Copper miners weigh in lower FTSE 100 By: MarketWatch May 14, 2010 at 04:38 AM EDT Losses for Xstrata, Kazakhmys and Antofagasta all weigh on the U.K.'s top share index as investors fret about demand trends. Read More >> Related Stocks: Barclays Plc ADR Bhp Billiton Ltd ADR Lloyds Banking Group Plc ADR Rio Tinto Plc ADR