Antofagasta Investor Conference Presentation Deck

Recent exploration success Group mineral resources increased by 920Mt Puerto Mejillones Antofagasta Puerto Huasco Antucoya uasco Teirina Cachorro 242Mt @1.21% Cu Vallenar 522Mt @0.65%Cu, 0.22g/t Au, 74ppm Mo Centinela Alte Del Carmen Encierro Cachorro ● • Latest Group discovery generated by our greenfield exploration programme Potential to become one of the most important manto-type deposits in the coastal metallogenic belt of northern Chile ● ● Estimated inferred resource for the central part of the deposit, represents only a part of its potential Lies between Antucoya and Centinela • Infill drilling will continue during 2023 ● ANTOFAGASTA PLC Encierro Encierro deposits is a complex Cu-Au-Mo porphyry system is one of the most important discoveries within the El Indio and Maricunga belts. Maiden inferred resources of 522Mt @ 0.79CuEq in 2022 Remains open. Further exploration is 2023 Antofagasta (57%) is forming a mining contractual company with Barrick (43%). ● ● Antofagasta plc | 2023 BMO Global Metals, Mining & Critical Minerals Conference 10

View entire presentation