C.R.S. § 34-21-105

The commissioner, director, division staff, and office staff shall devote their entire time and attention to the duties of their offices. Neither the commissioner, the director, nor any member of the office staff, shall be an owner, operator, employee, controlling stockholder, or director of any producing mine, nor shall any such person act as manager, agent, or lessee for any mining corporation or act as an active member, officer, or employee of any labor union or organization representing miners during the term of such person’s office.