Fair value measurements (Details)	6 Months Ended
Jun. 30, 2021 USD ($) EquityInstruments	Dec. 31, 2020 USD ($)
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
Number of investments with no quoted market price in an active market \| EquityInstruments	1
Recurring Basis
Fair value measurements
Financial assets, at fair value	$ 278,200,000	$ 211,400,000
Recurring Basis \| Level 1
Fair value measurements
Financial assets, at fair value	262,300,000	191,800,000
Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	11,700,000	15,800,000
Recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	4,200,000	3,800,000
Receivables from provisional concentrate sales \| Recurring Basis
Fair value measurements
Financial assets, at fair value	8,400,000	10,100,000
Receivables from provisional concentrate sales \| Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	8,400,000	10,100,000
Equity investments \| Recurring Basis
Fair value measurements
Financial assets, at fair value	266,500,000	195,600,000
Equity investments \| Recurring Basis \| Level 1
Fair value measurements
Financial assets, at fair value	262,300,000	191,800,000
Equity investments \| Recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	4,200,000	3,800,000
Warrants \| Recurring Basis
Fair value measurements
Financial assets, at fair value	3,300,000	5,700,000
Warrants \| Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	$ 3,300,000	$ 5,700,000

The number of investments with no quoted market price in an active market.

No definition available.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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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 2020-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard
-URIDate 2020-01-01

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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 2020-01-01
-Paragraph 93
-Subparagraph e
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iv&doctype=Standard
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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

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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 2020-01-01
-Paragraph 93
-Subparagraph c
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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

+ 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

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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

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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

+ Details

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- Definition

The amount of transfers of liabilities out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

+ References

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