A horizontal passage leading into a mine for the purposes of access or drainage.The mine's three adits lie in the Shinarump conglomerate member of the Triassic Chinle Formation....
The Jomac mine's three adits lie within the Glen Canyon National Recreation Area boundary.
The mule train would have entered the mine through an adit.
Origin
Early 17th century: from Latin aditus 'approach, entrance', from adit- 'approached', from the verb adire, from ad- 'towards' + ire 'go'.