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Mining concessions, development costs, right-of-use asset, property, plant and equipment, net - Net cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, plant and equipments,net [Line Items]      
Opening balance $ 1,754,372 $ 1,847,615  
Final balances 1,650,361 1,754,372 $ 1,847,615
Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 1,038,294 840,454  
Final balances 1,039,579 1,038,294 840,454
Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 5,690,851 5,602,902  
Final balances 5,495,976 5,690,851 5,602,902
Gross carrying amount [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 3,781,326 3,727,403  
Additions 109,325 133,070  
Sales and disposals (14,270) (48,153)  
Sales 104,403 45,772  
Final balances 3,771,978 3,781,326 3,727,403
Gross carrying amount [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 4,567,187 4,309,213  
Additions 143,489 344,415  
Sales and disposals (25,067) (85,069)  
Transfer/Other changes (382) (1,372)  
Final balances 4,685,227 4,567,187 4,309,213
Gross carrying amount [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 8,753,310 8,166,652  
Additions 294,846 529,708  
Adjustments and reclassifications (6,255) (1,892)  
Sales and disposals (15,146) (36,886)  
Transfer/Other changes 0 0  
Final balances 9,026,755 8,753,310 8,166,652
Gross carrying amount [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     95,728
Gross carrying amount [Member] | Land      
Property, plant and equipments,net [Line Items]      
Opening balance 17,517 21,761  
Additions 133 630  
Sales   135  
Final balances 17,650 17,517 21,761
Gross carrying amount [Member] | Land | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 17,053 9,459  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 269 7,594  
Final balances 17,322 17,053 9,459
Gross carrying amount [Member] | Land | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 24,905 24,663  
Additions 0 0  
Adjustments and reclassifications 0 0  
Sales and disposals 0 (80)  
Transfer/Other changes 0 322  
Final balances 24,905 24,905 24,663
Gross carrying amount [Member] | Land | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Gross carrying amount [Member] | Land improvements [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 28,982 36,454  
Additions 0 0  
Sales and disposals 0 (7,472)  
Transfer/Other changes 0 0  
Final balances 28,982 28,982 36,454
Gross carrying amount [Member] | Buildings and constructions [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 271,554 298,328  
Additions 0 0  
Sales and disposals 0 (26,556)  
Transfer/Other changes 4,510 (218)  
Final balances 276,064 271,554 298,328
Gross carrying amount [Member] | Buildings and constructions [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 2,548,124 2,449,577  
Additions 0 0  
Adjustments and reclassifications (1) 544  
Sales and disposals (14) (4,769)  
Transfer/Other changes 40,895 102,772  
Final balances 2,589,004 2,548,124 2,449,577
Gross carrying amount [Member] | Buildings and constructions [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Gross carrying amount [Member] | Machinery and equipment      
Property, plant and equipments,net [Line Items]      
Opening balance 912,704 958,466  
Additions 4 12  
Sales and disposals (419) (30,235)  
Sales (42,319) 38,322  
Final balances 883,192 912,704 958,466
Gross carrying amount [Member] | Machinery and equipment | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 216,872 244,560  
Additions 0 0  
Sales and disposals (20,844) (46,286)  
Transfer/Other changes 14,187 18,598  
Final balances 210,215 216,872 244,560
Gross carrying amount [Member] | Machinery and equipment | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 4,854,613 4,694,050  
Additions 0 0  
Adjustments and reclassifications 1 (544)  
Sales and disposals (12,814) (30,482)  
Transfer/Other changes 143,949 191,589  
Final balances 4,985,749 4,854,613 4,694,050
Gross carrying amount [Member] | Machinery and equipment | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Gross carrying amount [Member] | Leach pads [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 1,817,226 1,723,270  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 12,253 93,956  
Final balances 1,829,479 1,817,226 1,723,270
Gross carrying amount [Member] | Transportation units [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 8,892 10,885  
Additions   33  
Sales and disposals   (540)  
Sales (577) 1,856  
Final balances 8,409 8,892 10,885
Gross carrying amount [Member] | Transportation units [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 9,402 9,921  
Additions 0 0  
Sales and disposals (98) (1,043)  
Transfer/Other changes 951 524  
Final balances 10,255 9,402 9,921
Gross carrying amount [Member] | Transportation units [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 26,365 23,251  
Additions 0 0  
Adjustments and reclassifications 0 0  
Sales and disposals 0 (32)  
Transfer/Other changes 3,733 3,146  
Final balances 30,098 26,365 23,251
Gross carrying amount [Member] | Transportation units [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Gross carrying amount [Member] | Fixtures and fittings [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 12,010 13,306  
Additions 3 2  
Sales and disposals (74) (1,310)  
Sales (408) 1  
Final balances 11,737 12,010 13,306
Gross carrying amount [Member] | Fixtures and fittings [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 2,556 2,556  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances 2,556 2,556 2,556
