Liquid brass - a mixture of copper and zinc - is poured into moulds in the foundry at the copper mining and smelting complex, operated by RBT Bor Group, in Bor, Serbia, on Friday, Aug. 24, 2012. Copper declined, trimming a third weekly advance, on concerns over the progress in solving Europe's debt crisis, disappointing U.S. data and further tightening measures in China's property market. Photographer: Oliver Bunic/Bloomberg via Getty Images
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