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Mining concessions, development costs, property, plant and equipment, net (Details 1)
Dec. 31, 2018
$ / Ounce-oz
Dec. 31, 2018
$ / MetricTon-Mg
Dec. 31, 2017
$ / Ounce-oz
Gold (per ounce) [Member]      
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Commodity price estimates 1,300 1,221 1,221
Not later than one year [member] | Gold (per ounce) [Member]      
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Commodity price estimates 1,250 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 16    
Not later than one year [member] | Copper [Member]      
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Commodity price estimates   6,750  
Not later than one year [member] | Lead [Member]      
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Commodity price estimates   2,100  
Later than one year and not later than two years [member] | Gold (per ounce) [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 17    
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   7,000  
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   2,100