Nothing in this chapter shall impair any right of an Indian tribe organized under section 16 or 17 of the Act of (), as amended [, 5124], to develop their mineral resources as may be provided in any constitution or charter adopted by such tribe pursuant to that Act [ et seq.].48 Stat. 98725 U.S.C. 512325 U.S.C. 5101June 18, 19341934-06-18