XML 94 R68.htm IDEA: XBRL DOCUMENT
v3.20.4

Significant accounting policies (Details 1) | 12 Months Ended
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Dec. 31, 2020
Bottom of range [Member] | Mining assets [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 3 years
Bottom of range [Member] | Energy generating assets [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 3 years
Bottom of range [Member] | Buildings [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 3 years
Bottom of range [Member] | Supplies and accessories [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 2 years
Bottom of range [Member] | Office Equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 5 years
Bottom of range [Member] | Transport equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 5 years
Bottom of range [Member] | Network and communication equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 4 years
Bottom of range [Member] | IT equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 5 years
Bottom of range [Member] | Machinery, plant and equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 5 years
Bottom of range [Member] | Other property, plant and equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 3 years
Top of range [Member] | Mining assets [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 7 years
Top of range [Member] | Energy generating assets [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 16 years
Top of range [Member] | Buildings [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 25 years
Top of range [Member] | Supplies and accessories [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 10 years
Top of range [Member] | Office Equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 5 years
Top of range [Member] | Transport equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 8 years
Top of range [Member] | Network and communication equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 10 years
Top of range [Member] | IT equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 11 years
Top of range [Member] | Machinery, plant and equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 25 years
Top of range [Member] | Other property, plant and equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 15 years
Weighted Average [Member] | Mining assets [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 6 years
Weighted Average [Member] | Energy generating assets [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 9 years
Weighted Average [Member] | Buildings [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 13 years
Weighted Average [Member] | Supplies and accessories [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 7 years
Weighted Average [Member] | Office Equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 5 years
Weighted Average [Member] | Transport equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 6 years
Weighted Average [Member] | Network and communication equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 8 years
Weighted Average [Member] | IT equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 7 years
Weighted Average [Member] | Machinery, plant and equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 13 years
Weighted Average [Member] | Other property, plant and equipment [Member] |
Significant accounting policies [Line Items] |
Useful life measured as period of time, property, plant and equipment | 10 years

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- Definition The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_c&doctype=Standard -URIDate 2020-01-01 + Details
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