Southern Copper — Apr 28, 2026 release

​ Michiquillay Project – Cajamarca, Peru: Michiquillay is a world-class greenfield mining project with inferred mineral resources of 2,288 million tons and an estimated copper grade of 0.43%. When developed, we expect Michiquillay to produce 225,000 tons of copper per year (along with by-products of molybdenum, gold and silver) for an initial mine life of more than 25 years. We estimate an investment of approximately $2.5 billion will be required and expect production start-up by 2032. ​ Project update: Development of the geotechnical, hydrological, and hydrogeological studies is ongoing. In addition, studies related to the Project’s reserve estimation and mine plan have commenced. ​ ​ ​ ​ 1Q26       www.southerncoppercorp.com Page 3 of 11 ​ ​ ​ ​ ​ FIRST QUARTER 2026 RESULTS SOUTHERN COPPER ​ ​ ​ ​ Mexican Projects ​ SCC has several projects in its Mexican pipeline that may boost organic growth if they are found to be of value for both stakeholders and the communities in which we operate. These projects are Angangueo, Chalchihuites and the Empalme Smelter, which are expected to bolster our position as a fully integrated copper producer. We are engaged in talks with the current administration to continue rolling out SCC’s Mexican investments for $10.2 billion. ​ El Arco - Baja California: This is a world-class copper deposit located in the central part of the Baja California peninsula with more than 1,230 million tons in sulphide ore reserves with an average ore grade of 0.40% and 141 million tons of leach material with an average ore grade of 0.27%.