# EDGAR Filing Document

**Accession Number:** 0001896084
**File Stem:** 0001140361-25-021036
**Filing Date:** 2025-6
**Character Count:** 26236
**Document Hash:** e0a6b62d8ca2511d5dce8c116120c03f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-25-021036.hdr.sgml**: 20250602

**ACCESSION NUMBER**: 0001140361-25-021036

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 31

**CONFORMED PERIOD OF REPORT**: 20250602

**FILED AS OF DATE**: 20250602

**DATE AS OF CHANGE**: 20250602

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ioneer Ltd
- **CENTRAL INDEX KEY:** 0001896084
- **STANDARD INDUSTRIAL CLASSIFICATION:** MINING, QUARRYING OF NONMETALLIC MINERALS (NO FUELS) [1400]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** C3
- **FISCAL YEAR END:** 0630

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41412
- **FILM NUMBER:** 251013260

**BUSINESS ADDRESS:**
- **STREET 1:** 140 ARTHUR STREET
- **STREET 2:** SUITE 5.03, LEVEL 5
- **CITY:** NORTH SYDNEY
- **STATE:** C3
- **ZIP:** NSW 2060
- **BUSINESS PHONE:** 61(2)99225800

**MAIL ADDRESS:**
- **STREET 1:** 140 ARTHUR STREET
- **STREET 2:** SUITE 5.03, LEVEL 5
- **CITY:** NORTH SYDNEY
- **STATE:** C3
- **ZIP:** NSW 2060

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#### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

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### <br>

### FORM 6-K

### <br>

#### REPORT OF FOREIGN PRIVATE ISSUER

#### Pursuant to Rule 13a-16 or 15d-16 of the

#### Securities Exchange Act of 1934

#### For the month of June 2025
**Commission File Number:**001-41412

**** 

<br> ------

## ioneer Ltd
(Translation of registrant's name into English)

#### <br>

#### Suite 16.01, 213 Miller Street

#### North Sydney, NSW, 2060, Australia
(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

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#### EXHIBIT INDEX
The following exhibits are filed as part of this Form 6-K:

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| | |
|:---|:---|
| Exhibit | Description |
| [99.1](ef20050051_ex99-1.htm) | Press Release |
| [99.2](ef20050051_ex99-2.htm) | Investor Presentation |

---

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#### SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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| | | |
|:---|:---|:---|
|  | ioneer Ltd | ioneer Ltd |
|  | (registrant) | (registrant) |
| Date: June 2, 2025 | By: <br>| <u>/s/ Ian Bucknell</u> |

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Name: <br> Ian Bucknell <br> Title: <br> Chief Financial Officer & Company Secretary

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## Exhibit 99.1

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#### Exhibit 99.1<br>

#### <br>

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| | | |
|:---|:---|:---|
| ![](image00032.jpg) | ![](image00001.jpg) | Suite 16.01<br> Level 16, 213 Miller Street<br> North Sydney NSW 2060<br> **www.Ioneer.com** |

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Investor Webinar following Ore Reserve Upgrade and Updated Economics Announcement

**SYDNEY, Australia – 2 June 2025** – **Ioneer Ltd ("Ioneer") (ASX: INR, NASDAQ: IONR)** invites investors to join a conference call with company management following the announcement of the Rhyolite Ridge Project Ore Reserve estimate quadrupling and release of robust Project economics.

#### Analyst and Investor Briefing

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| | |
|:---|:---|
| **Event:** | **Ioneer Ltd (ASX:INR, NASDAQ: IONR) Investor Conference Call** |
| **Date/Time:** | **Today, Monday 2 June 2025 at 12.00 noon AEST (10pm ET)** |
| **Presenters:** | **Bernard Rowe (Managing Director)** |

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Webinar

To register for the webinar, please follow this link:

<u>https://us02web.zoom.us/j/81292143931</u>

A replay of the conference call will also be available on request and at the Company website.

This ASX release has been authorised by Ioneer Managing Director, Bernard Rowe.

