Gas Threshold

In 1994 and following a fatality at West Cliff Colliery relating to an outburst incident, a notice under section 61 of the Coal Mines Regulation Act, 1982 was issued to all mines operating in the Bulli seam. This notice enforced gas threshold values on these mines to the extent that normal mining was only permitted where the total gas content of the coal proposed to be mined was less than 9 m3/tonne of CH4 or 6 m3/tonne of CO2 (See graph Opposite). Since then the operators of gassy mines outside of the Bulli seam, including Queensland producers, have successfully applied the Bulli seam protocols with some modifications. (ACARP C3079)

Threshold Limits