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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, 2021
$ / oz
Dec. 31, 2020
$ / £
$ / oz
Gold per ounce [Member]    
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Commodity Price Estimate , Long Term 1,800 1,500
Silver [Member]    
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Commodity Price Estimate , Long Term 23 16
Copper [Member]    
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Commodity Price Estimate , Long Term 3.05 3.00