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Intangible assets and goodwill (Details 4) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | $ 223,084 | $ 224,216
Additions | 10,255 | 2,856
Other increases / decreases for foreign currency exchange rates | 6 | (6)
Decreases through sale | (136) | (1,314)
Impairment losses recognized in profit for the year | (1,798) | (1,053)
Other increases (decreases) | 309 | 2,479
Amortization | (11,347) | (4,094)
Total increases (decreases) | (2,711) | (1,132)
Closing balance | 220,373 | 223,084
Gross carrying amount [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 260,317 | 256,049
Additions | 10,255 | 2,856
Other increases / decreases for foreign currency exchange rates | 6 | (9)
Decreases through sale | (136) | (1,314)
Other increases (decreases) | 311 | 2,735
Total increases (decreases) | 10,436 | 4,268
Closing balance | 270,753 | 260,317
Accumulated depreciation and amortisation [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (37,233) | (31,833)
Other increases / decreases for foreign currency exchange rates | 0 | 3
Impairment losses recognized in profit for the year | (1,798) | (1,053)
Other increases (decreases) | (2) | (256)
Amortization | (11,347) | (4,094)
Total increases (decreases) | (13,147) | (5,400)
Closing balance | (50,380) | (37,233)
Indeifinite Intangible assets [Member] | Goodwill [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 34,726 | 34,866
Additions | 7,380 | 0
Other increases / decreases for foreign currency exchange rates | 0 | 0
Decreases through sale | 0 | 0
Impairment losses recognized in profit for the year | (140) | (140)
Other increases (decreases) | 0 | 0
Amortization | 0 | 0
Total increases (decreases) | 7,240 | (140)
Closing balance | 41,966 | 34,726
Indeifinite Intangible assets [Member] | Gross carrying amount [member] | Goodwill [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 38,120 | 38,120
Additions | 7,380 | 0
Other increases / decreases for foreign currency exchange rates | 0 | 0
Other increases (decreases) | 0 | 0
Total increases (decreases) | 7,380 | 0
Closing balance | 45,500 | 38,120
Indeifinite Intangible assets [Member] | Accumulated depreciation and amortisation [member] | Goodwill [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (3,394) | (3,254)
Other increases / decreases for foreign currency exchange rates | 0 | 0
Impairment losses recognized in profit for the year | (140) | (140)
Other increases (decreases) | 0 | 0
Amortization | 0 | 0
Total increases (decreases) | (140) | (140)
Closing balance | (3,534) | (3,394)
IT programs [member] | Finite intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 6,011 | 4,568
Additions | 508 | 2,606
Other increases / decreases for foreign currency exchange rates | 5 | (4)
Decreases through sale | 0 | 0
Impairment losses recognized in profit for the year | (14) | 0
Other increases (decreases) | 297 | 2,479
Amortization | (1,981) | (3,638)
Total increases (decreases) | (1,185) | 1,443
Closing balance | 4,826 | 6,011
IT programs [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 34,471 | 29,137
Additions | 508 | 2,606
Other increases / decreases for foreign currency exchange rates | 5 | (7)
Decreases through sale | 0 | 0
Other increases (decreases) | 297 | 2,735
Total increases (decreases) | 810 | 5,334
Closing balance | 35,281 | 34,471
IT programs [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (28,460) | (24,569)
Other increases / decreases for foreign currency exchange rates | 0 | 3
Impairment losses recognized in profit for the year | (14) | 0
Other increases (decreases) | 0 | (256)
Amortization | (1,981) | (3,638)
Total increases (decreases) | (1,995) | (3,891)
Closing balance | (30,455) | (28,460)
Mining rights [Member] | Finite intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 157,570 | 159,256
Additions | 2,295 | 227
Other increases / decreases for foreign currency exchange rates | 0 | 0
Decreases through sale | (136) | (1,314)
Impairment losses recognized in profit for the year | (654) | (481)
Other increases (decreases) | (2) | 0
Amortization | (9,027) | (118)
Total increases (decreases) | (7,524) | (1,686)
Closing balance | 150,046 | 157,570
Mining rights [Member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 158,337 | 159,424
