From OpenStreetMap Wiki
|man_made = adit|
|A type of entrance to an underground mine which is horizontal or nearly horizontal.|
|Used on these elements|
|Tools for this tag|
Anis a (nearly) horizontal entrance to the underground, by which a mine can be entered or drained of water. The visible portal of the adit is mapped as a node.
- The adit itself.
- What is mined for with the adit. Visit the resources page to view a list of possible values.
- The operator of the adit, usually the operator of the surrounding mine.
- Length in meters.
- The name of the adit.
All of these tags may coexist on a single node.