The most-traded October copper contract on the Shanghai Futures Exchange fell 1.3 percent to 51,030 yuan a tonne on Tuesday as investors cautious as they wait for more clues on US stimulus policy from a two-day Federal Reserve meeting starting later in the day.
"The copper market has been reluctant to rally despite news on supply disruptions," said analyst Sijin Cheng at Barclays Capital in Singapore. "The FOMC meeting is a big factor." Market volatility was likely to remain elevated until the outcome of the Fed meeting and Chairman Ben Bernanke's news conference on Wednesday.