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v3.19.1

Provisions - Schedule of Assumption in Provision Calculation (Detail) | Dec. 31, 2018 | Dec. 31, 2017
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South Africa [member] |  |
Disclosure of Provisions [line items] |  |
Inflation rate | 5.50% | 5.50%
Discount rate | 10.00% | 9.80%
Ghana [member] |  |
Disclosure of Provisions [line items] |  |
Inflation rate | 2.20% | 2.20%
Discount rate | 10.30% |
Australia [member] |  |
Disclosure of Provisions [line items] |  |
Inflation rate | 2.50% | 2.50%
Peru [member] |  |
Disclosure of Provisions [line items] |  |
Inflation rate | 2.20% | 2.20%
Discount rate | 4.20% | 3.80%
CHILE |  |
Disclosure of Provisions [line items] |  |
Inflation rate | 2.20% |
Discount rate | 3.60% |
Bottom of range [member] | Ghana [member] |  |
Disclosure of Provisions [line items] |  |
Discount rate |  | 9.20%
Bottom of range [member] | Australia [member] |  |
Disclosure of Provisions [line items] |  |
Discount rate | 2.30% | 2.60%
Top of range [member] | Ghana [member] |  |
Disclosure of Provisions [line items] |  |
Discount rate |  | 9.30%
Top of range [member] | Australia [member] |  |
Disclosure of Provisions [line items] |  |
Discount rate | 2.50% | 2.90%

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- Definition The discount rate used in the calculation of the provision for costs related to decommissioning, restoration and rehabilitation. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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