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Related parties - Transactions with related entities that affected results (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues |  |  |  |
Demurrage |  |  |  | $ 524
Reimbursement |  |  |  | 76
Total revenues |  |  |  | 600
Expenses |  |  |  |
Supplies |  | $ 55 | $ 9 | 44
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |
Revenues |  |  |  |
Supplies |  | 768 |  |
Demurrage |  | 226 | 688 |
Reimbursement |  |  | 491 |
Total revenues |  | 994 | 1,179 |
Expenses |  |  |  |
Reimbursement of information technology services |  | 15,900 | 11,533 | 11,836
Commissions |  | 7,801 | 8,953 | 8,292
Stock-based compensation (a) | [1] | 2,259 | 1,560 | 1,174
Management fee |  | 2,159 | 2,923 | 2,743
Supplies |  | 492 | 908 | 1,133
Fixed assets and spare parts |  |  |  | 14,265
Total expenses |  | $ 28,611 | $ 25,877 | $ 39,443
[1] | As indicated in the table above, during 2020, 2019 and 2018 stock-based compensation expense totaled US$2.3 million, US$1.6 million and US$1.2 million and the related payments/vesting totaled US$0.8 million, US$0.4 million and US$0.5

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- Definition The amount of commission expenses incurred by the entity in related party transactions. + References No definition available. + Details
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- Definition The aggregate amount of expenses incurred by the entity in related party transactions. + References No definition available. + Details
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- Definition The amount of management fee expenses incurred by the entity in related party transactions. + References No definition available. + Details
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Balance Type: | debit
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- Definition The amount of reimbursement expenses incurred by the entity in related party transactions. + References No definition available. + Details
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- Definition The aggregate amount of revenue arising from related party transactions. + References No definition available. + Details
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- Definition The amount of revenue arising from sale of supplies in related party transactions. + References No definition available. + Details
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- Definition The amount of stock based compensation expenses incurred by the entity in related party transactions. + References No definition available. + Details
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- Definition The amount of goods purchased by the entity in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 21 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_21_a&doctype=Standard -URIDate 2020-01-01 + Details
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