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Intangible assets and goodwill (Details 4) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | $ 151,759,000 | $ 147,411,000 | $ 148,816,000
Additions | 78,376,000 | 1,118,000 | 2,285,000
Increases (decreases) for transfers | 0 | (205,000) |
Other increases / decreases for foreign currency exchange rates | (6,000) |  |
Impairment | (5,195,000) | 0 |
Transferred to available for sale | 0 |  |
Other increases (decreases) | 1,070,000 | (1,319,000) | (856,000)
Amortization | (3,003,000) | (2,691,000) | (2,834,000)
Total increases (decreases) | 71,242,000 | (3,097,000) |
Final balance | 223,001,000 | 151,759,000 | 147,411,000
Finite intangible assets [Member] | Goodwill [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 37,972,000 |  |
Additions | 0 |  |
Increases (decreases) for transfers | 0 |  |
Other increases / decreases for foreign currency exchange rates | 0 |  |
Impairment | (3,254,000) |  |
Transferred to available for sale | 0 |  |
Other increases (decreases) | 0 |  |
Amortization | 0 |  |
Total increases (decreases) | (3,254,000) |  |
Final balance | 34,718,000 | 37,972,000 |
Gross carrying amount [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 172,589,000 | 164,668,000 | 167,059,000
Additions | 78,376,000 | 1,118,000 | 2,285,000
Increases (decreases) for transfers | 0 | (205,000) |
Other increases / decreases for foreign currency exchange rates | (10,000) |  |
Impairment | 0 | 0 |
Transferred to available for sale | 0 |  |
Other increases (decreases) | 3,880,000 | (437,000) | (4,676,000)
Total increases (decreases) | 82,246,000 | 476,000 |
Final balance | 254,835,000 | 172,589,000 | 164,668,000
Accumulated depreciation and amortisation [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | (20,830,000) | (17,257,000) | (18,243,000)
Additions | 0 | 0 | 0
Other increases / decreases for foreign currency exchange rates | 4,000 |  |
Impairment | (5,195,000) |  |
Other increases (decreases) | (2,810,000) | (882,000) | 3,820,000
Amortization | (3,003,000) | (2,691,000) | (2,834,000)
Total increases (decreases) | (11,004,000) | (3,573,000) |
Final balance | (31,834,000) | (20,830,000) | (17,257,000)
Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 0 |  |
Additions | 0 |  |
Other increases / decreases for foreign currency exchange rates | 0 |  |
Impairment | (1,729,000) |  |
Other increases (decreases) | 0 |  |
Amortization | (88,000) |  |
Total increases (decreases) | (1,817,000) |  |
Final balance | (1,817,000) | 0 |
Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] | Goodwill [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 0 |  |
Additions | 0 |  |
Other increases / decreases for foreign currency exchange rates | 0 |  |
Impairment | (3,254,000) |  |
Other increases (decreases) | 0 |  |
Amortization | 0 |  |
Total increases (decreases) | (3,254,000) |  |
Final balance | (3,254,000) | 0 |
Indeifinite Intangible assets [Member] | Goodwill [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 37,972,000 | 37,972,000 | 38,388,000
Additions |  | 0 | 0
Increases (decreases) for transfers |  | 0 |
Impairment |  | 0 |
Other increases (decreases) |  | 0 | (416,000)
Amortization |  | 0 | 0
Total increases (decreases) |  | 0 |
Final balance |  | 37,972,000 | 37,972,000
Indeifinite Intangible assets [Member] | Gross carrying amount [member] | Goodwill [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 37,972,000 | 37,972,000 | 38,388,000
Additions | 0 | 0 | 0
Increases (decreases) for transfers | 0 | 0 |
Other increases / decreases for foreign currency exchange rates | 0 |  |
Impairment | 0 | 0 |
Transferred to available for sale | 0 |  |
Other increases (decreases) | 0 | 0 | (416,000)
Total increases (decreases) | 0 | 0 |
Final balance | 37,972 | 37,972,000 | 37,972,000
Indeifinite Intangible assets [Member] | Accumulated depreciation and amortisation [member] | Goodwill [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 0 | 0 | 0
Additions |  | 0 | 0
Other increases (decreases) |  | 0 | 0
Amortization |  | 0 | 0
Total increases (decreases) |  | 0 |
Final balance |  | 0 | 0
Brand names [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance |  | 0 | 0
Additions |  |  | 0
Other increases (decreases) |  |  | 0
Amortization |  |  | 0
Final balance |  |  | 0
Brand names [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 25,060,000 | 0 | 3,821,000
Additions | 1,159,000 |  | 0
Increases (decreases) for transfers | 0 |  |
Other increases / decreases for foreign currency exchange rates | (5,000) |  |
Impairment | 0 |  |
Transferred to available for sale | 0 |  |
Other increases (decreases) | 2,619,000 |  | (3,821,000)
Total increases (decreases) | 3,773,000 |  |
Final balance | 28,833,000 | 25,060,000 | 0
Brand names [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance |  | 0 | (3,821,000)
Additions |  |  | 0
Other increases (decreases) |  |  | 3,821,000
