Employment in all underground mines, underground workings, and smelters is declared to be injurious to health and dangerous to life and limb.
Source: L. 13: p. 306, � 1. C.L. � 4172. CSA: C. 97, � 100. CRS 53: � 80-7-1. C.R.S. 1963: � 80-14-1. L. 87: Entire section amended, p. 376, � 1, effective June 20.