Prince George firefighters spent five hours battling yet another Canfor mill fire after a blaze broke out in a wood hopper at the Prince George Sawmill on Landooz Road on Sunday night.

Assistant fire chief Greg Wilkins said the fire was burning fiercely by the time crews arrived.

The blaze was Canfor's fourth mill fire in Prince George this year, but investigators have not indicated they have any reason to believe the fires are linked.

"Fire crews arriving at the scene found flames shooting from the top of the wood hopper, each 20 metres tall and four metres wide and deep. The bins were glowing red with heat," Wilkins said on Monday morning.

"It was a spectacular fire … but it was brought under control quickly," he said.

In January a large section of the Prince George Pulp and Paper mill was destroyed in fire.

A second massive fire in May destroyed the North Central Plywood plant.

Then in July, a fire broke out at the Intercon Pulp Mill in Prince George, but that fire was extinguished quickly.