Copper had a volatile session on Wednesday, touching its lowest level in more than a week as worries over rising inventories and mounting debt snuffed out a rally inspired by a surge of new investor cash.
Benchmark copper for three-months delivery on the London Metal Exchange closed at $6,945 a tonne from a close of $6,980 on Tuesday. It earlier touched $6,874, its lowest level since Nov. 30.
Weighing on prices, stocks of copper in LME warehouses rose 5,200 tonnes to 458,500 tonnes, their highest level since late April.
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