43 C.F.R. § 3833.91

Defects or other problems that cannot be cured and therefore result in forfeiture of your mining claims or sites are:

(a) Failing to record a mining claim or site within 90 days after you locate it;

(b) Failing to pay the location fee or initial maintenance fee within 90 days after you locate it; and

(c) Locating a mining claim or site on lands withdrawn from mineral entry at the time you locate it.