Oct. 14 (Bloomberg) -- Copper stockpiles monitored by the Shanghai Futures Exchange gained after a week-long holiday, while aluminum inventories jumped 51 percent, increasing for the first time in seven months.

Copper inventories increased 1,750 metric tons to 99,661 tons, according to a survey of 10 warehouses in Shanghai, the bourse reported on its website today. Of the total, those stored at bonded warehouses added 54 tons to 13,472 tons.

Aluminum inventories surged 39,754 tons to 117,132 tons, after sinking to a four-year low, according to a survey of 20 warehouses in Shanghai, Guangdong, Jiangsu and Zhejiang provinces.

Zinc stockpiles fell 6,252 tons to 395,021 tons, based on a survey of 15 warehouses in Shanghai, Guangdong and Zhejiang, while lead stored in the warehouses declined 1,513 tons to 62,939 tons, the data showed.

Natural-rubber inventories dropped 3,485 tons to 28,331 tons, based on a survey of 10 warehouses in Shanghai, Shandong, Yunnan, Hainan and Tianjin, the bourse said in the weekly report.