Quick search by citation:

30 U.S. Code § 1755 - Statute of limitations

Except in the case of fraud, any action to recover penalties under this chapter shall be barred unless the action is commenced within 6 years after the date of the act or omission which is the basis for the action.

Statutory Notes and Related Subsidiaries
Applicability

Section no longer applicable with respect to Federal lands, but applicability of section to Indian leases not affected, see section 8(a) of Pub. L. 104–185, set out as a note under section 1732 of this title.