43 CFR 3832.22 - How much land may I include in my mining claim?
(a) Lode claims. Lode claims must not exceed 1,500 by 600 feet. If there is a vein, lode, or ledge, each lode claim is limited to a maximum of 1,500 feet along the course of the vein, lode, or ledge and a maximum of 300 feet in width on each side of the middle of the vein, lode, or ledge.
(b) Placer claims.
(1) An individual placer claim may not exceed 20 acres in size.
(2) An association placer claim may not exceed 160 acres. Within the association, each person or business entity may locate up to 20 acres. To obtain the full 160 acres, the association must consist of at least eight co-locators. You may locate smaller association claims. Thus, three co-locators may jointly locate an association placer claim no larger than 60 acres. You may not use the names of other persons as dummy locators (fictitious locators) to locate an association placer claim for your own benefit.