Fire burning at NSW aluminium factory

More than 50 firies are fighting to control a large blaze at a NSW aluminium factory.

More than 50 firies are fighting to control a large blaze at a NSW aluminium factory. (AAP)

An aluminium factory is ablaze in the NSW Hunter region.

More than 50 firefighters have descended on the Tomago fire after it was first reported about 4pm on Saturday.

About 10 fire trucks are now on site as thick, black smoke billows from the factory.

One building is well alight and crews are working to stop the large fire from spreading, a Fire and Rescue NSW spokesman told AAP.