Company: RTNTF
Filing Date: 2025-02-20
Form Type: 20-F
Source: 0001628280-25-006642
Chunk: 345

Company: RIO TINTO LTD
Filing Date: 2025-02-20
Form: 20-F
Chunk 345
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|                                                                       | 2024US$m | 2023US$m |
| Undiscounted close-down, restoration and environmental obligations    |   23,038 |   23,372 |
| Impact of discounting                                                 |   -7,307 |   -6,222 |
| Present value of close-down, restoration and environmental provisions |   15,731 |   17,150 |
| Attributable to:                                                      |          |          |
| Operating sites                                                       |   11,715 |   12,021 |
| Non-operating sites                                                   |    4,016 |    5,129 |
| Total close-down, restoration and environmental provisions            |   15,731 |   17,150 |

| Closure cost composition as at 31 December       | 2024US$m | 2023US$m |
| Decommissioning, decontamination and demolition  |    3,065 |    3,591 |
| Closure and rehabilitation earthworks(a)         |    4,628 |    4,609 |
| Long-term water management costs(b)              |    1,316 |    1,236 |
| Post-closure monitoring and maintenance          |    1,581 |    1,806 |
| Indirect costs, owners’ costs and contingency(c) |    5,141 |    5,908 |
| Total                                            |   15,731 |   17,150 |

(a) A key component of earthworks rehabilitation involves re-landscaping the area disturbed by mining activities utilising largely diesel-powered heavy mobile equipment. In developing low-

carbon solutions for our mobile fleet, this may include electrification of the vehicles during the mine life. The forecast cash flows for the heavy mobile equipment in the closure cost estimate

are based on existing fuel sources. The cost incurred during closure could reduce if these activities are powered by renewable energy.

(b) Long-term water management relates to the post-closure treatment of water due to acid rock drainage and other environmental commitments and is an area of research and development

focus for our Closure team. The cost of this water processing can continue for many years after the bulk earthworks and demolition activities have completed and are therefore exposed to

long-term climate change. This could materially affect rates of precipitation and therefore change the volume of water requiring processing. It is not currently possible to forecast accurately

the impact this could have on the closure provision as some of our locations could