Company: RTNTF
Filing Date: 2025-02-20
Form Type: 20-F
Source: 0001628280-25-006642
Chunk: 540

Company: RIO TINTO LTD
Filing Date: 2025-02-20
Form: 20-F
Chunk 540
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Additional information | US Disclosure Mineral Reserves The table on pages 280 - 281 sets out the amount, grade, price and metallurgical recovery of Simandou‘s Proven and Probable Mineral Reserves for the year ended 31 December 2024. There is no material change in total Mineral Reserves compared to the year ended 31 December 2023. The updated Mineral Reserves reflect a classification change from Proven Mineral Reserves to Probable Mineral Reserves due to geotechnical parameters supporting design being largely at pre-feasibility study level. The Mineral Reserves estimates for Simandou are based on a Life of Mine plan that has been developed in accordance with SK-1300 and using industry accepted strategic planning approaches which defined the life of the mine at Ouéléba. Inferred Mineral Resources have been treated as waste. The final reserves plan is the outcome of the application of appropriate modifying factors in order to establish an economically viable and operational mine plan. At Ouéléba a variable cut-off grade strategy is applied to develop the mine plan to separate the BF and DR products within the iron ore mineralisation. The Mineral Reserves estimate only includes the Ouéléba deposit. The Pic de Fon deposit will be the subject of a feasibility study level investigation in the future and more detail is provided in Table 1.2 of exhibit 96.4 to the 2023 Form 20-F . Material assumptions in the estimation of Mineral Reserves are: – The resource model reflects the continuity and complexity of the deposit with the confidence stated in the classification. – Mineral Reserves are reported as dry mill feed tonnes. – Cut-off grades for Direct Shipping Ore (DSO) iron ore product. have been applied within the life of mine final pit design based upon Fe >=58%, Al 2 O 3 + SiO 2 <= 8%, P <= 0.25%. – Commodity prices, operating and capital costs. – Geology models contain tonnage estimates on a dry in situ basis. The estimated water content (moisture) for each block model block is added. – Processing recovery estimates are applied to ex-pit handling as 0.5% losses. Uncertainties that affect the reliability or confidence in the Mineral Reserves estimate include but are not limited to: – Future macro-economic environment, including metal prices and foreign exchange rate. – Changes to operating cost assumptions, including labour costs. – Ability to continue sourcing water. – Changes to mining, hydrological, geotechnical