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S-2.1, r. 14 - Regulation respecting occupational health and safety in mines
Section 446
Disposition versions
446. As of 1 April 1993, each diamond drill hole and each point of intersection of such a hole with a working shall be installed in one of the following ways:
(1) they shall be cemented for a minimum length of 5 m (16.4 ft) after the intersection or after the drilling is completed;
(2) they shall be covered with a metal plate at least 12 mm (0.5 in) thick, anchored by 4 rock bolts at least 1.5 m (4.9 ft) long; the plate shall be identified by the letters T.F. and have a pulling resistance of at least 10 metric tons (22,045.9 lb); or
(3) they shall be blocked with a rock bolt having a pulling resistance of at least 10 metric tons (22,045.9 lb).
This section does not apply to a diamond drill hole intended for blasting or a hole used for draining a mine.
