Tier One Silver Inc. — Proxy Solicitation & Information Statement 2025

Sep 30, 2025

TIER ONE S I L V E R

997 Seymour Street, Suite 250 - #1300
Vancouver, British Columbia V6B 3M1
Telephone No.: (778) 729-0600 Fax No.: (778) 729-0650

NOTICE OF ANNUAL GENERAL MEETING OF SHAREHOLDERS

TAKE NOTICE that the annual general meeting (the "Meeting") of shareholders of Tier One Silver Inc. (the "Company") will be held at Suite 1500, 1055 W. Georgia Street, Vancouver, British Columbia, on November 7, 2025, at 10:00 a.m. (Pacific Time) for the following purposes:

1. To receive and consider the audited consolidated financial statements of the Company for the year ended December 31, 2024, together with the auditor's report thereon and related management's discussion & analysis (see the information circular prepared for the Meeting (the "Circular"), Financial Statements);
2. To elect directors of the Company for the ensuing year (see the Circular, Election of Directors);
3. To appoint the auditor of the Company for the ensuing year (see the Circular, Appointment of Auditor); and
4. To approve the continuation of the Company's Long-term Equity Incentive Plan, as described in the Circular (see the Circular, Securities Authorized for Issuance Under Equity Compensation Plans).

No other matters are contemplated. However, any permitted amendment to or variation of any matter identified in this notice may properly be considered at the Meeting. The Meeting may also consider the transaction of such other business as may properly come before the Meeting or any adjournment thereof.

Shareholders who choose not to attend the Meeting in person and who wish to ensure their common shares are voted at the Meeting are asked to complete, date and sign the enclosed proxy, or another suitable form of proxy, and deliver it in accordance with the instructions set out in the accompanying proxy and in the Circular.

Non-registered shareholders who plan to attend the Meeting must follow the instructions set out in the form of proxy or voting instruction form to ensure their shares will be voted at the Meeting. If you hold your shares in a brokerage account you are a non-registered shareholder.

Notice-and-Access Provisions

The Company is following notice-and-access provisions of National Instrument 51-102-Continuous Disclosure Obligations and of National Instrument 54-101-Communication with Beneficial Owners of Securities of a Reporting Issuer (together the "Notice-and-Access Provisions") for this Meeting, which are a set of rules developed by the Canadian Securities Administrators, with the aim to reduce the volume of printed materials mailed to shareholders. The Company is instead allowed to post the Circular and any additional proxy materials online and shareholders will receive only this notice and the proxy (together the "notice package"). A shareholder may choose to request a paper copy of the Circular. The Company will

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not use ‘stratification’ in relation to Notice-and-Access Provisions, which occurs when an issuer using Notice-and-Access Provisions provides a paper copy of the Circular to some shareholders with the notice package. In relation to the Meeting, all shareholders will receive the notice package as required under Notice-and-Access Provisions, which will not include a paper copy of the Circular.

A copy of the Circular is posted for viewing on the Company’s website at https://www.tieronesilver.com/investors/agm-materials/ and will also be available on SEDAR+ under the Company’s profile at https://www.sedarplus.ca/. Any Shareholder who wishes to receive a paper copy of the Circular, should contact the Company via email at info@tieronesilver.com, or call Toll Free: 1-800-863-8655 or by Tel: 778-729-0600, or by Fax: 778-729-0650. A shareholder may also use the toll-free number noted above to obtain additional information about the Notice-and-Access Provisions.

Under Notice-and-Access Provisions, Meeting proxy materials must be available for viewing up to one (1) year from the date of the Meeting. A paper copy of the Circular may be requested at any time during this period. To allow time for a shareholder to receive and review a paper copy of the Circular and then submit their proxy vote by 10:00 a.m. (Pacific Time), Wednesday, November 5, 2025, a shareholder should ensure their request for a paper copy is received by the Company by October 22, 2025.

The Circular contains details of matters to be considered at the Meeting, and a copy is posted for viewing on the Company’s website at https://www.tieronesilver.com/investors/agm-materials/. Please review the Circular before voting.

DATED at Vancouver, British Columbia, as at September 24, 2025.

BY ORDER OF THE BOARD

/s/ “Peter Dembicki”

Peter Dembicki
President and Chief Executive Officer