Polymetals Resources (ASX:POL) has announced that the cause of the underground explosion at the Endeavor Silver-Zinc Mine in Cobar, New South Wales, which took two lives, is still unknown.
The explosion happened around 700m underground at 3am AEDT on 28 October 2025, taking the lives of Patrick McMullen and Holly Clarke, and also injuring MacKenzie Stirling.
As reported by Mining.com.au earlier this week, McMullen was confirmed dead upon arrival of the police, while Clarke was announced dead after being brought to the surface. Stirling was airlifted to hospital for hearing damage and shock.
The incident occurred ahead of shot firing operations as a secondary detonation activity. McMullen and Clarke were both qualified shotfirers.
Operations were immediately suspended as the company continues to work with authorities. The company intends to restart operations, with exploration drilling and concentrate transport expected to begin next week.
Staff will return on Wednesday 5 November 2025, with counselling offered for returning team members.
Polymetals Executive Chairman Dave Sproule says the company is doing all it can to support those affected by the incident.
“Words fall short of how deeply affected the Polymetals’ family is by this tragic incident. The feeling of profound sadness when life is lost is never forgotten,” Sproule says.
“We’re devastated by what has happened and share our deepest thoughts and condolences with the families, their friends and our colleagues.
“The safety and well-being of our team is the company’s highest operational priority.”
Write to Maddison Elliott at Mining.com.au
Images: Polymetals Resources
