You can also gem and fossil mine while waiting for your tour. We didn’t try that out so I can’t comment on that experience. Just know that it is available.
We enjoyed the hour tour, 34 stories beneath the surface of earth! We had a great guide! He was super knowledgable, full of stories and funny jokes (we had a lot of Dad Jokers in our tour group). Our guide took plenty of time to answer questions and engage with the group.