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)