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Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
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Summary of Significant Assumptions Used in Group's Impairment Assessments (FVLCOD calculations) | Significant assumptions used in the Group’s impairment assessments (FVLCOD calculations) include:
|  | 2018 |  |  | 2017 |
US$ gold price per ounce – year 1 |  | US$ | 1,200 |  |  | US$ | 1,200 |
US$ gold price per ounce – year 2 onwards |  | US$ | 1,300 |  |  | US$ | 1,300 |
Rand gold price per kilogram – year 1 |  | R | 525,000 |  |  | R | 525,000 |
Rand gold price per kilogram – year 2 onwards |  | R | 550,000 |  |  | R | 525,000 |
A$ gold price per ounce – year 1 |  | A$ | 1,600 |  |  | A$ | 1,600 |
A$ gold price per ounce – year 2 onwards |  | A$ | 1,700 |  |  | A$ | 1,700 |
US$ copper price per tonne – year 1 |  | US$ | 5,951 |  |  | US$ | 5,512 |
US$ copper price per tonne – year 2 onwards |  | US$ | 6,612 |  |  | US$ | 6,171 |
Resource value per ounce (used to calculate the value beyond proved and probable reserves) |  |  |  |  |  |  |  |
•  South Africa (with infrastructure) |  | US$ | 17 |  |  | US$ | 17 |
•  Ghana (with infrastructure) |  | US$ | 44 |  |  | US$ | 41 |
•  Peru (with infrastructure) |  | US$ | 70 |  |  | US$ | 41 |
•  Australia (2018: with infrastructure, 2017: without infrastructure)2 |  | US$ | 28 |  |  | US$ | 293 |
Discount rates |  |  |  |  |  |  |  |
•  South Africa – nominal |  |  | 13.5 | % |  |  | 13.5 | %
•  Ghana – real |  |  | 9.5 | % |  |  | 9.7 | %
•  Peru – real |  |  | 4.9 | % |  |  | 4.8 | %
•  Australia – real |  |  | 3.4 | % |  |  | 3.8 | %
Inflation rate – South Africa1 |  |  | 5.5 | % |  |  | 5.5 | %
Life-of-mine |  |  |  |  |  |  |  |
•  South Deep |  |  | 75 years |  |  |  | 78 years |
•  Tarkwa |  |  | 14 years |  |  |  | 14 years |
•  Damang |  |  | 7 years |  |  |  | 8 years |
•  Cerro Corona |  |  | 12 years |  |  |  | 13 years |
•  St Ives |  |  | 7 years |  |  |  | 5 years |
•  Agnew/Lawlers |  |  | 4 years |  |  |  | 4 years |
•  Granny Smith |  |  | 12 years |  |  |  | 11 years |
•  Gruyere |  |  | 12 years |  |  |  | 13 years |
Long-term exchange rates |  |  |  |  |  |  |  |
US$/ZAR – year 1 |  |  | 13.61 |  |  |  | 13.61 |
US$/ZAR – year 2 onwards |  |  | 13.16 |  |  |  | 13.16 |
A$/US$ – year 1 |  |  | 0.75 |  |  |  | 0.75 |
A$/US$ – year 2 onwards |  |  | 0.76 |  |  |  | 0.76 |
1 | Due to the availability of unredeemed capital for tax purposes over several years into the life of the South Deep mine, nominal cash flows are used for South Africa. In order to determine nominal cash flows in South Africa, costs are inflated by the current South African inflation rate. Cash flows for all other operations are in real terms and as a result are not inflated.
2 | The US$293 per ounce is reflective of higher resource prices in the 2017 population used.

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- Definition The disclosure of information for an individual asset, including goodwill, or a cash-generating unit, for which an impairment loss has been recognised or reversed. [Refer: Goodwill; Impairment loss; Reversal of impairment loss; Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130&doctype=Standard -URIDate 2018-03-16 + Details
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