Blasters & Explosives Handlers

Explosives break rock for roads, foundations, quarries and demolition. They are controlled and safe only when trained people follow strict rules. A mistake in storage, loading or firing can kill many people.

• Blasters
• Quarry
• Demolition

Who may do it

• Only competent, licensed or authorized people may handle and fire explosives. The OSHA rules (29 CFR 1926 Subpart U) require blasting to be directed and supervised by a competent person.
• Federal law (the ATF) regulates explosives storage and sale, and states and cities often require licenses and permits. Check local rules.
• Employees must be trained in the hazards and the safe procedures.

Storage and transport

• Store explosives and detonators in separate, approved, locked magazines away from heat, flame and public areas.
• Keep a log of every item in and out, and report loss or theft at once.
• Transport in vehicles meeting hazmat and explosives rules. Do not carry detonators and explosives together in the same compartment unless the rules allow it.
• No smoking, open flames or sparks near explosives.

Preparing a blast

• A written blast plan covering hole pattern, loading, timing, protection and notifications
• Survey nearby buildings, utilities and people; limit ground vibration and airblast; use a seismograph where required
• Drill holes to the plan and check depth and obstructions
• Load with the right explosive, primers and stemming (material that confines the charge)
• Check for static, radio frequency or lightning hazards before connecting circuits
• Control flyrock with mats, blasting blankets and a safe distance

Firing

1. Warn the area with signs, horns and signals. Know the meaning of each signal.
2. Clear all people and equipment to a safe distance and post guards on access routes.
3. Connect and test the circuit only from a protected location, and keep control of the firing device.
4. Fire the shot, and wait the required time before returning.
5. Inspect for misfires before anyone enters.

Misfires

• Treat every misfire as live. Keep people away and follow the written misfire procedure.
• Only the blaster handles the misfire. Never drill into or near a hole that may contain explosives.

Last updated: October 8, 2026