Horizonte Minerals PLC — Proxy Solicitation & Information Statement 2021

Nov 17, 2021

Date: November 17, 2021

Computershare

100 University Avenue, 8th floor

Toronto ON, M5J 2Y1

www.computershare.com

AMENDED

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 : November 01, 2021
Record Date for Voting (if applicable) : November 01, 2021
Beneficial Ownership Determination Date : November 01, 2021
Meeting Date : December 15, 2021 - AMENDED
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	G463B6107	GB00B11DNM70

Sincerely,

Computershare

Agent for HORIZONTE MINERALS PLC