What is the purpose of exclusion zones during blasting operations?

• A. To prevent unauthorised personnel from entering blast area and reduce the risk of injury.
• B. To keep the blast area clear for maintenance vehicles.
• C. To ensure easier re-entry after blast.
• D. To monitor environmental noise only.

Answer: (A)

Exclusion zones are a safety control around the blast site that restricts access to authorised personnel only. The main purpose is to prevent people from entering the area during a blast, protecting them from hazards like flyrock, blast overpressure, and ground vibration that can cause serious injuries. The zone’s size is based on the blast design, bench height, delays, and rock properties, so it aligns with the level of risk. Barriers, signage, and permit-to-work systems are used to enforce the boundary and control entry times, with re-entry only after supervisors confirm it’s safe. Other options miss the point: keeping space clear for maintenance vehicles isn’t the primary goal, re-entry after a blast is not meant to be easier but safe and controlled, and environmental noise monitoring is a separate concern.