Changes

; You fail to produce anything here. The rock is stone hard. : Occurs on the surface. This means the tile you are attempting to excavate is actually an ore vein. There's nothing to do about it, you simply have to make your entrance on another tile. Note that if you make the entrance one tile below the vein, the tunnel will open right into the vein and cannot be extended until the vein is depleted. The best course of action at this point would probably be to mine out a rock dile next to the one you get this message on. You can also get this message when mining a floor tile but the exact cause is unknown.

; You hear falling rocks from the other side of the wall. A deep shaft will probably emerge. : Occurs inside a mine. Caused when there is already another mine nearby, but there is too much of a height difference to connect the two mines.

There is also a message for attempting to mine underwater; wording unknown.