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Mining concessions, development costs, property, plant and equipment, net (Details 1)
Dec. 31, 2017
$ / Ounce-oz
$ / MetricTon-Mg
Gold [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity price estimates | $ / Ounce-oz 1,221
Not later than one year [member] | Gold [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity price estimates | $ / Ounce-oz 1,300
Not later than one year [member] | Silver [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity price estimates | $ / Ounce-oz 17
Not later than one year [member] | Copper [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity price estimates 6,000
Not later than one year [member] | Lead [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity price estimates 2,250
Not later than one year [member] | Zinc [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity price estimates 2,750
Later than one year and not later than two years [member] | Gold [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity price estimates | $ / Ounce-oz 1,300
Later than one year and not later than two years [member] | Silver [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity price estimates | $ / Ounce-oz 18
Later than one year and not later than two years [member] | Copper [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity price estimates 6,000
Later than one year and not later than two years [member] | Lead [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity price estimates 2,250
Later than one year and not later than two years [member] | Zinc [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity price estimates 2,600