Which action is essential before starting a blast to ensure safety?

• A. Ensure all personnel are clear from the blast area
• B. Begin blasting immediately after setup
• C. Post a warning sign only
• D. Proceed with loud shouting to gain attention

Answer: (A)

The key idea is that safety hinges on removing people from the hazard zone before any detonation. If no one is in the blast area, the main route for injury—blast overpressure, flying debris, and ground shock—is eliminated for the workers nearby. Clearing the area and confirming everyone is accounted for creates a true exclusion zone and gives the operator positive control over who is present, which is far more reliable than warnings or signs alone. Starting the blast right after setup or relying on loud shouting to gain attention can fail if someone misses the notice or if conditions change; those methods do not guarantee that the area is safe.