Indiana Code Title 32. Property § 32-23-10-3

(1) minerals are produced under the mineral interest;

(2) operations are conducted on the mineral interest for injection, withdrawal, storage, or disposal of water, gas, or other fluid substances;

(3) rentals or royalties are paid by the owner of the mineral interest for the purpose of delaying or enjoying the use or exercise of the rights;

(4) a use described in subdivisions 1 through 3 is carried out on a tract with which the mineral interest may be unitized or pooled for production purposes;

(5) in the case of coal or other solid minerals, there is production from a common vein or seam by the owners of the mineral interest;  or

(6) taxes are paid on the mineral interest by the owner of the mineral interest.