§ 3832.43 How may I use a tunnel site?
You may use the tunnel site for subsurface access to a lode claim or to explore for and acquire previously unknown lodes, veins, or ledges within the confines of the tunnel site.
43 CFR 3832.43
You may use the tunnel site for subsurface access to a lode claim or to explore for and acquire previously unknown lodes, veins, or ledges within the confines of the tunnel site.