It looks like a beautiful place. A couple of years ago my wife and I went down into an old copper mine and at one point the guy was talking about how the rock all around us was really really old, I don't remember now, like millions of years old maybe. I just reached out and touched the wall because it felt like a really special moment touch history like that.
Copper mine sounds cool. I should be able to tell if I know the location. We have a fairly good map of the entire US
It was the old Quincy mine up in Hancock, MI. They do tours and stuff. I think Michigan Tech even has classes down there in a classroom they built off one of the adits.