by daemmon » Mon Feb 14, 2011 7:00 pm
Not pretty sure what you actually found.
a) You found a mine hole?
b) You found a vein in a cave?
If it's a) then probably build that mine and is going to defend it if he sees you around (altho, if it's not walled or at least claimed -.-
If it's b) I dont know the exact answer, but I do know that it has a lot of ores to be mined.