N.M. Code R. § 19.8.3.301
The requirements of 19.8.3 NMAC do not apply to:
C. lands where substantial legal and financial commitments in surface coal mining operations were in existence prior to January 4, 1977.
[11-29-97; 19.8.3.301 NMAC - Rn, 19 NMAC 8.2.3.301, 9-29-2000]