After I read that bad-ass story in the description, you know I had to at least give the song a try (I mean audio miners that fled underneath the Earth's crust to flee the oppression of mainstream music? Freaking Rad! :D) The song is absolutely wonderful, I love the little sound effects that stand for the mining of new sounds and the other nice touches throughout the piece. I will say that, as awesome as the song is, the main melody does start to feel a bit repetitive after awhile.
While the song is rich in effects and ornamentation, a little more musical variation would take this from a 4 to a 5 star song. Excellent job overall.