30 U.S. Code § 623 - Recording and reporting of unpatented claims; time
The owner of any unpatented mining claim located on land described in section 621 of this title shall file for record in the United States district land office of the land district in which the claim is situated
(1) within one year after August 11, 1955, as to any or all locations heretofore made, or within sixty days of location as to locations hereafter made, a copy of the notice of location of the claim;
(2) within sixty days after the expiration of any annual assessment year, a statement as to the assessment work done or improvements made during the previous assessment year.
Source(Aug. 11, 1955, ch. 797, § 4,69 Stat. 683.)