(1) The entrance to inactive or abandoned workings shall be posted to warn unauthorized persons against entering the territory.
(2) Abandoned workings shall be sealed or ventilated.
Source: L. 88: Entire article R&RE, p. 1197, § 5, effective July 1.
Old workings
Colo. Rev. Stat. § 34-24-106, under Duties and Responsibilities of Operator.
Colo. Rev. Stat. § 34-24-106