The Construction, Forestry, Mining and Energy Union says John Holland was not fined enough over the death of a worker in 2009.
The West Australian reports CFMEU WA Secretary Mick Buchan said the $242,000 fine was worth little more than a single worker’s annual salary in the mining industry.
Buchan told The West Australian he supported a bill by Greens MP Alison Xamon to introduce the charge of industrial manslaughter.
Under the proposed law negligent bosses could be jailed for 20 years and the maximum fine would be $3.75 million.
John Holland was fined $242,000 over the death of a worker at the Mt Whaleback mine, the maximum penalty under the Commonwealth OHS Act.
Yesterday Comcare, the safety regulator that prosecuted the company, said future fines would be much higher after the introduction of new laws this year.
"Had this incident occurred under those laws, the penalties would have been much higher," it said.