A statement from the Manildra Group Stated that there was a fire in the cleaning section of Manildra Flour Mills about 11pm on Tuesday.

"Our primary concern is the safety of our employees and the local community," the statement said.

"All employees were immediately evacuated from the site and are accounted for, and no employees were injured during the incident.

"Emergency services were deployed, and the incident has been contained."

The statement said Manildra Group is thankful to Fire and Rescue NSW, NSW Police, the Rural Fire Service and Ambulance NSW for their immediate response and assistance.

Manildra Group is currently working with Fire and Rescue NSW and the cause of the incident is unclear at this stage.

Canobolas Zone Rural Fire Service duty officer Nils Waite said seven RFS crews and two Fire and Rescue NSW crews were initially called out to the fire in a dust extraction area.

"They were working along there and they were working along a pipeline where the material gets passed through right back to [a] hopper," Mr Waite said.

"We had a shift change between 3am and 4am.

"We had a bin of flour we have to get out."

He said extinguishing the fire in the hopper was the final part of the job.

"It's just working out how to do it safely so we don't get a dust explosion," Mr Waite said.

Although this is not the first fire at the mill, Mr Waite said it is not a regular occurrence.

As at 8.30am Wednesday morning Mr Waite said there were eight Fire and Rescue NSW staff and 10 RFS volunteers still extinguishing the fire.