43 C.F.R. § 3832.43 How may I use a tunnel site?
Title 43 - Public Lands: Interior
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.
Title 43: Public Lands: Interior
PART 3832—LOCATING MINING CLAIMS OR SITES
Subpart D—Tunnel Sites
§ 3832.43 How may I use a tunnel site?
