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SEGMENTED INFORMATION - Geographic segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Segmented Information |  |
Metal sales | $ 4,213.4 | $ 3,497.3
Property, plant and equipment | 7,653.5 | 6,340.0
United States |  |
Segmented Information |  |
Metal sales | 1,318.9 | 1,031.0
Property, plant and equipment | 2,043.7 | 1,765.0
Russia |  |
Segmented Information |  |
Metal sales | 904.6 | 734.4
Property, plant and equipment | 604.0 | 337.4
Brazil |  |
Segmented Information |  |
Metal sales | 960.7 | 856.3
Property, plant and equipment | 1,721.5 | 1,749.3
Chile |  |
Segmented Information |  |
Metal sales | 16.1 | 61.2
Property, plant and equipment | 653.5 | 394.1
Mauritania |  |
Segmented Information |  |
Metal sales | 718.0 | 532.8
Property, plant and equipment | 2,289.2 | 1,932.4
Ghana |  |
Segmented Information |  |
Metal sales | 295.1 | 281.6
Property, plant and equipment | $ 341.6 | $ 161.8

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_a&doctype=Standard -URIDate 2020-01-01 + Details
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