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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, 2020
$ / t
$ / oz
Less than 1 year | Gold per ounce [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates | $ / oz 1,800
Less than 1 year | Silver [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates | $ / oz 23.00
Less than 1 year | Copper [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates | $ / t 7,250
Less than 1 year | Lead [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates | $ / t 1,850
Between 1 to 2 years | Gold per ounce [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates | $ / oz 1,747
Between 1 to 2 years | Silver [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates | $ / oz 21.20
Between 1 to 2 years | Copper [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates | $ / t 7,083
Between 1 to 2 years | Lead [Member]  
Mining concessions, development costs, property, plant and equipment, net  
Commodity price estimates | $ / t 2,056