Troilus Mining Corporation — AGM Information 2023

Oct 6, 2023

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

October 6, 2023

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To: All Canadian Securities Regulatory Authorities

Subject: HIGHLAND COPPER COMPANY 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 : November 03, 2023 Record Date for Voting (if applicable) : November 03, 2023 Beneficial Ownership Determination Date : November 03, 2023 Meeting Date : December 13, 2023 Meeting Location (if available) : Longueuil, QC 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 43004Y101 CA43004Y1016

Sincerely,

Computershare

Agent for HIGHLAND COPPER COMPANY INC.