All of the troll related products are ridiculously high in experience cost, so I think it'd only be fair to give the poor (probably dead) miner an experience when he unearths a troll. Me and my buds were tossing around an idea, and the text could probably go to this effect (except more jorby, of course)
"You hear the earth around you crumble as it gives way to a small cavern, inside of which a foul smelling green creature resides. With a beat of its chest and a roar of anger, you realize the troll is about to end your life. Do you run, or do you fight?"
in the current state of things the miners gonna die 9 times out of 10, but it's still worth the idea.