by ImAwesome » Mon Oct 31, 2011 3:11 pm
you shouldn't have the opening of your cave/minehole inside you walls.
@OP go around your cave check for soft spots. mining hardness is in nodes just like everything else, and the red messages will lead you to the softer areas. when you find the soft spots mine them a bit. it will mostly be rock, but you might find ore. when you get just rock be sure to check its quality. when you get ore zig zag/snake mine a bit and toss it in your smelter. if its a good ore build supports and take it all. if its crap ore keep looking.