Indiana Code Title 32. Property § 32-23-12-11

Sec. 11. The sale of and execution of any coal lease under this chapter is binding concerning the interest in the coal and the right to mine and remove the coal owned by any defendant to the action in the same manner as if the defendant had personally signed and delivered the lease.  The coal lease is binding on the heirs, legatees, personal representatives, successors, and assigns of the defendant.