Terry-
There is also the Quincy Mine just above the city of Hancock. I have only been in the Deleware mine, so that is the only one I can give a personal experience from. We had fun, although it is (or was when I went through) a self guided tour with some information boards along the tour.
I can add that part of the Quincy mine complex is the hoist and shaft house, the worlds largest of it's type. I also believe that the tour there is guided, so you have the opportunity to learn as much as you want.
I have heard good things about the Adventure mine as well. Guided tours and they have some really adventurous ones (like rapelling) if you want to get that extreme.
Perhaps others that have been on tours at Adventure and Quincy mines can lend their experiences.
-John