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S-2.1, r. 14 - Regulation respecting occupational health and safety in mines
Section 466
Disposition versions
466. The excavation toward which the working face is moving shall be considered as being in the blasting zone when the distance between the bottom of the deepest drill hole and the wall of this excavation is less than 5 m (16.4 ft) or when the thickness of the rock mass is less than twice the length of the deepest drill hole if that hole is more than 5 m (16.4 ft) deep. In such cases, sections 464 and 465 apply.
