What is the required incombustible material content in a 200m section of a panel roadway within 400m of a longwall face?

The correct answer is 85% incombustible material content for a 200-meter section of a panel roadway that is within 400 meters of a longwall face. This requirement is established to enhance safety and minimize fire risks in areas where there is an increased potential for combustion, particularly close to working faces where equipment and activities can generate heat and sparks.

The specification of incombustible material content in mining operations is critical for maintaining safe working conditions. It serves to inhibit the spread of fire and limit the production of combustible gases that could arise from various activities associated with coal mining. This standard not only aims to protect the workforce but also ensures compliance with regulatory requirements designed to address fire hazards effectively.

The specified percentage is a reflection of best practices in coal mining safety standards, designed to create a resilient shield against fire, especially in underground environments where access and escape routes can be limited. The higher the incombustible material content, the lower the potential for ignition, thereby enhancing overall operational safety in proximity to high-risk areas like longwall faces.