adit

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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.

Adit

 

a horizontal or inclined excavation that has an outlet to the surface and is designed to facilitate mining operations. Adits can be exploratory or used for working deposits. Transport, ventilation, and water-removal adits are distinguished, depending on their purpose.

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.

adit

An entrance or passage.
References in periodicals archive ?
Adit has also been responsible, on behalf of One NorthEast, for managing the project to upgrade telephone exchanges for broadband.
Pale gray-green spherical masses (to 6 mm) have also been found in small vugs lined with milky quartz crystals associated with an altered galena body in the lower adit. Acicular, pale orange crystals occur with wulfenite, and matted aggregates of very fine acicular yellow crystals have also been found on milky quartz crystals.
The CTS TBM began boring in August 1998, driving the first adit which will penetrate the reef and enter the footwall at the 6500 level (measured in feet above sea level, that is 1,981 m).
Azurite was found during a May-June 1996 dig about 10 feet in front of the Upper Mex-Tex adit while searching for linarite and spangolite specimens.
This has involved the treatment of more shafts, adits and stopes, particularly around Lordshill.