Shanghai base metals traded mixed on Wednesday morning, as investors await a monetary policy announcement from the US Federal Reserve. Meanwhile, their counterparts on the LME were mostly higher. Shanghai base metals were mostly lower in overnight trading. Copper slid 0.69%, aluminium edged down 0.03%, lead declined 0.27% and nickel weakened 0.45%, while zinc rose 0.53% and tin increased 0.77. The LME complex performed similarly. Copper weakened 0.32%, aluminium slid 0.47%, lead shed 0.75% and nickel fell 0.16, while zinc strengthened 0.89% and tin climbed 0.52%. Copper: Three-month LME copper came off a two-week ... (full story)