25 U.S.C. § 2108

Nothing in this chapter shall impair any right of an Indian tribe organized under section 16 or 17 of the Act of June 18, 1934 ( 48 Stat. 987 ), as amended [ 25 U.S.C. 5123 , 5124], to develop their mineral resources as may be provided in any constitution or charter adopted by such tribe pursuant to that Act [ 25 U.S.C. 5101 et seq.].