Gross carrying amount [Member] | Fixtures and fittings [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 949 949  
Additions 0 0  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances 949 949 949
Gross carrying amount [Member] | Fixtures and fittings [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Gross carrying amount [Member] | Other property, plant and equipment [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 59,262 58,924  
Additions 0 0  
Sales and disposals 0 (3,712)  
Transfer/Other changes 2,232 4,050  
Final balances 61,494 59,262 58,924
Gross carrying amount [Member] | Other property, plant and equipment [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 25,100 25,491  
Additions 0 0  
Adjustments and reclassifications 0 0  
Sales and disposals 0 (594)  
Transfer/Other changes 5,865 203  
Final balances 30,965 25,100 25,491
Gross carrying amount [Member] | Other property, plant and equipment [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Gross carrying amount [Member] | Work in Progress [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 50,365 56,662  
Additions 27,322 44,319  
Sales and disposals (325) (1,168)  
Sales (30) 78  
Final balances 34,934 50,365 56,662
Gross carrying amount [Member] | Work in Progress [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 436,699 444,688  
Additions 143,489 184,403  
Sales and disposals 0 0  
Transfer/Other changes (69,829) (192,392)  
Final balances 510,359 436,699 444,688
Gross carrying amount [Member] | Work in Progress [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 158,068 185,928  
Additions 161,059 271,364  
Adjustments and reclassifications (6,255) (1,192)  
Sales and disposals 0 0  
Transfer/Other changes (194,442) (298,032)  
Final balances 118,430 158,068 185,928
Gross carrying amount [Member] | Work in Progress [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Gross carrying amount [Member] | Mining property [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 37,521 37,521  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances 37,521 37,521 37,521
Gross carrying amount [Member] | Right-of-use assets [member]      
Property, plant and equipments,net [Line Items]      
Opening balance 11,352    
Additions 6,221 3,721  
Sales and disposals (1,314) (10,897)  
Final balances 16,259 11,352  
Gross carrying amount [Member] | Right-of-use assets [member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 1,045    
Additions 0 1,045  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances 1,045 1,045  
Gross carrying amount [Member] | Right-of-use assets [member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 95,441    
Additions 3,328 1,342  
Adjustments and reclassifications   (700)  
Sales and disposals (2,318) (929)  
Final balances 96,451 95,441  
Gross carrying amount [Member] | Right-of-use assets [member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     95,728
Gross carrying amount [Member] | Asset retirement and mine closure cost asset [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 693,365 534,398  
Additions 0 158,967  
Sales and disposals (4,125) 0  
Transfer/Other changes 0 0  
Final balances 689,240 693,365 534,398
Gross carrying amount [Member] | Stripping activity asset [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 154,090 141,726  
Additions 10,752 11,545  
Sales and disposals (11,633)    
Final balances 152,597 154,090 141,726
Gross carrying amount [Member] | Stripping activity asset [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 151,494 148,487  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 35,045 3,007  
Final balances 186,539 151,494 148,487
Gross carrying amount [Member] | Stripping activity asset [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 852,747 655,709  
Additions 92,890 197,038  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances 945,637 852,747 655,709
Gross carrying amount [Member] | Stripping activity asset [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Gross carrying amount [Member] | Mine developments [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 824,156 760,647  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 63,509  
Final balances 824,156 824,156 760,647
Gross carrying amount [Member] | Asset retirement costs [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 166,998 107,034  
Additions 37,569 59,964  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances 204,567 166,998 107,034
Gross carrying amount [Member] | Asset retirement costs [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Accumulated amortisation [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (3,528,893) (3,468,759)  
Additions (137,238) (141,815)  
Sales and disposals 20,483 81,681  
Transfer/Other changes 0 0  
Final balances (3,645,648) (3,528,893) (3,468,759)
Accumulated amortisation [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (3,062,459) (2,563,750)  
Additions (483,285) (534,047)  
Adjustments and reclassifications 0 0  
Sales and disposals 14,965 35,338  
Transfer/Other changes 0 0  
Final balances (3,530,779) (3,062,459) (2,563,750)
Accumulated amortisation [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Accumulated amortisation [Member] | Land improvements [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (28,315) (35,583)  
Additions (80) (101)  
Sales and disposals 0 7,369  
Transfer/Other changes 0 0  
Final balances (28,395) (28,315) (35,583)
