30 U.S.C. § 73 - U.S. Code - Unannotated Title 30. Mineral Lands and Mining § 73. Presentation of claims

All claims under section 72 of this title must be presented to the register of the proper land district within sixty days after the date of actual possession and the commencement of improvements on the land, by the filing of a declaratory statement therefor; but when the township plat is not on file at the date of such improvement, filing must be made within sixty days from the receipt of such plat at the district office.