CFR›Title 43›Subtitle B›Chapter II›Part 3860›Subpart 3863 ContainsSections 3863.1–3863.1-4CorpusDaily eCFRDisplayed edition2026-05-12Last updated2026-05-12 Subpart 3863—Placer Mining Claim Patent Applications Sections 3863.1 § 3863.1 Placer mining claim patent applications: General. 3863.1-1 § 3863.1-1 Application for patent. 3863.1-2 § 3863.1-2 Proof of improvements for patent. 3863.1-3 § 3863.1-3 Data to be filed in support of application. 3863.1-4 § 3863.1-4 Applications for placers containing known lodes. Source35 FR 9758, June 13, 1970, unless otherwise noted. Previous 3862 Subpart 3862—Lode Mining Claim Patent Applications Next 3864 Subpart 3864—Millsite Patents