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Financial Instruments and Financial Risk Management - Summary of Provisionally Valued Outstanding Receivable And Payable Positions (Detail) lb in Millions | 12 Months Ended
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Dec. 31, 2021 USD_per_Pound USD_per_LB lb | Dec. 31, 2020 USD_per_Pound USD_per_LB lb
Zinc |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
US$/lb. | USD_per_LB | 1.62 | 1.24
Receivable positions | Copper |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 156 | 132
US$/lb. | USD_per_Pound | 4.42 | 3.52
Receivable positions | Zinc |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 175 | 142
US$/lb. | USD_per_Pound | 1.62 | 1.24
Receivable positions | Lead |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 53 | 42
US$/lb. | USD_per_Pound | 1.06 | 0.90
Payable positions | Zinc |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 63 | 112
US$/lb. | USD_per_Pound | 1.62 | 1.24
Payable positions | Lead |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 10 | 19
US$/lb. | USD_per_Pound | 1.06 | 0.90

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