What is essential for ventilation at faces with unusual quantities of gas or smoke?

The use of line brattice or other approved methods is essential for ventilation at faces with unusual quantities of gas or smoke because these methods help to effectively control and direct the airflow in the mine, thereby reducing the concentration of harmful gases and providing a breathable atmosphere for miners. Line brattice is a flexible air ducting system that allows for better distribution of fresh air to areas with potential hazards, ensuring that any buildup of gas or smoke is adequately ventilated away from work areas.

Natural ventilation alone may not be sufficient in situations where there is an unusual or increased presence of hazardous gases or smoke, as it relies on natural air movement, which can be unpredictable. Manual air flow adjustments could be useful but may not provide the systematic and controlled ventilation that approved methods like line brattice offer, especially in emergency situations. Shutting down the operation may indeed be a necessary safety measure, but it does not address the immediate need for ventilation in areas that are at risk. Thus, utilizing line brattice or other approved ventilation methods directly addresses the critical requirements for managing air quality and safety in underground mines.