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Exploration in operating units (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Beginning balance of finished goods and products in process, net of depreciation and amortization | $ 444 | $ 2,837 | $ 5,157
Total exploration in operating units | 28,896 | 41,770 | 87,410
Final balance of products in process and finished goods, net of depreciation and amortization | 1,296 | 444 | 2,837
Exploration in operating units | 28,044 | 44,163 | 89,730
Services provided by third parties |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Exploration in operating units | 20,406 | 33,591 | 71,513
Consumption of materials and supplies [Member] |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Exploration in operating units | 1,426 | 3,712 | 8,594
Direct labor |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Exploration in operating units | 3,361 | 1,747 | 2,349
Purchase of land [Member] |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Exploration in operating units | 2,162 |  |
Short-term and low-value lease [Member] |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Exploration in operating units | 766 | 1,186 | 2,065
Electricity and water [Member] |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Exploration in operating units | 471 | 905 | 1,337
Maintenance and repair [Member] |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Exploration in operating units | 9 | 10 | 450
Transport [Member] |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Exploration in operating units | 12 | 71 | 192
Others [Member] |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Exploration in operating units | $ 283 | $ 548 | $ 910

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