30 U.S.C. § 28i

Failure to pay

Failure to pay the claim maintenance fee or the location fee as required by sections 28f to 28 l of this title shall conclusively constitute a forfeiture of the unpatented mining claim, mill or tunnel site by the claimant and the claim shall be deemed null and void by operation of law.

( Pub. L. 103–66, title X, § 10104 , Aug. 10, 1993 , 107 Stat. 406 ; Pub. L. 111–88, div. A, title I , Oct. 30, 2009 , 123 Stat. 2908 .)