Shanghai Futures Exchange copper on Monday slipped 0.7 percent to 46,600 yuan ($6,788) a tonne in the wake of surprise economic tightening in top consumer China. China's central bank caught financial markets off guard on Friday by raising short-term interest rates on the first day back from a long holiday, in a further sign of policy tightening as the economy shows signs of steadying. "The raising o1f rates ... surprised the market, and saw a wave of selling emerge as Chinese markets reopened after the Lunar New Year holiday," ANZ said in a report.