It's remotely possible not to get a skillup in 30 attempts, though I'll admit it's not very likely. I'm not sure what to suggest.
Since you're still at 215 mining you could try mining tin for a bit -- if nothing else it might be easier to find and you should still be able to skill up off it. Some say the cutoff is 225 but in my experience it's been 220 (base skill) - either way, you should have at least 5 more pickupable points.