Wyo. Stat. § 30-1-111: Assessment work for placer claims; character and kind.

For every placer claim, assessment work, as hereinafter provided, shall be done during each and every year after the first day of September following the date of location. Such assessment work shall consist in manual labor, permanent improvements made on the claim in buildings, roads or ditches made for the benefit of working such claims, or after any manner, so long as the work done accrues to the improvement of the claim, or shows good faith and intention on the part of the owner or owners and their intention to hold possession of said claim.