1. (1) The period of employment of persons working in all underground mines, underground workings, and smelters may exceed eight hours within a twenty-four-hour period upon the following conditions:

   1. (a) The operator of the underground mine, underground workings, or smelter establishes a work plan setting forth the terms and conditions under which the period of employment may exceed eight hours in a twenty-four-hour period; and
   2. (b) The operator provides reasonable notice to its employees, except in cases of emergency or upset conditions, of proposed increases in the regular work schedule which would result in a period of employment in excess of eight hours in a twenty-four-hour period. Reasonable notice shall be construed to be not less than one week, during which time affected employees may comment.
2. (2) Nothing in this section shall be construed so as to alter the provisions of any collective bargaining agreement.

Source: L. 13: p. 306, § 2. C.L. § 4173. CSA: C. 97, § 101. CRS 53: § 80-7-2. C.R.S. 1963: § 80-14-2. L. 87: Entire section amended, p. 376, § 2, effective June 20. L. 89: Entire section R&RE, p. 375, § 1, effective April 5.