[Iracious]

I am a miner and rock thievery is annoying. How about this, as long as you are in the mining level the rocks will be yours, but if you leave the level, after a few minutes, the rocks will go to no owner. Other's can mine on the rocks but whenever it gets down to the last hit only the owner can hit it to take the rock. And, for bombing rocks for your friends, simply make the mining bomb tradeable.