Trevali Mining Corporation — AGM Information 2021

Mar 5, 2021

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March 05, 2021

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

To: All Canadian Securities Regulatory Authorities

Subject: TREVALI MINING CORPORATION

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 01, 2021 Record Date for Voting (if applicable) : April 01, 2021 Beneficial Ownership Determination Date : April 01, 2021 Meeting Date : May 11, 2021 Meeting Location (if available) : Virtual meeting 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 89531J109 CA89531J1093

Sincerely,

Computershare

Agent for TREVALI MINING CORPORATION