Ill. Admin. Code tit. 62, § 280.70
b) Exemption
1) This Section shall not apply to mines open for ongoing operations immediately prior to August 3, 1977, to permits issued before August 3, 1977, or to operations under renewals or revisions of such permits. Revisions or renewals of such permits under this Paragraph (b) shall extend to and include only those areas that: