Company: RTNTF
Filing Date: 2025-02-20
Form Type: 20-F
Source: 0001628280-25-006642
Chunk: 514

Company: RIO TINTO LTD
Filing Date: 2025-02-20
Form: 20-F
Chunk 514
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 accounts, indigenous employment and business opportunities and heritage and cultural protections. Encumbrances There are no known significant encumbrances to the Pilbara Property’s Mineral Resources or Mineral Reserves. For further details regarding the titles, leases and rights for each of the mines in the Pilbara Property, see Mines and Production Facilities–Pilbara on pages 302-305 . Mineral Resources The table on pages 292 - 293 of this Form 20-F sets out the amount and grade, of the Pilbara Property’s Measured, Indicated and Inferred Mineral Resources for the year ended 31 December 2024 for the Pilbara Property (Australian Iron Ore operations). Mineral Resources are reported as in situ estimates. Compared to the year ended 31 December 2023, there was a 6% increase in Measured and Indicated Resources and a 1% increase in Inferred Resources for the year ended 31 December 2024. This is due to the net effects of the addition of new Mineral Resources, model updates and the conversion of Mineral Resources to Mineral Reserves. The Mineral Resources estimate is based on the following assumptions: – Exclusive of Mineral Reserves – Mineral Resources are reported exclusive of Mineral Reserves. – Moisture – All Mineral Resources tonnages are estimated and reported on a dry basis. – Mining Factors or Assumptions – It is assumed that standard open pit load and haul mining operations used by Rio Tinto will be applicable for the mining of Mineral Resources ore. – Cut-off – Currently, Rio Tinto reports Mineral Resources by deposit type (BID further sub-divided by geological formation, CID and DID). In addition to this, Rio Tinto sub-divides iron mineralisation for reporting Mineral Resources typically using the following criteria: • High-grade Brockman is reported as ≥ 60% iron (Fe). • Brockman Process Ore is reported as ≥ 50% Fe <60% and ≥ 3% alumina (Al 2 O 3 ) < 6% where geology is coded as Joffre Member, Dales Gorge Member or Footwall Zone. • High-grade Marra Mamba is reported as ≥ 58% Fe where geology is coded as Newman Member, MacLeod Member, or Nammuldi Member. • Boolgeeda is reported as High Grade ≥ 60% Fe and as Blending Aluminous ≥ 55% Fe < 60% and ≥ 3% Al 2 O 3 < 6.5%.