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v3.19.1

Mining and Income Taxation - Summary of Domestic and Foreign Current Tax Rates (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Domestic and Foreign Current Tax Rate [Line Items] |  |  |
Current tax rates | 29.00% | 30.00% | 30.00%
Ghana Tax [member] | Non Mining Tax [member] |  |  |
Disclosure of Domestic and Foreign Current Tax Rate [Line Items] |  |  |
Current tax rates | 32.50% | 32.50% | 32.50%
South African - Components of Mining and Income Tax [Member] |  |  |
Disclosure of Domestic and Foreign Current Tax Rate [Line Items] |  |  |
South African Mining Tax Formula | South African mining tax on mining income is determined according to a formula Y=34-170/X in 2018, 2017 and 2016 | South African mining tax on mining income is determined according to a formula Y=34-170/X in 2018, 2017 and 2016 | South African mining tax on mining income is determined according to a formula Y=34-170/X in 2018, 2017 and 2016
South African - Components of Mining and Income Tax [Member] | Non Mining Tax [member] |  |  |
Disclosure of Domestic and Foreign Current Tax Rate [Line Items] |  |  |
Current tax rates | 28.00% | 28.00% | 28.00%
South African - Components of Mining and Income Tax [Member] | Company Tax Rate [member] |  |  |
Disclosure of Domestic and Foreign Current Tax Rate [Line Items] |  |  |
Current tax rates | 28.00% | 28.00% | 28.00%
Australia Tax [member] | Non Mining Tax [member] |  |  |
Disclosure of Domestic and Foreign Current Tax Rate [Line Items] |  |  |
Current tax rates | 30.00% | 30.00% | 30.00%
Peru Tax [member] | Non Mining Tax [member] |  |  |
Disclosure of Domestic and Foreign Current Tax Rate [Line Items] |  |  |
Current tax rates | 29.50% | 29.50% | 30.00%

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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