SEC Form DEFA14A filed by Southern Copper Corporation

Step 1: Go to www.envisionreports.com/SCCO. Step 2: Click on Cast Your Vote or Request Materials. Step 3: Follow the instructions on the screen to log in. www.envisionreports.com/SCCO Online Go to www.envisionreports.com/SCCO or scan the QR code — login details are located in the shaded bar below. Stockholder Meeting Notice 03YXJE + + Important Notice Regarding the Availability of Proxy Materials for the Southern Copper Corporation Stockholder Meeting to be Held on May 24, 2024 Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the annual stockholders’ meeting are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and the information on the virtual meeting are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The 2024 proxy statement, proxy card and 2023 10-K report are available at: Obtaining a Copy of the Proxy Materials – If you want to receive a copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. Please make your request as instructed on the reverse side on or before May 13, 2024 to facilitate timely delivery. 2NOT Easy Online Access — View your proxy materials and vote. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Step 4: Make your selections as instructed on each screen for your delivery preferences. Step 5: Vote your shares.

Here’s how to order a copy of the proxy materials and select delivery preferences: Current and future delivery requests can be submitted using the options below. If you request an email copy, you will receive an email with a link to the current meeting materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a copy of the proxy materials. — Internet – Go to www.envisionreports.com/SCCO. Click Cast Your Vote or Request Materials. — Phone – Call us free of charge at 1-866-641-4276. — Email – Send an email to [email protected] with “Proxy Materials Southern Copper Corporation” in the subject line. Include your full name and address, plus the number located in the shaded bar on the reverse side, and state that you want a paper copy of the meeting materials. To facilitate timely delivery, all requests for a paper copy of proxy materials must be received by May 13, 2024. Southern Copper Corporation’s Annual Meeting of Stockholders will be held on May 24, 2024 at 9:00 A.M. Mexico City Time, virtually via the internet at meetnow.global/MCA7CFR To access the virtual meeting, you must have the information that is printed in the shaded bar located on the reverse side of this form. Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations. The Board of Directors recommends a vote FOR all nominees and FOR Proposals 2 and 3. 1. To elect our ten directors, who will serve until the 2025 annual meeting; 01 – German Larrea Mota-Velasco 02 – Oscar Gonzalez Rocha 03 – Vicente Ariztegui Andreve 04 – Javier Arrigunaga 05 – Enrique Castillo Sanchez Mejorada 06 – Leonardo Contreras Lerdo de Tejada 07 – Luis Miguel Palomino Bonilla 08 – Gilberto Perezalonso Cifuentes 09 – Carlos Ruiz Sacristan 10 – Jose Pedro Valenzuela Rionda 2. To ratify the selection by the Audit Committee of the Board of Directors of Galaz, Yamazaki, Ruiz Urquiza S.C., a member firm of Deloitte Touche Tohmatsu Limited, as our independent accountants for calendar year 2024; and 3. Approve by, non-binding vote, executive compensation. Note: Stockholders will also transact such other business as may properly come before the meeting and at any adjournment or postponements of the meeting. PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must go online or request a paper copy of the proxy materials to receive a proxy card. Stockholder Meeting Notice