Comex copper futures ended lower on Thursday, while London copper prices too fell from multi-year peaks as some investors locked in profits from a steep rally amid doubts about future demand in top metals consumer China. Further, minutes from the US Federal Reserve, released on Wednesday evening, in which policymakers voiced concern over weak US inflation, clouding the outlook for the world's largest economy, too weighed on copper prices.

Copper futures for September delivery lost 0.5 percent to settle at $2.938 a pound on the Comex metals division of New York Mercantile Exchange. While, copper on the London Metal Exchange ended down 0.6 percent at $6,490 a metric ton.

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