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Property, plant and equipment, net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, plant and equipments,net [Line Items]    
Opening balance $ 1,960,025 $ 1,747,624
Balance as of December 1,949,555 1,960,025
Minera Yanacocha SRL and subsidiary [Member]    
Property, plant and equipments,net [Line Items]    
Opening balance 794,831 1,360,310
Balance as of December 855,881 794,831
Sociedad Minera Cerro Verde S.A.A. [Member]    
Property, plant and equipments,net [Line Items]    
Opening balance 5,807,740 6,077,289
Balance as of December 5,678,424 5,807,740
Machinery [member]    
Property, plant and equipments,net [Line Items]    
Adjustments and reclassifications   6,640
Accumulated depreciation and amortisation [member] | Minera Yanacocha SRL and subsidiary [Member]    
Property, plant and equipments,net [Line Items]    
Opening balance 3,389,171 3,398,016
Additions 83,992 132,387
Sales and disposals (88,433) (141,232)
Transfer/Other changes 0 0
Impairment loss   0
Balance as of December 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 1,630,715 1,169,233
Additions 455,513 472,121
Adjustments and reclassifications 0 0
Sales and disposals (5,782) (10,639)
Transfer/Other changes 0 0
Balance as of December 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 35,053 35,266
Additions 90 298
Sales and disposals 0 0
Transfer/Other changes 0 (511)
Impairment loss   0
Balance as of December 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 235,340 196,515
Additions 5,020 61,530
Sales and disposals (12) (22,705)
Transfer/Other changes 0 0
Impairment loss   0
Balance as of December 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 144,862 60,903
Additions 86,391 88,925
Adjustments and reclassifications (457) (30)
Sales and disposals (1,169) (4,936)
Transfer/Other changes 0 0
Balance as of December 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 329,965 429,910
Additions 8,431 12,230
Sales and disposals (88,421) (112,175)
Transfer/Other changes 0 0
Impairment loss   0
Balance as of December 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 1,237,979 966,525
Additions 283,250 275,388
Adjustments and reclassifications 457 30
Sales and disposals (4,349) (3,964)
Transfer/Other changes 0 0
Balance as of December 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 1,588,205 1,565,508
Additions 33,061 22,697
Sales and disposals 0 0
Transfer/Other changes 0 0
Impairment loss   0
Balance as of December 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 11,003 14,620
Additions 21 2,735
Sales and disposals 0 (6,352)
Transfer/Other changes 0 0
Impairment loss   0
Balance as of December 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 10,865 9,723
Additions 1,593 1,828
Adjustments and reclassifications 0 0
Sales and disposals (237) (686)
Transfer/Other changes 0 0
Balance as of December 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 2,547
Additions 0 9
Sales and disposals 0 0
Transfer/Other changes 0 0
Impairment loss   0
Balance as of December 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 802 777
Additions 32 26
Adjustments and reclassifications 0 0
Sales and disposals 0 (1)
Transfer/Other changes 0 0
Balance as of December 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 55,645 53,964
Additions 269 1,681
Sales and disposals 0 0
Transfer/Other changes 0 0
Impairment loss   0
Balance as of December 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 13,953 12,582
Additions 2,474 2,423
Adjustments and reclassifications 0 0
Sales and disposals (27) (1,052)
Transfer/Other changes 0 0
Balance as of December 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
Impairment loss   0
Balance as of December 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 337,173 318,405
Additions 19,172 18,768
Sales and disposals 0 0
Transfer/Other changes 0 0
Impairment loss   0
Balance as of December 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 142,170 138,178
Additions 1,082 3,992
Sales and disposals 0 0
Transfer/Other changes 0 0
Impairment loss   0
Balance as of December 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 209,065 111,552
Additions 76,262 97,513
Adjustments and reclassifications 0 0
Sales and disposals 0 0
Transfer/Other changes 0 0
Balance as of December 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 622,604 613,646
Additions 16,846 8,447
Sales and disposals 0 0
Transfer/Other changes 0 511
Impairment loss   0
Balance as of December 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 137,376 149,724
Additions 2,661 3,743
Adjustments and reclassifications (3,710) 0
Sales and disposals 0 0
Transfer/Other changes 0 0
Balance as of December 136,327 137,376
Gross carrying amount [member]    
Property, plant and equipments,net [Line Items]    
Opening balance 3,501,216 3,021,340
Additions 277,824 408,898
Adjustments and reclassifications   78,660
Sales and disposals (18,056) (7,323)
Balance as of December 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 4,184,002 4,758,326
Additions 148,950 456,908
Sales and disposals (92,341) (158,755)
Transfer/Other changes 0 (248)
Impairment loss   (872,229)
Balance as of December 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 7,438,455 7,246,522
Additions 330,129 219,880
Adjustments and reclassifications (3,710) (16,091)
Sales and disposals (6,004) (11,856)
Transfer/Other changes 0 0
Balance as of December 7,758,870 7,438,455
Gross carrying amount [member] | Land [member]    
Property, plant and equipments,net [Line Items]    
Opening balance 22,958 22,454
Additions 0 162
Adjustments and reclassifications   78
Sales and disposals 0 0
Balance as of December 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 11,521
