Development Panel stone dust requirements specify which rate?

Development Panel stone dust requirements specify which rate?

• A. Every 30m or 24 hours at 40kg/m
• B. 150 kg/m per hour
• C. 60 kg/m
• D. 85% coverage within 200m

Answer: (A)

Stone dusting in development panels is about maintaining an inert environment to reduce the risk of coal dust explosions. The required practice is to apply stone dust at a rate that guarantees adequate coverage along the panel and is refreshed as the panel advances. The specified rate of 40 kilograms per metre, with reapplication every 30 metres or within 24 hours, ensures the fresh coal dust generated by excavation is continually diluted and covered by inert material. This keeps the protective layer effective even as ventilation and movement remove dust. The other options don’t fit because they either mix up the measurement (per hour instead of per metre), propose a different rate (60 or 150 kg per metre), or refer to a coverage percentage rather than an actual application rate and refresh interval.

Stone dusting in development panels is about maintaining an inert environment to reduce the risk of coal dust explosions. The required practice is to apply stone dust at a rate that guarantees adequate coverage along the panel and is refreshed as the panel advances. The specified rate of 40 kilograms per metre, with reapplication every 30 metres or within 24 hours, ensures the fresh coal dust generated by excavation is continually diluted and covered by inert material. This keeps the protective layer effective even as ventilation and movement remove dust.

The other options don’t fit because they either mix up the measurement (per hour instead of per metre), propose a different rate (60 or 150 kg per metre), or refer to a coverage percentage rather than an actual application rate and refresh interval.