Amortization |  |  | 0
Final balance |  |  | 0
Computer software [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 5,291,000 | 7,046,000 | 9,813,000
Additions | 1,159,000 | 939,000 | 160,000
Increases (decreases) for transfers | 0 | 0 |
Other increases / decreases for foreign currency exchange rates | (1,000) |  |
Impairment | 0 | 0 |
Transferred to available for sale | 0 |  |
Other increases (decreases) | (191,000) | (41,000) | (131,000)
Amortization | (2,880,000) | (2,653,000) | (2,796,000)
Total increases (decreases) | (1,913,000) | (1,755,000) |
Final balance | 3,378,000 | 5,291,000 | 7,046,000
Computer software [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 25,060,000 | 23,280,000 | 23,251,000
Additions | 5,000 | 939,000 | 160,000
Increases (decreases) for transfers | 0 | 0 |
Other increases / decreases for foreign currency exchange rates | (1,000) |  |
Impairment | 0 | 0 |
Transferred to available for sale | 0 |  |
Other increases (decreases) | 0 | 841,000 | (131,000)
Total increases (decreases) | 4,000 | 1,780,000 |
Final balance | 1,254,000 | 25,060,000 | 23,280,000
Computer software [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | (19,769,000) | (16,234,000) | (13,438,000)
Additions | 0 | 0 | 0
Other increases / decreases for foreign currency exchange rates | 4,000 |  |
Impairment | 0 |  |
Other increases (decreases) | (2,810,000) | (882,000) | 0
Amortization | (2,880,000) | (2,653,000) | (2,796,000)
Total increases (decreases) | (5,686,000) | (3,535,000) |
Final balance | (25,455,000) | (19,769,000) | (16,234,000)
Copyrights, patents and other industrial property rights, service and operating rights [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 189,000 | 460,000 | 464,000
Additions |  | 8,000 | 25,000
Increases (decreases) for transfers |  | 0 |
Impairment |  | 0 |
Other increases (decreases) |  | (241,000) | 9,000
Amortization |  | (38,000) | (38,000)
Total increases (decreases) |  | (271,000) |
Final balance |  | 189,000 | 460,000
Copyrights, patents and other industrial property rights, service and operating rights [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 1,250,000 | 1,483,000 | 1,448,000
Additions | 77,201,000 | 8,000 | 25,000
Increases (decreases) for transfers | 0 | 0 |
Other increases / decreases for foreign currency exchange rates | (4,000) |  |
Impairment | 0 | 0 |
Transferred to available for sale | 0 |  |
Other increases (decreases) | 1,294,000 | (241,000) | 10,000
Total increases (decreases) | 78,491,000 | (233,000) |
Final balance | 184,849,000 | 1,250,000 | 1,483,000
Copyrights, patents and other industrial property rights, service and operating rights [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | (1,061,000) | (1,023,000) | (984,000)
Additions | 0 | 0 | 0
Other increases / decreases for foreign currency exchange rates | 0 |  |
Impairment | (7,000) |  |
Other increases (decreases) | 0 | 0 | (1,000)
Amortization | (35,000) | (38,000) | (38,000)
Total increases (decreases) | (42,000) | (38,000) |
Final balance | (1,103,000) | (1,061,000) | (1,023,000)
Copyrights, patents and other industrial property rights, service and operating rights [member] | Indeifinite Intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 189,000 | 98,596,000 | 96,500,000
Additions | 5,000 |  | 2,100,000
Increases (decreases) for transfers | 0 |  |
Other increases / decreases for foreign currency exchange rates | (1,000) |  |
Impairment | (7,000) |  |
Transferred to available for sale | 0 |  |
Other increases (decreases) | 0 |  | (4,000)
Amortization | (35,000) |  | 0
Total increases (decreases) | (38,000) |  |
Final balance | 151,000 | 189,000 | 98,596,000
Mining Property Water Rights And Rights Of Way [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 106,358,000 |  |
Additions | 77,201,000 |  |
Increases (decreases) for transfers | 0 |  |
Other increases / decreases for foreign currency exchange rates | (4,000) |  |
Impairment | (1,729,000) |  |
Transferred to available for sale | 0 |  |
Other increases (decreases) | 1,294,000 |  |
Amortization | (88,000) |  |
Total increases (decreases) | 76,674,000 |  |
Final balance | 183,032,000 | 106,358,000 |
Mining Property Water Rights And Rights Of Way [Member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 106,358,000 | 106,436,000 |
Increases (decreases) for transfers |  | (205,000) |
Impairment |  | 0 |
Other increases (decreases) |  | 127,000 |
Amortization |  | 0 |
Total increases (decreases) |  | (78,000) |
Final balance |  | 106,358,000 | 106,436,000
Mining Property Water Rights And Rights Of Way [Member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 106,358,000 | 106,436,000 |
Additions |  | 0 |
Increases (decreases) for transfers |  | (205,000) |
Impairment |  | 0 |
Other increases (decreases) |  | 127,000 |
Total increases (decreases) |  | (78,000) |
Final balance |  | 106,358,000 | 106,436,000
