rio tinto plc rio shares slid 107 to £5095 tuesday on what proved to be an allaround grim trading session for the stock market with the ftse 100 index ukx falling 043 to 766627 rio tinto plc closed £1311 below its 52week high £6406 which the company reached on january 26 trading volume 15 m remained 19 million below its 50day average volume of 34 m editors note this story was autogenerated by automated insights an automation technology provider using data from dow jones and factset see our market data terms of use