Competent Persons And Compliance Statements The Company’s Ore Reserves and Mineral Resources Statement is based on information first reported in previous ASX announcements by the Company. These announcements are listed below and are available to view on Sheffield’s website www.sheffieldresources.com.au. Mineral Resources and Ore Reserves reported for the Dampier Project are prepared and disclosed under the JORC Code 2012. Other than known and reported mine operating cost increases as a result of increased induration and inflationary cost pressures, the Company confirms that it is not aware of any new information materially affecting the information included in the relevant original market announcements and that all material assumptions parameters underpinning the estimates in the relevant original market announcement continue to apply and have not materially changed. The information in this report that relates to Ore Reserves is based on information and supporting documentation prepared by Mr. Per Scrimshaw. Mr. Scrimshaw is a Member of The Australasian Institute of Mining and Metallurgy. Mr. Scrimshaw is employed by Entech, a mining consultancy engaged by KMS to prepare Ore Reserves estimation for the Thunderbird Project. Mr. Scrimshaw has sufficient experience that is relevant to the style of mineralisation and type of deposit under consideration and to the activity being undertaken 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’. Mr Scrimshaw has visited the Thunderbird site on multiple occasions, the most recent being in August 2025. During this visit Mr Scrimshaw viewed the active mining areas, processing and tailings facilities. Mr Scrimshaw also met with key KMS operational personnel tasked with mining, geology and processing aspects at the Thunderbird site and collated supporting information and data to support this Ore Reserve estimate update. Mr Scrimshaw 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 the estimation of the Mineral Resources is based on information compiled by Mrs Christine Standing, a Competent Person who is a Member of the Australian Institute of Geoscientists (AIG). Mrs Standing is an employee of Datamine Australia Pty Ltd (Snowden Optiro) and has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which she 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’. Mrs Standing consents to the inclusion in this report of the matters based on her information in the form and context in which it appears. The Competent Persons for reporting of Mineral Resources and Ore Reserves in the relevant original market announcements are listed below. The Company confirms that the form and context in which the Competent Persons’ findings are presented have not been materially modified from the relevant original market announcement. Supporting Information Required Under Asx Listing Rules, Chapter 5 The supporting information below is required, under Chapter 5 of the ASX Listing Rules, to be included in market announcements reporting estimates of Mineral Resources and Ore Reserves. Previously Reported Information This report includes information that relates to Exploration Results, Mineral Resources and Ore Reserves prepared and first disclosed under the JORC Code 2012 and a Bankable Feasibility Study. The information was extracted from the Company’s previous ASX announcements as follows: – Mineral Resource and Ore Reserve Statement: “MINERAL RESOURCE AND ORE RESERVE STATEMENT” 24 September 2019 – Thunderbird Ore Reserve Update: “THUNDERBIRD ORE RESERVE UPDATE” 24 March 2022 – Thunderbird BFS Update: “THUNDERBIRD BFS, FINANCING AND PROJECT UPDATE”, 24 March 2022 – Night Train Inferred Resource and Mineral Assemblage results “HIGH GRADE MAIDEN MINERAL RESOURCE AT NIGHT TRAIN” 31 January 2019 – Thunderbird Mineral Resource: “SHEFFIELD DOUBLES MEASURED MINERAL RESOURCE AT THUNDERBIRD” 5 July 2016 – Thunderbird drilling: “EXCEPTIONALLY HIGH GRADES FROM INFILL DRILLING AT THUNDERBIRD MINERAL SANDS PROJECT” 9 February 2015 These announcements are available to view on Sheffield’s website at www.sheffieldresources.com.au. The Company confirms that it is not aware of any new information or data that materially affects the information included in the relevant market announcements, other than known reported mine operating cost increases as a result of increased induration and inflationary cost pressures and, in the case of estimates of Mineral Resources and Ore Reserves, that all material assumptions and technical parameters underpinning the estimates in the relevant market announcement continue to apply and have not materially changed. The Company confirms that the form and context in which the Competent Persons’ findings are presented have not been materially modified from the relevant original market announcements. Ore Reserves and Mineral Resources continued 38 Sheffield Resources Limited Annual Report 2025
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