Prison transport company G4S has been fined $285,000 for its involvement in the death of Aboriginal elder Mr Ward.

Magistrate Greg Benn, who sentenced the State Government for its part in the tragedy earlier this year, said the offences and mitigating circumstances were almost identical for both organisations.

Magistrate Benn said like the Department of Corrective Services, G4S could have implemented simple safety changes that would probably have prevented Mr Ward's death.

Mr Ward died of heatstroke after being transported in the back of a prison van from Laverton to Kalgoorlie in 2008.

The Magistrate told the Court today that G4S should have ensured the air conditioning in the prison van was working and that Mr Ward could communicate with the drivers.

The Court heard he could not impose the maximum fine of $400,000 because G4S had acted swiftly to implement safety changes and pleaded guilty at the earliest opportunity.

The G4S drivers face trial later this year.

In a victim impact statement read to the court earlier today, Mr Ward's cousin Daisy said she was severely affected by his death and often felt like committing suicide.