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Attempts to develop Threshold Limit Values together with the correlation between results of various sampling instruments are described. The main objectives of the investigations were: to establish the relationship between dust exposure and the development of pneumoconiosis, to study the effect of...

Field and laboratory measurements of rock properties were conducted to investigate the behavior of rock masses at Chibuluma East deep levels. Intact rock strength was obtained by point load testing, Joint spacing, Joint condition, separation of Joints and the infilling materials were determined...