Mr. Jeremy Martin reports

HORIZONTE MINERALS PLC ANNOUNCES EXERCISE OF OPTIONS AND TOTAL VOTING RIGHTS

Horizonte Minerals PLC has made an application to the London Stock Exchange for 700,000 ordinary shares to be admitted to trading on AIM following the exercise of options by optionholders. It is expected that Admission will become effective on or around 28 July 2023 and that such ordinary shares will also be listed concurrently on the Toronto Stock Exchange.

Following the issue of the new ordinary shares, the Company's issued share capital comprises 269,478,906 ordinary shares. The total number of voting rights in the Company is 269,478,906. This figure may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or change to their interest in, the share capital of the Company under the Disclosure Guidance and Transparency Rules of the Financial Conduct Authority.

ABOUT HORIZONTE MINERALS

Horizonte Minerals Plc (AIM/TSX:HZM) is developing two 100%-owned, Tier 1 projects in Para state, Brazil - the Araguaia Nickel Project and the Vermelho Nickel-Cobalt Project. Both projects are high-grade, low-cost, with low carbon emission intensities and are scalable. Araguaia is under construction with first metal scheduled for 1Q 2024. When fully ramped up with Line 1 and Line 2, Araguaia is forecast to produce 29,000 tonnes of nickel per year. Vermelho is at feasibility study stage and is expected to supply nickel to the critical metals market. Horizonte's combined production profile of over 60,000 tonnes of nickel per year positions the Company as a globally significant nickel producer. Horizonte's top three shareholders are La Mancha Investments S.a r.l., Glencore Plc and Orion Resource Partners LLP.

We seek Safe Harbor.