Copper trading range for the day is 381.3-399.3. Copper dropped as BHP Billitons Escondida mine in Chile, has resumed work as the company has requested government mediation to avoid a looming strike. The latest data from the International Copper Study Group (ICSG) showed the refined market recorded a surplus of 48,000 tonnes in October.SHFE stocks at 212,925 tonnes are down from their peak of 394,777 tonnes from late in March.