What must be signed on the monthly ventilation report?

• A. A monthly ventilation report signed by the UMM about the mine ventilation system
• B. A monthly ventilation report signed by the UMM
• C. A monthly ventilation report signed by the UMM that includes details before and after any change
• D. A daily ventilation log

Answer: (C)

The key idea is accountability and traceability in ventilation management. The Underground Mine Manager must sign the monthly ventilation report to show they have reviewed and approved the information. Crucially, the report should include details that describe the ventilation system before a change and the details after the change. This pre- and post-change information provides a clear trail of what was happening, what was modified, and how those changes affected airflow, pressures, gas levels, and overall safety. It ensures any alterations are evaluated for safety and compliance and that regulators or auditors can see the impact of changes over time. Signing alone wouldn’t capture the effect of changes, and a daily log isn’t the required monthly report.