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Summary of significant accounting policies (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure summary of significant accounting policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 100,604,000 | $ 201,907,000 | $ 111,180,000 | $ 127,727,000
Percentage Of Debt Maturing In Five Years Or Less | 97.00% |  |  |
Capitalisation rate of borrowing costs eligible for capitalisation |  |  | 6.90% |
Borrowing costs capitalised | $ 0 | 0 | $ 367,000 |
Write-off of Unsuccessful Exploration Efforts | 12,262,000 | 52,652,000 | 18,290,000 |
Impairment loss | $ 4,334,000 | $ 133,864,000 | $ 7,559,000 |
Maximum |  |  |  |
Disclosure summary of significant accounting policies [Line Items] |  |  |  |
Useful life measured as period of time, property, plant and equipment | 10 years |  |  |
Period of lease term | 7 years |  |  |
Minimum |  |  |  |
Disclosure summary of significant accounting policies [Line Items] |  |  |  |
Useful life measured as period of time, property, plant and equipment | 3 years |  |  |
Period of lease term | 1 year |  |  |

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2021-01-01 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=23&code=ifrs-tx-2021-en-r&anchor=para_26_a&doctype=Standard -URIDate 2021-03-24 + Details
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