rio tinto plc rio shares inched up 016 to £5680 tuesday on what proved to be an allaround poor trading session for the stock market with the ftse 100 index ukx falling 061 to 752139 rio tinto plc closed £663 below its 52week high £6343 which the company achieved on march 3 trading volume 16 m remained 15 million below its 50day average volume of 31 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