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Intangible assets and goodwill (Details 4) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | $ 224,216,000 | $ 151,759,000 |
Additions | 2,856,000 | 78,376,000 |
Other increases / decreases for foreign currency | (6,000) | (6,000) |
Decreases through sale | (1,314,000) |  |
Impairment | (1,053,000) | (4,990,000) | $ 1,164,000
Other increases (decreases) | 2,479,000 | 2,285,000 |
Amortization | (4,094,000) | (3,208,000) |
Total increases (decreases) | (1,132,000) | 72,457,000 |
Final balance | 223,084,000 | 224,216,000 | 151,759,000
Gross carrying amount [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 256,049,000 | 172,589,000 |
Additions | 2,856,000 | 78,376,000 |
Other increases / decreases for foreign currency | (9,000) | (10,000) |
Decreases through sale | (1,314,000) |  |
Other increases (decreases) | 2,735,000 | 5,094,000 |
Total increases (decreases) | 4,268,000 | 83,460,000 |
Final balance | 260,317,000 | 256,049,000 | 172,589,000
Accumulated depreciation and amortisation [member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | (31,833,000) | (20,830,000) |
Other increases / decreases for foreign currency | 3,000 | 4,000 |
Impairment | (1,053,000) | (4,990,000) |
Other increases (decreases) | (256,000) | (2,809,000) |
Amortization | (4,094,000) | (3,208,000) |
Total increases (decreases) | (5,400,000) | (11,003,000) |
Final balance | (37,233,000) | (31,833,000) | (20,830,000)
Indeifinite Intangible assets [Member] | Goodwill [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 34,866,000 | 37,972,000 |
Additions | 0 | 0 |
Other increases / decreases for foreign currency | 0 | 0 |
Impairment | (140,000) | (3,254,000) |
Other increases (decreases) | 0 | 148,000 |
Amortization | 0 | 0 |
Total increases (decreases) | (140,000) | (3,106,000) |
Final balance | 38,120,000 | 34,866,000 | 37,972,000
Indeifinite Intangible assets [Member] | Gross carrying amount [member] | Goodwill [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 38,120,000 | 37,972,000 |
Additions |  | 0 |
Other increases / decreases for foreign currency |  | 0 |
Other increases (decreases) |  | 148,000 |
Total increases (decreases) |  | 148,000 |
Final balance |  | 38,120,000 | 37,972,000
Indeifinite Intangible assets [Member] | Accumulated depreciation and amortisation [member] | Goodwill [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | (3,254,000) | 0 |
Other increases / decreases for foreign currency | 0 | 0 |
Impairment | (140,000) | (3,254,000) |
Other increases (decreases) | 0 | 0 |
Amortization | 0 | 0 |
Total increases (decreases) | (140,000) | (3,254,000) |
Final balance | (3,394,000) | (3,254,000) | 0
IT programs [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 4,568,000 | 5,291,000 |
Additions | 2,606,000 | 1,159,000 |
Other increases / decreases for foreign currency | (4,000) | (1,000) |
Impairment | 0 | 0 |
Other increases (decreases) | 2,479,000 | 999,000 |
Amortization | (3,638,000) | (2,880,000) |
Total increases (decreases) | 1,443,000 | (723,000) |
Final balance | 6,011,000 | 4,568,000 | 5,291,000
IT programs [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 29,137,000 | 25,060,000 |
Additions | 2,606,000 | 1,159,000 |
Other increases / decreases for foreign currency | (7,000) | (5,000) |
Other increases (decreases) | 2,735,000 | 2,923,000 |
Total increases (decreases) | 5,334,000 | 4,077,000 |
Final balance | 34,471,000 | 29,137,000 | 25,060,000
IT programs [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | (24,569,000) | (19,769,000) |
Other increases / decreases for foreign currency | 3,000 | 4,000 |
Impairment | 0 | 0 |
Other increases (decreases) | (256,000) | (1,924,000) |
Amortization | (3,638,000) | (2,880,000) |
Total increases (decreases) | (3,891,000) | (4,800,000) |
Final balance | (28,460,000) | (24,569,000) | (19,769,000)
Intellectual property rights, patents and other industrial property rights, service, Finite [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 151,000 | 189,000 |
Additions | 5,000 | 5,000 |
Other increases / decreases for foreign currency | 0 | (1,000) |
Impairment | 0 | (7,000) |
Other increases (decreases) | 0 | 0 |
Amortization | (35,000) | (35,000) |
Total increases (decreases) | (30,000) | (38,000) |
Final balance | 121,000 | 151,000 | 189,000
Intellectual property rights, patents and other industrial property rights, service, Finite [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 1,254,000 | 1,250,000 |
Additions | 5,000 | 5,000 |
Other increases / decreases for foreign currency | 0 | (1,000) |
Other increases (decreases) | 0 | 0 |
Total increases (decreases) | 5,000 | 4,000 |
Final balance | 1,259,000 | 1,254,000 | 1,250,000
Intellectual property rights, patents and other industrial property rights, service, Finite [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | (1,103,000) | (1,061,000) |
Other increases / decreases for foreign currency | 0 | 0 |
