By Alex MacDonald

LONDON--Antofagasta PLC (ANTO.LN) said Wednesday its copper output increased in the second quarter from the first quarter, but it lowered its full-year copper production forecast due to issues in commissioning its Antucoya project.

The FTSE 100 miner reported a 7.2% rise in copper output to 157,000 tons in the second quarter compared with the first quarter when water scarcity-related protests impeded production at its flagship Los Pelambres mine and subsequent heavy rains affected output from its Centinela mine.

"Whilst we have seen a positive recovery from these disruptions, overall performance during the first half of the year has not been as good as originally expected," said Chief Executive Diego Hernandez.

Copper production in the first half fell 12.9% on the year to 303,400 tons mainly due to forecast lower grades at Los Pelambres.

The company also said that first production at its Antucoya project has been delayed until the end of the third quarter due to issues with the commissioning of the crusher circuit.

As a result, the group reduced its full-year copper production forecast to 665,000 tons. It also updated its net cash cost to $1.47 a pound, reflecting lower gold and copper output and lower by-product prices, particularly for molybdenum and gold.

Write to Alex MacDonald at alex.macdonald@wsj.com

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