First off, Welcome Nat! Many of your memories are shared by so many on here!
To answer some of your questions....
1. The Only exixting copy of the Flooded Mine song available to the public is on the "Sounds of Silver Dollar City" LP. There is a clip of it on the B side. It was discussed on the following thread:http://sdcfans.com/forums/index.php?topic=305.msg20289#msg20289
ALSO, at this time there are 3 of them on sale on Ebay right now. (Simply type Sounds of Silver Dollar City into the search on eBay)
2. There in fact was a gunsmith on the park, occupying the same area as the bladesmiths, and for a minimal charge, anyone of age (I think 18) could shoot the black powder rifle at a target next to the gunsmith. This stopped at the latest, about 10 or so years ago.