US copper futures lost more than 2 percent of their value at the open on Friday, weighed down by a rebound in the dollar and ongoing concerns about above-ground stock builds and uncertain demand prospects from China, the world's top copper consumer.
Copper for December delivery slipped 6.20 cents, or 2.14 percent, at $2.8340 a lb by 10:19 am EDT (1419 GMT) on the New York Mercantile Exchange's COMEX division. Range from $2.8270 to $2.9125. COMEX estimated copper volume at 11,052 lots by 10 am.