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S-2.1, r. 14 - Regulation respecting occupational health and safety in mines
Section 475
Disposition versions
475. Where dynamite has been used:
(1) it is forbidden to unstem a drill hole unless a tamping plug having a thickness of 100 mm (3.9 in) is first placed between the explosive charge and the stemming at the time the drill hole is loaded;
(2) the tamping plug shall consist of paper or any other solid non-ferrous material, brightly-coloured and contrasting with the color of the packaging of the explosive and the stemming used;
(3) during unstemming of a drill hole, the tamping plug and the explosives shall not be subjected to stress or shock;
(4) the unstemming of a drill hole shall be stopped when the tamping plug is reached; a primer shall then be placed on the contact of the tamping plug, and the hole shall be restemmed.
