Miners weigh on U.K. stocks as metals prices fall By: MarketWatch March 19, 2013 at 06:58 AM EDT Mining firms drive U.K. stocks lower on Tuesday, as metals prices drop and a Rio Tinto PLC executive warns of downward pressure on iron-ore prices. Read More >> Related Stocks: Barclays Plc ADR Bhp Billiton Ltd ADR Lloyds Banking Group Plc ADR Rio Tinto Plc ADR Royal Bank Scotland Group Plc