Notices of location of mining claims shall be filed for record within ninety days from the date of the discovery of the claim described in the notice, and all instruments shall be recorded in the recording district in which the property or subject matter affected by the instrument is situated, and where the property or subject matter is not situated in any established recording district the instrument affecting the same shall be recorded in the office of the clerk of the division of the court having supervision over the recording division in which such property or subject matter is situated.
30 U.S. Code § 49c - Recording notices of location of Alaskan mining claims
(June 6, 1900, ch. 786, title I, § 15, 31 Stat. 327.)