Company: RTNTF
Filing Date: 2025-02-20
Form Type: 20-F
Source: 0001628280-25-006642
Chunk: 539

Company: RIO TINTO LTD
Filing Date: 2025-02-20
Form: 20-F
Chunk 539
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 5km north of the Pic de Fon deposit. It is an approximately 7km long and 700m wide zone of mineralisation. The Pic de Fon deposit is an approximately 7.5km long, and 500m wide (extending briefly to just over 1,000m wide at the northern end of the deposit) zone of mineralisation. The deposit forms part of a north-northwest trending ridge, and both deposits originated from an itabirite precursor. The ridge line likely forms part of an ancient erosion surface, probably mid-tertiary in age, which has been subjected to deep prolonged tropical weathering. Ouéléba hematite goethite mineralisation consists mainly of friable hematite-goethite material extending locally also to depths greater than 400m below surface. Hematite mineralisation at Pic de Fon consists mainly of friable hematite material extending locally to depths greater than 400m below surface. Mineral Resources The table on pages 292 - 293 sets out the amount and grade, of Simandou’s Measured, Indicated and Inferred Mineral Resources for the year ended 31 December 2024. The 9% increase in Measured and Indicated Mineral Resources and 4% decrease in Inferred Mineral Resources compared to the year ended 31 December 2023 is primarily due to updates to the Oueleba North model. 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. – Mineral Resources are estimated using ordinary kriging. – The sample data preparation including data capping is appropriate for use in estimation of Mineral Resources. – The pit optimisation used to determine the resources that have reasonable prospects of economic extraction. – It is assumed that standard open pit load and haul mining operations will be applicable for the mining of Mineral Resources. Processing will be through crushing and blending. – Studies are currently in progress to determine the viability of producing a DSO dual product including Blast Furnace (BF), and Direct Reduction (DR) quality products from the operation over the life of mine. For more information regarding the material assumptions for the Mineral Resources estimates, see Section 11 of the Simandou Technical Report Summary filed as exhibit 96.4 to the 2023 Form 20-F .

| Annual Report on Form 20-F 2024 | 356 | riotinto