Environmental conditions at Oakdale Colliery, 1968

measurements have been made using the M.R0E. gravimetric sampler only.Information regarding methods of working, outputs, and manpower is also given. The data are presented in a series of face charts. The colliery had a coalface (all shifts) mean respirable dust concentration of 3. 6 mg/m3. The mean ash content of the respirable dust was 15. 8 percent and the mean quartz content 1. G per cent (concentration 0. O6mg/m3 ). “”