Iowa Code § 557C.1: Lapse of mineral interests in coal — prevention.

A mineral interest in coal shall be extinguished twenty years after its creation, transfer, or preservation, unless a statement of claim is filed in accordance with section 557C.3, and the ownership shall revert to the person who was then the owner of the interest from which the mineral interest in coal was created, transferred, or preserved. Upon the filing of a statement of claim within the specified period, the mineral interest shall be deemed to have been preserved for an additional period of twenty years, or a shorter period as may be specified in the instrument creating the interest.