By Alex MacDonald 
 

LONDON--Antofagasta PLC (ANTO.LN) reported Wednesday weaker than expected second-quarter output and cut its full-year copper production forecast due to a delay in the startup of its $1.9 billion Antucoya project.

The FTSE 100 miner reported a 7.2% rise in copper output to 157,000 metric tons in the second quarter compared with the first quarter when protests impeded copper output from 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.

First half copper production fell 12.9% on the year to 303,400 tons while gold production fell 9.1% to 112,500 troy ounces, mainly due to forecast lower grades at Los Pelambres. Only Molybdenum output increased, rising 42% on year to 4,700 tons due to higher grades mined.

The company warned that the start of production from its Antucoya project in north Chile has been delayed by about three months 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 from 695,000 tons, which in turn had already been cut from an original guidance of 710,000 tons due to the protests and heavy rainfall.

The miner also raised this year's net cash cost guidance to $1.47 a pound from $1.40/lb after taking into account lower gold and copper output as well as lower by-product prices for molybdenum and gold.

Net cash costs for the first half of the year were $1.53/lb, 4.8% higher than the same period last year largely due to lower gold production and lower realized molybdenum prices at Los Pelambres.

At 1337 GMT, Antofagasta's shares were down 2.2% at 573 pence, while the FTSE 350 mining index was broadly flat.

Citigroup said in a note that Antofagasta second-quarter production was 8% lower than Citi's estimate while second-quarter gross cash cost of $1.93/lb was 10% higher than Citi's forecast.

"We expect high-single-digit to low-teens percentage downgrades to 2015 consensus EPS" on the back of the production report, the bank noted.

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

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