43 C.F.R. § 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.
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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.