Indiana Code Title 14. Natural and Cultural Resources § 14-36-1-15

(1) from which the overburden has been removed or is being removed;  and

(2) where mine run mineral is being produced in the raw state.

(1) Minerals regulated under this chapter constitute not more than twenty-five percent (25%) of the total tonnage of materials being extracted from the pit and the materials are extracted for purposes of bona fide sale or commercial use.

(2) The overburden above the mineral seam is insufficient for reclamation under section 26 of this chapter.