A worker has died at BHP Billiton's Worsley alumina refinery in Western Australia's South West after falling down an elevator shaft near a conveyor belt.
Bunbury resident Colin Whitton, 66, was fatally injured in the refinery's powerhouse, near Collie, late on Monday afternoon.
Department of Mines and Petroleum inspectors have travelled to the facility to investigate the circumstances surrounding Mr Whitton's death.
"We extend our deepest condolences and support to the deceased's family, friends and colleagues at this difficult time," BHP Billiton said.
The company is conducting its own internal investigation.