adit (redirected from adits)

adit (ăd`ĭt), in mining, underground passage excavated nearly horizontally, with one end open to the earth's surface, usually used to service a mine. The adit end is the furthermost end from the surface, i.e., the location where miners work. The adit collar is the area where an adit opens to the surface and must be reinforced against any surface weakness.

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adit [′ad·ət]

(civil engineering)

An access tunnel used for excavation of the main tunnel.

(mining engineering)

A nearly horizontal tunnel for access, drainage, or ventilation of a mine. Also known as side drift.