The company now holds a 75.5% interest in AAS, and the $5.39bn sale price has been paid in the form of a promissory note delivered by Mitsubishi.
AAS includes the Los Bronces and El Soldado copper mines and the Chagres copper smelter.
The proceeds of the transaction will be used by Anglo American for general corporate purposes.
Anglo American chairman John Parker said the company remains fully committed to its major inward investment programme in its Chilean business and to continuing its significant social and community investment programme in Chile.
