CFR › Title 43 › Part 3835 › §3835.9143 CFR §3835.91Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkIf you fail to file an annual FLPMA document by December 30, as required in § 3835.31(d), you forfeit the affected mining claims or sites.