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Provisions, contingent liabilities and other liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of provisions [Line Items] |  |
Balance at beginning of the year | $ 294,507 |
Changes (additions and deductions) | 50,798 |
Accretion expense | 6,848 |
Disbursements | (26,722) |
Sale of mining unit | (5,093) |
Balance at end of the year | 320,338 | $ 294,507
Classification by maturity [Abstract] |  |
Current portion | 68,000 | 72,771
Non-current portion | 252,338 | 221,736
Closure Of Mining Units And Exploration Projects [Member] |  |
Disclosure of provisions [Line Items] |  |
Balance at beginning of the year | 252,305 |
Changes (additions and deductions) | 32,200 |
Accretion expense | 6,848 |
Disbursements | (8,571) | (16,882)
Sale of mining unit | (5,093) |
Balance at end of the year | 277,689 | 252,305
Classification by maturity [Abstract] |  |
Current portion | 32,462 | 35,280
Non-current portion | 245,227 | 217,025
Bonus To Employees And Officers [Member] |  |
Disclosure of provisions [Line Items] |  |
Balance at beginning of the year | 19,226 |
Changes (additions and deductions) | 13,106 |
Accretion expense | 0 |
Disbursements | (15,119) |
Sale of mining unit | 0 |
Balance at end of the year | 17,213 | 19,226
Environmental Liabilities [Member] |  |
Disclosure of provisions [Line Items] |  |
Balance at beginning of the year | 6,305 |
Changes (additions and deductions) | (211) |
Accretion expense | 0 |
Disbursements | (1,056) |
Sale of mining unit | 0 |
Balance at end of the year | 5,038 | 6,305
Safety Contingencies [Member] |  |
Disclosure of provisions [Line Items] |  |
Balance at beginning of the year | 5,205 |
Changes (additions and deductions) | (598) |
Accretion expense | 0 |
Disbursements | (71) |
Sale of mining unit | 0 |
Balance at end of the year | 4,536 | 5,205
Labor Contingencies [Member] |  |
Disclosure of provisions [Line Items] |  |
Balance at beginning of the year | 3,777 |
Changes (additions and deductions) | 442 |
Accretion expense | 0 |
Disbursements | (139) |
Sale of mining unit | 0 |
Balance at end of the year | 4,080 | 3,777
Obligations With Communities [Member] |  |
Disclosure of provisions [Line Items] |  |
Balance at beginning of the year | 3,509 |
Changes (additions and deductions) | 96 |
Accretion expense | 0 |
Disbursements | 0 |
Sale of mining unit | 0 |
Balance at end of the year | 3,605 | 3,509
Tax contingencies |  |
Disclosure of provisions [Line Items] |  |
Balance at beginning of the year | 382 |
Changes (additions and deductions) | 2,728 |
Accretion expense | 0 |
Disbursements | 0 |
Sale of mining unit | 0 |
Balance at end of the year | 3,110 | 382
Environmental contingencies |  |
Disclosure of provisions [Line Items] |  |
Balance at beginning of the year | 1,500 |
Changes (additions and deductions) | 1,640 |
Disbursements | (266) |
Balance at end of the year | 2,874 | 1,500
Board of Directors' participation [Member] |  |
Disclosure of provisions [Line Items] |  |
Balance at beginning of the year | 1,594 |
Changes (additions and deductions) | 1,493 |
Accretion expense | 0 |
Disbursements | (1,500) |
Sale of mining unit | 0 |
Balance at end of the year | 1,587 | 1,594
Workers' profit sharing payable |  |
Disclosure of provisions [Line Items] |  |
Balance at beginning of the year | 69 |
Changes (additions and deductions) | 57 |
Accretion expense | 0 |
Disbursements | 0 |
Sale of mining unit | 0 |
Balance at end of the year | 126 | 69
Other Provisions |  |
Disclosure of provisions [Line Items] |  |
Balance at beginning of the year | 635 |
Changes (additions and deductions) | (155) |
Accretion expense | 0 |
Disbursements | 0 |
Sale of mining unit | 0 |
Balance at end of the year | $ 480 | $ 635

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