Horizonte Minerals PLC — Proxy Solicitation & Information Statement 2022

Oct 4, 2022

Date: October 4, 2022

Computershare

100 University Avenue, 8th floor

Toronto ON, M5J 2Y1

www.computershare.com

To: All Canadian Securities Regulatory Authorities

Subject: HORIZONTE MINERALS PLC

Dear Sir/Madam:

We advise of the following with respect to the upcoming Meeting of Security Holders for the subject Issuer:

Meeting Type : Special Meeting
Record Date for Notice of Meeting : October 5, 2022
Record Date for Voting (if applicable) : October 5, 2022
Beneficial Ownership Determination Date : October 5, 2022
Meeting Date : November 4, 2022
Meeting Location (if available) : London, UK
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
ORDINARY SHARES	G463B6149	GB00BMXLQJ47

Sincerely,

Computershare

Agent for HORIZONTE MINERALS PLC