S-2.1, r. 14 - Regulation respecting occupational health and safety in mines

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47. An opening to the surface of a stope that is not filled in to the surface or closed by a slab in accordance with section 46 shall be surrounded by a fence made of:
(1)  galvanized steel posts no less than 90 mm (3.5 in) in diameter, forming its ends, corners and gates;
(2)  intermediate galvanized steel posts not less than 60 mm (2.3 in) in diameter and spaced at intervals not exceeding 3 m (9.8 ft);
(3)  an upper bar of galvanized steel having a diameter of at least 45 mm (1.7 in) and placed at a height of at least 2.5 m (8.2 ft) above the ground;
(4)  a lower bar of galvanized steel having a diameter of at least 40 mm (1.6 in) and placed at a height of not more than 10 cm (3.9 in) above the ground;
(5)  galvanized No. 9 AWG steel wire mesh, forming links of not more than 60 mm (2.4 in) on a side, welded to the posts and bars at intervals not exceeding 400 mm (15.7 in);
(6)  3 rows of barbed wire fixed at the top and overhanging towards the outside.
O.C. 213-93, s. 47.