Colo. Rev. Stat. § 34-53-107
If any person, association, or corporation is or claims to be the owner or entitled to the possession of any mining claim in the actual possession of some other person, association, or corporation claiming to be the owner or entitled to the possession thereof, and mining and shipping ore therefrom, if he desires to hold purchasers of such ore responsible for the value of such ore, may serve or cause to be served upon such purchaser a notice in writing, setting forth the name of the mining claim, the names of the claimants and owners thereof, the name of the person, association, or corporation mining or shipping ore therefrom, and warning such purchaser that he will be held responsible for all ores purchased and delivered from such mine by such person, association, or corporation, or his heirs and assigns subsequent to the service of such notice. Within five days from and after the service of such notice, the person, association, or corporation serving or causing the same to be served shall institute an action in some court of competent jurisdiction against the person, association, or corporation in possession of such mining claim to enjoin him from the mining or shipment or sale of ores therefrom pending such action and shall at once notify such purchaser of the pendency of such action. If the notice provided for in this section shall be served after such an action has been instituted it shall not be necessary to commence another under the provisions hereof.
C.R.S. § 34-53-107