For all other areas of the mine (not development), what is the inspection timeframe for personnel?

• A. 24 hours
• B. 12 hours
• C. 8 hours
• D. 7 days

Answer: (C)

Regular checks of people’s whereabouts and safety are essential in underground mining. For areas of the mine other than development, personnel must be inspected at least every eight hours. This eight-hour cadence fits with typical shift changes and handovers, so supervisors can quickly confirm everyone is accounted for and ready to respond if something goes wrong. Waiting longer than eight hours would create a safety gap where someone could be unaccounted for in an emergency, while more frequent checks are not required across all areas unless a higher risk is present.