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Property, plant and equipment, net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, plant and equipments,net [Line Items]      
Opening balance $ 1,949,555 $ 1,960,025  
Balance as of December 1,847,615 1,949,555 $ 1,960,025
Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 855,881 794,831  
Balance as of December 840,454 855,881 794,831
Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 5,678,424 5,807,740  
Balance as of December 5,602,902 5,678,424 5,807,740
Asset retirement and mine closure cost asset [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Additions 27,200 97,000  
Accumulated depreciation and amortisation [member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 3,384,730 3,389,171  
Additions 152,027 83,992  
Sales and disposals (67,998) (88,433)  
Transfer/Other changes 0 0  
Balance as of December 3,468,759 3,384,730 3,389,171
Accumulated depreciation and amortisation [member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 2,080,446 1,630,715  
Additions 511,344 455,513  
Adjustments and reclassifications 0 0  
Sales and disposals (28,040) (5,782)  
Transfer/Other changes 0 0  
Balance as of December 2,563,750 2,080,446 1,630,715
Accumulated depreciation and amortisation [member] | Land improvement [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 35,143 35,053  
Additions 440 90  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 35,583 35,143 35,053
Accumulated depreciation and amortisation [member] | Buildings and constructions [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 240,348 235,340  
Additions 7,631 5,020  
Sales and disposals 0 (12)  
Transfer/Other changes 0 0  
Balance as of December 247,979 240,348 235,340
Accumulated depreciation and amortisation [member] | Buildings and constructions [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 229,627 144,862  
Additions 96,623 86,391  
Adjustments and reclassifications 5,184 (457)  
Sales and disposals (9,514) (1,169)  
Transfer/Other changes 0 0  
Balance as of December 321,920 229,627 144,862
Accumulated depreciation and amortisation [member] | Machinery [member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 249,975 329,965  
Additions 20,887 8,431  
Sales and disposals (66,607) (88,421)  
Transfer/Other changes 0 0  
Balance as of December 204,255 249,975 329,965
Accumulated depreciation and amortisation [member] | Machinery [member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 1,517,337 1,237,979  
Additions 292,656 283,250  
Adjustments and reclassifications (5,184) 457  
Sales and disposals (18,483) (4,349)  
Transfer/Other changes 0 0  
Balance as of December 1,786,326 1,517,337 1,237,979
Accumulated depreciation and amortisation [member] | Leach pads [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 1,621,266 1,588,205  
Additions 34,736 33,061  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 1,656,002 1,621,266 1,588,205
Accumulated depreciation and amortisation [member] | Vehicles [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 11,024 11,003  
Additions 2 21  
Sales and disposals (1,171) 0  
Transfer/Other changes 0 0  
Balance as of December 9,855 11,024 11,003
Accumulated depreciation and amortisation [member] | Vehicles [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 12,221 10,865  
Additions 1,784 1,593  
Adjustments and reclassifications 0 0  
Sales and disposals (33) (237)  
Transfer/Other changes 0 0  
Balance as of December 13,972 12,221 10,865
Accumulated depreciation and 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 depreciation and amortisation [member] | Fixtures and fittings [member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 834 802  
Additions 24 32  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 858 834 802
Accumulated depreciation and amortisation [member] | Other property, plant and equipment [member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 55,914 55,645  
Additions 828 269  
Sales and disposals (220) 0  
Transfer/Other changes 0 0  
Balance as of December 56,522 55,914 55,645
Accumulated depreciation and 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 16,400 13,953  
Additions 2,406 2,474  
Adjustments and reclassifications 0 0  
Sales and disposals (10) (27)  
Transfer/Other changes 0 0  
Balance as of December 18,796 16,400 13,953
Accumulated depreciation and 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 depreciation and 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 356,345 337,173  
Additions 67,663 19,172  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 424,008 356,345 337,173
Accumulated depreciation and amortisation [member] | Stripping activity asset [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 143,252 142,170  
Additions 2,806 1,082  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 146,058 143,252 142,170
Accumulated depreciation and amortisation [member] | Stripping activity asset [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 285,327 209,065  
Additions 112,875 76,262  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 398,202 285,327 209,065
Accumulated depreciation and amortisation [member] | Mine developments [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 639,450 622,604  
Additions 17,034 16,846  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 656,484 639,450 622,604
Accumulated depreciation and amortisation [member] | Asset retirement costs [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 18,700 13,189  
Additions 4,976 5,511  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 23,676 18,700 13,189
Gross carrying amount [member]      
Property, plant and equipments,net [Line Items]      
Opening balance 3,596,342 3,501,216  
Additions 172,509 277,824  
Sales and disposals (9,725)   (18,056)
Balance as of December 3,727,403 3,596,342 3,501,216
Gross carrying amount [member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 4,240,611 4,184,002  
Additions 144,911 148,950  
Sales and disposals (73,878) (92,341)  
Transfer/Other changes (2,431) 0  
Balance as of December 4,309,213 4,240,611 4,184,002
Gross carrying amount [member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 7,758,870 7,438,455  
Additions 468,912 330,129  
Adjustments and reclassifications (32,017) (3,710)  
