Barometric pressure measurement and recording: which statement is true?

• A. It is measured daily but not recorded
• B. It is continuously measured and recorded, and the record must be kept at the mine in an accessible location; ERZ Controllers check trend
• C. It is measured only on demand by the VO
• D. It is not recorded

Answer: (B)

Barometric pressure directly influences mine ventilation by driving or opposing air flows between the surface and underground. Because pressure can change with weather, blasting, or operations, you need a continuous stream of data to see how ventilation performance evolves over time, not just a single moment.

Keeping the record at the mine in an accessible location ensures that the VO, supervisors, and ERZ Controllers can readily review trends during routine checks, incidents, or emergencies. The trend data lets them detect gradual or sudden shifts in ventilation that could affect air quality and safety, and they can respond promptly.

Continuous measurement and recording also provide traceability for compliance and investigations, something a daily or on-demand approach would miss. The ERZ Controllers rely on ongoing data to monitor and adjust ventilation as needed, which is why this approach is the correct one.