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Acquisition of Asanko Gold - Summary of Key Assumptions Used to Determine Fair Value of Redeemable Preference Shares at Acquisition (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Disclosure of detailed information about business combination [abstract] |
Par value of the preference shares | $ 165.0
Market-related interest rate | 7.85%
Expected redemption period - 2020 to 2023 | 5 years

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