In mine ventilation, what is the consequence of not having proper stoppings?

In the context of mine ventilation, proper stoppings are essential for controlling the airflow and maintaining air quality within the mine. Stoppings serve to isolate different sections of the mine, allowing for effective management of the ventilation system by directing fresh air to where it is needed and preventing the mixing of contaminated air with clean air.

When stoppings are inadequate or improperly constructed, air can flow freely between different sections of the mine. This disruption can lead to a dilution of fresh air and allows for the infiltration of contaminated air, which may contain harmful gases, dust, or other pollutants. Consequently, this results in reduced air quality. Poor air quality can have severe health implications for miners, including respiratory issues and increased risk of accidents due to decreased visibility or awareness of hazards.

While the other options consider potential effects of inadequate stoppings, they do not directly address the immediate and critical impact on air quality that results from the failure to properly control airflow. Proper ventilation is foundational not only for the safety and health of miners but also for the overall efficiency of mining operations.