--**ENDS**--

Investor Relations

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| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp; **Chad Yeftich**<br> **Ioneer USA Corporation** | &nbsp;&nbsp;&nbsp; **Ian Bucknell**<br> **Ioneer Limited** |
| &nbsp;&nbsp;&nbsp; Investor Relations (USA)<br> T: +1 775 993 8563<br> E: <u>ir</u><u>@ioneer.com</u> | &nbsp;&nbsp;&nbsp; Investor Relations (AUS)<br> T: +61 434 567 155<br> E: <u>ibucknell</u><u>@ioneer.com</u> |

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Media Relations

#### Daniel Francis, FGS Global
E: <u>daniel.francis@fgsglobal.com</u>

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| | |
|:---|:---|
| ![](image00002.jpg) | **ABN** 76 098 564 606<br> **ASX:** INR<br> **Nasdaq:** IONR |

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**---

| | | |
|:---|:---|:---|
| ![](image00034.jpg) | ![](image00003.jpg) | Suite 16.01<br> Level 16, 213 Miller Street<br> North Sydney NSW 2060<br> www.Ioneer.com |

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**

#### <br>

#### About Ioneer
Ioneer Ltd is an emerging lithium–boron producer and the 100% owner of the Rhyolite Ridge Lithium-Boron Project. Rhyolite Ridge is the only known lithium-boron deposit in North America, one of only two known such deposits in the world and a linchpin project in Nevada's burgeoning Lithium Loop.

Rhyolite Ridge closed a US$996 million loan with the U.S. Department of Energy Loan Programs Office under the Advanced Technology Vehicles Manufacturing program in January 2025. In October 2024, Ioneer received the final federal permit for the project from the Bureau of Land Management, concluding the formal federal permitting process which began in early 2020. Ioneer signed separate offtake agreements with Ford Motor Company and Prime Planet & Energy Solutions (joint venture between Toyota and Panasonic) in 2022 and Korea's EcoPro Innovation in 2021.

To learn more about Ioneer, visit <u>www.Ioneer.com/investors</u> or join our online communities on <u>X</u>, Facebook, <u>LinkedIn</u>, <u>Instagram</u> and <u>YouTube</u>

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| | | |
|:---|:---|:---|
| 2 | ![](image00002.jpg) | **ABN** 76 098 564 606<br> **ASX:** INR<br> **Nasdaq:** IONR |

---

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## Exhibit 99.2

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#### Exhibit 99.1

#### <br>
![](image0001.jpg)

1 B Li INVESTOR PRESENTATION June 2, 2025 : IONR www.ioneer.com ASX : INR Rhyolite Ridge Project Reserve & Economics Update

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![](image0002.jpg)

Disclaimer INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 4 This presentation has been prepared as a summary only and does not contain all information about ioneer Ltds (ioneer or the Company) assets and liabilities, financial position and performance, profits and losses, prospects, and the rights and liabilities attaching to ioneer's securities. The securities issued by ioneer are considered speculative and there is no guarantee that they will make a return on the capital invested, that dividends will be paid on the shares or that there will be an increase in the value of the shares in the future. ioneer does not purport to give financial or investment advice. No account has been taken of the objectives, financial situation or needs of any recipient of this presentation. Recipients of this presentation should carefully consider whether the securities issued by ioneer are an appropriate investment for them in light of their personal circumstances, including their financial and taxation position. Investors should make and rely upon their own enquiries before deciding to acquire or deal in the Company's securities. Forward Looking Statements Various statements in this presentation constitute statements relating to intentions, future acts and events which are generally classified as "forward looking statements". These forward-looking statements are not guarantees or predictions of future performance and involve known and unknown risks, uncertainties and other important factors (many of which are beyond the Company's control) that could cause those future acts, events and circumstances to differ materially from what is presented or implicitly portrayed in this presentation. For example, future reserves described in this presentation may be based, in part, on market prices that may vary significantly from current levels. These variations may materially affect the timing or feasibility of particular developments. Words such as "anticipates", "expects", "intends", "plans", "believes", "seeks", "estimates", "potential" and similar expressions are intended to identify forward-looking statements. ioneer cautions security holders and prospective security holders to not place undue reliance on these forward- looking statements, which reflect the view of ioneer only as of the date of this presentation. The forward-looking statements made in this presentation relate only to events as of the date on which the statements are made. Except as required by applicable regulations or by law, ioneer does not undertake any obligation to publicly update or review any forward-looking statements, whether as a result of new information or future events. Past performance cannot be relied on as a guide to future performance. Competent Persons Statement In respect of Mineral Resources and Ore Reserves referred to in this presentation and previously reported by the Company in accordance with JORC Code 2012, the Company confirms that it is not aware of any new information or data that materially affects the information included in the public reports titled "February 2025 Mineral Resource Estimate" dated 5 March 2025 and "Ore Reserve Quadruples; Reaffirms Robust Project Economics" dated 2 June 2025, released on ASX. Further information regarding the Mineral Resource estimate and Ore Reserve can be found in those reports. All material assumptions and technical parameters underpinning the estimates in the reports continue to apply and have not materially changed. In respect of production targets referred to in this presentation, the Company confirms that it is not aware of any new information or data that materially affects the information included in the public report titled "Ore Reserve Quadruples; Reaffirms Robust Project Economics" dated 2 June 2025. Further information regarding the production estimates can be found in that report. All material assumptions and technical parameters underpinning the estimates in the report continue to apply and have not materially changed. No offer of securities Nothing in this presentation should be construed as either an offer to sell or a solicitation of an offer to buy or sell ioneer securities in any jurisdiction or be treated or relied upon as a recommendation or advice by ioneer. Reliance on third party information The views expressed in this presentation contain information that has been derived from publicly available sources that have not been independently verified. No representation or warranty is made as to the accuracy, completeness or reliability of the information. This presentation should not be relied upon as a recommendation or forecast by ioneer. Lithium Carbonate Equivalent The formula used for the Lithium Carbonate Equivalent (LCE) values quoted in this presentation is: LCE = (lithium carbonate tonnes produced + lithium hydroxide tonnes produced \* 0.880 Note All $'s in this presentation are US$'s except where otherwise noted.

