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Business transactions (Summary of Consideration Paid in the Acquisition of Amerisur) (Details) - Amerisur Resources Limited [Member] $ in Thousands | Dec. 31, 2020 USD ($)
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Disclosure of detailed information about business combination [line items] |
Cash | $ 314,163
Total consideration | 314,163
Property, plant and equipment (including mineral interest) | 276,988
Right-of-use assets | 16,674
Deferred income tax asset | 4,071
Prepayment and other receivables | 30,024
Trade receivables | 5,964
Inventories | 4,128
Other assets | 5,991
Cash and cash equivalents | 41,828
Lease liabilities | (17,851)
Provision for other long-term liabilities | (16,519)
Current income tax liability | (3,426)
Trade and other payables | (33,709)
Total identifiable net assets | $ 314,163

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