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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, plant and equipments,net [Line Items]      
Opening balance $ 1,847,615 $ 1,949,555  
Balance as of December 1,754,372 1,847,615 $ 1,949,555
IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Balance as of December 6,185    
Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 840,454 855,881  
Balance as of December 1,038,294 840,454 855,881
Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 5,602,902 5,678,424  
Balance as of December 5,690,851 5,602,902 5,678,424
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]      
Property, plant and equipments,net [Line Items]      
Opening balance 3,727,403 3,596,342  
Additions 133,070 172,509  
Sales and disposals (48,153) (9,725)  
Sales 45,772 9,908  
Balance as of December 3,781,326 3,727,403 3,596,342
Gross carrying amount [Member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Balance as of December 18,528    
Gross carrying amount [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 4,309,213 4,240,611  
Additions 344,415 144,911  
Sales and disposals (85,069) (73,878)  
Transfer/Other changes (1,372) (2,431)  
Balance as of December 4,567,187 4,309,213 4,240,611
Gross carrying amount [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 8,166,652 7,758,870  
Additions 488,578 468,912  
Adjustments and reclassifications 39,238 (32,017)  
Sales and disposals (36,886) (29,113)  
Transfer/Other changes 0 0  
Balance as of December 8,753,310 8,166,652 7,758,870
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 [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 21,761 22,690  
Additions 630 783  
Sales and disposals   (462)  
Sales (135)    
Balance as of December 17,517 21,761 22,690
Gross carrying amount [Member] | Land [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 9,459 9,459  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 7,594 0  
Balance as of December 17,053 9,459 9,459
Gross carrying amount [Member] | Land [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 24,663 24,467  
Additions 0 0  
Adjustments and reclassifications 0 0  
Sales and disposals (80) 0  
Transfer/Other changes 322 196  
Balance as of December 24,905 24,663 24,467
Gross carrying amount [Member] | Land [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] | Land improvements [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 36,454 36,454  
Additions 0 0  
Sales and disposals (7,472) 0  
Transfer/Other changes 0 0  
Balance as of December 28,982 36,454 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 298,328 297,798  
Additions 0 0  
Sales and disposals (26,556) 0  
Transfer/Other changes (218) 530  
Balance as of December 271,554 298,328 297,798
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 2,449,577 2,370,042  
Additions 0 0  
Adjustments and reclassifications 544 41,089  
Sales and disposals (4,769) (9,644)  
Transfer/Other changes 102,772 48,090  
Balance as of December 2,548,124 2,449,577 2,370,042
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 958,466 929,023  
Additions 12    
Sales and disposals (30,235) (182)  
Sales (38,322) 9,205  
Balance as of December 912,704 958,466 929,023
Gross carrying amount [Member] | Machinery and equipment | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 244,560 286,865  
Additions 0 0  
Sales and disposals (46,286) (72,442)  
Transfer/Other changes 18,598 30,137  
Balance as of December 216,872 244,560 286,865
Gross carrying amount [Member] | Machinery and equipment | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 4,694,050 4,553,508  
Additions 0 0  
Adjustments and reclassifications (544) (41,089)  
Sales and disposals (30,482) (19,426)  
Transfer/Other changes 191,589 201,057  
Balance as of December 4,854,613 4,694,050 4,553,508
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 1,723,270 1,722,786  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 93,956 484  
Balance as of December 1,817,226 1,723,270 1,722,786
Gross carrying amount [Member] | Vehicles [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 10,885 9,946  
Additions 33 42  
Sales and disposals (540) (138)  
Sales (1,856) 510  
Balance as of December 8,892 10,885 9,946
Gross carrying amount [Member] | Vehicles [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 9,921 11,024  
Additions 0 0  
Sales and disposals (1,043) (1,171)  
Transfer/Other changes 524 68  
Balance as of December 9,402 9,921 11,024
Gross carrying amount [Member] | Vehicles [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 23,251 20,557  
Additions 0 0  
Adjustments and reclassifications 0 0  
Sales and disposals (32) (32)  
Transfer/Other changes 3,146 2,726  
Balance as of December 26,365 23,251 20,557
Gross carrying amount [Member] | Vehicles [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 13,306 13,902  
Additions 2    
Sales and disposals (1,310)    
Sales (1) 193  
Balance as of December 12,010 13,306 13,902
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  
Balance as of December 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  
Balance as of December 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 58,924 57,773  
Additions 0 0  
Sales and disposals (3,712) (265)  
Transfer/Other changes 4,050 1,416  
Balance as of December 59,262 58,924 57,773
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 25,491 24,977  
Additions 0 0  
Adjustments and reclassifications 0 0  
Sales and disposals (594) (11)  
Transfer/Other changes 203 525  
Balance as of December 25,100 25,491 24,977
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] | Construction in Progress [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 56,662 101,122  
Additions 44,319 67,096  
Sales and disposals (1,168) (3,450)  
Sales (78)    
Balance as of December 50,365 56,662 101,122
Gross carrying amount [Member] | Construction in Progress [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 444,688 400,410  
Additions 184,403 117,636  
Sales and disposals 0 0  
Transfer/Other changes (192,392) (73,358)  
Balance as of December 436,699 444,688 400,410
Gross carrying amount [Member] | Construction in Progress [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 185,928 149,661  
Additions 271,364 288,861  
Adjustments and reclassifications (1,192) 0  
Sales and disposals 0 0  
Transfer/Other changes (298,032) (252,594)  
Balance as of December 158,068 185,928 149,661
Gross carrying amount [Member] | Construction 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  
Balance as of December 37,521 37,521 37,521
Gross carrying amount [Member] | Right-of-use assets [member]      
Property, plant and equipments,net [Line Items]      
Additions 3,721    
