Los Bronces is one of Chile's biggest copper mines with output of 215,500 metric tons last year, as well as a key project for Anglo American, which has been a takeover target of larger rival BHP.

Chile’s environmental regulator has filed four charges against the major Los Bronces copper mine, controlled by Anglo ... in the exploration of the JOY district with Freeport.

At the time, the SMA found that Anglo American Sur, the local unit that operates Los Bronces, failed to resolve acid drainage at the Esteriles Donoso tailings deposit, designed to hold mine waste.