Shanghai's benchmark third-month copper futures contract fell 1.3 percent to 70,830 yuan a tonne on Tuesday. Traders raised fresh concerns about Chinese monetary tightening - something which has caused significant price volatility since inflation and GDP data were released last week. Aluminium fell $7 to $2,406, but it was tin that was the weakest of the complex, down 1.7 percent at $27,620, trading 16 lots.
Tin is forecast to rise almost 38 percent this year from average prices in 2010, driven by dwindling reserves, rising demand, and unusually wet weather in big producer Indonesia.