MUX McEwen Mining Inc

3. To approve on an advisory (non-binding) basis the frequency upon which shareholders of the Company will be entitled to vote on the compensation of the named executive officers. 2 Years 3 Years Abstain 1 Year Proposals — The Board of Directors recommend a vote FOR all the nominees listed, FOR Proposals X – X and for every X YEARS on Proposal X. 01 - Robert R. McEwen 02 - Allen V. Ambrose 03 - Richard W. Brissenden 04 - Robin E. Dunbar 05 - Donald R.M. Quick 06 - Merri Sanchez 07 - William M. Shaver 08 - Ian Ball 01 02 03 04 05 06 07 08 Mark here to vote FOR all nominees 1UPX For All EXCEPT - To withhold a vote for one or more nominees, mark the box to the left and the corresponding numbered box(es) to the right. Mark here to WITHHOLD vote from all nominees Using a black ink pen, mark your votes with an X as shown in this example. Please do not write outside the designated areas. 03MV5I + + Proposals — THE BOARD OF DIRECTORS RECOMMENDS THAT THE SHAREHOLDERS VOTE “FOR” THE ELECTION OF EACH OF THE NOMINEES FOR DIRECTOR, AND “FOR” PROPOSALS 2, 4, 5 AND 6 AND “3 YEARS” ON PROPOSAL 3. A 1. ELECTION OF DIRECTORS: q IF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE. q Annual Meeting Proxy Card ForA gainst Abstain 2. To approve on an advisory (non-binding) basis the compensation of the Company’s named executive officers. 4. To ratify the appointment of Ernst & Young LLP as the Company’s independent registered public accounting firm for the year ending December 31, 2022. 7. To transact such other business as may properly come before the meeting. 5. To approve a proposal to grant the Board of Directors the discretion to amend the Second and Amended and Restated Articles of Incorporation to effect a reverse split of the Company’s outstanding common stock at a ratio of not less than 1-for-5 and not more than 1-for-10. 6. To approve a proposal to amend the Second Amended and Restated Articles of Incorporation to decrease the number of authorized shares of common stock from 675,000,000 to 200,000,000. ForA gainst Abstain ForA gainst Abstain ForA gainst Abstain You may vote online or by phone instead of mailing this card. Online Go to www.envisionreports.com/MUX or scan the QR code — login details are located in the shaded bar below. Save paper, time and money! Sign up for electronic delivery at www.envisionreports.com/MUX Phone Call toll free 1-800-652-VOTE (8683) within the USA, US territories and Canada Your vote matters – here’s how to vote!

Small steps make an impact. Help the environment by consenting to receive electronic delivery, sign up at www.envisionreports.com/MUX THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS The undersigned, having duly received the Notice of Annual Meeting and the proxy statement dated May 2, 2022 (as revised as of June 6, 2022), hereby revokes any and all proxies previously granted and appoints Robert R. McEwen and Carmen L. Diges or either of them, as proxies (each with the power to act alone and with the power of substitution and revocation) to represent the undersigned and to vote, as designated herein, all shares of common stock of McEwen Mining Inc. held of record by the undersigned on May 2, 2022, at the Annual Meeting of Shareholders to be held on July 7, 2022 at 11:00 a.m. Eastern Time virtually at www.meetnow.global/MJXJLV6, and at any adjournment thereof. This proxy, when properly executed, will be voted in the manner directed on the proxy by the undersigned shareholder. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED FOR THE LISTED DIRECTORS, FOR THE APPROVAL OF COMPENSATION OF THE NAMED EXECUTIVE OFFICERS, TO HOLD THE ADVISORY VOTE ON EXECUTIVE COMPENSATION EVERY THREE YEARS AND FOR THE RATIFICATION OF ERNST & YOUNG LLP AS THE COMPANY’S INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR THE YEAR ENDING DECEMBER 31, 2022, FOR APPROVAL OF THE AMENDMENT TO THE COMPANY’S SECOND AND AMENDED AND RESTATED ARTICLES OF INCORPORATION TO EFFECT A REVERSE SPLIT OF THE COMPANY’S OUTSTANDING COMMON STOC K, AND FOR APPROVAL OF THE AMENDMENT TO THE COMPANY’S SECOND AND AMENDED AND RESTATED ARTICLES OF INCORPORATION TO DECREASE THE NUMBER OF AUTHORIZED SHARES OF COMMON STOC K FROM 675,000,000 TO 200,000,000. PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY CARD PROMPTLY USING THE ENCLOSED RETURN ENVELOPE OR IF YOU ARE ELIGIBLE FOR AND PREFER INTERNET OR TELEPHONE VOTING, PLEASE RETURN YOUR PROXY BY FOLLOWING THE INSTRUCTIONS ON THE REVERSE SIDE OF THIS CARD. (Items to be voted appear on reverse side) Proxy — McEwen Mining Inc. q IF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE. q Non-Voting Items C + + Change of Address — Please print new address below. IF VOTING BY MAIL, YOU MUST COMPLETE SECTIONS A - C ON BOTH SIDES OF THIS CARD. Please sign exactly as your name appears on this card. When shares are held by joint tenants, both should sign. If signing as attorney, guardian, executor, administrator or trustee, please give full title as such. If a corporation, please sign in the corporate name by the president or other authorized officer. If a partnership, please sign in the partnership name by an authorized person. Signature 1 — Please keep signature within the box. Signature 2 — Please keep signature within the box. Date (mm/dd/yyyy) — Please print date below. Authorized Signatures — This section must be completed for your vote to count. Please date and sign below. B The 2022 Annual Meeting of Shareholders of McEwen Mining Inc. will be held on Thursday, July 7, 2022 at 11:00 a.m. ET, virtually via the internet at www.meetnow.global/MJXJLV6. 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.