By David Winning

SYDNEY--Rio Tinto PLC downgraded its guidance for annual production of refined copper following setbacks at its Kennecott mine in Utah.

Rio Tinto said it now expects to produce between 135,000 and 175,000 metric tons of copper in the 12 months through December, down from an earlier forecast of 165,000-205,000 tons.

Rio Tinto said it has experienced delays to the restart of the smelter at the Kennecott operation, citing "unexpected issues that appeared following planned maintenance."

"We are working closely with our customers to limit any disruptions and expect to have the smelter fully operational in two months," Rio Tinto said.

Write to David Winning at david.winning@wsj.com

(END) Dow Jones Newswires

August 18, 2020 18:41 ET (22:41 GMT)

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