Sales and disposals (10,897)    
Balance as of December 11,352    
Gross carrying amount [Member] | Right-of-use assets [member] | IFRS 16 [Member]      
Property, plant and equipments,net [Line Items]      
Balance as of December 18,528    
Gross carrying amount [Member] | Right-of-use assets [member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Additions 1,045    
Sales and disposals 0    
Transfer/Other changes 0    
Balance as of December 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]      
Additions 1,342    
Adjustments and reclassifications (700)    
Sales and disposals (929)    
Balance as of December 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 534,398 507,123  
Additions 158,967 27,275  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 693,365 534,398 507,123
Gross carrying amount [Member] | Stripping activity asset [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 141,726 130,447  
Additions 11,545 11,279  
Balance as of December 154,090 141,726 130,447
Gross carrying amount [Member] | Stripping activity asset [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 148,487 148,487  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 3,007 0  
Balance as of December 151,494 148,487 148,487
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 655,709 478,382  
Additions 197,038 177,327  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 852,747 655,709 478,382
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 760,647 722,355  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 63,509 38,292  
Balance as of December 824,156 760,647 722,355
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 107,034 136,327  
Additions 18,834 2,724  
Adjustments and reclassifications 41,130 (32,017)  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 166,998 107,034 136,327
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 (3,468,759) (3,384,730)  
Additions (141,815) (152,027)  
Sales and disposals 81,681 67,998  
Transfer/Other changes 0 0  
Balance as of December (3,528,893) (3,468,759) (3,384,730)
Accumulated amortisation [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (2,563,750) (2,080,446)  
Additions (534,047) (511,344)  
Adjustments and reclassifications 0 0  
Sales and disposals 35,338 28,040  
Transfer/Other changes 0 0  
Balance as of December (3,062,459) (2,563,750) (2,080,446)
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 (35,583) (35,143)  
Additions (101) (440)  
Sales and disposals 7,369 0  
Transfer/Other changes 0 0  
Balance as of December (28,315) (35,583) (35,143)
Accumulated amortisation [Member] | Buildings and constructions [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (247,979) (240,348)  
Additions (5,702) (7,631)  
Sales and disposals 26,579 0  
Transfer/Other changes (973) 0  
Balance as of December (226,129) (247,979) (240,348)
Accumulated amortisation [Member] | Buildings and constructions [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (321,920) (229,627)  
Additions (76,199) (96,623)  
Adjustments and reclassifications 513 5,184  
Sales and disposals 4,722 9,514  
Transfer/Other changes 0 0  
Balance as of December (393,910) (321,920) (229,627)
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 (204,255) (249,975)  
Additions (21,780) (20,887)  
Sales and disposals 42,978 66,607  
Transfer/Other changes 973 0  
Balance as of December (184,030) (204,255) (249,975)
Accumulated amortisation [Member] | Machinery and equipment | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (1,786,326)    
Additions (284,097) (292,656) (1,517,337)
Adjustments and reclassifications (513) (5,184)  
Sales and disposals 29,091 18,483  
Transfer/Other changes 0 0  
Balance as of December (2,040,819) (1,786,326)  
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 (1,656,002) (1,621,266)  
Additions (38,286) (34,736)  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December (1,694,288) (1,656,002) (1,621,266)
Accumulated amortisation [Member] | Vehicles [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (9,855) (11,024)  
Additions (16) (2)  
Sales and disposals 1,043 1,171  
Transfer/Other changes 0 0  
Balance as of December (8,828) (9,855) (11,024)
Accumulated amortisation [Member] | Vehicles [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (13,972) (12,221)  
Additions (1,928) (1,784)  
Adjustments and reclassifications 0 0  
Sales and disposals 28 33  
Transfer/Other changes 0 0  
Balance as of December (15,872) (13,972) (12,221)
Accumulated amortisation [Member] | Vehicles [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 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December (2,556) (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 (858) (834)  
Additions (23) (24)  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December (881) (858) (834)
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 (56,522) (55,914)  
Additions (1,326) (828)  
Sales and disposals 3,712 220  
Transfer/Other changes 0 0  
Balance as of December (54,136) (56,522) (55,914)
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 (18,796) (16,400)  
Additions (1,543) (2,406)  
Adjustments and reclassifications 0 0  
Sales and disposals 594 10  
Transfer/Other changes 0 0  
Balance as of December (19,745) (18,796) (16,400)
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  
Balance as of December (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]      
Additions (461)    
Sales and disposals 0    
Transfer/Other changes 0    
Balance as of December (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 (424,008) (356,345)  
Additions (54,818) (67,663)  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December (478,826) (424,008) (356,345)
Accumulated amortisation [Member] | Stripping activity asset [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (146,058) (143,252)  
Additions (1,667) (2,806)  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December (147,725) (146,058) (143,252)
Accumulated amortisation [Member] | Stripping activity asset [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (398,202) (285,327)  
Additions (155,530) (112,875)  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December (553,732) (398,202) (285,327)
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 (656,484) (639,450)  
Additions (17,658) (17,034)  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December (674,142) (656,484) (639,450)
Accumulated amortisation [Member] | Asset retirement costs [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance (23,676) (18,700)  
Additions (3,239) (4,976)  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December $ (26,915) (23,676) $ (18,700)
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