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Mining concessions, development costs, right-of-use assets, property, plant and equipment, net - Estimates prices for the current and long-term periods (Details)
Dec. 31, 2019
$ / t
$ / oz
Less than one year [member] | Gold per ounce [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates | $ / oz 1,500
Less than one year [member] | Silver [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates | $ / oz 17.00
Less than one year [member] | Copper [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates 6,000
Less than one year [member] | Lead [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates 1,950
Less than one year [member] | Zinc [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates 2,250
Between 1 and 2 years [member] | Gold per ounce [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates | $ / oz 1,500
Between 1 and 2 years [member] | Silver [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates | $ / oz 18.40
Between 1 and 2 years [member] | Copper [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates 6,600
Between 1 and 2 years [member] | Lead [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates 2,100
Between 1 and 2 years [member] | Zinc [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates 2,300