MTECHTIPS- Copper trading range for the day is 389.5-399.1. Copper prices dropped in light profit-taking following several days of gains. A proposed ban on the export of copper concentrates from Indonesia is due to come into force on Jan. 12. Workers at Chile’s Escondida copper mine – the world’s biggest – have already rejected a wage offer from BHP Billiton. SELL COPPER FEB @ 396 SL 400 TGT 393.50-389 .MCX.