Outburst management primarily focuses on the prevention of outbursts by pre-draining the gas from coal seams prior to mining. The aim of gas drainage is to lower the gas content of the seam below a certain threshold value, at which time it is considered safe to mine the seam. [http://outburst.uow.edu.au/gas%20threshold%20value.html] These threshold values should vary depending on the coal seam and coal measure being mined. Since the introduction of threshold values, not a single fatality due to an outburst has been recorded in Australia.