Copper prices fell to the lowest level in nearly two months as worries about the impact of a fraud investigation in China's metals industry continued to gnaw on the market.
Copper for July delivery, the most active contract, fell 2.5 cents, or 0.8 per cent, to $US3.0155 a pound on the Comex division of the New York Mercantile Exchange.
This was the lowest settlement since April 15, when futures closed at $US2.9875 a pound.
Investors have been selling their copper holdings in recent days amid reports that metal stored in China's third-largest port, Qingdao, was potentially used as collateral for multiple loans from several banks.
Chinese authorities last week closed the port to new imports of aluminum and copper as they investigate irregularities in connection with warehouse practices.
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