Colorado Constitution of 1876 Art. V, § 25a. Eight-hour employment

(1) The general assembly shall provide by law, and shall prescribe suitable penalties for the violation thereof, for a period of employment not to exceed eight (8) hours within any twenty-four (24) hours (except in cases of emergency where life or property is in imminent danger) for persons employed in underground mines or other underground workings, blast furnaces, smelters; and any ore reduction works or other branch of industry or labor that the general assembly may consider injurious or dangerous to health, life or limb.

(2) The provisions of subsection (1) of this section to the contrary notwithstanding, the general assembly may establish whatever exceptions it deems appropriate to the eight-hour workday.