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Monitoring of rock mass movement, stress change and seismic response has always been an important means to understand the rock mass reaction to mining activities.This paper summarises several field monitoring studies conducted recently by CSIRO in underground coal mines for various purposes including roadway stability, subsidence control, integrated coal-gas extraction, and prevention of dynamic weighting.These studies demonstrate the important role that geotechnical monitoring can play in mine safety, environmental control and optimal mining engineering.