5 ILCS 615/12
The Department is hereby authorized to cancel any permit or lease issued as provided herein for nonpayment of royalties or nonperformance by the permittee or lessee of any provision or requirement of the permit or lease: Provided, that before any such cancellation shall be made, the Department shall mail to the permittee or lessee by registered mail, addressed to the post office address of such permittee or lessee shown by the records of the office of the Department, a notice of intention to cancel such permit or lease specifying the default for which the permit or lease is subject to cancellation, and if, within thirty (30) days after the mailing of said notice to the permittee or lessee, he shall remedy the default specified in such notice, then no cancellation of the permit or lease shall be entered by the Department, but otherwise, the said cancellation shall be made and all rights of the permittee or lessee under the permit or lease shall thereupon automatically terminate: Provided, further, that failure to pay fees required under permits within the time prescribed therein shall automatically and without notice work a forfeiture of such permits and of all rights thereunder.
5 ILCS 615/12