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Provisions, contingent liabilities and other liabilities - Provision for remediation and mine closure (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Provisions and contingent liabilities
Changes in estimates, Note 7	$ 41,100
Provision for remediation and mine closure [Member]
Provisions and contingent liabilities
Beginning balance	131,888	$ 156,859	$ 153,313
Accretion expense	4,048	4,322	4,595
Changes in estimates, Note 7	41,130	(32,017)	(3,710)
Additions, Note 7	18,834	2,724	2,661
Final balance	$ 195,900	$ 131,888	$ 156,859

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- Definition

Provisions and contingent liabilities

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- Definition

The amount of additional other provisions made. [Refer: Other provisions]

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- Definition

The increase in other provisions through adjustments arising from the passage of time. [Refer: Other provisions]

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- Definition

The increase (decrease) in other provisions resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Other provisions]

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- Definition

The amount of non-current provisions other than provisions for employee benefits. [Refer: Non-current provisions]

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