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Financial instruments (Tables)
12 Months Ended
Dec. 31, 2021
Disclosure of financial liabilities [abstract]  
Summary of derivative financial liabilities
United States Dollar
Figures in millions unless otherwise stated20212020
Salares Norte foreign currency derivative contracts6.8 — 
Ghanaian oil derivative contracts 10.0 
Australian oil derivative contracts 5.1 
Peruvian copper derivative contracts 14.0 
Total derivative financial liabilities6.8 29.1 
Non-current derivative financial liabilities1
 (7.3)
Derivative financial liabilities6.8 21.8 
1Relates to the Australian (US$2.6 million) and Ghanaian (US$4.7 million) oil derivative contracts which are for the period January 2022 to December 2022.