Sales and disposals (29,113) (6,004)  
Transfer/Other changes 0 0  
Balance as of December 8,166,652 7,758,870 7,438,455
Gross carrying amount [member] | Land [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 22,690 22,958  
Additions 783 0  
Sales and disposals (462)   0
Balance as of December 21,761 22,690 22,958
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 0 0  
Balance as of December 9,459 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 24,467 23,683  
Additions 0 0  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 196 784  
Balance as of December 24,663 24,467 23,683
Gross carrying amount [member] | Land improvement [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 0 0  
Transfer/Other changes 0  
Balance as of December 36,454 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 297,798 236,551  
Additions 0 0  
Sales and disposals 0 (42)  
Transfer/Other changes 530 61,289  
Balance as of December 298,328 297,798 236,551
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 2,370,042 2,376,961  
Additions 0 0  
Adjustments and reclassifications 41,089 (13,532)  
Sales and disposals (9,644) (1,169)  
Transfer/Other changes 48,090 7,782  
Balance as of December 2,449,577 2,370,042 2,376,961
Gross carrying amount [member] | Machinery [member]      
Property, plant and equipments,net [Line Items]      
Opening balance 929,023 986,032  
Additions 0 2,579  
Sales and disposals (182)   (3,749)
Balance as of December 958,466 929,023 986,032
Gross carrying amount [member] | Machinery [member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 286,865 379,164  
Additions 0 0  
Sales and disposals (72,442) (92,299)  
Transfer/Other changes 30,137 0  
Balance as of December 244,560 286,865 379,164
Gross carrying amount [member] | Machinery [member] | Sociedad Minera Cerro Verde S.A.A. [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 4,553,508 4,442,180  
Additions 0 0  
Adjustments and reclassifications (41,089) 13,532  
Sales and disposals (19,426) (4,540)  
Transfer/Other changes 201,057 102,336  
Balance as of December 4,694,050 4,553,508 4,442,180
Gross carrying amount [member] | Leach pads [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 1,722,786 1,670,835  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 484 51,951  
Balance as of December 1,723,270 1,722,786 1,670,835
Gross carrying amount [member] | Vehicles [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 9,946 10,416  
Additions 42 11  
Sales and disposals (138)   (190)
Balance as of December 10,885 9,946 10,416
Gross carrying amount [member] | Vehicles [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 11,024 11,024  
Additions 0 0  
Sales and disposals (1,171) 0  
Transfer/Other changes 68 0  
Balance as of December 9,921 11,024 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 20,557 19,110  
Additions 0 0  
Adjustments and reclassifications 0 0  
Sales and disposals (32) (261)  
Transfer/Other changes 2,726 1,708  
Balance as of December 23,251 20,557 19,110
Gross carrying amount [member] | Fixtures and fittings [member]      
Property, plant and equipments,net [Line Items]      
Opening balance 13,902 14,047  
Additions 0 31  
Sales and disposals 0   (157)
Balance as of December 13,306 13,902 14,047
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] | Other property, plant and equipment [member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 57,773 57,773  
Additions 0 0  
Sales and disposals (265) 0  
Transfer/Other changes 1,416 0  
Balance as of December 58,924 57,773 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 24,977 24,671  
Additions 0 0  
Adjustments and reclassifications 0 0  
Sales and disposals (11) (34)  
Transfer/Other changes 525 340  
Balance as of December 25,491 24,977 24,671
Gross carrying amount [member] | Construction in Progress [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 101,122 105,788  
Additions 67,096 173,333  
Sales and disposals (3,450)   0
Balance as of December 56,662 101,122 105,788
Gross carrying amount [member] | Construction in Progress [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 400,410 483,225  
Additions 117,636 51,624  
Sales and disposals 0 0  
Transfer/Other changes (73,358) (134,439)  
Balance as of December 444,688 400,410 483,225
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 149,661 88,766  
Additions 288,861 173,845  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes (252,594) (112,950)  
Balance as of December 185,928 149,661 88,766
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] | Asset retirement and mine closure cost asset [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 507,123 409,797  
Additions 27,275 97,326  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 534,398 507,123 409,797
Gross carrying amount [member] | Stripping activity asset [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance [1] 130,447 124,467  
Additions [1] 11,279 18,282  
Sales and disposals [1] 0   (13,573)
Balance as of December [1] 141,726 130,447 124,467
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 0 0  
Balance as of December 148,487 148,487 148,487
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 478,382 324,759  
Additions 177,327 153,623  
Adjustments and reclassifications 0 0  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December 655,709 478,382 324,759
Gross carrying amount [member] | Mine developments [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Property, plant and equipments,net [Line Items]      
Opening balance 722,355 701,156  
Additions 0 0  
Sales and disposals 0 0  
Transfer/Other changes 38,292 21,199  
Balance as of December 760,647 722,355 701,156
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 136,327 137,376  
Additions 2,724 2,661  
Adjustments and reclassifications (32,017) (3,710)  
Sales and disposals 0 0  
Transfer/Other changes 0 0  
Balance as of December $ 107,034 $ 136,327 $ 137,376
[1] In mid-2016, a landslide occurred in the west wall of the Tajo Norte; consequently, it was decided not to mine this area due to stability and operational design issues. According to the distribution of reserves, this area (Phase 10) contained 5.5 MT of ore and 9.2 MT of waste valued at US$13,573,000, which were withdrawn from the reserves in the year 2017.