Mr. Jeremy Martin reports

BOARD APPOINTMENTS

Horizonte Minerals PLC has appointed John MacKenzie as a non-executive director and Simon Retter as an executive director effective immediately.

John MacKenzie

Mr. MacKenzie is a senior mining executive with more than 30 years of operational and investment experience in the metals and mining sector, currently chief executive officer and director of Toronto Stock Exchange-listed Capstone Copper Corp. (current market capitalization of $3-billion (U.S.)). Previously, Mr. MacKenzie was executive chair and founder of Mantos Copper before its merger with Capstone Mining in 2022. He brings extensive operating and construction experience to the board, in particular in South American through his time as part of the Anglo American group where he was a member of the executive committee and chief executive officer of copper at Anglo American PLC, CEO of zinc at Anglo Base Metals, and general manager at its Minera Loma de Niquel mine and smelter in Venezuela, an RKEF ferronickel operation similar in design capacity to Araguaia. He was also previously a non-executive director of KAZ Minerals PLC.

Mr. MacKenzie has a master of science in mining engineering from the University of the Witwatersrand, a master of business leadership from the University of South Africa and has completed the advanced management program at Harvard Business School.

Simon Retter

Mr. Retter has served as the group chief financial officer of Horizonte Minerals since 2016. He is a commercially focused business leader with almost 15 years of experience as an executive and non-executive director focused in the natural resources sector, driving strategic growth and leading high-performance teams across various financial roles.

Mr. Retter started his career at Deloitte in assurance and advisory, qualifying as a chartered accountant before gaining extensive experience in the public markets and the mining sector, specifically, reverse takeovers, initial public offerings and secondary fundraising.

Change in company secretary

Leonardo (Leo) Neves, Horizonte's general counsel, has been appointed as company secretary, taking over from Mr. Retter effective immediately. Mr. Neves is an experienced legal professional, having developed his career at law firms Pinheiro Neto Advogados (Brazil), McMillan LLP (Canada) and Fasken Martineau LLP (United Kingdom). He has also acted in-house for various mining companies, including Ferrous Resources where he spent nine years as head of legal and company secretary. Mr. Neves holds an LLB degree from University of Brasilia (UnB) and an LLM degree from the London School of Economics and Political Science (LSE). He is qualified to practise as a solicitor in England and Wales, as well as in Brazil and Portugal.

Jeremy Martin, CEO of Horizonte, commented: "We are delighted to welcome John MacKenzie and Simon Retter to the board at this important time for Horizonte. These appointments emphasize the board's continued evolution enhancing the skill sets required to successfully deliver two Tier 1 nickel projects.

"I am confident that John's in-depth experience in the base metals sector will prove invaluable as we transition from a developer to a producer, and I look forward to continuing the great work that Simon is doing, maximizing the potential of the assets for all our stakeholders."

Regulatory

The following information is disclosed under Rule 17 of the AIM Rules for Companies and schedule two paragraph (g) of the AIM rules.

John Fraser MacKenzie (aged 55)

Mr. MacKenzie does not hold any ordinary shares nor options over ordinary shares in the company.

Current directorships    Past directorships (within the last five years)

Capstone Copper Corp.    Kaz Minerals PLC                               
Mantos Copper SA         Mantos Copper (Bermuda) Ltd.                
Mantoverde SA                                                      

There is no further information which is required to be disclosed under schedule two, paragraph (g) of the AIM Rules for Companies in respect of Mr. MacKenzie.

Simon James Retter (aged 41)

Mr. Retter holds 107,679 ordinary shares and 3,282,500 options over ordinary shares in the company.

Current directorships                       Past directorships (within the last five years)

Timpton Ltd.                                Aterian PLC                                    
CTFR Holdings Ltd.                          I-Med Group International Ltd.                  
Stonedale Management and Investments Ltd.   I-Med Medical Therapy System Ltd.
Horizonte Minerals (IOM) Ltd.               I-Med Sport Ltd.                                
HM Brazil (IOM) Ltd.                        I-Med Treasury Ltd.                             
Vox Valor Capital Ltd.                      Lan Greenfield Ltd.                             
HRC World PLC                               Lan Group PLC                                  
Adalan Ventures PLC                         MDMS Online Ltd.                                
Fragrant Prosperity Holdings Ltd.           Oplon Ltd.                                      
ElixIrr International PLC                   Skinside U.K. Ltd.                               
                                            SulNOx Fuel Fusions Ltd.                        
                                            SulNox Group PLC                               
                                            TriSkin Ltd.                                    
                                            Upham Holdings PLC                             
                                            Vertu Capital Holdings Ltd.                     
                                            I-Med Aesthetics Ltd.                           
                                            I-Med Animal Healthcare Ltd.                    
                                            I-Med Clinics Ltd.                              

Mr. Retter was a director of I-Med Group International Ltd. from May 5, 2017, until Dec. 5, 2022. I-Med Group International entered into a creditors' voluntary liquidation on June 30, 2020, with the company subsequently dissolved on Dec. 5, 2022.

There is no further information which is required to be disclosed under schedule two, paragraph (g) of the AIM Rules for Companies in respect of Mr. Retter.

About Horizonte Minerals PLC

Horizonte Minerals is developing two 100-per-cent-owned, Tier 1 projects in Para state, Brazil -- the Araguaia nickel project and the Vermelho nickel-cobalt project. Both projects are large-scale, high-grade, low-cost, have low carbon emission intensities and are scalable. Araguaia is under construction with first metal scheduled for Q1 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 produce 24,000 tonnes of nickel and 1,250 tonnes of cobalt to supply the electronic vehicle battery 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 Sarl, Glencore PLC and Orion Resource Partners LLP.

We seek Safe Harbor.