Overview Operating Review continued Mineral Resource Estimation Governance Statement All Mineral Resource estimates reported by Sunstone Metals Limited are prepared by independent, qualified mining industry professionals and in accordance with the ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves’ (the JORC Code) 2012 Edition. Competent Persons named by the Company are Members of the Australasian Institute of Mining and Metallurgy and qualify as Competent Persons as defined in the JORC Code. The Competent Persons have reviewed Sunstone’s sampling and Quality Control and Quality Assurance (QA/QC) practices to ensure samples are representative and unbiased, and that assay results are obtained with the appropriate level of confidence. Sunstone also produces internal Mineral Resource estimates synchronously with, but independent of, the Mineral Resource Estimates determined by the qualified mining industry professionals as an audit of the external result. The tables above set out Mineral Resources for 2026, with no change to the overall tonnes and grade or Mineral Resource classification from the Initial Mineral Resource reported on 22 October 2024 for El Palmar, and 24 November 2025 for Bramaderos. The potential tonnage, grade and quantity of an Exploration Target are conceptual in nature. There has been insufficient exploration to estimate a Mineral Resource for the target area reported. It is uncertain if further exploration will result in the estimation of a Mineral Resource. Competent Persons Statement The information in this report that relates to Exploration Targets and exploration results is based upon information reviewed by Dr Bruce Rohrlach who is a Member of the Australasian Institute of Mining and Metallurgy. Dr Rohrlach is a full-time employee of Sunstone Metals Ltd and has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2012 Edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves”. Dr Rohrlach consents to the inclusion in the report of the matters based on his information in the form and context in which it appears. The information in this report that relates to Mineral Resources for Bramaderos and El Palmar is based on information compiled by Mr Rob Spiers. Mr Rob Spiers is a full-time employee of Spiers Geological Consultants (SGC), and is a Member of the Australasian Institute of Geoscientists (AIG). Mr Rob Spiers has sufficient experience relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2012 Edition of the Australasian Code for the Reporting of Exploration Results, Mineral Resources and Ore Reserves (JORC Code). Mr Spiers holds 0.012% of the ordinary shares on issue of Sunstone Metals, and this shareholding does not constitute a substantial holding in the Company, nor does it impair Mr Spiers’s ability to provide an objective and unbiased assessment. The shareholding is disclosed in accordance with the JORC code transparency provisions. Mr Rob Spiers consents to the disclosure of the information in this report in the form and context in which it appears. Information on Exploration Targets Bramaderos The Bramaderos porphyry Exploration Target within the Bramaderos concession is estimated from 3 areas – the extensions to the BramaAlba system that are not captured in the Mineral Resource estimate (MRE), and mineralisation drilled at the targets of Melonal and Limon porphyry mineralisation. The Exploration Target does not include known porphyry mineralisation at Sandia, Porotillo, Playas, Copete or Yeso. It was decided to not include these areas because Sunstone has not yet completed any or sufficient drilling in these areas. Some historical drilling has been completed at Porotillo. Further work in these areas will be undertaken and they are expected to contribute to an expanded Exploration Target in future. Several areas of mineralisation have been identified outside of the area of the MRE. The MRE captured all material within a ‘Mineralisation Wireframe’, and within an economically modelled pit. Some drill holes that intersected mineralisation are outside the mineralisation wireframe, and either within or outside the pit. Inadequate drilling exists in these areas to show continuity. Furthermore, the effect of the reasonable prospects of economic extraction was to exclude 14% of material. This material has been captured in the Exploration Target. 21 Sunstone Metals Limited Annual Report 2026
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