by Zamte » Sat Jan 22, 2011 7:14 am
Tiles will either be part of veins or not. When you mine them it goes through cycles before the wall is destroyed. Each cycle can yield ore, and the number varies. Sometimes it will vanish after a cycle or two, other times it will go for 15-20 cycles. If you find a vein, you'll likely find some ore. If you find the ore just dig along the wall. Caveins drop random rocks in the area and won't always hit you. We had 3-4 cave ins getting ours set up and neither of us got hit by any of them.
In any case, if you dig out 5 or so tiles of an ore vein you should get at least a bar, which is enough for five supports.