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Basis for preparation, consolidation and accounting policies - Reclassifications of comparative information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Sales $ 637,619 $ 821,930 $ 1,106,329
Cost applicable to sales (393,888) (512,874) (613,381)
Trade and other payables 179,956 166,244  
Income tax payable 3,162 5,650  
Royalties expenses 11,749 12,832 21,388
Accounts payable 179,956 166,860  
Current liabilities      
Trade and other payables 179,956 166,244  
Provisions 68,000 72,771  
Adjustments to reconcile profit after income tax to net cash flows from operating activities:      
Net cash and cash equivalents provided by operating activities 122,885 47,065 346,260
Minera Yanacocha SRL and subsidiary [Member]      
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Sales 592,394 734,526 658,653
Cost applicable to sales (666,456) (692,721) (619,424)
Trade and other payables 68,645 72,806  
Income tax payable 42,029 23,153  
Royalties expenses   49,000 3,600
Provision related to benefits to employees 17,311 12,793  
Current liabilities      
Trade and other payables 68,645 72,806  
Provisions 101,786 45,317  
Other accruals and liabilities   49,301  
Non-current liabilities      
Provisions 1,660,603 1,587,551  
Other accruals and liabilities 40 305  
Adjustments to reconcile profit after income tax to net cash flows from operating activities:      
Provisions   10,051 (2,617)
Trade and other payables   (8,231) 2,028
Other accruals and liabilities   21,282 (197)
Value added tax credit and other taxes   (16,491) 7,616
Current income tax expense   64,928 29,297
Net cash and cash equivalents provided by operating activities   (34,419) (78,519)
Minera Yanacocha SRL and subsidiary [Member] | Previously stated      
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Trade and other payables   76,484  
Current liabilities      
Trade and other payables   76,484  
Provisions   90,940  
Non-current liabilities      
Provisions   1,587,856  
Adjustments to reconcile profit after income tax to net cash flows from operating activities:      
Provisions   30,082 (2,494)
Trade and other payables   (6,980) 1,708
Value added tax credit and other taxes   (3,003) 13,856
Income tax collected(paid)   19,239 14,160
Income tax payable   32,201 8,897
Net cash and cash equivalents provided by operating activities   (34,419) (78,519)
Minera Yanacocha SRL and subsidiary [Member] | Reclassifications      
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Trade and other payables   (3,678)  
Other capital contributions 10,100    
Current liabilities      
Trade and other payables   (3,678)  
Provisions   (45,623)  
Other accruals and liabilities   49,301  
Non-current liabilities      
Provisions   (305)  
Other accruals and liabilities   305  
Adjustments to reconcile profit after income tax to net cash flows from operating activities:      
Provisions   (20,031) (123)
Trade and other payables   (1,251) 320
Other accruals and liabilities   21,282 (197)
Value added tax credit and other taxes   (13,488) (6,240)
Income tax collected(paid)   (19,239) (14,160)
Income tax payable   (32,201) (8,897)
Current income tax expense   64,928 29,297
Sociedad Minera Cerro Verde S.A.A. [Member]      
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Sales 2,538,593 2,896,894 3,061,930
Income tax payable 34,716    
Royalties expenses 2,000 2,923 2,743
Accounts payable - Related entities 3,446 4,014  
Other capital contributions 11,500 10,100 $ 8,900
Accounts payable 411,857 $ 479,104  
Sociedad Minera Cerro Verde S.A.A. [Member] | Reclassifications      
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Accounts payable - Related entities (10,100)    
Amount of reclassifications from opening balance of accounts payable - related parties 8,900    
Amount of reclassifications from accounts payable - related parties during the period 1,200    
Provisions, short term (27,900)    
Accounts payable 27,900    
Provision related to benefits to employees (17,300)    
Other accounts payable 17,300    
Sociedad Minera Cerro Verde S.A.A. [Member] | Reclassifications | Sales of goods      
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Royalties expenses (6,800)    
Sociedad Minera Cerro Verde S.A.A. [Member] | Reclassifications | Cost of sales      
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Royalties expenses $ 6,800