XML 50 R73.htm IDEA: XBRL DOCUMENT v3.20.1
Significant accounting policies (Details 1)
 12 Months Ended
Dec. 31, 2019
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 5 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 2 years
Bottom of range [member] | Network and communication equipment  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 2 years
Bottom of range [member] | IT equipment [Member]  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 2 years
Bottom of range [member] | Machinery, plant and equipment  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 1 year
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 1 year
Top of range [member] | Mining assets [member]  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 10 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 10 years
Top of range [member] | Buildings [member]  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 15 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 2 years
Top of range [member] | Network and communication equipment  
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 8 years
Top of range [member] | Machinery, plant and equipment  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 15 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 10 years
Weighted Average [Member] | Mining assets [member]  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 5 years
Weighted Average [Member] | Energy generating assets [Member]  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 6 years
Weighted Average [Member] | Buildings [member]  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 8 years
Weighted Average [Member] | Supplies and accessories [Member]  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 3 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 2 years
Weighted Average [Member] | Network and communication equipment  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 5 years
Weighted Average [Member] | IT equipment [Member]  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 5 years
Weighted Average [Member] | Machinery, plant and equipment  
Significant accounting policies [Line Items]  
Useful life measured as period of time, property, plant and equipment 7 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 5 years