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Mining concessions, development costs, right-of-use asset, property, plant and equipment, net - Estimate future revenues (Details) - Minera Yanacocha SRL and subsidiary [Member]
 12 Months Ended
Dec. 31, 2020
$ / oz
$ / £
Gold per ounce [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity Price Estimate , Current | $ / oz 1,876
Commodity Price Estimate , Long Term | $ / oz 1,500
Copper [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Commodity Price Estimate , Current | $ / £ 3.1
Commodity Price Estimate , Long Term | $ / £ 3.0