50. Where the embankment of an open pit mine has a height of more than 5 m (16.4 ft) and a slope greater than 65º from the horizontal, a guard rail shall be installed on its upper edge. The guard rail shall have at least:(1) a cable at least 10 mm (0.4 in) in diameter kept under tension by tension devices and placed between 1 m (3.3 ft) and 1.2 m (3.9 ft) from the ground;
(2) posts in accordance with paragraph 2 of section 47 and with section 48.