According to early reports from the United Steelworkers, a 36-year-old industrial mechanic was killed when a pin broke on a crusher and was released under high pressure.
A 28-year-old worker was injured and brought to hospital, where he remains under observation as of Monday afternoon.
Last week the Ministry of Labour held public consultations in Sudbury for its year-long review of mining health and safety.
The review has a mandate to focus on six main topics: the role of health and safety system partners; the internal responsibility system; technology and the management of change; training, skills and labour issues; health and safety hazards in the mining sector; and emergency preparedness and mine rescue.
The review will recommend amendments to government regulations where appropriate.