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v3.20.2

Fair value measurements (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 USD ($) EquityInstruments | Dec. 31, 2019 USD ($)
Fair value measurements |  |
Transfer from Level 1 to 2 of financial assets | $ 0 |
Transfer from Level 2 to 1 of financial assets | 0 |
Transfer from Level 1 to 2 of financial liabilities | 0 |
Transfer from Level 2 to 1 of financial liabilities | 0 |
Transfers Into Level 3 of financial assets | 0 |
Transfers Out of Level 3 of financial assets | 0 |
Transfers Into Level 3 of financial liabilities | 0 |
Transfers Out of Level 3 of financial liabilities | 0 |
Assets | $ 5,182,200,000 | $ 5,280,600,000
Number of investments with no quoted market price in an active market | EquityInstruments | 1 |
Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value | $ 160,000,000 | 165,000,000
Recurring Basis | Level 1 |  |
Fair value measurements |  |
Financial assets, at fair value | 137,300,000 | 141,700,000
Recurring Basis | Level 2 |  |
Fair value measurements |  |
Financial assets, at fair value | 18,900,000 | 19,400,000
Recurring Basis | Level 3 |  |
Fair value measurements |  |
Financial assets, at fair value | 3,800,000 | 3,900,000
Receivables from provisional concentrate sales | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value | 16,000,000 | 16,400,000
Receivables from provisional concentrate sales | Recurring Basis | Level 2 |  |
Fair value measurements |  |
Financial assets, at fair value | 16,000,000 | 16,400,000
Equity investments | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value | 141,100,000 | 145,600,000
Equity investments | Recurring Basis | Level 1 |  |
Fair value measurements |  |
Financial assets, at fair value | 137,300,000 | 141,700,000
Equity investments | Recurring Basis | Level 3 |  |
Fair value measurements |  |
Financial assets, at fair value | 3,800,000 | 3,900,000
Warrants | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value | 2,900,000 | 3,000,000
Warrants | Recurring Basis | Level 2 |  |
Fair value measurements |  |
Financial assets, at fair value | $ 2,900,000 | $ 3,000,000

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- Definition Expiry date 2020-01-01: The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity. Effective 2020-01-01: The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 28 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_28_c&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_b&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_e&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 23 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_23&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_c&doctype=Standard -URIDate 2019-03-27 + Details
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