• Voluntary suspension of MGX shares pending announcement on impact of rockfall at Koolan Island
• Evaluating situation with external geotechnical specialists, impact on operations not yet determined
• Continuing to process stockpiled ore and load scheduled shipments

Mount Gibson Iron Ltd (MGX) has requested a voluntary suspension of its shares from quotation, effective immediately. The suspension is pending the release of an announcement by MGX regarding the impact of a rockfall on the eastern footwall (island-side) in the Main Pit at its Koolan Island operation, which was previously announced to the market on 17 October 2025. MGX is currently evaluating the situation and working with external geotechnical engineering specialists, but the extent of the likely impact on the Koolan Island operation is not yet known. In the interim, MGX continues to process stockpiled iron ore and load its immediate scheduled shipments, as well as fly personnel off the site where appropriate. MGX will provide a more detailed update on the anticipated impact of the rockfall once it has undertaken sufficient technical and economic assessment. The suspension is requested to remain in place until the earlier of MGX making a more detailed update to the market, or the commencement of trading on Friday, 24 October 2025.