Misfire Procedure
Critical safety steps for handling misfires
CRITICAL SAFETY PROCEDURE
Misfired explosives are extremely dangerous. Follow each step carefully.
15-Minute Timer
Start after last expected detonation
Misfire Procedure - Checklist
0% completeWait minimum 15 minutes after the last charge was due to explode
Criticals.169(1)
Do not approach the blast area during the wait period
(Electric detonators) Disconnect and short-circuit all lead wires
Criticals.169(2)(a)
Lock the safety switch in the open position
Enter the blast area cautiously with minimum personnel
Criticals.169(2)
Only authorized blaster personnel may enter
Inspect all holes and mark any misfired holes clearly
Criticals.170
Do not attempt to remove explosives from misfired holes
Criticals.171
Misfired explosives are extremely dangerous and unpredictable
Report misfire to employer immediately
Criticals.172(1)
Follow employer's code of practice for misfire disposal
s.172(2)
Document the misfire in the blast log
s.172
Secure the area until misfire is safely disposed of
CriticalMaintain warning signs and guards until all-clear
Important Reminders
- !NEVER attempt to remove explosives from a misfired hole
- !NEVER drill into or near a misfired hole
- !Document all details for incident report
Reference: NB Reg 91-191, Sections 169-172