The company said if Anglo proposes a formula that safeguards its full value; it will consider taking a smaller stake.

Anglo’s properties in southern Chile include the flagship expansion project Los Bronces in which the company invested $2.8bn.

Other projects include the El Soldado mine; the Chagres smelter; and the Los Sulfatos and San Enrique Monolito exploration projects.

Anglo American Sur has accounted for 41% of Anglo’s total copper production in 2010, reports Reuters.