XML 316 R54.htm IDEA: XBRL DOCUMENT
v3.21.1

Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Text block [abstract] |
Summary of Significant Assumptions Used in Group's Impairment Assessments (FVLCOD calculations) | Significant assumptions used in the Group’s impairment assessments (FVLCOD calculations) include:
|  | 2020 |  |  | 2019 |  |  | 2018 |
US$ Gold price per ounce – year 1 |  | US$ | 1,600 |  |  | US$ | 1,500 |  |  | US$ | 1,200 |
US$ Gold price per ounce – year 2 |  | US$ | 1,700 |  |  | US$ | 1,400 |  |  | US$ | 1,300 |
US$ Gold price per ounce – year 3 |  | US$ | 1,600 |  |  | US$ | 1,400 |  |  | US$ | 1,300 |
US$ Gold price per ounce – year 4 onwards |  | US$ | 1,500 |  |  | US$ | 1,350 |  |  | US$ | 1,300 |
Rand Gold price per kilogram – year 1 |  | R | 900,000 |  |  | R | 700,000 |  |  | R | 525,000 |
Rand Gold price per kilogram – year 2 |  | R | 850,000 |  |  | R | 650,000 |  |  | R | 550,000 |
Rand Gold price per kilogram – year 3 |  | R | 800,000 |  |  | R | 650,000 |  |  | R | 550,000 |
Rand Gold price per kilogram – year 4 onwards |  | R | 750,000 |  |  | R | 630,000 |  |  | R | 550,000 |
A$ Gold price per ounce – year 1 |  | A$ | 2,190 |  |  | A$ | 2,150 |  |  | A$ | 1,600 |
A$ Gold price per ounce – year 2 |  | A$ | 2,300 |  |  | A$ | 1,970 |  |  | A$ | 1,700 |
A$ Gold price per ounce – year 3 |  | A$ | 2,200 |  |  | A$ | 1,970 |  |  | A$ | 1,700 |
A$ Gold price per ounce – year 4 onwards |  | A$ | 2,000 |  |  | A$ | 1,850 |  |  | A$ | 1,700 |
US$ Copper price per tonne – year 1 |  | US$ | 5,797 |  |  | US$ | 5,730 |  |  | US$ | 5,951 |
US$ Copper price per tonne – year 2 onwards |  | US$ | 6,612 |  |  | US$ | 6,612 |  |  | US$ | 6,612 |
Resource value per ounce (used to calculate the value beyond proved and probable reserves) |  |  |  |  |  |  |  |  |  |  |  |
•   South Africa (with infrastructure) |  | US$ | 6 |  |  | US$ | 16 |  |  | US$ | 17 |
•   Ghana (with infrastructure) |  | US$ | 76 |  |  | US$ | 70 |  |  | US$ | 44 |
•   Peru (with infrastructure) |  | US$ | 34 |  |  | US$ | 34 |  |  | US$ | 70 |
•   Australia (with infrastructure) |  | US$ | 88 |  |  | US$ | 77 |  |  | US$ | 28 |
•   Chile (without infrastructure) |  | US$ | 4 |  |  |  | — |  |  |  | — |
Discount rates |  |  |  |  |  |  |  |  |  |  |  |
•   South Africa – nominal |  |  | 14.5 | % |  |  | 14.1 | % |  |  | 13.5 | %
•   Ghana – real |  |  | 8.4 | % |  |  | 8.5 | % |  |  | 9.5 | %
•   Peru – real |  |  | 4.5 | % |  |  | 5.0 | % |  |  | 4.9 | %
•   Australia – real |  |  | 3.5 | % |  |  | 3.5 | % |  |  | 3.4 | %
•   Chile - real |  |  | 6.0 | % |  |  | — |  |  |  | — |
Inflation rate – South Africa 1 |  |  | 4.7 | % |  |  | 5.3 | % |  |  | 5.5 | %
Life-of-mine |  |  |  |  |  |  |  |  |  |  |  |
•   South Deep |  |  | 86 years |  |  |  | 75 years |  |  |  | 75 years |
•   Tarkwa |  |  | 14 years |  |  |  | 14 years |  |  |  | 14 years |
•   Damang |  |  | 5 years |  |  |  | 6 years |  |  |  | 7 years |
•   Cerro Corona |  |  | 10 years |  |  |  | 13 years |  |  |  | 12 years |
•   St Ives |  |  | 8 years |  |  |  | 9 years |  |  |  | 7 years |
•   Agnew |  |  | 5 years |  |  |  | 4 years |  |  |  | 4 years |
•   Granny Smith |  |  | 10 years |  |  |  | 13 years |  |  |  | 12 years |
•   Gruyere |  |  | 9 years |  |  |  | 11 years |  |  |  | 12 years |
•   Salares Norte |  |  | 12 years |  |  |  | — |  |  |  | — |
Long-term exchange rates |  |  |  |  |  |  |  |  |  |  |  |
US$/ZAR – year 1 |  |  | 17.50 |  |  |  | 14.50 |  |  |  | 13.61 |
US$/ZAR – year 2 onwards |  |  | 15.55 |  |  |  | 14.50 |  |  |  | 13.16 |
A$/US$ – year 1 |  |  | 0.76 |  |  |  | 0.70 |  |  |  | 0.75 |
A$/US$ – year 2 |  |  | 0.74 |  |  |  | 0.71 |  |  |  | 0.76 |
A$/US$ – year 3 |  |  | 0.73 |  |  |  | 0.71 |  |  |  | 0.76 |
A$/US$ – year 4 onwards |  |  | 0.75 |  |  |  | 0.73 |  |  |  | 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.
Summary of Key assumptions used in the Income and Market Approach | The key assumptions used in the income and market approach are as follows:
|  | 2020 |  |  | 2019 |
US$ Gold price per ounce – year 1 to 3 |  | US$ | 1,600 - US$1,800 |  |  | US$ | 1,400 - US$1,500 |
US$ Gold price per ounce – year 4 onwards |  | US$ | 1,500 |  |  | US$ | 1,350 |
Resource value per ounce (with infrastructure) |  | US$ | 76 |  |  | US$ | 70 |
Discount rates - real |  |  | 8.4 | % |  |  | 8.5 | %
Life-of-mine |  |  | 7 years |  |  |  | 10 years |

X
- Definition Disclosure of detailed information of key assumptions used in the income and market approach explanatory. + References No definition available. + Details
Name: | gfi_DisclosureOfDetailedInformationOfKeyAssumptionsUsedInTheIncomeAndMarketApproachExplanatory
Namespace Prefix: | gfi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Text block [abstract] + References No definition available. + Details
Name: | gfi_TextBlockAbstract
Namespace Prefix: | gfi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 2020-01-01 -Paragraph 130 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_130&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DisclosureOfInformationForEachMaterialImpairmentLossRecognisedOrReversedForIndividualAssetOrCashgeneratingUnitExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration