Electrical contractor Anthony Eames suffered severe burns to more than 40% of his body at Griffin Coal’s Ewington trial char plant near Collie in 2008.

The trial coal-drying and char plant was being operated by Carpenter Mine Management, which pleaded guilty at Bunbury Magistrate's Court on Tuesday for failing to provide and maintain a safe working environment.

An investigation by the state Department of Mines and Petroleum found oxygen levels were too high for the plant to be operated safely without a fire or explosion.

In addition to seriously injuring Eames, the explosion damaged various infrastructure and equipment within the plant.

When handing down the $100,000 fine, Bunbury Magistrate Elizabeth Hamilton said she accepted Carpenter Mine Management was aware of the risk of fire and explosion.

DMP Resources safety executive director Simon Ridge said he welcomed the sentence.

“This was a terrible incident for Mr Eames, his family and work colleagues – so it is crucial companies that aren’t following safety procedures are brought to account,” Ridge said.

“Most companies operate to high safety standards but there are always further improvements that can be made to make WA’s resources industry even safer.

“That’s why government and industry must work together.”

According to DMP spokeswoman Samantha Cairns, the charge was the only one laid against Carpenter Mine Management.

The case against Griffin Coal has been discontinued.