Southern Copper — Jul 21, 2026 release

Tia Maria - Arequipa: This greenfield project in Arequipa, Peru will use state-of-the-art SX-EW technology that meets the highest international environmental standards and has the capacity to produce 120,000 tonnes of SX- EW copper cathodes per year. Operations are expected to begin in 2H27. Project update : As of June 30, 2026, the Company has committed $1,101 million to various project activities, of which $693 million has already been invested. Mass earthworks have moved 13.85 million metric tonnes of material from the La Tapada deposit (a 71% progress). Most purchase orders for the project's major equipment have been issued. With respect to the leaching process, purchase orders have been placed for key state-of-the-art equipment, and procurement activities for the remaining major equipment continue. Regarding the power supply, electromechanical works are underway at the main electrical substations and efforts continue to build the 220-kV transmission line. Concurrently, the mass earthworks required to develop both the dry and wet areas are in their final stage. Civil works and steel structure assembly have commenced in key facilities, including the primary, secondary, and tertiary crushing circuits (dry area), as well as the Solvent Extraction (SX) and Electrowinning (EW) facilities (wet area), among others. ​ ​ ​ ​ ​ 2Q26 www.southerncoppercorp.com Page 3 of 12 ​ ​ ​ ​ ​ ​ ​ ​ SECOND QUARTER AND SIX MONTHS 2026 RESULTS SOUTHERN COPPER ​ ​ ​ ​ As of June 30, 2026