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![](image0003.jpg)

Rhyolite Ridge Project Update A unique lithium-boron deposit of strategic importance to the U.S. Rhyolite Ridge Ore Reserve more than quadrupled from 60 to 247 million tonnes underpinning a mine life of 95 years All-in sustaining cash cost places the Project in the bottom quartile of the global lithium cost curve Large, Long-life Resource with verified expansion potential De-Risked Project that is permitted, shovel ready, with Off-takes, and US$996 million in low-cost debt 2 Updated economics confirm strength and resilience of Project at prevailing weak lithium prices 3 4 5 6 Partnering Process begun to advance development of Project 1 INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 4

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![](image0004.jpg)

Ore Reserve More Than Quadruples 1 See Company announcement titled "Ore Reserve Quadruples; Revised Project Economics" dated 2 June 2025. Reserves Contained Equivalent Grade (%) Contained Equivalent Tons (kst) Tonnage (kst) Li Grade (ppm) B Grade (ppm) Li2Co3 H3BO3 Li2Co3 H3BO3 Ore Reserve Proved 39,428 1,823 13,235 0.97 7.57 383 2,984 Total Hi-B Probable 51,812 1,632 11,640 0.87 6.66 450 3,448 Sub-total Hi-B (Stream 1) 91,240 1,715 12,329 0.91 7.05 833 6,432 Proved 46,321 1,358 1,348 0.72 2.04 335 357 Total Lo-B Probable 109,065 1,300 1,425 0.69 0.82 755 889 Sub-total Lo-B (Streams 2 & 3) 155,386 1,318 1,402 0.70 1.18 1,089 1,246 Total Proved & Probable Ore Reserve 246,626 1,465 5,445 0.78 9.32 1,922 7,678 1 INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 4 Underpins mine life of 95 years

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![](image0005.jpg)

Compelling Updated Economics 2 INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 4 Key metrics of Current Update Current LOM Estimate Years 1-25 Unlevered NPV8 $1,367 million Levered NPV8 $1,469 million Avg. LOM Annual Revenue $497 million $619 million Avg. Annual Lithium Production 18,800 tpa 21,200 tpa Avg. Annual Boric Acid Production 60,400 tpa 116,400 tpa Ore Reserves 246.6 Mt Life of Mine 95 years Average Annual EBITDA $319 million $406 million Capital Costs $1,667.9 million AACE Class 2 estimate Unlevered IRR 14.5% Levered IRR 18.3% Payback Period 8.0 years (from operations) Confidence Level P65 See Company announcement titled "Ore Reserve Quadruples; Reaffirms Robust Project Economics" dated 2 June 2025.

