Nova Operation JORC Code 2012 Ore Reserve Estimates on 31 December CY20 and CY21 Source JORC Code Class 31 December 2020 31 December 2021 Mass Nickel Copper Cobalt Mass Nickel Copper Cobalt (Mt) (%) (kt) (%) (kt) (%) (kt) (Mt) (%) (kt) (%) (kt) (%) (kt) Underground Proved 8.68 1.83 159 0.776 67.3 0.067 5.80 6.94 1.71 118 0.723 50.2 0.062 4.31 Probable 0.27 1.41 4 0.576 1.6 0.051 0.14 0.26 1.40 4 0.578 1.5 0.050 0.13 Subtotal 8.95 1.82 163 0.770 68.9 0.066 5.94 7.20 1.69 122 0.717 51.7 0.062 4.44 Stockpiles Proved 0.04 1.62 1 0.654 0.3 0.065 0.03 0.05 2.00 1 0.881 0.5 0.072 0.04 Total Proved 8.72 1.83 160 0.775 67.6 0.067 5.82 6.99 1.71 119 0.724 50.6 0.062 4.35 Probable 0.27 1.41 4 0.576 1.6 0.051 0.14 0.26 1.40 4 0.578 1.5 0.050 0.13 Nova Operation 9.00 1.82 163 0.769 69.2 0.066 5.96 7.26 1.70 123 0.719 52.1 0.062 4.48 Notes: • Nova Operation mined 0.807Mt grading 1.96% Ni, 0.835% Cu and 0.075% Co from 1 January 2022 to the end of 30 June 2022. JORC Code 2012 Mineral Resource Estimates at FY21 and FY22 Estimates JORC Code Class 30 June 2021 30 June 2022 Mass Nickel Mass Nickel (Mt) (Ni%) (kt) (Mt) (Ni%) (kt) OD-AM5-AM6 Measured - - - - - - Indicated - - - 11.56 2.27 262 Inferred - - - 2.52 2.65 67 Subtotal - - - 14.08 2.34 329 Mt Goode Measured - - - 13.56 0.78 106 Indicated - - - 27.36 0.58 159 Inferred - - - 12.01 0.52 62 Subtotal - - - 52.94 0.62 327 Stockpiles Measured - - - - - - Total Measured - - - 13.56 0.78 106 Indicated - - - 38.92 1.08 421 Inferred - - - 14.53 0.89 129 Cosmos Project - - - 67.01 0.98 656 Cosmos Project Silver Knight Project JORC Code 2012 Mineral Resource Estimates on CY20 and CY21 Estimates JORC Code Class 31 December 2020 31 December 2021 Mass Nickel Copper Cobalt Mass Nickel Copper Cobalt (Mt) (%) (kt) (%) (kt) (%) (kt) (Mt) (%) (kt) (%) (kt) (%) (kt) Open pit Measured - - - - - - - - - - - - - - Indicated - - - - - - - 0.38 2.80 10.7 1.458 5.6 0.139 0.53 Inferred - - - - - - - 0.01 3.56 0.2 2.005 0.1 0.142 0.01 Silver Knight - - - - - - - 0.39 2.81 10.9 1.467 5.7 0.140 0.54 JORC Code 2012 and 2004 Mineral Resource Estimates at FY21 and FY22 JORC Code Edition Estimates JORC Code Class 30 June 2021 30 June 2022 Mass Nickel Mass Nickel (Mt) (%) (kt) (Mt) (%) (kt) 2012 All Measured - - - - - - Indicated - - - 4.79 2.33 112 Inferred - - - 2.84 1.51 43 Subtotal - - - 7.63 2.03 155 Stockpiles Measured - - - - - - Total Measured - - - - - - Indicated - - - 4.79 2.33 112 Inferred - - - 2.84 1.51 43 Subtotal JORC Code 2012 - - - 7.63 2.03 155 2004 Total Measured - - - - - - Indicated - - - 4.40 1.43 63 Inferred - - - 0.41 1.26 5 Subtotal JORC Code 2004 - - - 4.82 1.42 68 Combined Total Measured - - - - - - Indicated - - - 9.19 1.43 175 Inferred - - - 3.25 1.26 48 Forrestania Operation - - - 12.45 1.79 223 Forrestania Operation Forrestania Operation JORC Code 2012 and 2004 Ore Reserve Estimates at FY21 and FY22 JORC Code Edition Estimates JORC Code Class 30 June 2021 30 June 2022 Mass Nickel Mass Nickel (Mt) (%) (kt) (Mt) (%) (kt) 2012 All Proved - - - - - - Probable - - - 0.78 3.17 25 Subtotal - - - 0.78 3.17 25 Stockpiles Proved - - - - - - Total Proved - - - - - - Probable - - - 0.78 3.17 25 Subtotal JORC Code 2012 - - - 0.78 3.17 25 2004 Total Proved - - - - - - Probable - - - 2.11 1.46 31 Subtotal JORC Code 2004 - - - 2.11 1.46 31 Combined Total Proved - - - - - - Probable - - - 2.89 1.92 56 Forrestania Operation 2.89 1.92 56 JORC Code 2012 Ore Reserve Estimates at FY21 and FY22 Estimates JORC Code Class 30 June 2021 30 June 2022 Mass Nickel Mass Nickel (Mt) (Ni%) (kt) (Mt) (Ni%) (kt) OD-AM6 Proved - - - - - - Probable - - - 10.23 2.07 212 Cosmos Project - - - 10.23 2.07 212 Cosmos Project 36 —IGO ANNUAL REPORT 2022 IGO ANNUAL REPORT 2022— 37
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