October 23, 2025

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

To: All Canadian Securities Regulatory Authorities

Subject: ARGENTUM SILVER 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 and Special Meeting Record Date for Notice of Meeting : November 17, 2025 Record Date for Voting (if applicable) : November 17, 2025 Beneficial Ownership Determination Date : November 17, 2025 Meeting Date : December 22, 2025 Meeting Location (if available) : Toronto, ON Issuer sending proxy related materials directly to NOBO: Yes Issuer paying for delivery to OBO: Yes

Notice and Access (NAA) Requirements:

NAA for Beneficial Holders No NAA for Registered Holders No

Voting Security Details:

Description CUSIP Number ISIN COMMON SHARES 04014D206 CA04014D2068

Sincerely,

Computershare

Agent for ARGENTUM SILVER CORP.