Hey! Not really 100% sure if this is an exploit as such, but its really useful anyway.
So all miners know that we only get a skill up of the first mine, regardless of how many more times we are allowed to mine an ore. Well, this was annoying me, and I was trying to mine some adamantite in Nagrand, when I got the skill point, but from behind, was attacked by an earth elemental. I killed the elemental, and I could mine it, so when I went back to the other ore, I got a skill up from it again, In an area of minable things, this should make it alot easier to level your mining, hope you enjoy thisl, thanks