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![](image0006.jpg)

Project Capex Reconciliation 2 21.3 INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 4 65.4 311.0 146.8 225.1 98.2 64.5 1.3 1,667.9 785.5 600 Estimate Class 3 Estimate Summary Reconciliation - Class 3 2020 vs Class 2 2024 122.1 Changes Equipment and Material Qty Increase Equipment and Material Cost Increase Indirect Cost EPCM Escalation and Contingency Evaporator / Crystallization Option Sunk Costs Removal Owner's Cost Estimate Class 2 US$ x Million

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![](image0007.jpg)

Rhyolite Ridge Operating Costs – In the Bottom Quartile 3 LOM Production OPEX 14% Mine Operating Costs Processing Facility Operating Costs 86% 4% Sulphur Supplies & 13% Transport Hydrated Lime Supplies Reagents & Transport 16% ~51% of Opex Soda Ash Supplies & 67% Transport Other Reagent Costs Co-production of boric acid and lithium using one mining and processing flowsheet, provides a boric acid revenue credit to LCE/t C1 and ASIC OPEX Rhyolite Ridge AISC OPEX2 Provides resilience through lithium commodity downturns 1 C1 OPEX cost is defined as the net direct cash cost, or simply the cost of production including the costs of mining, processing, transportation, marketing, and onsite administration. 2 ASIC OPEX includes C1 OPEX, sustaining capital expense and interest expense. Source: Ioneer internal analysis and Benchmark Mineral Intelligence with lithium carbonate price from Benchmark Mineral Intelligence Lithium Price Assessment 30 April 2025 CIF Asia Spot price. - 2,000 4,000 6,000 8,000 10,000 20,000 18,000 16,000 14,000 12,000 - 100 200 300 400 500 600 700 800 Illustrative 2025e Production (Kt LCE) 900 1,000 1,100 1,200 1,300 Lithium Carbonate Price: US $8,570/tonne AISC OPEX Years 1-25: $5,745/t LEGEND Ioneer Other Lithium Operations Illustrative 2025e ASIC Operating Expense (US%/t LCE) C11 OPEX $3,858 / LCE tonne (Years 1-25) $6,237 / LCE tonne (LOM) INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 4

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![](image0008.jpg)

Rhyolite Ridge Lithium & Boric Acid Production (Years 1-25) 3 11 20 23 23 22 21 19 20 20 19 19 18 19 18 18 19 19 19 20 19 19 19 19 18 19 43 32 46 93 108 125 128 105 79 92 98 72 111 90 124 147 155 147 173 147 174 166 167 140 131 54 52 69 115 130 145 147 125 99 111 118 90 130 108 142 166 174 166 192 166 193 185 186 158 150 0 kpta 25 kpta 50 kpta 75 kpta 100 kpta 125 kpta 150 kpta 175 kpta 200 kpta 225 kpta 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 Boric Acid Lithium Product (LCE) INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 4 Contribution of boric acid is key to Project economics in low lithium price cycles

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![](image0009.jpg)

Diversified Revenue Streams Provide Stability 3 1 Ioneer market study, source Bloomberg L.P. Contribution of boric acid is key to Project economics in low lithium price cycles 53 % 40 % 34 % 30 % 24 % INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 10 18 % 17 % 17 % 13 % Lithium Carbonate (Battery Grade) Natural Gas Met Coal Oil Nickel Copper Zinc Aluminum Boric Acid Historical Price Volatility \| 15 Years

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![](image0010.jpg)

Substantially De-Risked Project 1 See announcement dated 20 January 2025 entitled "Rhyolite Ridge Lithium-Boron Project closes upsized US$996 million loan from U.S. Department of Energy to accelerate domestic critical mineral production". Permitted Shovel Ready Offtakes In Place Low-Cost Debt 70% Engineering design complete Industry leading partners Proven technology & equipment Technically led approach - + $200 m invested Lithium & Boron offtake Placed Signed lithium offtakes with Ford, EcoPro, PPES and Dragonfly Signed boron offtake and sales agreements U.S DOE loan for $996 million2 Low interest Long tenor Government loan Final Federal permit received in October 20241 The BLM issued a positive Record of Decision (ROD) concluding the NEPA process 4 INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 10

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![](image0011.jpg)

