First Mining Gold Corp. — Proxy Solicitation & Information Statement 2025

Mar 28, 2025

March 28, 2025

Computershare

510 Burrard St, 3rd Floor

Vancouver BC, V6C 3B9

www.computershare.com

To: All Canadian Securities Regulatory Authorities

Subject: FIRST MINING 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 General Meeting
Record Date for Notice of Meeting :	April 23, 2025
Record Date for Voting (if applicable) :	April 23, 2025
Beneficial Ownership Determination Date :	April 23, 2025
Meeting Date :	June 11, 2025
Meeting Location (if available) :	Vancouver, BC
Issuer sending proxy related materials directly to NOBO:	No
Issuer paying for delivery to OBO:	Yes

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	320890106	CA3208901064

Sincerely,

Computershare

Agent for FIRST MINING GOLD CORP.