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Intangible assets and goodwill (Details 2) | 12 Months Ended
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Dec. 31, 2019
Bottom of range [member] | Mining property, water rights and rights of way [Member] |
Disclosure Of Intangible Assets And Goodwill [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | Indefinite
Bottom of range [member] | Mining property [member] |
Disclosure Of Intangible Assets And Goodwill [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 1 year
Bottom of range [member] | Intellectual property rights, patents and other industrial property rights, service [Member] |
Disclosure Of Intangible Assets And Goodwill [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 1 year
Bottom of range [member] | Commercial trademarks [Member] |
Disclosure Of Intangible Assets And Goodwill [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 1 year
Bottom of range [member] | IT programs [Member] |
Disclosure Of Intangible Assets And Goodwill [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 2 years
Top of range [member] | Mining property, water rights and rights of way [Member] |
Disclosure Of Intangible Assets And Goodwill [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | Indefinite
Top of range [member] | Mining property [member] |
Disclosure Of Intangible Assets And Goodwill [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 11 years
Top of range [member] | Intellectual property rights, patents and other industrial property rights, service [Member] |
Disclosure Of Intangible Assets And Goodwill [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 16 years
Top of range [member] | Commercial trademarks [Member] |
Disclosure Of Intangible Assets And Goodwill [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 5 years
Top of range [member] | IT programs [Member] |
Disclosure Of Intangible Assets And Goodwill [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 6 years

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- Definition Description of useful life used for 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 2019-01-01 -Paragraph 118 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The useful life, measured as period of time, used for 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 2019-01-01 -Paragraph 118 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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