Mining a cave wall inside of a mine will remove that tile of rock. It takes 45 mining actions to produce the message {{event|inline|The wall will break soon}} after which it takes 1 to 11 actions to fully remove the tile.
* It is possible to mine up, down or flat but only the final action is taken into account. The resulting slope of up or down will be approximately 20. Ceiling will be 30 above the created floor whatever its shape is.
* There are slight deviations in mine slopes (up to 3 "Slope") when a mine shaft progresses.This is based off Mining Skill.
** skill less than 50, +-3
** skill = 70, variance is +-1
** skill = 90+ no variance
* When mining a tile next to an opened tile, slope of the existing tile will be kept but may also change with same variance.
* When connecting two mine shafts, the direction of the mining is irrelevant; one floor will connect to the other floor and ceilings will likewise connect.
* Each action will produce one stone shard.