(Reuters) - Miner Fresnillo <FRES.L> cut its output targets for 2019, citing lower-than-expected ore grades and delays in construction at its Herradura gold mine in Mexico after reporting a drop in second-quarter output from a year earlier.
The FTSE 100-listed company cut its 2019 gold production forecast to 880,000-910,000 ounces from a prior target of 910,000-930,000 ounces and silver production to 55-58 million ounces from 58-61 million ounces.
Fresnillo had said in May that 2019 would be more challenging than 2018 and that it was disappointed in not having met its long-term silver target of 65 million ounces.
The company on Wednesday reiterated the warning and said adjusted production costs for the first half was expected to be $135 million more than the same period a year ago due to lower ore grades and hurdles at its Herradura gold mine.
Fresnillo, Mexico's largest gold producer, said gold production fell 5.4% to 221,307 ounces for the three months ended June 30, while silver production was 6% lower at 14.4 million ounces.
Premarket indicators have pegged the company's shares to fall 4-5% at markets open.
(Reporting by Muvija M in Bengaluru; editing by Patrick Graham and Arun Koyyur)