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Other, net (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | $ 53,767,000 | $ 77,000,000 | $ 102,599,000
Other Operating Expense |  | (51,077,000) | (91,715,000) | (103,907,000)
Other operating income expense net |  | 2,690,000 | (14,715,000) | (1,308,000)
Loss for the year |  | (150,339,000) | (28,459,000) | (11,654,000)
Proceeds from insurance claim |  | 4,381,000 | 0 | 38,793,000
Associated Costs for Mitigation and Repairs |  |  |  | 5,058,000
loss on sale of investment in subsidiary | $ 4,100,000 |  |  |
Disposal cost of sale of supplies and merchandise to third parties [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other Operating Expense |  | (26,463,000) | (33,664,000) | (57,897,000)
Provision for impairment of spare parts and supplies, note 8(c) [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other Operating Expense |  | (17,266,000) | (15,703,000) | (11,704,000)
Direct expenses [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other Operating Expense |  | (3,311,000) | (15,992,000) | (9,867,000)
Expenses from previous years [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other Operating Expense |  | (1,402,000) | (2,240,000) | (1,831,000)
Disposal cost of sale of supplies and merchandise to related parties [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other Operating Expense |  | (1,211,000) | (2,944,000) | (257,000)
Changes in provisions for exploration projects, note 15(b) [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other Operating Expense |  | (642,000) | (4,020,000) | 0
Withdrawals and disposals of property, machinery and equipment, note 11(a) [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other Operating Expense |  | (586,000) | (2,926,000) | (6,626,000)
Net cost of property, machinery and equipment to third parties, note 11(a) [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other Operating Expense |  | (192,000) | (4,965,000) | (626,000)
Allowance for expected credit losses, note 7(f) [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other Operating Expense |  | (4,000) | (25,000) | (1,334,000)
Net cost of transfer of investments (c) [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other Operating Expense |  | 0 | 0 | (11,178,000)
Other minor [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other Operating Expense |  | 0 | (9,236,000) | (2,587,000)
Sale of supplies and merchandise to third parties [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 19,581,000 | 32,228,000 | 46,128,000
Reversal for impairment of spare parts and supplies, note 8(c) [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 15,762,000 | 11,641,000 | 4,665,000
Sale of services to third parties [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 5,626,000 | 6,415,000 | 3,512,000
Insurance claim recovery (b) [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 4,381,000 | 0 | 33,735,000
Revenue from commercial claims [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 3,800,000 | 2,098,000 | 0
Sale of assets to third parties [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 1,356,000 | 19,405,000 | 3,863,000
Sale of supplies to related parties, note 30(a) [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 890,000 | 1,259,000 | 27,000
Income from previous years [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 475,000 | 1,311,000 | 1,504,000
Sale of investment in subsidiary [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 250,000 | 0 | 7,097,000
Sale of assets to related parties, note 30(a) [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 0 | 11,000 | 30,000
Changes in provisions for exploration projects [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 0 | 0 | 2,433,000
Recovery of expenses from previous years [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 0 | 0 | 81,000
Income from rental of investment properties [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 0 | 0 | 45,000
Expiration of allowance for expected credit losses, note 7(f) [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | 0 | 0 | 45,000
Other minor [Member] |  |  |  |
Disclosure of Other net [Line Items] |  |  |  |
Other operating incomes |  | $ 1,646,000 | $ 2,632,000 | $ (566,000)

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