CFR›Title 43›Subtitle B›Chapter II›Part 3580›Subpart 3583›43 CFR 3583.4 Citation43 CFR 3583.4CorpusDaily eCFRDisplayed edition2026-08-12Last updated2026-08-12 § 3583.4 Hardrock mineral leases. Previous 3583.3 § 3583.3 Applications for hardrock mineral leases. Next 3583.4-1 § 3583.4-1 Leasing units.