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Basis for preparation, consolidation and accounting policies - Estimated useful lives of right of use assets (Details) - Sociedad Minera Cerro Verde S.A.A. [Member]
 12 Months Ended
Dec. 31, 2020
Land  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Estimated useful life of right of use assets 10 years
Buildings and other constructions | Minimum  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Estimated useful life of right of use assets 1 year
Buildings and other constructions | Maximum  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Estimated useful life of right of use assets 14 years
Machinery and equipment | Minimum  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Estimated useful life of right of use assets 3 years
Machinery and equipment | Maximum  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Estimated useful life of right of use assets 14 years