Difinitly check this place out! Best tour I've ever been on. You get your money's worth.
Ride by rail into the mine and then take a walking tour which allows you to experience and see the true inner workings of one of America's oldest mines.
Dress warm! Temp inside the mine is 52 degrees.
I was there last year with my son, during the Miner's Heritage weekend; we even toured the mine. Wonderful!