Jan 1 (Reuters) - Canada-based Capstone Copper (CS.TO) , opens new tab said on Thursday that a union representing about half the workers at its Mantoverde copper and gold mine in Chile and roughly 22% of the company's total workforce will launch a strike on January 2.

The copper miner said it had sought to reach a new collective bargaining agreement before the strike notice and will gradually scale down operations at the mine in a safe manner. Output is expected to run at up to 30% of normal levels during the stoppage, it added.

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Capstone said it remains open to talks to resolve the dispute.

Mantoverde is 70% owned by Capstone and 30% by Mitsubishi Materials (5711.T) , opens new tab. The mine is forecast to produce between 29,000 and 32,000 metric tons of copper cathodes in 2025.

https://www.reuters.com/sustainability/sustainable-finance-reporting/capstone-copper-faces-strike-mantoverde-mine-chile-2026-01-02/