antofagasta plc anto shares dropped 115 to £1638 wednesday on what proved to be an allaround dismal trading session for the stock market with the ftse 100 index ukx falling 019 to 767689 antofagasta plc closed £200 below its 52week high £1838 which the company reached on january 26 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