Agency also cut a 2013 fine for violations to $11.5 million (7 billion Chilean pesos) from the previous $16 million it had charged Barrick Gold, but later forced to review by an environmental court.
Copper dropped 2.2 percent to $7,054.50 at 3:21 p.m. on the London Metal Exchange Tuesday. A close at that price would mark the biggest drop since Dec. 5.