- **Ian Bucknell**, Chief Financial Officer (CFO) and Company Secretary of Ioneer Ltd, will depart the company in **mid-December 2025** to pursue other interests, after **seven years of service**.  **[1896084_0001140361-25-035847_ef20055935_ex99-1.htm:0]** 
- The company intends to **relocate the CFO role to the U.S.** to ensure strong financial leadership and cost control for the **Rhyolite Ridge Project** in Nevada, with the Company Secretarial role remaining in Australia.  **[1896084_0001140361-25-035847_ef20055935_ex99-1.htm:0]** 
- Mr. Bucknell will continue in his current roles through his contractual notice period to ensure business continuity and a smooth transition, assisting with the completion of the results season, including the **20-F for U.S. reporting purposes**, and preparation of the AGM.  **[1896084_0001140361-25-035847_ef20055935_ex99-1.htm:0]**

Ioneer Announces Chief Financial Officer Departure

- Ioneer Ltd reported a **net loss after tax of $9,554,000** for the financial year ended **June 30, 2025**, compared to $7,825,000 in the prior year, with **net assets of $230,298,000**.  **[1896084_0001140361-25-035275_ef20055695_ex99-1.htm:9]** **[1896084_0001140361-25-035275_ef20055695_ex99-1.htm:47]** 
- The company achieved significant progress on its Rhyolite Ridge Lithium-Boron Project, including receiving a favorable Record of Decision (ROD) in **October 2024**, closing an upgraded **US$996 million loan** from the U.S. Department of Energy in **January 2025**, and quadrupling its Ore Reserve to **247 million tonnes**.  **[1896084_0001140361-25-035275_ef20055695_ex99-1.htm:1]** **[1896084_0001140361-25-035275_ef20055695_ex99-1.htm:9]** 
- Project economics were reaffirmed with a **95-year mine life** and a **Net Present Value (NPV) of US$1.367 billion**, alongside **70% detailed engineering design completion**.  **[1896084_0001140361-25-035275_ef20055695_ex99-1.htm:9]** **[1896084_0001140361-25-035275_ef20055695_ex99-2.htm:26]** 
- A strategic partnering process began on **July 3, 2025**, to secure an equity partner and move towards a Final Investment Decision (FID) for the Rhyolite Ridge Project.  **[1896084_0001140361-25-035275_ef20055695_ex99-1.htm:1]**

Ioneer Ltd Reports FY2025 Results, Advances Rhyolite Ridge Project with Permitting and Funding

- Ioneer Ltd announced a **material improvement in project economics** for its Rhyolite Ridge Lithium-Boron Project, including a **38% increase in unlevered life of mine NPV to US$1,888 million** and a **16% increase in unlevered life of mine IRR to 16.8%**.  **[1896084_0001140361-25-033825_ef20055057_ex99-1.htm:0]** 
- These improvements are driven by leach optimization, leading to a **20% increase in annual lithium hydroxide production** (years 3-25) to **25,500 tpa** and a **9% increase in annual boric acid production** (years 1-25) to **126,700 tpa**.  **[1896084_0001140361-25-033825_ef20055057_ex99-1.htm:0]** 
- The enhancements were achieved with **no increase in project capital costs** and **no change to process plant design**.  **[1896084_0001140361-25-033825_ef20055057_ex99-1.htm:0]** 
- The project's estimated all-in sustaining cash cost is **US$5,626 per metric tonne lithium carbonate equivalent** for the first 25 years, positioning Ioneer in the lowest cost quartile for lithium production globally.  **[1896084_0001140361-25-033825_ef20055057_ex99-1.htm:0]** **[1896084_0001140361-25-033825_ef20055057_ex99-1.htm:4]** 
- The Rhyolite Ridge Project has an **82-year mine-life** with an Ore Reserve of **260 million tonnes**.  **[1896084_0001140361-25-033825_ef20055057_ex99-1.htm:3]** **[1896084_0001140361-25-033825_ef20055057_ex99-1.htm:5]**

ioneer (IONR)