Colo. Rev. Stat. § 34-24-106 – Old workings.

(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.

Editor's note: This section is similar to former § 34-25-108 as it existed prior to 1988.