No surface coal mining activities may be conducted in close proximity to any point of an active underground mine, to the extent that the surface mining activities could be declared a nuisance and danger to the health, safety and welfare of persons within an active underground mine. All surface mining activities shall be conducted with and in compliance with the Pennsylvania Anthracite Coal Mine Act (52 P. S. §§ 70-101-70-145).
25 Pa. Code § 88.113
This section cited in 25 Pa. Code § 88.54 (relating to surface mining near underground mining); and 25 Pa. Code § 88.381 (relating to general requirements).