Mining Property Water Rights And Rights Of Way [Member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 0 | 0 |
Additions |  | 0 |
Other increases (decreases) |  | 0 |
Amortization |  | 0 |
Total increases (decreases) |  | 0 |
Final balance |  | 0 | 0
Mining Property 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 |  | 98,596,000 | 96,500,000
Additions |  |  | 2,100,000
Increases (decreases) for transfers |  |  |
Other increases / decreases for foreign currency exchange rates |  |  |
Impairment |  |  |
Transferred to available for sale |  |  |
Other increases (decreases) |  |  | (4,000)
Total increases (decreases) |  |  |
Final balance |  |  | 98,596,000
Mining Property 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 |  | 0 | 0
Additions |  |  | 0
Other increases / decreases for foreign currency exchange rates |  |  |
Impairment |  |  |
Other increases (decreases) |  |  | 0
Amortization |  |  | 0
Total increases (decreases) |  |  |
Final balance |  |  | 0
Customer-related intangible assets [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance |  | 2,942,000 |
Increases (decreases) for transfers |  |  |
Final balance |  |  | 2,942,000
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 1,778,000 |  |
Additions | 0 |  |
Increases (decreases) for transfers |  | 0 |
Other increases / decreases for foreign currency exchange rates | 0 |  |
Impairment | (205,000) | 0 |
Transferred to available for sale | 0 |  |
Other increases (decreases) | 0 | (1,164,000) |
Amortization | 0 | 0 |
Total increases (decreases) | (205,000) | (1,164,000) |
Final balance | 1,573,000 | 1,778,000 |
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 1,778,000 | 2,942,000 | 3,651,000
Additions | 0 | 0 | 0
Increases (decreases) for transfers | 0 | 0 |
Other increases / decreases for foreign currency exchange rates | 0 |  |
Impairment | 0 | 0 |
Transferred to available for sale | 0 |  |
Other increases (decreases) | 0 | (1,164,000) | (314,000)
Total increases (decreases) | 1,778,000 | (1,164,000) |
Final balance | 1,778,000 | 1,778,000 | 2,942,000
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member] | Accumulated depreciation and amortisation [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance |  | 0 | 0
Additions | 0 | 0 | 0
Other increases / decreases for foreign currency exchange rates | 0 |  |
Impairment | (205,000) |  |
Other increases (decreases) | 0 | 0 | 0
Amortization | 0 | 0 | 0
Total increases (decreases) | (205,000) | 0 |
Final balance | (205,000) |  | 0
Other Intangible Assets [Member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 0 |  |
Additions | 0 |  |
Other increases / decreases for foreign currency exchange rates | 0 |  |
Impairment | 0 |  |
Other increases (decreases) | 0 |  |
Amortization | 0 |  |
Total increases (decreases) | 0 |  |
Final balance | 0 | 0 |
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 171,000 | 3,337,000 | 3,651,000
Additions | 11,000 | 171,000 | 0
Increases (decreases) for transfers | 0 | 0 |
Other increases / decreases for foreign currency exchange rates | 0 |  |
Impairment | 0 | 0 |
Transferred to available for sale | 0 |  |
Other increases (decreases) | (33,000) | 0 | (314,000)
Amortization | 0 | 0 | 0
Total increases (decreases) | (22,000) | 171,000 |
Final balance | 149,000 | 171,000 | 3,337,000
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 171,000 | 0 |
Additions | 11,000 | 171,000 |
Increases (decreases) for transfers | 0 | 0 |
Other increases / decreases for foreign currency exchange rates | 0 |  |
Impairment | 0 | 0 |
Transferred to available for sale | 0 |  |
Other increases (decreases) | (33,000) | 0 |
Total increases (decreases) | (22,000) | 171,000 |
Final balance | 149,000 | 171,000 | 0
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member] | Accumulated depreciation and amortisation [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | $ 0 | 0 |
Additions |  | 0 |
Other increases (decreases) |  | 0 |
Amortization |  | 0 |
Total increases (decreases) |  | 0 |
Final balance |  | $ 0 | $ 0

X
- 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 2018-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease in intangible assets other than goodwill resulting from classification as held for sale or inclusion in a disposal group classified as held for sale. [Refer: Disposal groups classified as held for sale [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of impairment loss recognised in profit or loss for intangible assets other than goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_iv&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_vii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in intangible assets and goodwill resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_viii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill resulting from transfers. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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