Accumulated amortisation [Member] | Buildings and constructions [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (226,129) (247,979)  
Additions (6,981) (5,702)  
Sales and disposals 0 26,579  
Transfer/Other changes 0 (973)  
Final balances (233,110) (226,129) (247,979)
Accumulated amortisation [Member] | Buildings and constructions [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (393,910) (321,920)  
Additions (62,317) (76,199)  
Adjustments and reclassifications 0 513  
Sales and disposals 14 4,722  
Transfer/Other changes 0 0  
Final balances (456,213) (393,910) (321,920)
Accumulated amortisation [Member] | Buildings and constructions [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Accumulated amortisation [Member] | Machinery and equipment | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (184,030) (204,255)  
Additions (18,029) (21,780)  
Sales and disposals 20,385 42,978  
Transfer/Other changes 0 973  
Final balances (181,674) (184,030) (204,255)
Accumulated amortisation [Member] | Machinery and equipment | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (2,040,819)    
Additions (277,384) (284,097) (1,786,326)
Adjustments and reclassifications 0 (513)  
Sales and disposals 12,635 29,091  
Transfer/Other changes 0 0  
Final balances (2,305,568) (2,040,819)  
Accumulated amortisation [Member] | Machinery and equipment | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Accumulated amortisation [Member] | Leach pads [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (1,694,288) (1,656,002)  
Additions (40,197) (38,286)  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances (1,734,485) (1,694,288) (1,656,002)
Accumulated amortisation [Member] | Transportation units [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (8,828) (9,855)  
Additions (49) (16)  
Sales and disposals 98 1,043  
Transfer/Other changes 0 0  
Final balances (8,779) (8,828) (9,855)
Accumulated amortisation [Member] | Transportation units [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (15,872) (13,972)  
Additions (1,826) (1,928)  
Adjustments and reclassifications 0 0  
Sales and disposals 0 28  
Transfer/Other changes 0 0  
Final balances (17,698) (15,872) (13,972)
Accumulated amortisation [Member] | Transportation units [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Accumulated amortisation [Member] | Fixtures and fittings [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (2,556) (2,556)  
Additions 4 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances (2,564) (2,556) (2,556)
Accumulated amortisation [Member] | Fixtures and fittings [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (881) (858)  
Additions (23) (23)  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances (904) (881) (858)
Accumulated amortisation [Member] | Fixtures and fittings [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Accumulated amortisation [Member] | Other property, plant and equipment [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (54,136) (56,522)  
Additions (2,291) (1,326)  
Sales and disposals 0 3,712  
Transfer/Other changes 0 0  
Final balances (56,423) (54,136) (56,522)
Accumulated amortisation [Member] | Other property, plant and equipment [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (19,745) (18,796)  
Additions (1,495) (1,543)  
Adjustments and reclassifications 0 0  
Sales and disposals 0 594  
Transfer/Other changes 0 0  
Final balances (21,240) (19,745) (18,796)
Accumulated amortisation [Member] | Other property, plant and equipment [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Accumulated amortisation [Member] | Mining property [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (29,457) (29,457)  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances (29,457) (29,457) (29,457)
Accumulated amortisation [Member] | Right-of-use assets [member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (461)    
Additions 268 (461)  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances (729) (461)  
Accumulated amortisation [Member] | Asset retirement and mine closure cost asset [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (478,826) (424,008)  
Additions (61,882) (54,818)  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances (540,708) (478,826) (424,008)
Accumulated amortisation [Member] | Stripping activity asset [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (147,725) (146,058)  
Additions (1,769) (1,667)  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances (149,494) (147,725) (146,058)
Accumulated amortisation [Member] | Stripping activity asset [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (553,732) (398,202)  
Additions (124,309) (155,530)  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances (678,041) (553,732) (398,202)
Accumulated amortisation [Member] | Stripping activity asset [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     0
Accumulated amortisation [Member] | Mine developments [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (674,142) (656,484)  
Additions (5,688) (17,658)  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances (679,830) (674,142) (656,484)
Accumulated amortisation [Member] | Asset retirement costs [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (26,915) (23,676)  
Additions (4,611) (3,239)  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Final balances $ (31,526) $ (26,915) (23,676)
Accumulated amortisation [Member] | Asset retirement costs [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Additions     $ 0