ACT Fire & Rescue have now extinguished a fire which started in a mulch pile at Canberra Sand and Gravel (Belconnen) this evening.
The fire covered an area of up to 30, 000 cubic meters.
The cause of the fire is believed to have been spontaneous combustion.
Fire crews will stay on scene to conduct mop-up operations and monitor the pile for possible re-ignitions.
The ACT State Emergency Service (ACTSES) are assisting operations, providing lighting and operational support.