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Workers at Canada's Biggest Copper Mine Signal Possible Strike

Milena Thomas
Published Oct 21, 2026
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Summary:
  • United Steelworkers Local 7619 filed a strike notice that could halt work at Highland Valley Copper beginning no earlier than 8 a.m. on Oct. 24.
  • Teck Resources Ltd. said the mine's collective bargaining agreement expired on Sept. 30, that mining is still underway, and that it is focused on negotiating a new contract.
  • The potential stoppage adds strain to a tight global copper market and follows recent labor actions including a 10-day strike at Centinela and an eleventh-hour deal at Escondida.

What happened at Highland Valley

Employees at what the source calls Canada's biggest copper-producing mine moved to formalize a work stoppage by filing an official strike notice. The notice, from United Steelworkers Local 7619, names a possible start time of 8 a.m. on Oct. 24. Teck Resources Ltd. issued a statement on Wednesday confirming the union authorized a strike and noting the mine's prior collective bargaining agreement lapsed on Sept. 30.

Teck's response and operations

Teck said mining operations remain underway for now and that it has backup plans to maintain safety and meet environmental responsibilities if work stops. The company also said it remains focused on negotiating a new contract.

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Why this matters for your portfolio

The report links this possible stoppage to pressure on an already tight market for copper used in wiring, and to a recent rise in labor actions as prices climbed. Teck projects Highland Valley will produce 115,000 to 135,000 metric tons of copper this year, and describes the mine as an important supplier for North America, while noting it is much smaller than Escondida and Grasberg in Indonesia.

Staying on top of labor and commodity headlines is hard, so subscribe to the free Market Briefs for a clear daily update.

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