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Trade and Other Receivables - Schedule of Trade and Other Receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Trade and other receivables [abstract]    
Trade receivables – gold sales and copper concentrate $ 69.9 $ 40.7
Trade receivables – other 6.7 9.1
Deposits 0.1 0.1
Payroll receivables 9.3 5.3
Prepayments 108.2 106.4
Value Added Tax and import duties 62.9 74.3
Diesel rebate 1.0 0.9
Other 5.6 3.3
Trade and other receivables $ 263.7 $ 240.1