Ore Reserve for Dampier Project held by Kimberley Mineral Sands Pty Ltd as at 30 June 20251 (Sheffield interest - 50%) Dampier Project Ore Reserve Valuable HM Grade (In-situ) Mineral Assemblage Deposit Ore Reserve Category Ore Tonnes (million) HM Grade (%) OS (%) Adj. OS (%)2 Slimes (%) Zircon (%) HiTi Leuc (%) Leuc (%) Ilmenite (%) Zircon (%) HiTi Leuc (%) Leuc (%) Ilmenite (%) Thunderbird Proved 205 13.6 15 44 16 1.00 0.29 0.27 3.6 7.4 2.2 2.0 26 Probable 510 10.1 11 36 14 0.79 0.26 0.27 2.9 7.8 2.6 2.6 28 Total 710 11.1 12 38 15 0.85 0.27 0.27 3.1 7.6 2.4 2.4 28 Note 1: End of period mining pickups occur on 25th of the month. Mining physicals between 26th - 30th are not material in relation to the overall Ore Reserve and are within rounding tolerances. Note 2: An adjustment has been made to the oversize contents to align this with production data. Adjusted oversize is estimated on a block model cell basis based on the MRE estimated oversize (OS) and the formula (OS*2+15)%. Adjusted oversize has not been reported in previous estimates. Previous Ore Reserve for Dampier Project held by Kimberley Mineral Sands Pty Ltd as at 30 June 2024 Dampier Project Ore Reserve Valuable HM Grade (In-situ) Mineral Assemblage Deposit Ore Reserve Category Ore Tonnes (millions) HM Grade (%) Oversize (%) Slimes (%) Zircon (%) HiTi Leuc (%) Leuc (%) Ilmenite (%) Zircon (%) HiTi Leuc (%) Leuc (%) Ilmenite (%) Thunderbird Proved 235 12.9 13 16 0.95 0.29 0.28 3.4 7.4 2.2 2.2 27 Probable 515 10.1 11 15 0.78 0.26 0.27 2.9 7.8 2.6 2.6 28 Total 750 11.0 11 15 0.84 0.27 0.27 3.0 7.7 2.4 2.5 28 The 30 June 2025 and 30 June 2024 estimates have been rounded to 5Mt for ore tonnes, 0.1% for HM and 2 significant figures for oversize, slimes, zircon, HiTi, leucoxene and ilmenite. Valuable Mineral Assemblage is expressed both as % in ore and % in HM. Ore Reserves are reported as material within pit designs but limited to below a top-of-ore surface generated from consideration of the optimisation value modelling, discard strategy and current geological domain interpretation. Note 1: Tonnages and grades are rounded to reflect the relative uncertainty of the estimate, thus the sum of columns may not equal. Note 2: HM is within the 38µm to 1mm size fraction and reported as a percentage of the total material, slimes is the -38µm fraction and oversize is the +1mm fraction. Ore Reserves and Mineral Resources 34 Sheffield Resources Limited Annual Report 2025
RkJQdWJsaXNoZXIy MjE2NDg3