Copper fell for the sixth straight session on Monday to a one-month low after a credit agency's negative credit outlook for the United States added to concerns about demand prospects. COMEX May copper dropped 5.95 cents, or 1.4 percent, to settle at $4.1980 per lb, near the bottom of its $4.1720 to $4.2880 session range.
Trading volumes picked up in the sell-off, with a little more than 61,600 lots traded by 2:05 pm EDT (1805 GMT), about 35 percent above the 30-day average, according to preliminary Thomson Reuters data.