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Tax situation - Reconciliation of tax expense (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Income Tax Explanatory |  |  |  |
Income (loss) before income tax |  | $ (130,318) | $ (43,535) | $ 27,033
Peruvian statutory tax rate | 29.50% | 32.00% | 32.00% | 32.00%
Income tax expense (income) |  | $ (23,716) | $ 25,766 | $ (22,462)
Non-deductible expenses |  | (11,789) | (6,877) | (1,095)
Difference in income tax rate applicable to La Quinua at 29% |  | (31,853) | 14,995 | (15,248)
Total income tax |  | 25,430 | (25,590) | 26,879
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |
Disclosure Of Income Tax Explanatory |  |  |  |
Income (loss) before income tax |  | $ (112,431) | $ (30,329) | $ (52,220)
Peruvian statutory tax rate | 29.50% | 29.50% | 29.50% | 29.50%
Income tax expense (income) |  | $ (33,167) | $ (8,947) | $ (15,405)
Valuation allowance on deferred tax asset |  | 57,131 | 46,473 | 23,771
Effect of change in income tax rate |  | 23,075 | (4,217) | 0
Royalties and Mining taxes |  | 5,065 | 11,444 | 8,888
Credit of Royalties and Mining taxes |  | (1,494) | (3,376) | (2,622)
Non-deductible expenses |  | 7,015 | 13,837 | 6,572
Ruling on a tax case |  | (2,895) | (2,801) |
Income tax prior years refunds |  | (1,712) | 8,459 | 8,269
Difference in income tax rate applicable to La Quinua at 29% |  |  |  | (176)
Fines from prior years |  | 0 | 4,056 | 0
Total income tax |  | $ 53,018 | $ 64,928 | $ 29,297

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