:
1885–90, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
He has been hired as an experienced roof bolter at a drift mine.
The present opencut follows the old drift mine workings.
Where the coal crops out at the land surface, a drift mine entry is constructed and mining is advanced into the coal bed.
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