Southern Copper — Oct 28, 2025 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. Tia Maria will generate significant revenues for the Arequipa region from day one of its operations. At current copper prices, we expect to export $18.2 billion and contribute $3.8 billion in taxes and royalties during the first 20 years of operation. The project budget has been set at $1,802 million. Project update: As of September 30, 2025, progress at Tia Maria stood at 23% and 2,109 new jobs had been generated; 809 of these positions were filled with local applicants. 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 supp