Each mineral lease shall contain the following covenants:
(1) the lessee shall promptly pay any rent annually in advance;
(2) waste may not be committed on the land;
(3) the premises shall be surrendered at the expiration of the term;
(4) the lessee may not assign or sublet without the prior written authorization of the director; and
(5) if authorized improvements have been placed on the land by any person other than the lessee, the lessee shall allow the owner of the improvements to remove them within 90 days.