Trevali Mining Corporation — Proxy Solicitation & Information Statement 2020

Aug 15, 2020

Have questions about this notice? Call the Toll Free Number below or scan the QR code to find out more.

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Toll Free 1-866 964-0492

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www.computershare.com/ noticeandaccess

Notice of Availability of Proxy Materials for TREVALI MINING CORPORATION Annual General Meeting

Meeting Date and Location:

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When: September 16, 2020 10:00 am (Pacific Time)

Where: Virtual Meeting

You are receiving this notice to advise that the proxy materials for the above noted securityholders’ meeting are available on the Internet. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We remind you to access and review all of the important information contained in the information circular and other proxy materials before voting.

The information circular and other relevant materials are available at:

- www.trevali.com/investors/AGM Materials/default.aspx

OR www.sedar.com

How to Obtain Paper Copies of the Proxy Materials

Securityholders may request to receive paper copies of the current meeting materials by mail at no cost. Requests for paper copies may be made using your Control Number as it appears on your enclosed Voting Instruction Form or Proxy. To ensure you receive the materials in advance of the voting deadline and meeting date, all requests must be received no later than September 4, 2020. If you do request the current materials, please note that another Voting Instruction Form/Proxy will not be sent; please retain your current one for voting purposes.

For Holders with a 15 digit Control Number:

Request materials by calling Toll Free, within North America - 1-866-962-0498 or direct, from Outside of North America - (514) 982-8716 and entering your control number as indicated on your Voting Instruction Form or Proxy.

To obtain paper copies of the materials after the meeting date, please contact : +1 778-655-5885, by fax at: +1 604-608-9863 or by email: info@trevali.com. A Shareholder may also use the toll-free number 1-855-638-3690.

For Holders with a 16 digit Control Number:

Request materials by calling Toll Free, within North America - 1-866-962-0498 or direct, from Outside of North America - (514) 982-8716 and entering your control number as indicated on your Voting Instruction Form.

To obtain paper copies of the materials after the meeting date, please contact : +1 778-655-5885, by fax at: +1 604-608-9863 or by email: info@trevali.com. A Shareholder may also use the toll-free number 1-855-638-3690.

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Securityholder Meeting Notice

The resolutions to be voted on at the meeting are listed below along with the sections within the Circular where disclosure regarding the matter can be found.

1. Election of Directors

To elect the following 7 nominees to the board of directors:

Russell D. Ball Dan Isserow Aline Cote Nickola (Nick) Popovic Jill V. Gardiner Richard Williams Johannes Fredericus (Ricus) Grimbeek

See “Election of Directors” in the Circular for details.

2. Appointment of Auditors

To reappoint PricewaterhouseCoopers LLP as our auditor for the ensuing year and to authorize the directors to fix their remuneration.

See “Appointment of Auditors” in the Circular for details.

3. Advisory Vote on Executive Compensation (“ Say on Pay ”)

An advisory vote on Trevali’s approach to executive compensation. See Advisory Vote on Executive Compensation (“Say on Pay”) in the Circular for details.

Notice-and-access: Notice-and-access is a set of rules for reducing the volume of materials that must be physically mailed to shareholders by allowing issuers to post the Circular and additional materials online. Materials may be delivered electronically to shareholders. Please call Computershare toll free at 1-866-964-0492 if you have any questions about notice-and-access.

Circular: The Circular, audited financial statements, management discussion and analysis and additional materials are available on Trevali’s profile on SEDAR at www.sedar.com and on Trevali’s website at www.trevali.com. Shareholders are reminded to review these online materials before voting. Shareholders may obtain paper copies from Computershare or by contacting Trevali (in each case as described on page 1). A request for paper copies should be sent so that it is received by 10:00 a.m. (Pacific Time) on September 4, 2020 in order to allow sufficient time for the shareholder to receive the paper copy and return the proxy by its due date.

Proxy: If you are not attending the meeting, please sign, date and return the enclosed proxy (registered holders) or voting instruction form (nonregistered holders). If you designate a person to attend the meeting other than the management nominee named in the proxy, you must appoint that person as proxy to have voting rights at the meeting.

Registered holders: The enclosed proxy must be received by 10:00 a.m. (Pacific Time) on September 14, 2020 , by fax within North America to +1 (866) 249 7775 (toll free in North America), by fax outside North America to +1 (416) 263 9524, by mail or by hand to the 8th Floor, 100 University Avenue, Toronto, Ontario, M5J 2Y1.

Non-registered holders: Use the voting instruction form provided by your intermediary (bank, trust company or broker) and return it as early as practicable to ensure that it is transmitted on time. It must be received by your intermediary with sufficient time for them to file a proxy by the deadline noted above.

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Voting:

Registered holders : You may vote in person or by proxy. A proxy need not be a shareholder.

Non-registered holders : You may vote or appoint a proxy using the voting instruction form provided to your intermediary, which then, as registered shareholder, submits your vote or proxy appointment to Trevali.

You may vote by telephone or on the internet. More detailed information on voting can be found under the heading “Voting at the Meeting” in the Circular and on the enclosed proxy and voting instruction form.

PLEASE VIEW THE INFORMATION CIRCULAR PRIOR TO VOTING

Annual Financial statement delivery

• Only Registered and Beneficial holders who opted to receive one

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