49. Any explosive charge that misfired must not be extracted, but must be blasted again during the same work shift.
During the repriming or refiring, the authorization holder must make sure that
(1) the untamping of the mouth is done by the person who loaded and fired the shotpoint, unless the person is unable to do so;
(2) during all untamping, repriming and firing operations, only the person responsible for the operations is present in the blasting area; and
(3) the material used for untamping and the shotpoint and inserted in it is made of non-ferrous materials.
If dynamite has been used as explosive charge, it is prohibited to untamp a shotpoint unless a tamping plug is placed between the explosive charge and tamping at the time the shotpoint is loaded. The tamping plug must consist of paper or any other solid non-ferrous material, have a thickness of 100 mm, brightly-coloured and contrasting with the colour of the packaging of the explosive and the tamping material used. During untamping of a shotpoint, the tamping plug and the explosives must not have been subjected to stress or shock. When the tamping plug is reached, untamping must be stopped; a primer must then be placed on the contact of the tamping plug and the hole must be restemmed.
If the repriming or refiring operation is impossible, the explosives that are not dynamite must be extracted in accordance with a procedure drawn up by an engineer, taking into account the types of explosives and the manufacturer’s instructions and the physical environmental conditions. The procedure must be kept at all times on the activity site.
1252-2018O.C. 1252-2018, s. 49.