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v3.23.1

Property, plant and equipment - Summary of key assumptions used for assessing recoverable amount of company's CGUs versus carrying values (Detail) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2022 $ / oz | Apr. 30, 2007 $ / oz | Jun. 30, 2020 $ / oz | Dec. 31, 2022 $ / T $ / oz $ / lb | Dec. 31, 2021 $ / oz $ / T $ / lb
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Silver price ($/oz) | 11.66 | 3.83 | 2.00 |  |
Value Beyond Proven and Probable, Fair Value Price Per Dollar | $ / lb |  |  |  | 361,352 | 330,848
Value beyond proven and probable, fair value per ounce |  |  |  | 224 | 251
GREECE | Bottom of range | Individual assets or cash-generating units |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Gold price ($/oz) |  |  |  | 1,725 | 1,800
Silver price ($/oz) |  |  |  | 22 | 24
Lead price ($/t) | $ / T |  |  |  | 2,050 | 2,150
Zinc price ($/t) | $ / T |  |  |  | 3,000 | 2,825
Discount rate |  |  |  | 7.00% | 6.00%
GREECE | Top of range | Individual assets or cash-generating units |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Gold price ($/oz) |  |  |  | 1,600 | 1,550
Silver price ($/oz) |  |  |  | 21 | 21
Lead price ($/t) | $ / T |  |  |  | 2,000 | 2,050
Zinc price ($/t) | $ / T |  |  |  | 2,550 | 2,500
Discount rate |  |  |  | 7.50% | 6.50%

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