LCT Pegmatite Deposits Refer to IGO’s ASX release 31 January 2022 ‘CY Annual Resources and Reserves Update’ for full JORC Code 2012 reporting details and the attachment to the ASX release dated 30 August 2022, regarding a revised JORC Code Table 1 Checklist for Greenbushes Mineral Resource estimates. JORC Code 2012 Mineral Resource Estimates Estimate location JORC Code Class 31 August 2021 Mass Grade 6% Li2O concentrate (Mt) (%Li2O) (Mt) Central Lode Measured - - - Indicated 189.9 1.8 57.9 Inferred 104.6 1.0 16.7 Subtotal 294.4 1.5 74.6 Kapanga Measured - - - Indicated 38.6 1.8 11.5 Inferred 3.9 1.9 1.2 Subtotal 42.5 1.8 12.7 TSF1 Measured - - - Indicated 18.3 1.3 3.9 Inferred - - - Subtotal 18.3 1.3 3.9 Stockpiles Measured 0.5 3.2 0.3 Indicated 2.6 1.9 0.8 Inferred 1.8 1.0 0.3 Subtotal 5.0 1.7 1.4 Total Measured 0.5 3.2 0.3 Indicated 249.4 1.8 74.2 Inferred 110.3 1.0 18.2 Greenbushes Operation 360.2 1.5 92.7 IGO 24.99% interest 90.0 1.5 23.1 Greenbushes Operation (100%) Greenbushes Operation (100%) JORC Code 2012 Ore Reserve Estimates Estimate location JORC Code Class 31 August 2021 Mass Grade 6% Li2O concentrate (Mt) (%Li2O) (Mt) Central Lode Proved - - - Probable 138.5 2.0 46.2 Subtotal 138.5 2.0 46.2 Kapanga Proved - - - Probable 27.9 1.9 8.9 Subtotal 27.9 1.9 8.9 TSF1 Proved - - - Probable 10.1 1.4 2.4 Subtotal 10.1 1.4 2.4 Stockpiles Proved 0.5 3.2 0.3 Probable 2.6 1.9 0.8 Subtotal 3.1 2.1 1.1 Total Proved 0.5 3.2 0.3 Probable 179.1 2.0 58.4 Greenbushes Operation 179.6 2.0 58.7 IGO 24.99% interest 44.9 2.0 14.7 Notes: • Greenbushes’ production post 31 August 2021 to 31 December 2021 totalled 1.24Mt grading 2.41% Li2O. In the quarter ending 31 March 2022, Greenbushes mined 0.94Mt grading 2.25% Li2O. In the quarter ending 30 June 2022 Greenbushes mined 1.01Mt grading 2.53% Li2O. Note the tonnage and grades vary slightly from IGO’s quarterly reports due to post reporting adjustments. Competent Persons Statements Information in this Mineral Resources and Ore Reserves section that relates to Exploration Targets, Exploration Results, Mineral Resources or Ore Reserves is based on the information compiled by the Competent Persons listed in the table below, which includes details of their respective professional memberships, their relationship to IGO and details of the reporting activity for which each Competent Person is taking responsibility. All the Competent Persons have provided IGO with written confirmation that they have sufficient experience that is relevant to the style of mineralisation and type of deposit under their consideration, and to the reporting activity being undertaken, to qualify as a Competent Person as defined in the 2012 Edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves – the JORC Code. They have also provided IGO with a written consent in the ASX release dated 31 January 2022 or in the release dated 30 August 2022, to the inclusion in this report of the respective matters based on each Competent Person’s information in the form and context in which they appear in this report, and that there are no issues that could be perceived as a material conflict of interest in this public report to the ASX or otherwise described items that could be perceived as a conflict. IGOCompetent Persons for 30 June 2022 Estimates and Results Competent Persons for IGO’s JORC Code Reportable Estimates Professional Association Activity Competent Person Membership Number IGO Relationship Responsibility Activity Mineral Resource Paul Hetherington MAusIMM 209805 Geology Superintendent (IGO) Nova estimation Daryl Baker MAusIMM 221170 Geology Superintendent (Talison) Greenbushes estimation Mark Murphy MAIG/RPGeo 2157 Resource Geology Manager (IGO) Silver Knight estimation Andre Wulfse FAusIMM 228344 Group Manager Mineral Resources (IGO-Western Areas) Cosmos/Forrestania estimation Ore Reserves Gregory Laing MAusIMM 206228 Principal Mining Engineer (IGO) Nova estimation Andrew Payne MAusIMM 308883 Mine Planning Superintendent (Talison) Greenbushes estimation Marco Orunesu Preiata MAusIMM 305362 General Manager Technical Service (IGO-Western Areas) Cosmos/Forrestania estimation FY22 Report Mark Murphy MAIG/RPGeo 2157 Resource Geology Manager (IGO) Annual report compilation Notes: 1. FAusIMM = Fellow of the Australasian Institute of Mining and Metallurgy, MAusIMM = Member of the Australasian Institute of Mining and Metallurgy and MAIG/RPGeo = Member of the Australian Institute of Geoscientists and Registered Professional Geoscientist 2. Information in this report that relates to Exploration Targets, Exploration Results, Mineral Resources or Ore Reserves is based on the information compiled by the relevant Competent Persons and activities listed above 3. All IGO personnel are full-time employees of IGO; all Talison personnel are full time employees of Talison; and 4. Paul Hetherington, Gregory Laing, Mark Murphy and Andre Wulfse are IGO minor shareholders. Mark Murphy may also receive incentive payments where one of the metrics assessed is growth in Ore Reserve over a three year period. Marco Orunesu Preiata and Daryl Baker have no interests that could be perceived as a conflict of interest for their respective reporting roles. 38 —IGO ANNUAL REPORT 2022 IGO ANNUAL REPORT 2022— 39
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