SHANGHAI , Jan. 13-- According to the preliminary data from the General Administration of Customs, China's imports of unwrought copper and copper semis were 4200,000 mt during December , with YTD imports from January to December at 4830,000 mt up 7.4 % YoY.
    China's exports of unwrought aluminum and aluminum semis were5400,000 mt in December , with YTD exports from January to December at 4340,000 mt, up 19.2 % YoY.