Impairment | 0 | (7,000) |
Other increases (decreases) | 0 | 0 |
Amortization | (35,000) | (35,000) |
Total increases (decreases) | (35,000) | (42,000) |
Final balance | (1,138,000) | (1,103,000) | (1,061,000)
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 | 183,349,000 |  |
Additions | 227,000 |  |
Other increases / decreases for foreign currency | (2,000) |  |
Decreases through sale | (1,314,000) |  |
Other increases (decreases) | 0 |  |
Total increases (decreases) | (1,089,000) |  |
Final balance | 182,260,000 | 183,349,000 |
Mining Property Water Rights And Rights Of Way [Member] | Indeifinite Intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 181,620,000 | 104,858,000 |
Additions | 227,000 | 77,201,000 |
Other increases / decreases for foreign currency | (2,000) | (4,000) |
Decreases through sale | (1,314,000) |  |
Impairment | (913,000) | (1,729,000) |
Other increases (decreases) | 0 | 1,294,000 |
Amortization | 0 | 0 |
Total increases (decreases) | (2,002,000) | 76,762,000 |
Final balance | 179,618,000 | 181,620,000 | 104,858,000
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 | 183,349,000 | 104,858,000 |
Additions |  | 77,201,000 |
Other increases / decreases for foreign currency |  | (4,000) |
Other increases (decreases) |  | 1,294,000 |
Total increases (decreases) |  | 78,491,000 |
Final balance |  | 183,349,000 | 104,858,000
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 | (1,729,000) | 0 |
Other increases / decreases for foreign currency | 0 | 0 |
Impairment | (913,000) | (1,729,000) |
Other increases (decreases) | 0 | 0 |
Amortization | 0 | 0 |
Total increases (decreases) | (913,000) | (1,729,000) |
Final balance | (2,642,000) | (1,729,000) | 0
Mining property [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 1,412,000 | 1,500,000 |
Additions | 0 | 0 |
Other increases / decreases for foreign currency | 0 | 0 |
Impairment | 0 | 0 |
Other increases (decreases) | 0 | 0 |
Amortization | (118,000) | (88,000) |
Total increases (decreases) | (118,000) | (88,000) |
Final balance | 1,294,000 | 1,412,000 | 1,500,000
Mining property [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 1,500,000 | 1,500,000 |
Additions | 0 | 0 |
Other increases / decreases for foreign currency | 0 | 0 |
Other increases (decreases) | 0 | 0 |
Total increases (decreases) | 0 | 0 |
Final balance | 1,500,000 | 1,500,000 | 1,500,000
Mining property [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | (88,000) | 0 |
Other increases / decreases for foreign currency | 0 | 0 |
Impairment | 0 | 0 |
Other increases (decreases) | 0 | 0 |
Amortization | (118,000) | (88,000) |
Total increases (decreases) | (118,000) | (88,000) |
Final balance | (206,000) | (88,000) | 0
Customer-related intangible assets [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 1,573,000 | 1,778,000 |
Additions | 0 | 0 |
Other increases / decreases for foreign currency | 0 | 0 |
Impairment | 0 | 0 |
Other increases (decreases) | 0 | 0 |
Amortization | (300,000) | (205,000) |
Total increases (decreases) | (300,000) | (205,000) |
Final balance | 1,273,000 | 1,573,000 | 1,778,000
Customer-related intangible assets [member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 1,778,000 | 1,778,000 |
Additions | 0 | 0 |
Other increases / decreases for foreign currency | 0 | 0 |
Other increases (decreases) | 0 | 0 |
Total increases (decreases) | 0 | 0 |
Final balance | 1,778,000 | 1,778,000 | 1,778,000
Customer-related intangible assets [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | (205,000) | 0 |
Other increases / decreases for foreign currency | 0 | 0 |
Impairment | 0 | 0 |
Other increases (decreases) | 0 | 0 |
Amortization | (300,000) | (205,000) |
Total increases (decreases) | (300,000) | (205,000) |
Final balance | (505,000) | (205,000) | 0
Other Intangible Assets [Member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 26,000 | 171,000 |
Additions | 18,000 | 11,000 |
Other increases / decreases for foreign currency | 0 | 0 |
Impairment | 0 | 0 |
Other increases (decreases) | 0 | (156,000) |
Amortization | (3,000) | 0 |
Total increases (decreases) | 15,000 | (145,000) |
Final balance | 41,000 | 26,000 | 171,000
Other Intangible Assets [Member] | Gross carrying amount [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | 911,000 | 171,000 |
Additions | 18,000 | 11,000 |
Other increases / decreases for foreign currency | 0 | 0 |
Other increases (decreases) | 0 | 729,000 |
Total increases (decreases) | 18,000 | 740,000 |
Final balance | 929,000 | 911,000 | 171,000
Other Intangible Assets [Member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Opening balance | (885,000) | 0 |
Other increases / decreases for foreign currency | 0 | 0 |
Impairment | 0 | 0 |
Other increases (decreases) | 0 | (885,000) |
Amortization | (3,000) | 0 |
Total increases (decreases) | (3,000) | (885,000) |
Final balance | $ (888,000) | $ (885,000) | $ 0

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