Mine:
There will be a 30% chance of this mine being active. If it is, roll up a random "sentient" creature from the setting you are traveling in.
Notes:
1. If inactive, there will be a 10-60% chance (roll 1-D6 x10) of it being collapsed
in 1-D4 random places. If it is not collapsed, treat it as a dungeon.
2. If you have found this mine, while mining, it will be an ancient mine, buried by
earth through the span of centuries, even ages (this will be strictly up to the
discretion of the G.M.).
If it has been discovered while mining, it will have a 50% chance of being
considered as a dungeon. If it is considered as a dungeon, there will be a
30% chance of it being an actual labyrinth.