This is a touchie area to get into.. I persoanll have never understood the laws when pertaining to collection of rocks and minerals via public owned lands.. However, I would ask the park ranger for more details.. True I have been camping the smokeys also.. and have found several things Including a "shot" ball or musket ball.. but of couse because this land was publicly owned, I simply took the ball to the museum station etc and handed it over.. Once I even took a pic of a brown/black moth the name scapes me.. but told the rangers and youd thought I'd found gold.. Cause the moth was rare and they even paid me for the image as well as putting my name in their registry.