Ore Reserves and Mineral Resources continued Mineral Resources for Dampier Project held by Kimberley Mineral Sands Pty Ltd as at 30 June 2025 Dampier Project Mineral Resources1,2,3,4,5,6,7 Mineral Assemblage Deposit (cut-off) Mineral Resource Category Cut-off (THM%) Material Tonnes (millions) HM Grade (%) Zircon (%) HiTi Leuc6 (%) Leuc (%) Ilmenite (%) Oversize (%) Adjusted Oversize (%) Slimes (%) Thunderbird4,7 Measured 3.0 470 8.8 8.0 2.3 2.1 27 12 39 18 Indicated 3.0 2,040 6.6 8.3 2.7 3.0 28 8 32 15 Inferred 3.0 480 6.2 8.1 2.7 3.2 27 7 30 14 Total 3.0 2,990 6.8 8.2 2.6 2.9 28 9 33 16 Night Train Inferred 2.0 50 5.9 14 5.6 49 18 2 2 10 Total 2.0 50 5.9 14 5.6 49 18 2 2 10 All Dampier (various) Measured 3.0 470 8.9 8.0 2.3 2.2 27 12 39 18 Indicated 3.0 2,040 6.6 8.4 2.7 3.1 28 9 32 16 Inferred Various 530 6.1 8.6 2.9 7.4 27 7 27 14 Total Various 3,040 6.8 8.3 2.7 3.5 27 9 32 16 Note 1: Night Train: The Mineral Resources estimate was prepared by Optiro Pty Ltd (now Snowden Optiro) and first disclosed under the JORC Code (2012). Thunderbird: The Mineral Resource estimate was prepared by Optiro Pty Ltd (now Snowden Optiro) and first disclosed under the JORC Code (2012). The Dampier Project Mineral Resources are reported inclusive of (not additional to) Ore Reserves. 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. Note 3: Tonnes and grades have been rounded to reflect the relative accuracy and confidence level of the estimate, thus the sum of columns may not equal. Note 4: Thunderbird: Estimates of Mineral Assemblage are presented as percentages of the Heavy Mineral (HM) component of the deposit, as determined by magnetic separation, QEMSCANTM and XRF. Magnetic fractions were analysed by QEMSCANTM for mineral determination as follows: Ilmenite: 40-70% TiO2 >90% Liberation; Leucoxene: 70-94% TiO2 >90% Liberation; High Titanium Leucoxene (HiTi Leucoxene): >94% TiO2 >90% Liberation; and Zircon: 66.7% ZrO2+HfO2 >90% Liberation. The non-magnetic fraction was submitted for XRF analysis and minerals determined as follows: Zircon: ZrO2+HfO2/0.667 and High Titanium Leucoxene (HiTi Leucoxene): TiO2/0.94. An adjustment has been made to the oversize contents to align this with production data. Note 5: Night Train: Estimates of Mineral Assemblage are presented as percentages of the Heavy Mineral (HM) component of the deposit, as determined by magnetic separation, QEMSCANTM and XRF for one of 12 composite samples. Magnetic fractions were analysed by QEMSCANTM for mineral determination as follows: Ilmenite: 40-70% TiO 2 >90% Liberation; Leucoxene: 70-90% TiO2 >90% Liberation; High Titanium Leucoxene (HiTi Leucoxene) and Rutile 90% TiO2 >90% Liberation, and Zircon: 66.7% ZrO2+HfO2 >90% Liberation. The non-magnetic fraction was submitted for XRF analysis and minerals determined as follows: Zircon: ZrO2+HfO2/0.667 and High Titanium Leucoxene (HiTi Leucoxene): TiO2/0.94. HM assemblage determination- was by the QEMSCANTM process for 11 of 12 composite samples which uses observed mass and chemistry to classify particles according to their average chemistry, and then report mineral abundance by dominant % mass in particle. For the TiO2 minerals the following breakpoints were used to distinguish between Ilmenite 40% to 70% TiO2, Leucoxene 70% to 90% TiO2, High Titanium Leucoxene and Rutile > 90%, Screening of the heavy mineral was not required. Note 6: HiTi Leucoxene and Rutile (%) combined for Night Train at a >90% TiO2 (as one assemblage sample utilised=> 90% rutile and HiTi Leucoxene), HiTi Leucoxene for Thunderbird > 94% TiO2 Note 7: Mineral Resources at Thunderbird are depleted for mining to 25 June 2025. 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. 36 Sheffield Resources Limited Annual Report 2025
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