Copper stockpiles monitored by the Shanghai Futures Exchange jumped 12 percent to the highest level since May, while aluminum inventories tumbled to a 20-month low.
Copper stockpiles increased 9,297 metric tons to 90,089 tons, according to a survey of 10 warehouses in Shanghai, the bourse said on its website today. Inventories in two bonded warehouses dropped 1,373 tons to 21,637 tons.
Aluminum inventories declined for a 16th week, losing 15,878 tons to 254,617 tons, the lowest level since October 2009, according to a survey of 20 warehouses in Shanghai, Guangdong, Jiangsu and Zhejiang provinces.
Zinc stockpiles fell 181 tons to 400,768 tons, based on a survey of 15 warehouses in Shanghai, Guangdong and Zhejiang, while lead stored in the warehouses rose 5,545 tons to 47,884 tons, the data showed.
Natural-rubber inventories gained for a fifth week, rising 1,350 tons to 14,357 tons, based on a survey of 10 warehouses in Shanghai, Shandong, Yunnan, Hainan and Tianjin, the bourse said in the weekly report.
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