Colo. Rev. Stat. § 34-48-107
The owner of any mining claim or property who, by reason of established rights, shall be entitled to follow any mineral-bearing vein or lode into the property of another, and the owner of any mining claim or property lying on two or more sides of the property of another has the right to enter and cross such adjoining or intermediate claims or property, with such drifts, tunnels, and crosscuts as may be necessary for the practical or economical mining and development of his own property and for the purpose of extracting and removing ore therefrom. When any such owner and the owners of such adjoining or intermediate claims or property through which such owner desires to pass under the terms of this section and sections 34-48-108 and 34-48-109 shall be unable to agree upon the terms, conditions, and purchase price of rights-of-way for such necessary drifts, tunnels, and crosscuts, then the owner seeking to exercise the rights granted in this section may exercise the right of eminent domain and condemn the rights-of-way into, across, and through such intermediate or adjacent lands such as may be necessary for the practical and economical working of his own property, and such rights-of-way are declared to be private ways of necessity.
C.R.S. § 34-48-107