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Mining concessions, development costs, right-of-use asset, property, plant and equipment, net - Carrying amounts of right-of-use assets recognized (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Opening Balance $ 6,185  
Addition 6,200 $ 3,700
Ending Balance 7,178 6,185
Sociedad Minera Cerro Verde S.A.A. [Member]    
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Opening Balance 84,856 95,728
Ending Balance 76,862 84,856
Sociedad Minera Cerro Verde S.A.A. [Member] | Gross carrying amount [Member]    
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Opening Balance 95,441 95,728
Addition 3,328 1,342
Adjustments   (700)
Disposals and or/sales (2,318) (929)
Ending Balance 96,451 95,441
Sociedad Minera Cerro Verde S.A.A. [Member] | Gross carrying amount [Member] | Land    
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Opening Balance 9,851 11,008
Adjustments   (700)
Disposals and or/sales   (457)
Ending Balance 9,851 9,851
Sociedad Minera Cerro Verde S.A.A. [Member] | Gross carrying amount [Member] | Buildings and other constructions    
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Opening Balance 55,936 55,114
Addition 2,880 1,192
Disposals and or/sales (2,222) (370)
Ending Balance 56,594 55,936
Sociedad Minera Cerro Verde S.A.A. [Member] | Gross carrying amount [Member] | Machinery and equipment    
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Opening Balance 29,654 29,606
Addition 448 150
Disposals and or/sales (96) (102)
Ending Balance 30,006 29,654
Sociedad Minera Cerro Verde S.A.A. [Member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Opening Balance (10,585) 0
Addition 11,320 11,488
Disposals and or/sales (2,316) (903)
Ending Balance (19,589) (10,585)
Sociedad Minera Cerro Verde S.A.A. [Member] | Accumulated depreciation, amortisation and impairment [member] | Land    
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Opening Balance (1,255) 0
Addition 1,642 1,712
Disposals and or/sales   (457)
Ending Balance (2,897) (1,255)
Sociedad Minera Cerro Verde S.A.A. [Member] | Accumulated depreciation, amortisation and impairment [member] | Buildings and other constructions    
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Opening Balance (6,269) 0
Addition 6,526 6,613
Disposals and or/sales (2,220) (344)
Ending Balance (10,575) (6,269)
Sociedad Minera Cerro Verde S.A.A. [Member] | Accumulated depreciation, amortisation and impairment [member] | Machinery and equipment    
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]    
Opening Balance (3,061) 0
Addition 3,152 3,163
Disposals and or/sales (96) (102)
Ending Balance $ (6,117) $ (3,061)