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Significant accounting policies (Details 1)
 12 Months Ended
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