adit

(redirected from adits)
Also found in: Dictionary, Thesaurus, Medical, Legal, Acronyms.

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 ?
In May 1995, a second occurrence was discovered at the opening of the upper Mex-Tex adit.
1989), it had not been observed by the authors until excellent specimens were recovered from south of the Upper Mex-Tex adit portal during the May-June 1996 dig.
Large plates up to 45 cm with purple, complex fluorite crystals to 10 cm associated with galena and sprinkled with small wulfenite crystals are probably the finest specimens from this adit.
Superb specimens intergrown with fluorite were recovered from the stope at the far end of the Upper Mex-Tex adit.
In September of 1991, one of the authors (TM) discovered the location of the elusive libethenite to be near the opening of the Upper Mex-Tex adit.
The best specimens have been recovered from the upper Mex-Tex adit.
A short adit at the southernmost end of the Upper Mex-Tex workings has produced attractive specimens.
Attractive specimens of drusy quartz dusted with brilliant black murdochite crystals have been found in the unnamed adit at the southernmost end of the Mex-Tex group.
Spectacular specimens of galena completely coated by plattnerite crystals were recovered from the stope at the far end of the Upper Mex-Tex adit.
It occurs rarely with the other phosphates described in this article at the entrance to the Upper Mex-Tex adit, where it is found predominantly as grass-green, glassy spheres (less than 1 mm) perched on quartz crystals.
Although quartz crystals are ubiquitous in all areas of the MexTex mine, exceptional specimens are noteworthy primarily from the Upper Mex-Tex mine and in the vicinity of the unnamed adit at the south end of the workings.