If the general body methane in the mine exceeds 2.5%, what information must be recorded, and how long must the record be kept?

• A. Day, time and duration of methane event, part of the mine where the event happened; kept for 7 years.
• B. Details of the ventilation equipment used during the event; kept for 1 year.
• C. Weather conditions at the surface; kept for 3 years.
• D. No specific record is required.

Answer: (A)

When general body methane in the mine exceeds 2.5%, it creates a safety event that must be formally recorded. The required information is the day, the time, and the duration of the methane event, along with the part of the mine where it occurred. This combination of details lets you pinpoint when and where the issue happened and how long it persisted, which is essential for assessing ventilation performance, methane management, and for any necessary follow-up actions or investigations. The record must be kept for seven years, ensuring it’s available for regulatory checks, audits, or future safety reviews.

Other options don’t capture what’s needed: recording details about ventilation equipment isn’t the specified requirement for this trigger, weather conditions at the surface aren’t directly tied to the event’s underground safety implications, and stating that no specific record is required ignores the regulatory obligation to log methane events for safety and compliance.