Greater Sudbury Fire Services were called to a fire at 9:15 today at Vale’s Clarabelle Mill in Copper Cliff.
Plumes of dark smoke could be seen around the city.
However, Greater Sudbury Police say the fire was not considered a safety concern for citizens or traffic.
Public safety officer Leo Frappier said 30 fire fighters battled the blaze.
"We proceeded to enter the building to the upper floors of the mill and found it was a converyor belt that was on fire," he said.
"At that point, we proceeded to extinguish the fire."
Frappier said the damage is estimated to be around $2 million dollars.
Vale spokesperson Angie Robson said emergency crews responded quickly, and added the investigation for the cause of the fire is on-going.
"But it seems to have been confined to one our three crushing lines and based on that, we expect any impact to production ... to be minimal," she said.
All employees have been accounted for, she said.
In total, 120 employees were evacuated and no one was injured.