Mar.18 (Bloomberg) --Copper stockpiles monitored by the Shanghai Futures Exchange gained after the bourse started to include two bonded warehouses as delivery points this week, according to data provided by the exchange.

Inventories rose 19,111 metric tons to 177,365 tons, based on a survey of 10 warehouses in Shanghai. The two bonded warehouses had 30,104 tons of copper as of yesterday, the exchange said on its website today.

Aluminum stockpiles dropped 10,138 tons to an 11-month low of 411,589 tons, based on a survey of 18 warehouses in Shanghai, Guangdong, Jiangsu and Zhejiang provinces.

Zinc inventories continued to expand, adding 7,863 tons to a record of 354,536 tons, based on a survey of 15 warehouses in Shanghai, Guangdong and Zhejiang, the exchange said.

Natural-rubber inventories dropped for a sixth week, losing 2,620 tons to 41,988 tons, based on a survey of 10 warehouses in Shanghai, Shandong, Yunnan, Hainan and Tianjin, the bourse said in the weekly report.