adit defined in 1939 yearadit - Adit (Lat. aclitus, entrance);
adit - Opening driven into a mine horizontally, not, as a shaft, vertically. Adits are generally driven on a slight up-gradient to allow of a ready flow of water, their principal purpose being for drainage, although they are also used for ventilation. In mining districts very long adits have been driven which serve to drain such districts of water, and effect immense economies in dealing with mine water.
Ancient mining was carried out by adits, probably the oldest method. Both coal and lead wore mined in this way. A vertical shaft was often driven to take out the minerals, the horizontal adit being used to remove water and provide ventilation, assisted by fires in the vertical shafts.
near adit in Knolik
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