By Katherine Dunn 

LONDON--Copper prices fell on Thursday as weak demand outweighed lingering supply concerns over mine closures in Chile and Indonesia.

The three-month London Metal Exchange copper price was down 0.90% at $5,973 per metric ton in midmorning trade on Thursday.

"Supply side concerns are still supporting prices, but physical buying is quiet," said Robin Bhar, an analyst at Société Générale.

In Chile, the union strike at the Escondida mine, the world's largest copper mine, is about to enter its third consecutive week. After 30 days workers can return individually back to work. The mine is majority-owned by BHP Billiton Ltd.

There are still no signs of agreement between the workers and management, said Commerzbank in a note. The bank estimated that the two weeks of striking had taken 41,000 tons of copper out of the supply chain.

A dispute over an export license for Freeport-McMoRan Inc.'s Grasberg mine in Indonesia has also stifled production.

However, those concerns have been dampened by weak demand and ample stockpiles, noted Mr. Bhar. Analysts and traders are now waiting to see how long the strike at the Escondida mine lasts.

Nickel has also been affected by concerns about future supply, after the government of the Philippines said it would close 23 mines and suspend another five.

On Thursday, the technical working group of the country's Mining Industry Coordinating Council (MICC), said it would launch a program in response to complaints by the mining industry about the suspensions.

All the base metals were lower. Nickel was down 0.84% at $10,640 per metric ton, aluminum was down 0.74% at $1,879 per ton, lead was down 0.75% at $2,263.50 per ton, zinc was down 1.12% at $2,826 per ton, and tin was down 0.75% at $19,150 per ton.

Cris Larano contributed to this article.

Write to Katherine Dunn at Katherine.Dunn@wsj.com

 

(END) Dow Jones Newswires

February 23, 2017 06:54 ET (11:54 GMT)

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