How can the ventilation of large abandoned areas be effectively managed?

Sealing large abandoned areas is an effective method for managing ventilation because it prevents air from entering or leaving these spaces, thereby controlling the atmosphere within them. Proper sealing limits the potential for the influx of hazardous gases or contaminants from surrounding areas, which could pose safety risks for nearby operations. By minimizing the exchange of air, it also helps reduce the overall ventilation burden on the active mine, allowing for a more stable and controlled environment.

In contrast, increasing air pressure is typically not practical for abandoned areas, as it may not address possible cave-ins or structural concerns. Using exhaust fans could lead to unintended airflow patterns that might draw in harmful elements from other areas. Adding more entry points could further complicate the air dynamics and potentially introduce new hazards or contaminants. Therefore, sealing abandoned areas is the most effective strategy for managing their ventilation safely and efficiently.