• Ardea's development partners SMM and MC earned 17.5% equity in Kalgoorlie Nickel Pty Ltd
• Infill drilling confirms Goongarrie South as highest-grade Ni-Co deposit within KNP
• KNPL executed a Heritage Agreement with the Marlinyu Ghoorlie Native Title Claimant Group

Ardea Resources (ASX: ARL) is pleased to report on the key activities and progress made during the September 2025 Quarter, including the Kalgoorlie Nickel Project (KNP) - Goongarrie Hub Definitive Feasibility Study (DFS). Highlights include Ardea's development partners SMM and MC earning 17.5% equity in the incorporated joint venture vehicle Kalgoorlie Nickel Pty Ltd (KNPL), the release of infill drilling results confirming Goongarrie South as the highest-grade nickel-cobalt deposit within the KNP, and the execution of a Heritage Agreement with the Marlinyu Ghoorlie Native Title Claimant Group. The Company maintained its exemplary safety performance, progressed key ESG and approvals workstreams, and continued collaboration with Federal and State Governments and strategic partners. Geological work focused on resource modelling and interpretation, with the infill drilling program at Goongarrie South completed. Metallurgical testwork programs were largely completed, and process plant design and engineering work advanced. The Company also continued research and development efforts, including a global patent application for the use of Mineralised Neutraliser in the unique Ardea process.

The Company is well positioned to complete all planned work associated with the ongoing DFS, with $30M in committed funding remaining at the end of the Quarter and substantial progress made across key study areas.