Wis. Stat. § 75.115: Rights of persons who have an interest in mineral rights.

Notwithstanding ss. 75.14 (1), 75.16, 75.19 and 75.521 (3) (am) 4., (5), (8) and (13) (b), the failure of an owner of a fee simple interest in surface rights to pay property taxes on land does not extinguish the rights of a holder of a fee simple interest in severed mineral rights related to that land.