I believe there is three, we had a get together this year and that was part of it.
Mike and Chris Murley who are members on this forum are guides on some of the tours.
The one I'm familiar with is the Lackawanna Tour:
This link is broken, either the page no longer exists or there is some other issue like a typo.
Chris or Mike will see this post and be able to provide some other info, they offer there own personalized tours that include tours of old mining areas on the surface as well as the the ones inside the mine: http://undergroundminers.com/tours.html
Moving this to the discussion forum.