An outburst at Tahmoor Colliery, in New South Wales, Australia, in June 1985 ejected 350 tonnes of coal and rock and over 3000 cubic metres of gas, killing one miner.
An outburst at Westcliff Colliery in January 1994 ejected 300 tonnes of coal and rock and killed one miner.
These include: The statistical results show that the primary factor in coal and gas outbursts is crustal stress (P), followed by sturdiness coefficient (f).
These may include: Mining under "bomb squad" or outburst conditions is no longer considered acceptable, since this method still presents a fatal risk to at least one miner.
"Bomb squad" is a special set of operating conditions that used to be adopted when it was anticipated that an outburst could occur.