MMO copped the fine in the Kalgoorlie Magistrates Court for the July 2015 incident at the Murrin Murrin cobalt-nickel mine in Western Australia's Eastern Goldfields that caused severe chemical burns to 20% of the workers body.
The incident on July 13 involved a piece of equipment called a Treloar arm, which is used to unload liquid anhydrous ammonia.
The worker was preparing the Treloar arm for maintenance by feeding pressurised nitrogen into it through a flexible hose, to purge the contained liquid anhydrous ammonia from the unit, when the hose ruptured.
The anhydrous ammonia spilled out and formed a vapour, which engulfed the man.
The vapour compromised his airways and caused his throat and lungs to swell, which required him to be resuscitated and hospi...