Indiana Code Title 22. Labor and Safety § 22-10-2-4.5

Sec. 4.5. (a) Whenever an operator permanently closes or abandons a coal mine, or temporarily closes a coal mine for a period of more than ninety (90) days, he shall promptly notify the director of the closure.  Within sixty (60) days of the permanent closure or abandonment of a mine, or, when a mine is temporarily closed, upon the expiration of a period of ninety (90) days from the date of closure, the operator shall file with the director a copy of the mine map revised and supplemented to the date of the closure.  Such copy of the mine map shall be certified by a registered surveyor or registered engineer of the state and shall be available for public inspection.

(b) Operators shall give notice of mine closures and file copies of maps with the director.

(c) All entrances to an abandoned mine shall be filled by the operator last engaged in the operation of the mine immediately following abandonment of the mine.  Vertical openings shall be filled and maintained from the bottom to the surface.  All other mine openings shall be filled and sealed in a manner prescribed by the director.