Appointment of Auditor Orion Minerals Limited Incorporated in the Commonwealth of Australia Australian Company Number 098 939 274 ASX share code: ORN JSE share code: ORN ISIN: AU000000ORN1 Appointment of Auditor In accordance with ASX Listing Rule 3.16.3, Orion Minerals Limited (ASX/JSE: ORN) (Orion or the Company) advises that Mazars Melbourne Assurance Pty Ltd (Mazars Melbourne) has been appointed as auditor of the Company, following consent from Australian Securities and Investment Commission (ASIC) to the resignation of the Company's auditor, BDO Audit Pty Ltd. Mazars Melbourne has agreed to act as the Company's auditor, beginning with the financial year commencing 1 July 2023. As per the ASIC disclosure requirements, to effect the resignation, the Company provides the following information: Outgoing auditor: BDO Audit Pty Ltd. Incoming auditor: Mazars Melbourne Assurance Pty Ltd. Reason for change: The change of auditor was the result of a competitive tender process run by the Company for the provision of audit services to the Orion Group. In accordance with section 327C of the Corporations Act 2001, a resolution will be proposed to shareholders at the Company's 2024 Annual General Meeting, to ratify the appointment of Mazars Melbourne as the Company's auditor. The Board would like to take this opportunity to thank BDO Audit Pty Ltd for its past assistance and services rendered to the Company. For and on behalf of the Board. Denis Waddell Chairman 29 February 2024 ENQUIRIES Investors Media JSE Sponsor Errol Smart – Managing Director & CEO Nicholas Read Monique Martinez Denis Waddell – Chairman Read Corporate, Australia Merchantec Capital T: +61 (0) 3 8080 7170 T: +61 (0) 419 929 046 T: +27 (0) 11 325 6363 E: info@orionminerals.com.au E: nicholas@readcorporate.com.au E: monique.martinez@merchantec.com Date: 29-02-2024 08:18:00 Produced by the JSE SENS Department. The SENS service is an information dissemination service administered by the JSE Limited ('JSE'). The JSE does not, whether expressly, tacitly or implicitly, represent, warrant or in any way guarantee the truth, accuracy or completeness of the information published on SENS. The JSE, their officers, employees and agents accept no liability for (or in respect of) any direct, indirect, incidental or consequential loss or damage of any kind or nature, howsoever arising, from the use of SENS or the use of, or reliance on, information disseminated through SENS.