Pneumoconiosis Field Research: Environmental Conditions at Deep Navigation Colliery, 1970

This report tabulates respirable dust concentrations and compositions at Deep Navigation Colliery for the period 5th April, 1970 to 3rd April, 1971. Information regarding methods of working, outputs and manpower is also given.The colliery had a coalface mean respirable dust concentration of 6.1 mg/m3. The mean ash content of the respirable dust was 20.3 per cent and the mean quartz content 2.9 per cent (concentration 0.19 mg/m3).Total dust concentrations are tabulated and, on average, were ten times as high as respirable concentrations.