If it appears that any such mines have been worked contrary to the provisions of this Act, the appropriate Government may, if it thinks fit, give notice to the owner, lessee of occupier thereof to construct such works and to adopt such means as may be necessary or proper for making safe the land acquired, and the works thereon, and preventing injury thereto; and if, after such notice, any such owner, lessee or occupier does not forthwith proceed to construct the works necessary for making safe the land acquired and the works thereon, the appropriate Government may itself construct the works and recover the expense thereof from the owner, lessee or occupier.