Sienna Resources Inc. — AGM Information 2023

Oct 5, 2023

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October 05, 2023

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

To: All Canadian Securities Regulatory Authorities

Subject: SIENNA RESOURCES 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 Meeting Record Date for Notice of Meeting : October 30, 2023 Record Date for Voting (if applicable) : October 30, 2023 Beneficial Ownership Determination Date : October 30, 2023 Meeting Date : December 13, 2023 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 82621E106 CA82621E1060

Sincerely,

Computershare

Agent for SIENNA RESOURCES INC.