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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Revenue |  |
Metal sales | $ 4,213.4 | $ 3,497.3
Cost of sales |  |
Production cost of sales | 1,725.7 | 1,778.9
Depreciation, depletion and amortization | 842.3 | 731.3
Reversals of impairment charges - net | (650.9) | (361.8)
Total cost of sales | 1,917.1 | 2,148.4
Gross profit | 2,296.3 | 1,348.9
Other operating expense | 186.5 | 108.5
Exploration and business development | 92.5 | 113.5
General and administrative | 117.9 | 135.8
Operating earnings | 1,899.4 | 991.1
Other income - net | 7.4 | 72.7
Finance income | 4.3 | 7.9
Finance expense | (112.6) | (107.9)
Earnings before tax | 1,798.5 | 963.8
Income tax expense - net | (439.8) | (246.7)
Net earnings | 1,358.7 | 717.1
Net earnings (loss) attributable to: |  |
Non-controlling interests | 16.3 | (1.5)
Common shareholders | $ 1,342.4 | $ 718.6
Earnings per share attributable to common shareholders |  |
Basic | $ 1.07 | $ 0.57
Diluted | $ 1.06 | $ 0.57
Weighted average number of common shares outstanding |  |
Basic | 1,257,163 | 1,252,316
Diluted | 1,267,970 | 1,262,344

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- Definition The amount of expense relating to selling, general and administrative activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_b&doctype=Standard -URIDate 2020-01-01 + Details
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- References No definition available. + Details
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- Definition The amount of exploration and business development cost. + References No definition available. + Details
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- Definition The amount of production costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories + References No definition available. + Details
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