By Ed Ballard 

LONDON--Copper prices slipped on Thursday but the prospect of supply disruption kept the price near a 20-month high.

The London Metal Exchange's three-month copper contract was down 0.4% at $6,028.50 a metric ton. Other base metals were mixed.

The focus continued to be Chile's Escondida mine, majority owned by BHP Billiton Ltd., where a strike over pay has reportedly been postponed while union officials hold mediated talks with management.

"The strike has now entered its seventh day and, while parties are keen to talk to each other, it seems an agreement will take some time to reach," wrote analysts at ING.

Copper has retreated since briefly cresting $6,200 a ton for the first time since May 2015 on Monday, but remains up 9% for the year. A production outage at Freeport-McMoRan Inc.'s Grasberg mine in Indonesia because it hadn't received an export license has added to concern about a potential supply crunch.

Brokerage firm Marex Spectron said that in recent sessions buyers have stepped in whenever copper has fallen, but warned that without another upward tilt, funds that bought during the recent run-up will sell out of their positions, weighing on the price.

"Copper has looked vulnerable a few times this week on the way down but dips have held and the uptrend is still broadly intact for now," Marex wrote. However "The recent speculative longs need to see it revisit $6,200 sooner rather than later."

Aluminium was down 1% at $1,895 a ton, zinc down 0.7% at $2,850.50 a ton, lead down 0.7% at $2,304.50 a ton, nickel up 0.3% at $10,940 a ton, tin up 0.6% at $19,950 a ton.

Write to Ed Ballard at ed.ballard@wsj.com

 

(END) Dow Jones Newswires

February 16, 2017 06:52 ET (11:52 GMT)

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