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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)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Addition $ 3,700
Ending Balance 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 95,728
Ending Balance 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 95,728
Addition 1,342
Adjustments (700)
Agreements modification (929)
Ending Balance 95,441
Sociedad Minera Cerro Verde S.A.A. [Member] | Gross carrying amount [Member] | Land [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Opening Balance 11,008
Adjustments (700)
Agreements modification (457)
Ending Balance 9,851
Sociedad Minera Cerro Verde S.A.A. [Member] | Gross carrying amount [Member] | Buildings  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Opening Balance 55,114
Addition 1,192
Agreements modification (370)
Ending Balance 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 29,606
Addition 150
Agreements modification (102)
Ending Balance 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]  
Addition 11,488
Agreements modification (903)
Ending Balance (10,585)
Sociedad Minera Cerro Verde S.A.A. [Member] | Accumulated depreciation, amortisation and impairment [member] | Land [Member]  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Addition 1,712
Agreements modification (457)
Ending Balance (1,255)
Sociedad Minera Cerro Verde S.A.A. [Member] | Accumulated depreciation, amortisation and impairment [member] | Buildings  
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]  
Addition 6,613
Agreements modification (344)
Ending Balance (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]  
Addition 3,163
Agreements modification (102)
Ending Balance $ (3,061)