Fully Permitted Project with Path to Production 2007-2018 2019-2021 2022-2024 2016 2018 2007 Global Geoscience listed on ASX Initial interest in Rhyolite Ridge Project Acquired First exploration drilling activity Name changed to Ioneer Rhyolite Ridge PFS published. 2019 Commenced environmental baseline studies 2020 Results of DFS published 2021 Receipt of Air Quality and Water Pollution Control permits from Nevada 2022 2024 NASDAQ listing Listing of Tiehm's buckwheat and designation of critical habitat under Endangered Species Act Publication of Notice of Intent by BLM Draft Environmental Impact Statement Issued Final EIS Published Positive Record of Decision Issued by BLM 2025+ 2025 YTD Next Steps Secure strategic partner Make a "Final Investment Decision" 4 DOE $996 million Loan to support development of an on-site processing facility at the Rhyolite Ridge Project Significant increase in Mineral Resource Rhyolite Ridge Reserve and economic update INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 10

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![](image0012.jpg)

Rhyolite Ridge - a U.S. Shovel Ready Project Over 70% Engineering Design Complete 4 INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 10

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![](image0013.jpg)

Proposed Rhyolite Ridge Process Plant – Stage 1 Ore Handling/ Sizing and Storage Sulphuric Acid Plant Vat Leach Plant Sulphur Supply Power Plant Plant Utilities Boric Acid Circuit Reagents Lithium Carbonate Circuit Evaporation/ Crystallization Engineering rendering of the Rhyolite Ridge Processing Plant 4 INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 10

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![](image0014.jpg)

Rhyolite Ridge has the Right Partners Technically led approach EPCM Acid Plant Maint. & Support Lime Leaching Pumps Haulage System Evaporation and Crystallization Material Handling Power and Controls Environmental Flotation >US$200m invested to date PFS, Pilot Plant, DFS completed, Engineering ready. Fluor is EPCM Signed binding lithium offtake agreements Funding U.S. Dept of Energy Loan Programs Office loan of up to US$996m1 Looking to move forward with a strong equity partner who can help see the project into production. 1 See announcement dated 20 January 2025 entitled "Rhyolite Ridge Lithium-Boron Project closes upsized US$996 million loan from U.S. Department of Energy to accelerate domestic critical mineral production" 4 INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 10

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![](image0015.jpg)

Large and Expandable Resource 1 See Company announcement titled "February 2025 Mineral Resource Estimate" dated 5 March 2025. Rhyolite Ridge has a large, long-life Resource with substantial expansion potential Potential Expansion Projects Large and expandable Resource is driving Expansion Potential Summary of February 2025 Mineral Resource Estimate Contained Type Stream Classification Tonnage Li B Li2CO3 H3BO3 (ktonnes) (ppm) (ppm) (ktonnes) (ktonnes) High B 1 Total 178,625 1,624 11,754 1,544 12,005 Low B 2 Total 273,973 1,223 1,434 1,783 2,247 3 Total 57,775 2,089 1,231 642 407 ALL Grand Total 510,373 1,461 5,023 3,969 14,659 5 INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 10

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![](image0016.jpg)

Overall Cost of Reagents Driving Optimisation 5 51% of Operating Costs in reagent materials and transport Area where Ioneer has focussed on optimisation Reduced leach time improves acid yield, allowing for higher throughput Results in 7-14% higher LCE and BAE output Not included in today's economics Will be included once higher throughput mine plan is finalised LOM Operating Costs by Area 14% 22% 29% 15% 8% 6% 6% Mine Operating Costs Reagents Transport Reagents Material Personnel Costs for Processing Fuel Costs for Processing Product packaging & Transport Other Materials, Services, Supplies & Leases INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 10

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![](image0017.jpg)

Status of Partnering Process 6 Planning for a Strategic Partnering Process has begun INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 10 Goldman Sachs engaged to assist with the formal Strategic Partnering process We have relaunched a strategic partnering process in search of a partner who can help accelerate the development of Rhyolite Ridge Activities to date have included updating a data room and preparing materials. Outreach is expected to commence in Q2 2025 The process will be thorough and is expected to take a minimum of 4 months. Shareholders will be kept informed of progress on the process

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![](image0018.jpg)

Rhyolite Ridge Next steps INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 10 1 All future dates subject to change without notice Secure equity financing to sit alongside U.S. Government debt ($996 M) Final Investment Decision once equity and debt are in place Construction Phase. Expected to take approximately 36 months (including long lead items) First Production – 36 months from FID1 Pathway to future growth

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![](image0019.jpg)

