; The mountainside would risk crumbling. You can't open a hole here. : Occurs when you are trying create a mine entrance on a rock tile that is too steep. The maximum slope is 270.
; There is no space to mine here. Clear the area first. : Occurs when the tile you're standing on has 100 items on. Move a few objects and you can continue.
; 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 tile next to the one you get this message on. You can also get this message : Happens when mining down a floor tile but the exact cause and roof is unknowntoo high, Can only be fixed by collapsing all surround tiles and remining.
; 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.
; You cannot keep mining here. The rock is unusually hard. : The message displayed when one attempts to open a tunnel directly onto a vein.