US copper futures slipped at the open on Friday, as a rebound in the dollar and concerns about global demand prospects in the face of rising inventory levels pulled prices down from the prior session's three-week highs.
Copper for December delivery dipped 5.15 cents, or 1.8 percent, to $2.8470 a lb by 10:17 a.m. EDT (1417 GMT) on the New York Mercantile Exchange's COMEX division. Range from $2.8370 to $2.8915. On Thursday, December contract rallied to $2.9010, its loftiest level since September 18. COMEX estimated futures volume at 6,608 lots by 9 a.m.