30 U.S.C. § 623 : US Code - Section 623: Recording and reporting of unpatented claims; time

Search 30 U.S.C. § 623 : US Code - Section 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.