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A marked opening driven horizontally into a hillside.
Also known as: Mine level entrance symbol, Drift entrance symbol
On a geological map an adit is drawn as a marked opening at the point where a horizontal tunnel enters a hillside to reach a worked deposit.
Marks the entrance of a horizontal tunnel driven into a hillside to work a deposit.
Contexts: Maps
Reaches a deposit without pumping, which is why adits were driven wherever the ground allowed and shafts only where it did not.
Contexts: Maps
A small angular opening mark drawn at the hillside with a short line running into the slope.