BHP Billiton (BHP) may soon start axing jobs at its Worsley Alumina operations in Western Australia.
The mining giant says Worsley had moved into a stabilisation phase after completing a major expansion of its operations last year.
"With no new projects planned for the next five years, the organisational structure of Worsley is under review," a BHP spokesman said.
"There may be some impact on jobs in some areas."
There are about 2,500 workers at Worsley.
BHP will review the nature and number of roles needed to support production and ensure Worsley has a sustainable future, the spokeswoman said.
She said no operational disruptions were anticipated during the review.
The cost of expanding BHP's Worsley alumina refinery blew out due to factors including inflationary pressures and the stronger Australian dollar.