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Financial instruments - Financial Assets By Institution (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 09, 2024 | Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2022
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Other current financial assets |  |  |  | $ 1,325,843 |  |  | $ 1,079,595 |  |
Collateral guarantees |  |  |  | 5,590 |  |  | 0 |  |
Investment accounted for under the equity method |  |  |  | 86,417 |  |  | 585,794 |  | $ 54,386
Altilium Metals Ltd. |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Investment accounted for under the equity method |  |  | $ 4,380 | 7,620 | $ 7,620 |  | $ 0 | $ 12,000 |
Proportion of ownership interest in associate, percentage |  |  | 11.00% |  | 3.00% |  | 3.00% |  |
Salinity Solutions Ltd. |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Acquisition of equity instruments |  |  | $ 1,285 |  |  |  |  |  |
Proportion of ownership interest in associate, percentage |  |  | 14.86% |  |  |  |  |  |
Electric Era Technologies Inc. |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Acquisition of equity instruments |  | $ 3,000 |  |  |  |  |  |  |
Proportion of ownership interest in associate, percentage |  | 6.82% |  |  |  |  |  |  |
Azure Minerals |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Share of ownership in associates | 50.00% |  |  |  |  |  | 50.00% |  |
Increase (decrease) through transfer between revaluation surplus and retained earnings, equity | $ 186,809,000 |  |  |  |  |  |  |  |
Investment accounted for under the equity method |  |  |  | 0 |  |  | $ 542,456 |  |
Financial assets at amortized cost |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Other current financial assets |  |  |  | 1,316,797 |  |  | 1,061,262 |  |
Financial assets at amortized cost | Banco Crédito e Inversiones |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Other current financial assets |  |  |  | 74,459 |  |  | 174,684 |  |
Financial assets at amortized cost | Banco Morgan Stanley |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Other current financial assets |  |  |  | 5,590 |  |  | 0 |  |
Financial assets at amortized cost | Banco Santander |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Other current financial assets |  |  |  | 100,083 |  |  | 415,851 |  |
Financial assets at amortized cost | Banco Itaú CorpBanca |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Other current financial assets |  |  |  | 372,061 |  |  | 66,166 |  |
Financial assets at amortized cost | Scotiabank Chile |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Other current financial assets |  |  |  | 319,128 |  |  | 240,164 |  |
Financial assets at amortized cost | Bank of Nova Scotia |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Other current financial assets |  |  |  | 353,592 |  |  | 51,025 |  |
Financial assets at amortized cost | Sumitomo Mitsui Banking |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Other current financial assets |  |  |  | 91,884 |  |  | 0 |  |
Financial assets at amortized cost | Banco Estado |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Other current financial assets |  |  |  | 0 |  |  | 90,975 |  |
Financial assets at amortized cost | KBC Bank |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Other current financial assets |  |  |  | 0 |  |  | $ 22,397 |  |
Financial assets at fair value through other comprehensive income | Azure Minerals |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |
Acquisition of equity instruments |  |  |  | $ 4,317 | $ 12,904 | $ 13,480 |  |  |
Financial asset, ownership interest percentage |  |  |  |  |  | 19.99% |  |  |
Acquisition agreement, right to acquire products, percentage |  |  |  |  |  | 25.00% |  |  |

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