C.R.S. § 34-24-112: When visitors allowed underground.

(1) It is unlawful for any person to enter any active or inactive mine unless accompanied by, or with prior written permission from, the operator of said mine.

(2) Persons desiring entry into abandoned mines, where the operator cannot be found, shall first secure written authorization from the office of the commissioner or the office of active and inactive mines.

(3) Any person violating any provision of this section commits a petty offense.

(4) Each violation of this section shall be a separate offense.