A firefighter at the scene told ABC11 that a conveyer belt caught fire, however the assistant fire marshal would not confirm that information.
James Thomas did say that several fire crews from nearby areas were called in to help. It took crews 30 minutes to extinguish the blaze.
He also said no one was at the site at the time the fire broke out.
Thomas would not say if it was an arson, only that the blaze is under investigation.