* Plank [[QL]] affects the chance of success while constructing.
* Right-click on the door to manage the permissions.
* Decays only off deed over time (loses Strength and disappears when it drops to 0). Average decay amounts to ''40 strength points per RL day''. Mine door decay always takes place in steps of 100 and the actual daily value is random. It sometimes happens that there is no visible decay for several days (strength can remain constant for as much as 7 days) and then suddenly drops by 200. For example, a wooden mine door of 2000 strength will last approximately 50 days. Once down to 300 a mine door should be improved with planks or it will soon vanish.
* Creatures cannot pass through mine doors unless the permissions are set to "allow everyone to use this mine door."
* Creatures being lead ignore permissions.