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Long-term loan - Disclosure of long-term loan - Vedanta (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term loan | $ 15,400 | $ 15,118 | $ 14,818
Vedanta |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term loan | 15,400 |  |
Vedanta | Principal |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term loan | 15,000 |  |
Vedanta | Balance of accreted premium net of unamortized issuance costs |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term loan | 400 |  |
Vedanta | 2023 | Principal |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term loan | 5,156 |  |
Vedanta | 2024 | Principal |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term loan | 5,625 |  |
Vedanta | 2025 | Principal |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term loan | $ 4,219 |  |

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