The most-traded October copper contract on the Shanghai Futures Exchange sank 1 percent to 49,790 yuan ($8,103) a tonne on Friday. Copper prices fell further below $7,000 to a one-week low on Thursday with prospects for further weakness ahead as swelling mine supply is expected to eclipse a modest demand revival into the end of the year.
"Demand slipped a bit month-on-month in August due to slower growth in the white goods sector, but there might be some short-term restocking demand before the national holiday in October," said analyst Li Chunlan of consultancy CRU in Beijing.