XML 95 R72.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Significant accounting policies (Details 1) | 12 Months Ended
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Dec. 31, 2017
Bottom of range [member] | Mining assets [member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 3
Bottom of range [member] | Energy generating assets [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 3
Bottom of range [member] | Buildings [member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 3
Bottom of range [member] | Supplies and accessories [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 2
Bottom of range [member] | Office Equipment [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 3
Bottom of range [member] | Transport equipment [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 3
Bottom of range [member] | Network and communication equipment |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 2
Bottom of range [member] | IT equipment [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 2
Bottom of range [member] | Machinery, plant and equipment |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 2
Bottom of range [member] | Other property, plant and equipment [member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 1
Top of range [member] | Mining assets [member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 10
Top of range [member] | Energy generating assets [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 16
Top of range [member] | Buildings [member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 30
Top of range [member] | Supplies and accessories [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 15
Top of range [member] | Office Equipment [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 20
Top of range [member] | Transport equipment [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 20
Top of range [member] | Network and communication equipment |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 15
Top of range [member] | IT equipment [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 15
Top of range [member] | Machinery, plant and equipment |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 20
Top of range [member] | Other property, plant and equipment [member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 26
Weighted Average [Member] | Mining assets [member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 7
Weighted Average [Member] | Energy generating assets [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 7
Weighted Average [Member] | Buildings [member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 10
Weighted Average [Member] | Supplies and accessories [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 5
Weighted Average [Member] | Office Equipment [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 6
Weighted Average [Member] | Transport equipment [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 10
Weighted Average [Member] | Network and communication equipment |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 5
Weighted Average [Member] | IT equipment [Member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 3
Weighted Average [Member] | Machinery, plant and equipment |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 9
Weighted Average [Member] | Other property, plant and equipment [member] |
Significant accounting policies [Line Items] |
Useful lives or depreciation rates, property, plant and equipment | 7

X
- Definition The useful lives or depreciation rates 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 2017-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_c&doctype=Standard -URIDate 2017-03-09 + Details
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- References No definition available. + Details
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