Doman Building Materials Group — Proxy Solicitation & Information Statement 2022

May 3, 2022

MCEWEN MINING INC.

NOTICE OF ANNUAL MEETING OF SHAREHOLDERS

June 30, 2022

The 2022 annual meeting of the shareholders of McEwen Mining Inc. will be held virtually at: www.meetnow.global/MJXJLV6 on June 30, 2022 at 11:00 a.m. Eastern Time . The meeting will be held for the following purposes:

• (1) To elect eight (8) directors to serve on our Board of Directors until the next annual meeting of shareholders and until their successors are elected and qualified;

• (2) To consider and vote on an advisory (non-binding) resolution to approve the compensation of our named executive officers as described in the Compensation Discussion and Analysis, tabular disclosure and accompanying narrative disclosure set forth in our 2022 proxy statement;

• (3) To consider and vote on an advisory (non-binding) proposal to determine the frequency with which shareholders of our company shall be entitled to vote on the compensation of our named executive officers;

• (4) To ratify the appointment of Ernst & Young LLP as our independent registered public accounting firm for the year ending December 31, 2022; and

• (5) To transact such other business as may properly come before the meeting or any adjournment or postponement thereof.

These items of business are more fully described in the proxy statement accompanying this notice. The Board of Directors has fixed the close of business on April 28, 2022 as the record date for the determination of the holders of our stock entitled to notice of, and to vote at, the meeting. Accordingly, only shareholders of record on our books at the close of business on that date will be entitled to notice of and to vote at the meeting and any adjournment and postponement thereof.

This year’s annual meeting, like last year, will be a completely virtual meeting of shareholders, and will be conducted solely online. We believe the environmentally-friendly virtual meeting format will provide expanded access, improved communication and cost savings for our shareholders while also supporting public health and safety during the on-going pandemic. You will be able to attend and participate in the annual meeting online, vote your shares electronically and submit your questions prior to and during the meeting by visiting: www.meetnow.global/MJXJLV6 at the meeting date and time described in the accompanying proxy statement. You will not be able to attend the annual meeting in person.

In the event of a technical malfunction in connection with the virtual meeting, the chair of the meeting will convene the meeting at 4:00 p.m. Eastern Daylight Time on the date specified above at our corporate offices located at 150 King Street West, Suite 2800, Toronto, Ontario, Canada solely for the purpose of adjourning the meeting to reconvene at a date, time and physical or virtual location announced by the meeting chair. Under these circumstances, we will post information regarding the announcement on the investors page of our website at mcewenmining.com.

Your vote is extremely important. We appreciate you taking the time to vote promptly. After reading the proxy statement, please vote, at your earliest convenience, by telephone or Internet, or request a proxy card to complete, sign and return by mail. If you decide to attend the annual meeting online and would prefer to vote electronically during the meeting, your proxy will be revoked automatically and only your vote at the annual meeting will be counted. YOUR SHARES CANNOT BE VOTED UNLESS YOU VOTE BY: (i) TELEPHONE, (ii) INTERNET, (iii) REQUESTING A PAPER PROXY CARD, TO COMPLETE, SIGN AND RETURN BY MAIL, OR (iv) ATTENDING THE ANNUAL MEETING AND VOTING ELECTRONICALLY. Please note that all votes cast via the Internet must be cast prior to 12:00 p.m. Eastern Time on June 30, 2022 and votes cast by telephone must be cast by 1:00 a.m. on that same day.

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Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting to Be Held Virtually on June 30, 2022 at 11:00 a.m. Eastern Time.

The proxy statement and annual report to stockholders are available at http://www.envisionreports.com/MUX .

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By Order of the Board of Directors

/s/ Robert R. McEwen

May 2, 2022

ROBERT R. MCEWEN Chairman and Chief Executive Officer