Wyo. Stat. § 30-1-115: Assessment work; rental fee; affidavit required upon completion or payment.

Upon completion of the required assessment work or payment of the annual claim rental fee as required by federal law for any mining claim, the owner or owners or agent of such owner or owners shall cause to be made by some person cognizant of the facts, an affidavit setting forth that the required amount of work was done or rental fee paid, which affidavit shall within sixty (60) days of the completion of the work or payment of the fee, be filed for record, and shall thereafter be recorded in the office of the county clerk of the county in which the said claim is located.