US lawFederal (United States)RegulationsTitle 43 CFR — Public Lands: InteriorChapter II — BUREAU OF LAND MANAGEMENT, DEPARTMENT OF THE INTERIORPart 3832 — LOCATING MINING CLAIMS OR SITESSubpart D — Tunnel Sites3832.4343 C.F.R. § 3832.43How may I use a tunnel site?Last amended: 2016Year: 2026Length: 32 wordsOfficial source Cite as 43 C.F.R. § 3832.43 (2026)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.Previous43 C.F.R. § 3832.42Next43 C.F.R. § 3832.44