Pneumoconiosis Field Research: Environmental conditions at Pentremawr/Cyaheidre 3 Colliery, 1973/74

This report tabulates respirable dust concentrations and compositions at Pentremawr/Cynheidre 3 Colliery for the period April, 1973 to March, 1974. Information regarding seams worked, outputs, methods of working, dust suppression and manpower together with the associated dust concentrations is presented in a series of face charts.At Pentremawr/Cynheidre 3 Colliery the coal face mean respirable dust concentration was 1.4mg/m3. The mean ash content of the respirable dust was 21. 8 per cent and the mean quartz content 2. 5 per cent, representing a concentration of 0. 03mg/m3.Total dust concentrations are also given,and on average were 12. 4 times as high as the respirable dust concentrations.