I love chicks who are hot in context. On the street you would be an average looking dame in a brown sweater. But in the company of cave bound science geeks, Aye Mamacita! You are a queen!
I've been down in that mine. It's cool as hell. You don't get to go into the research part, but you tour the old mine workings. At one point they turn off the lights, and the only light is from the tour guide's head lamp. then he goes and turns on the rock drills and it scares the hell out of you, it's so loud.
I highly recommend it for your next northern Minnesota vacation. I think I have pictures somewhere...