Horizonte Minerals PLC — Audit Report / Information 2019

Apr 1, 2021

SNOWDEN
Horizonte Minerals Plc
NI 43-101 Technical Report – Vermelho Project, Pará State, Brazil

28.3 Simon Walsh

I, Simon Walsh, Principal Metallurgist of Simulus Pty Ltd, 82 John Street, Welshpool, Western Australia do hereby certify that:

• I am a co-author, and the overall qualified person of the technical report titled “Amended NI 43-101 Technical Report on the Vermelho Project, Pará State, Brazil” dated 31 October 2019, amended 31 March 2021 with an effective date of 31 October 2019 (the “Technical Report”) prepared for Horizonte Minerals Plc.
• I am a graduate of Murdoch University (BSc Extractive Metallurgy and Chemistry) and Curtin University (MBA), Western Australia.
• I am a Chartered Professional member in good standing of the Australasian Institute of Mining & Metallurgy (MAusIMM (CP)). My relevant experience is over 25 years in mineral processing, process engineering and extractive metallurgy.
• I have read the definition of “Qualified Person” set out in NI 43-101 (“the Instrument”) and certify that by reason of my education, affiliation with a professional association and past relevant work experience, I fulfil the requirements of a “Qualified Person” for the purposes of the Instrument.
• I am responsible for the preparation of sections 13, 17, of the Technical Report and parts of section 1 21, 25, and 26 that are pertinent to Metallurgy and Processing.
• I am independent of the issuer as defined in section 1.5 of the Instrument.
• I have no prior involvement with the property that is the subject of the Technical Report.
• I have read the Instrument and Form 43-101F1, and the Technical Report has been prepared in compliance with that instrument and form.
• As of the effective date of this Technical Report, to the best of my knowledge, information and belief, the Technical Report contains all the scientific and technical information that is required to be disclosed to make the Technical Report not misleading.

Dated at Perth, Western Australia, on 31 March 2021,

Original signed

Simon Walsh

B Sc (Extr. Met.& Chem), MBA, MAusIMM (CP), GAICD

Principal Metallurgist

Simulus Pty Ltd

Final
31 October 2019