Aris Mining Corporation — Proxy Solicitation & Information Statement 2026

Apr 17, 2026

April 17, 2026

Computershare 650 boulevard De Maisonneuve ouest, 7e étage Montreal (Québec), H3A 3T2 www.computershare.com

To: All Canadian Securities Regulatory Authorities

Subject: NIO STRATEGIC METALS INC.

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 : May 13, 2026 Record Date for Voting (if applicable) : May 13, 2026 Beneficial Ownership Determination Date : May 13, 2026 Meeting Date : June 17, 2026 Meeting Location (if available) : Virtual Meeting 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 No NAA for Registered Holders No

Voting Security Details:

Description	CUSIP Number	ISIN
COMMON SHARES	65445T102	CA65445T1021

Sincerely,

Computershare

Agent for NIO STRATEGIC METALS INC.