Colorado Revised Statutes Title 34. Mineral Resources § 34-24-110. Abandoned mine to be covered--penalty

(1) Every abandoned or inactive mine endangering the life of man or beast shall be securely covered or fenced. It is the duty of the operator of such mine, upon the abandonment or cessation of operations therein or thereon, to securely cover or fence the same and post a “No Trespassing” sign bearing the name and address of the owner or operator. Anyone failing to securely cover or fence such mine or any person removing such fence or covering without permission of the operator commits a civil infraction. Such fine when assessed and paid shall be distributed as follows: Seventy-five percent to the office of active and inactive mines to be used to cover or fence mines that are dangerous to man or beast and twenty-five percent to the general fund of the state.

(2) In the case of any abandoned mine or any inactive mine where the owner or operator is unknown or cannot be found, the office of active and inactive mines has the right to erect a sign across or near the entrance of any such mine prohibiting the trespassing by any person, except as provided in section 34-24-112, into the mine and warning any trespasser that any such trespasser will be prosecuted and subject to the penalty provided for in subsection (3) of this section.

(3) It is unlawful for any person to trespass into any mine. Any person so trespassing commits a petty offense.

(4) This provision shall not conflict with the requirements placed on those mines regulated by the mined land reclamation board or office of mined land reclamation pursuant to the provisions of articles 32 and 33 of this title.