Geophysical techniques provide the opportunity for remote assessment of the state of a rock mass and to remotely monitor changes in its behaviour. Geophysical techniques are widely used for these purposes in resource exploration and extraction. Because coal outbursts can be associated with geological structures and with zones of anomalous […]

Gas Monitoring System The gas monitoring systems widely used in Australian underground mines are: Tube Bundel System ( ACARP report C 3076) Telemetry System ( ACARP report C 3076) Advantages of Tube Bundel System Disadvantages of Tube Bundel system Continious monitoring Monitoring of full range of gases Sometimes difficult to locate […]

Outburst prediction indices( ACARP C 4034 Chapter 9) Different indices are use in different countries to predict an outburst Ettinger’s Sorption/ Desorption index : This index was developed initially by Ettinger (1953) as the means of classifying coal in terms of proneness to outburst. The gas emission index was based on the gas pressure […]

Geology plays a very important role in the manifestation of Outbursts. Seams having complex geological structures are more prone to outbursts if high gas conditions are prevalent. The following points need attention when geological factors are being considered. • Any structure related to horizontal movement of beds within the coal […]