Colo. Rev. Stat. § 8-4-104
Every person, firm, association, corporation, or agent, manager, superintendent, or officer thereof engaged in the business of extracting or of extracting and refining or reducing metals or minerals other than petroleum, or other than parties having a free unencumbered title to the fee simple of the property being worked, and also other than mining partnerships in respect to the members of the partnerships, shall, before commencing work in any period for which a single payment of wages is to be made, have on hand, either physically or by deposit with a bank or trust company in the county where such property is located or, if there is no bank or trust company in the county, in the bank or trust company nearest the property, cash or readily salable securities of a market value equivalent to such cash, or accounts receivable payable in the normal course of business prior to the next payday, in a sufficient amount to make the payment of wages without discount or loss to any person employed on the mining property for such period.
C.R.S. § 8-4-104
This section is similar to former § 8-4-103 as it existed prior to 2003, and the former § 8-4-104 was relocated to § 8-4-109.