Additions | 2,295 | 227
Other increases / decreases for foreign currency exchange rates | 0 | 0
Decreases through sale | (136) | (1,314)
Other increases (decreases) | 0 | 0
Total increases (decreases) | 2,159 | (1,087)
Closing balance | 160,496 | 158,337
Mining rights [Member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (767) | (168)
Other increases / decreases for foreign currency exchange rates | 0 | 0
Impairment losses recognized in profit for the year | (654) | (481)
Other increases (decreases) | (2) | 0
Amortization | (9,027) | (118)
Total increases (decreases) | (9,683) | (599)
Closing balance | (10,450) | (767)
Water rights and rights of way [member] | Indeifinite Intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 23,342 | 23,776
Additions | 0 | 0
Other increases / decreases for foreign currency exchange rates | 1 | (2)
Decreases through sale | 0 |
Impairment losses recognized in profit for the year | 0 | (432)
Other increases (decreases) | 0 | 0
Amortization | 0 | 0
Total increases (decreases) | 1 | (434)
Closing balance | 23,343 | 23,342
Water rights and rights of way [member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 25,423 | 25,425
Additions | 0 | 0
Other increases / decreases for foreign currency exchange rates | 1 | (2)
Decreases through sale | 0 | 0
Other increases (decreases) | 0 | 0
Total increases (decreases) | 1 | (2)
Closing balance | 25,424 | 25,423
Water rights and rights of way [member] | Indeifinite Intangible assets [Member] | Accumulated depreciation and amortisation [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (2,081) | (1,649)
Other increases / decreases for foreign currency exchange rates | 0 | 0
Impairment losses recognized in profit for the year | 0 | (432)
Other increases (decreases) | 0 | 0
Amortization | 0 | 0
Total increases (decreases) | 0 | (432)
Closing balance | (2,081) | (2,081)
Customer-related intangible assets [member] | Finite intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 1,273 | 1,573
Additions | 0 | 0
Other increases / decreases for foreign currency exchange rates | 0 | 0
Decreases through sale | 0 | 0
Impairment losses recognized in profit for the year | (990) | 0
Other increases (decreases) | 0 | 0
Amortization | (283) | (300)
Total increases (decreases) | (1,273) | (300)
Closing balance | 0 | 1,273
Customer-related intangible assets [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 1,778 | 1,778
Additions | 0 | 0
Other increases / decreases for foreign currency exchange rates | 0 | 0
Decreases through sale | 0 | 0
Other increases (decreases) | 0 | 0
Total increases (decreases) | 0 | 0
Closing balance | 1,778 | 1,778
Customer-related intangible assets [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (505) | (205)
Other increases / decreases for foreign currency exchange rates | 0 | 0
Impairment losses recognized in profit for the year | (990) | 0
Other increases (decreases) | 0 | 0
Amortization | (283) | (300)
Total increases (decreases) | (1,273) | (300)
Closing balance | (1,778) | (505)
Other Intangible Assets [Member] | Finite intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 162 | 177
Additions | 72 | 23
Other increases / decreases for foreign currency exchange rates | 0 | 0
Decreases through sale | 0 | 0
Impairment losses recognized in profit for the year | 0 | 0
Other increases (decreases) | 14 | 0
Amortization | (56) | (38)
Total increases (decreases) | 30 | (15)
Closing balance | 192 | 162
Other Intangible Assets [Member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 2,188 | 2,165
Additions | 72 | 23
Other increases / decreases for foreign currency exchange rates | 0 | 0
Decreases through sale | 0 | 0
Other increases (decreases) | 14 | 0
Total increases (decreases) | 86 | 23
Closing balance | 2,274 | 2,188
Other Intangible Assets [Member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (2,026) | (1,988)
Other increases / decreases for foreign currency exchange rates | 0 | 0
Impairment losses recognized in profit for the year | 0 | 0
Other increases (decreases) | 0 | 0
Amortization | (56) | (38)
Total increases (decreases) | (56) | (38)
Closing balance | $ (2,082) | $ (2,026)

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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