shares of antofagasta plc anto dropped 138 to £1611 monday on what proved to be an allaround poor trading session for the stock market with the ftse 100 index ukx falling 013 to 755449 antofagasta plc closed £227 below its 52week high £1838 which the company achieved on january 26 trading volume 401455 remained 762283 below its 50day average volume of 12 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