765 ILCS 515/8
In the event of the death, resignation, refusal or inability of the trustee to act, the court, upon its own motion or upon the motion of the depository, mineral lessee, or surface owner overlying the severed mineral interest involved in the litigation, shall appoint a successor trustee.
After the entry of the initial judgment authorizing a lease all subsequent proceedings pertaining to the lands and the severed mineral interest involved in the initial litigation, including subsequent leasing proceedings or proceedings by the trustee requesting authority to execute and deliver additional documents pertaining to a mineral lease, shall be commenced and prosecuted in the same case as the proceedings for the initial lease. The acting trustee at the time of any subsequent proceedings shall act as the trustee in said proceedings. The court shall retain continuing authority and jurisdiction to conduct all such subsequent proceedings.
765 ILCS 515/8