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Abandoned Mine - Excavations, either caved or sealed, that are deserted and in which further mining is not intended.
Acid Mine Drainage - Liquid drainage from bituminous coal mines containing a high concentration of acidic sulfates, especially ferrous sulfate.
Adit - A horizontal opening giving access to a mine.
Advance Stripping - The removal of barren or sub-grade earthy or rock materials required to expose and permit the minable grade of ore to be mined.
Air Shaft - A shaft used wholly or mainly for ventilating mines, for bringing fresh air to places where men are working, or for exhausting used air.
Airway - Any underground gallery or passage through which a portion of the ventilation passes, that is, the air is carried. Sometimes referred to as an air course. Also called wind road.
Anode - The positive terminal of an e
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