Adit

horizontal entrance shaft to an underground mine From Wikipedia, the free encyclopedia

Adit
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An adit is a type of entrance to a mine which is horizontal or nearly horizontal. Adits are usually built into the side of a hill or mountain, and often occur when coal or ore is located inside the mountain but above the local valley floor or coastal plain. The use of adits is generally called drift mining.

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Abandoned adit near Pernek
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