30 U.S.C. § 161 — Entry of building-stone lands; previous law unaffected

This section lets people claim public land that is mainly valuable for its building stone. Any person authorized to enter lands under the mining laws of the United States may enter lands that are chiefly valuable for building stone, using the provisions of the law relating to placer mineral claims (a type of mining claim for loose or scattered minerals). There's a limit: land reserved for the benefit of public schools, or donated to any State, cannot be entered under this section. Finally, nothing in this section repeals section 471 of title 16, the law relating to establishing national forests.