--V0174 19:35, 24 September 2010 (BST) Great that someone created this, I was looking for tag like this for a long time, because I mapped some historic mines near my town. I have some proposals for this tag (I hope they make sense, my English isn't perfect):
constructed=YYYY - when the adit was constructed (the construction began), similar to historical monuments
flooded=yes/no - when the adit is abandoned, it may be flooded by the underground water.
ruins=yes - if the mine is already destroyed or it's still in a good shape.
I also use historic=yes and access tags.
--K4r573n 21:13, 1 December 2012 (UTC) great Idea. I'm confronted by (partly) collapsed mineshafts as well thats why I popose (and added)
Are we sure we want to use the tag depth=* to tag the legth of the adit?
I believe it is just copy/paste mistake and I would like to change it to length=*.