Company: RTNTF
Filing Date: 2025-02-20
Form Type: 20-F
Source: 0001628280-25-006642
Chunk: 517

Company: RIO TINTO LTD
Filing Date: 2025-02-20
Form: 20-F
Chunk 517
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| Robe Valley Pisolite  | 53-55%              |
| Brockman              | 57-60%              |
| Marra Mamba           | 56-58%              |

– Methodology – A mining schedule that fully consumes the scheduling inventory for the Pilbara Property is developed from the prepared OBMs. To demonstrate economic viability of the Mineral Reserves, economic modelling is completed. Material is only reported as Mineral Reserves if the level of geological certainty is sufficient to allow a Qualified Person to apply the modifying factors in sufficient detail to support detailed mine planning and economic viability of the deposit. For more information regarding the material assumptions for the Mineral Reserves estimates, see Section 12 of the Pilbara Operations Technical Report Summary filed as exhibit 96.1 to the 2021 Form 20-F . Exploration Additional information on exploration at the Pilbara Property can be found in Section 7 of the Pilbara Operations Technical Report Summary filed as exhibit 96.1 to the 2021 Form 20-F . Rio Tinto has an ongoing, active programme of exploration over various parts of the Pilbara Property. During 2024, 367,000m of drilling was completed on programs that are aimed at discovery and development of Rio Tinto’s iron ore deposits in the Pilbara Property. Surface exploration activities are also undertaken as part of geological mapping programs over areas where there are no or limited mining activities. A small number of grab samples (1-3kg) are collected when required. The following table provides a summary of the exploration drilling across the Pilbara Property.

| Exploration / Mining Area | Total drill holes by drill type |        |       |       |       | Total drill metres by drill type |           |         |         |
| P/A/V                     |                              RC |     DD |     U |       | P/A/V |                               RC |        DD |       U |         |
| Greater Brockman          |                           2,600 | 36,445 | 1,901 |    81 |       |                          147,700 | 2,605,102 | 156,260 |   2,383 |
| Greater Tom Price         |                           8,267 | 11,299 | 1,304 |    61 |       |                          493,017 |   890,486 | 118,616 |   2,958 |
| Greater Paraburdoo        |                           6,950 |  9,646 |