Contingent Liabilities	12 Months Ended
Contingent Liabilities	Dec. 31, 2021
Disclosure of contingent liabilities [abstract]
Contingent Liabilities	CONTINGENT LIABILITIES Randgold and Exploration summons On 21 August 2008, Gold Fields Operations Limited, or GFO, formerly known as Western Areas Limited, a subsidiary of Gold Fields, received a summons from Randgold and Exploration Company Limited, or R&E, and African Strategic Investment (Holdings) Limited. The summons claims that during the period that GFO was under the control of Brett Kebble, Roger Kebble and others, GFO assisted in the unlawful disposal of shares owned by R&E in Randgold Resources Limited, or Resources, and Afrikander Lease Limited, now Uranium One. The claims have been computed in various ways. The highest claims have been computed on the basis of the highest prices of Resources and Uranium One shares between the dates of the alleged thefts and May 2017 (approximately R43.7 billion). The alternative claims are computed based on the value of the shares as at the date of judgment (which is not yet calculable), plus dividend amounts that would have been received and based on the market value of the shares at the time they were allegedly misappropriated, plus dividends that would have been received (cumulatively equating to approximately R26.9 billion). Simultaneously with delivering its plea, GFO joined certain third parties to the action (namely JCI Limited, JC Lamprecht, RAR Kebble and the deceased and insolvent estate of BK Kebble), in order to enable it to claim compensation against such third parties in the event that the plaintiffs are successful in one or more of their claims. In addition, notices in terms of section 2(2)(b) of the Apportionment of Damages Act, 1956 were served on various parties by GFO, in order to enable it to make a claim for a contribution against such parties in terms of the Apportionment of Damages Act, should the plaintiffs be successful in one or more of its claims. The matter has been allocated to the commercial court of the Gauteng Local Division, Johannesburg, as a result of which it will be case managed by the Judge assigned to the matter, in order to ensure that it progresses expeditiously to trial. GFO’s assessment is that it has sustainable defences to these claims and, accordingly, GFO’s attorneys have been instructed to vigorously defend the claims. The ultimate outcome of the claims cannot presently be determined and, accordingly, no adjustment for any effects on the Group that may result from these claims, if any, has been made in the consolidated financial statements. Silicosis Class action settlement The Tshiamiso Trust has been established to carry out the terms of the class action settlement agreement reached between six gold mining companies (including Gold Fields) and claimant attorneys in the silicosis and TB class action. The Tshiamiso Trust is responsible for ensuring that all eligible current and former mineworkers across southern Africa with silicosis or work-related TB (or their dependants where the mineworker has passed away) are compensated pursuant to the silicosis and TB class action settlement agreement. Financial provision Gold Fields has provided for the estimated cost of the class action settlement based on actuarial assessments and the provisions of the Settlement Agreement. At 31 December 2021, the provision for Gold Fields’ share of the settlement of the class action claims and related costs amounts to US$13.1 million (R209.6 million) (2020: US$18.3 million (R268.6 million)). The nominal value of this provision is US$16.9 million (R269.8 million). The ultimate outcome of this matter however remains uncertain, with the number of eligible workers successfully submitting claims and receiving compensation being uncertain. The provision is consequently subject to adjustment in the future. Notes to the Consolidated Financial Statements continued for the year ended 31 December 2021 35. CONTINGENT LIABILITIES continued Acid mine drainage Acid mine drainage (“AMD”) or acid rock drainage (“ARD”), collectively called acid drainage (“AD”) is formed when certain sulphide minerals in rocks are exposed to oxidising conditions (such as the presence of oxygen, combined with water). AD can occur under natural conditions or as a result of the sulphide minerals that are encountered and exposed to oxidation during mining or during storage in waste rock dumps, ore stockpiles or tailings storage facilities. The acidic water that forms usually contains iron and other metals if they are contained in the host rock. Gold Fields has identified incidences of AD, and the risk of potential short-term and long-term AD issues, specifically at its Cerro Corona, South Deep and St Ives mines. Gold Fields commissioned additional technical studies during 2015 to 2021 to identify the steps required to prevent or mitigate the potentially material AD impacts at Cerro Corona but none of these studies have allowed Gold Fields to generate a reliable estimate of the total potential impact on the Group. South Deep have concluded technical studies which have indicated that, subject to the implementation of targeted mitigation measures and no regional hydrogeological changes, AD generation will be mitigated and/or contained, thus resulting in no potential residual environmental risk. St Ives has initiated technical investigations into potential AD generation, identified as part of progressive rehabilitation activities, at the Cave Rocks landform and open pit. Gold Fields’ mine closure cost estimates for 2021 contain costs for the aspects of AD management which the Group has reliably been able to estimate. Gold Fields continues to investigate technical solutions at Cerro Corona, to better inform appropriate short- and long-term mitigation strategies for AD management and to work towards a reasonable cost estimate of potential issues. South Deep continues to implement required mitigation measures to prevent AD, which have been included in their 2021 closure cost estimates and/or business plans. Due to the inherent uncertainty on the outcome of the cessation of dewatering of Cooke 4 (Ezulwini) over which South Deep does not have control, together with the application made by Rand Uranium (a subsidiary of Sibanye Stillwater) for the closure of Cooke 3, 2 and 1 shafts, which would result in the rewatering of these shafts, along with other possible hydrogeological influences unrelated to South Deep in the future, the post closure water liability continues to be a contingent liability. Gold Fields is investigating the AD potential and risk at St Ives (Cave Rocks) and water quality monitoring programmes continue at Cerro Corona, South Deep and St Ives. No adjustment for any effects on the Group that may result from AD, if any, has been made in the consolidated financial statements other than through the Group’s normal environmental rehabilitation costs provision (refer note 25.1).