Wyo. Stat. § 36-5-109
Upon notice provided not less than sixty (60) days before the anniversary date of a lease, all rentals accruing to the state by virtue of this act, except those for the first year, shall become due and payable at the office of state lands and investments on the anniversary date of the lease. If the rent is not paid on the anniversary date, the office shall again notify the lessee or the lessee's authorized agent by certified mail that the lease may be cancelled if the rent and a late fee equal to ten percent (10%) of the annual rental is not received within thirty (30) days following the date of the certified notice. If the lease is cancelled, the office shall as soon as possible thereafter, advertise the lands in the county where located, as vacant and subject to lease.
W.S. 36-5-109