Key Takeaways Shovel Ready Permitted Engineered Offtakes in place US government debt Water Expandable 510Mt Resource 247Mt Ore Reserve Stage 1 = 2.6Mtpa Multiple future stages possible High and low boron streams Robust Economics June 2025 Update REVENUE US$619M/YR EBITDA US$406M/YR NPV US$1,367M IRR 14.5% Dual Revenue 75% from Li and 25% from B Uncorrelated commodity pricing Low cost after boron credit Synergy benefits for expansion Unique Deposit Sedimentary lithium & boron High & low boron Integrated mine and chemical plant High recoveries, low energy input, small footprint A rare, long-life, permitted, shovel ready project in the U.S. INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 10

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![](image0020.jpg)

20 www.ioneer.com. ir@ioneer.com Questions Future U.S. Lithium & Boron Producer

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![](image0021.jpg)

Corporate Snapshot Capital Structure (As at 2 June 2025) Shares Outstanding 2.4b Performance Rights And Options Outstanding 64.9m Cash Balance– 31 Mar 20251 US$14.1m Share Price ASX – 30 May 2025 A$0.12 ADR Price NASDAQ (1 ADR = 40 ASX Shares) US$3.43 Market Capitalisation – 30 May 2025 A$283m Research Coverage Total Shareholder Composition As at 30 April 2025 Total Shares by Geography As at 30 April 2025 27.3% 28.6% 13.2% 6.8% 0.3% 0.8% 4.9% 18.1% Institutional Investors Retail Corporation/Non-Profit Related Parties Unallocated DRs Broker Custodian Unanalysed 1Cash balance is based off the latest quarterly information and is unaudited and unreviewed. See Company announcement titled "March 2025 – Quarterly Activities Report" dated 15 April 2025. 47.6% 34.5% 1.9% 6.8% 0.8% 8.4% Australia North America Asia United Kingdom Rest of Europe Rest of World INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 22

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![](image0022.jpg)

Proven & Experienced Team Experienced Board of Directors ALAN DAVIES Non-executive Director Former Chief Executive, Energy & Minerals of Rio Tinto ROSE McKINNEY-JAMES Non-executive Director Former President and CEO of Corporation for Solar Tech & Renewable Resources JAMES D. CALAWAY Executive Chair Former Non-executive chair of Orocobre Ltd MARGARET WALKER Non-executive Director Former VP Engineering and Technology Centers, Dow Chemical TIM WOODALL Non-executive Director 30 years' experience in M&A and finance, with expertise in the energy sector BERNARD ROWE Managing Director CEO & Founder Best-in-class Management Team with Industry Experience IAN BUCKNELL CFO & Company Secretary MATT WEAVER Snr VP Engineering & Operations CHAD YEFTICH VP Corporate Development & External Affairs KEN COON VP Human Resources YOSHIO NAGAI VP Commercial Sales & Marketing INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 22

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![](image0023.jpg)

South Basin Resource Estimate Feb 2025 INVESTOR PRESENTATION June 2025 : IONR ASX : INR www.ioneer.com 22 Contained Stream Classification Tonnage Ktonnes Li ppm B ppm Li2CO3 Wt. % H3BO3 Wt. % Li2CO3 (kt) H3BO3 (kt) 1 Searlesite: High-boron lithium mineralisation (low clay content) Measured 64,380 1,752 12,670 0.93 7.24 600 4,664 Indicated 87,372 1,551 11,280 0.83 6.45 721 5,636 Inferred 26,873 1,554 11,102 0.83 6.35 222 1,706 Total S1 178,625 1,624 11,754 0.86 6.72 1,544 12,005 2 Low–boron lithium mineralisation (low clay content) Measured 68,713 1,257 1,554 0.67 0.89 460 611 Indicated 145,061 1,196 1,583 0.64 0.90 923 1,313 Inferred 60,199 1,249 941 0.66 0.54 400 324 Total S2 273,973 1,223 1,434 0.65 0.82 1,783 2,247 3 Low-boron lithium mineralisation (high clay content) Measured 19,191 2,203 1,552 1.17 0.89 225 170 Indicated 29,066 2,112 1,187 1.12 0.68 327 197 Inferred 9,518 1,789 716 0.95 0.41 91 39 Total S3 57,775 2,089 1,231 1.11 0.70 642 407 ALL Grand Total 510,373 1,461 5,023 0.78 2.87 3,969 14,659 1 See Company announcement titled "February 2025 Mineral Resource Estimate" dated 5 March 2025.

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