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Fair value measurement - Hierarchy of assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of fair value measurement [line Items] |  |  |  |
Fair value of account receivable (subject to provisional pricing) | $ 126,553 | $ 165,546 |  |
Bank loans | 65,793 | 55,000 |  |
Financial obligations | 531,745 | 571,688 |  |
Contingent consideration liability | 22,100 | 16,410 | $ 15,755 | $ 17,570
Hedge instruments | 18,439 |  |  |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |
Disclosure of fair value measurement [line Items] |  |  |  |
Derivative financial asset liabilities | 101,434 | 36,705 |  |
Level 1 of fair value hierarchy [member] |  |  |  |
Disclosure of fair value measurement [line Items] |  |  |  |
Fair value of account receivable (subject to provisional pricing) | 0 | 0 |  |
Bank loans | 0 | 0 |  |
Financial obligations | 0 | 0 |  |
Contingent consideration liability | 0 | 0 |  |
Hedge instruments | 0 | 0 |  |
Level 2 of fair value hierarchy [member] |  |  |  |
Disclosure of fair value measurement [line Items] |  |  |  |
Fair value of account receivable (subject to provisional pricing) | 126,553 | 165,546 |  |
Bank loans | 65,793 | 55,000 |  |
Financial obligations | 531,745 | 571,688 |  |
Hedge instruments | 18,439 |  |  |
Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of fair value measurement [line Items] |  |  |  |
Fair value of account receivable (subject to provisional pricing) | 0 | 0 |  |
Bank loans | 0 | 0 |  |
Financial obligations | 0 | 0 |  |
Contingent consideration liability | 22,100 | 16,410 |  |
Hedge instruments | $ 0 | $ 0 |  |

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- Definition The amount of fair value of bank loans of the company. + References No definition available. + Details
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- Definition The amount of derivative financial assets(liabilities) + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of Fair Value of Accounts Receivables. + References No definition available. + Details
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- Definition The amount of contingent liabilities recognised in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B67 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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- Definition The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities] + 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 + Details
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