Osisko Metals Incorporated — Proxy Solicitation & Information Statement 2022

May 25, 2022

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Notice of Availability of Proxy Materials for Osisko Metals Incorporated Annual and Special Meeting of Shareholders

Meeting Date and Location:

When: Thursday, June 23, 2022 at 12:00 p.m. (Montréal time)

Where: Offices of Lavery de Billy, L.L.P. Suite 4000, 1 Place Ville Marie Montréal, QC H3B 4M4 Canada

You are receiving this notification as Osisko Metals Incorporated (the “Corporation”) has decided to use the notice and access model for delivery of meeting materials to its shareholders and to advise that the proxy materials for the above noted shareholders’ 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 Management Information Circular and other proxy-related materials before voting.

The Management Information Circular and other relevant materials are available at:

www.meetingdocuments.com/TSXT/OM

OR

www.sedar.com

How to obtain paper copies of the proxy materials

Shareholders may request to receive paper copies of the current meeting materials by mail at no cost. To ensure you receive the materials in advance of the voting deadline and meeting date, all requests must be received no later than June 8, 2022. If you do request the current materials, please note that another Form of Proxy or Voting Instruction Form will not be sent; please retain your current one for voting purposes.

To obtain information about notice and access or to request paper copies of the proxy-related materials, please call TSX Trust Company, toll-free within North America at 1-888-433-6443, or email your request to tsxt-fulfilment@tmx.com.

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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 Management Information Circular where disclosure regarding the matter can be found.

1. Fix the number of directors at six (6) – Page 5

2. Election of Directors – Page 5

3. Appointment of Auditors – Page 7

4. Approval of the Amended Option Plan– Page 7

5. Approval of Glencore as a Control Person – Page 12

Voting

PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your securities you must vote using the methods reflected on your enclosed Form of Proxy or Voting Instruction Form. Your Form of Proxy or Voting Instruction Form must be received by 12:00 p.m. (Montréal time) on June 21, 2022.

PLEASE VIEW THE MANAGEMENT INFORMATION CIRCULAR PRIOR TO VOTING

Annual Financial Statements delivery

• Only to Registered and Beneficial Holders who opted to receive one.