Southern Copper — Oct 28, 2025 release

To the fullest extent possible, we intend to fill the 3,500 jobs estimated to be required during Tia Maria ´ s construction phase with workers from the Islay province. In 2027, when we start operations, the project will generate 764 direct jobs and 5,900 indirect jobs. In the early construction phase, progress on access roads and platforms stands at 90%. We will advance these efforts alongside work to set up a temporary camp; engage in massive earthworks; and roll out mine-opening activities. As of October 14, 2025, the Company received from the Ministry of Energy and Mines an authorization for the commencement of exploitation activities for the Tía María project. This authorization is based on the considerations ​ ​ 3Q25       www.southerncoppercorp.com Page 3 of 12 ​ ​ ​ ​ ​ ​ ​ ​ ​ THIRD QUARTER AND NINE MONTHS 2025 RESULTS SOUTHERN COPPER ​ ​ ​ ​ outlined in the supporting technical report and the environmental certification approved for the project. Consequently, we will soon initiate pre-stripping activities in La Tapada, and begin building main project components. Los Chancas - Apurimac: This greenfield project, located in Apurimac, Peru, is a copper and molybdenum porphyry deposit. Current estimates of indicated copper mineral resources are 98 million tonnes of oxides with a copper content of 0.45% and 52 million tonnes of sulfides with a copper content of 0.59%. The Los Chancas project envisions an open-pit mine with a combined operati