Mayfair Gold Corp. — Proxy Solicitation & Information Statement 2026

Apr 20, 2026

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April 20, 2026

510 Burrard Street, 3rd Floor Vancouver BC, V6C 3B9 www.computershare.com

To: All Canadian Securities Regulatory Authorities New York Stock Exchange

Subject: MAYFAIR GOLD CORP.

Dear Sir/Madam:

We advise of the following with respect to the upcoming Meeting of Security Holders for the subject Issuer:

Meeting Type : Annual and Special Meeting Record Date for Notice of Meeting : May 15, 2026 Record Date for Voting (if applicable) : May 15, 2026 Beneficial Ownership Determination Date : May 15, 2026 Meeting Date : June 25, 2026 Meeting Location (if available) : Vancouver, BC Issuer sending proxy related materials directly to NOBO: No Issuer paying for delivery to OBO: No

Notice and Access (NAA) Requirements:

NAA for Beneficial Holders Yes Beneficial Holders Stratification Criteria: Not Applicable NAA for Registered Holders Yes Registered Holders Stratification Criteria: Not Applicable

Voting Security Details:

Description CUSIP Number ISIN COMMON SHARES 57808L305 CA57808L3056

Sincerely,

Computershare

Agent for MAYFAIR GOLD CORP.