The country’s production dropped 6.9% in September to 451,128 tonnes on the back of labour disruptions and falling ore grades.

New report lays out how the green energy transition “starts and ends with metals” but the required exponential growth in mining is a glaring hole in US and global decarbonisation strategies.

While construction at the QB2 copper project is two-thirds done, costs are poised to be up to 5% higher than the original $5.3bn estimate.

Output at company's founding operation is expected to drop by 15,000 ounces, to between 135,000 to 145,000 ounces.