Update: The BC Coroners Service has identified the victim as Bradley Michael Thomas Haslam, aged 18, of Lumby, B.C.
"We have a group of people that provide the cleanup for the mill and he was part of that crew," Fraser said.
He could not provide further details but said about 20 workers were at the scene.
"RCMP victim services (personnel) were on site last night and Tolko's employee and family assistance program and services are being established for not only the people who were on site last night but for all of our employees," Fraser said.
He said the young man was a casual part-time worker who started at the lumber manufacturing facility in February or March.
Operations have been shut down while WorkSafeBC conducts an investigation and gives the go-ahead to restart.
The coroners service is also investigating the incident.
Tolko Industries has four mills in B.C., along with facilities in Alberta, Saskatchewan and Manitoba.
The teen's name has not been released.