Taseko said although production from its Gibraltar mine had not been affected, damage to rail and highway infrastructure had prevented shipment of copper concentrate to the port of Vancouver over the past two weeks.

"Rail service is now resuming and is expected to gradually return to normal, but the recent disruptions will impact fourth quarter sales volumes which could be significantly lower than copper production for the period," said Taseko's CEO Stuart McDonald.

McDonald added any excess concentrate inventory at year-end would be sold in the first quarter of 2022.

Taseko also said it had struck a new labour agreement with union workers at Gibraltar out to 2024.

Shares in the company were trading at 154p on Tuesday afternoon in London. Taseko is capitalised at US$573 million.