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v3.10.0.1

Fair value measurements (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) item | Dec. 31, 2017 USD ($)
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 |
Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value | 174,600,000 | $ 691,300,000
Recurring Basis | Level 1 |  |
Fair value measurements |  |
Financial assets, at fair value | 161,300,000 | 679,200,000
Recurring Basis | Level 2 |  |
Fair value measurements |  |
Financial assets, at fair value | 9,400,000 | 12,100,000
Recurring Basis | Level 3 |  |
Fair value measurements |  |
Financial assets, at fair value | 3,900,000 |
Cash and cash equivalents | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value |  | 511,100,000
Cash and cash equivalents | Recurring Basis | Level 1 |  |
Fair value measurements |  |
Financial assets, at fair value |  | 511,100,000
Receivables from provisional concentrate sales | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value | 8,600,000 | 11,300,000
Receivables from provisional concentrate sales | Recurring Basis | Level 2 |  |
Fair value measurements |  |
Financial assets, at fair value | $ 8,600,000 | 11,300,000
Equity investments |  |
Fair value measurements |  |
Number of investments with no quoted market price in an active market | item | 1 |
Equity investments | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value | $ 165,200,000 |
Equity investments | Recurring Basis | Level 1 |  |
Fair value measurements |  |
Financial assets, at fair value | 161,300,000 |
Equity investments | Recurring Basis | Level 3 |  |
Fair value measurements |  |
Financial assets, at fair value | 3,900,000 |
Available-for-sale | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value |  | 168,100,000
Available-for-sale | Recurring Basis | Level 1 |  |
Fair value measurements |  |
Financial assets, at fair value |  | 168,100,000
Warrants | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value | 800,000 | 800,000
Warrants | Recurring Basis | Level 2 |  |
Fair value measurements |  |
Financial assets, at fair value | $ 800,000 | $ 800,000

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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 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph 93 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_e_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of transfers of liabilities into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph 93 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_e_iv&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 93 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of liabilities 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 2017-01-01 -Paragraph 93 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of transfers out of Level 2 and into Level 1 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 2017-01-01 -Paragraph 93 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of transfers out of Level 2 and into Level 1 of the fair value hierarchy of liabilities 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 2017-01-01 -Paragraph 93 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of transfers of assets out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph 93 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_e_iv&doctype=Standard -URIDate 2017-03-09 + Details
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