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Exploration Expense (Tables)
 12 Months Ended
Dec. 31, 2023
Exploration Expenses Disclosure [Abstract]  
Summary of exploration expenses
United States Dollar
Figures in millions unless otherwise stated
2023
2022
2021
Australia
(33.4)
(33.6)
(21.3)
Ghana
(9.0)
(12.1)
(9.6)
Peru
(3.9)
(2.8)
(1.6)
Chile
(29.3)
(32.3)
(27.2)
Other
(0.6)
(0.2)
(0.9)
Total exploration expense
(76.2)
(81.0)
(60.6)