A brown coal fire at Rowsley Station Road in Maddingley has flared up again, two days after it started.
Ten Country Fire Authority vehicles are currently attending the blaze which was listed as under control at 10.36am after being first reported just after 7.30am.
Police and the CFA have been unable to determine the cause of the fire.
Fire crews are working to extinguish a blaze that has engulfed 120 tonnes of brown coal near Bacchus Marsh, west of Melbourne.
The Country Fire Authority was called to the fire at an industrial park on Rowsley Station Road, Maddingley about 6.30am on Sunday.
A CFA spokeswoman said there were several hoppers containing coal inside an industrial building.
"One of the hoppers is fully involved with fire," she said. "The conveyor belt has also caught fire."
Firefighters have controlled the fire but crews are expected to remain on the scene for some time.
Ambulance Victoria and Victoria Police are also in attendance.