M-13.1, r. 2 - Regulation respecting mineral substances other than petroleum, natural gas and brine

Full text
104. Signs warning of the danger of the access to a mine and the underground worksites with a surface opening shall be placed at the entrance to the access road to the mine and on each of the sides of the fence or gate surrounding the danger sites, at an interval allowing their visibility, at a distance that may not exceed 30 m.
Warning signs shall be made up of a non-corrosive metallic substance and shall bear at least the word “danger”.
O.C. 1042-2000, s. 104.