Additions 0 0
Sales and disposals 0 0
Transfer/Other changes 0 201
Impairment loss   (2,263)
Balance as of December 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 23,683 20,384
Additions 0 0
Adjustments and reclassifications 0 0
Sales and disposals 0 0
Transfer/Other changes 784 3,299
Balance as of December 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 41,909
Additions 0 0
Sales and disposals 0 0
Transfer/Other changes 0 0
Impairment loss   (5,455)
Balance as of December 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 236,551 274,262
Additions 0 0
Sales and disposals (42) (26,410)
Transfer/Other changes 61,289 26,396
Impairment loss   (37,697)
Balance as of December 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 2,376,961 2,202,122
Additions 0 0
Adjustments and reclassifications (13,532) (11,114)
Sales and disposals (1,169) (5,633)
Transfer/Other changes 7,782 191,586
Balance as of December 2,370,042 2,376,961
Gross carrying amount [member] | Machinery [member]    
Property, plant and equipments,net [Line Items]    
Opening balance 986,032 827,225
Additions 2,579 46,152
Adjustments and reclassifications   9,425
Sales and disposals (3,749) (6,569)
Balance as of December 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 379,164 511,942
Additions 0 0
Sales and disposals (92,299) (125,064)
Transfer/Other changes 0 22,865
Impairment loss   (30,579)
Balance as of December 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 4,442,180 4,203,431
Additions 0 0
Adjustments and reclassifications 13,532 11,114
Sales and disposals (4,540) (4,427)
Transfer/Other changes 102,336 232,062
Balance as of December 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 1,670,835 1,890,823
Additions 0 0
Sales and disposals 0 0
Transfer/Other changes 51,951 15,276
Impairment loss   (235,264)
Balance as of December 1,722,786 1,670,835
Gross carrying amount [member] | Vehicles [member]    
Property, plant and equipments,net [Line Items]    
Opening balance 10,416 10,649
Additions 11 174
Adjustments and reclassifications   357
Sales and disposals (190) (341)
Balance as of December 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 15,198
Additions 0 0
Sales and disposals 0 (4,168)
Transfer/Other changes 0 0
Impairment loss   (6)
Balance as of December 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 19,110 19,627
Additions 0 0
Adjustments and reclassifications 0 0
Sales and disposals (261) (730)
Transfer/Other changes 1,708 213
Balance as of December 20,557 19,110
Gross carrying amount [member] | Fixtures and fittings [member]    
Property, plant and equipments,net [Line Items]    
Opening balance 14,047 13,429
Additions 31 89
Adjustments and reclassifications   359
Sales and disposals (157) (61)
Balance as of December 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
Impairment loss   0
Balance as of December 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 949 950
Additions 0 0
Adjustments and reclassifications 0 0
Sales and disposals 0 (1)
Transfer/Other changes 0 0
Balance as of December 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 60,462
Additions 0 353
Sales and disposals 0 0
Transfer/Other changes 0 217
Impairment loss   (3,259)
Balance as of December 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 24,671 24,728
Additions 0 0
Adjustments and reclassifications 0 0
Sales and disposals (34) (1,065)
Transfer/Other changes 340 1,008
Balance as of December 24,977 24,671
Gross carrying amount [member] | Construction in progress [member]    
Property, plant and equipments,net [Line Items]    
Opening balance 105,788 68,123
Additions 173,333 210,915
Adjustments and reclassifications   1,037
Sales and disposals 0 (352)
Balance as of December 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 483,225 476,353
Additions 51,624 78,609
Sales and disposals 0 0
Transfer/Other changes (134,439) (70,282)
Impairment loss   (1,455)
Balance as of December 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 88,766 362,058
Additions 173,845 154,876
Adjustments and reclassifications 0 0
Sales and disposals 0 0
Transfer/Other changes (112,950) (428,168)
Balance as of December 149,661 [1] 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 49,544
Additions 0 0
Sales and disposals 0 (3,113)
Transfer/Other changes 0 0
Impairment loss   (8,910)
Balance as of December 37,521 37,521
Gross carrying amount [member] | Asset retirement and mine closure cost asset [Member]    
Property, plant and equipments,net [Line Items]    
Additions   352,000
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 409,797 452,145
Additions 97,326 351,798
Sales and disposals 0 0
Transfer/Other changes 0 0
Impairment loss   (394,146)
Balance as of December 507,123 409,797
Gross carrying amount [member] | Stripping activity asset [Member]    
Property, plant and equipments,net [Line Items]    
Opening balance 18,729 12,916
Additions 16,343 5,813
Adjustments and reclassifications [2]   0
Sales and disposals 0 0
Balance as of December 41,695 18,729
Gross carrying amount [member] | Stripping activity asset [Member] | Minera Yanacocha SRL and subsidiary [Member]    
Property, plant and equipments,net [Line Items]    
Opening balance 148,487 157,048
Additions 0 26,148
Sales and disposals 0 0
Transfer/Other changes 0 0
Impairment loss   (34,709)
Balance as of December 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 324,759 263,498
Additions 153,623 61,261
Adjustments and reclassifications 0 0
Sales and disposals 0 0
Transfer/Other changes 0 0
Balance as of December 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 701,156 814,563
Additions 0 0
Sales and disposals 0 0
Transfer/Other changes 21,199 5,079
Impairment loss   (118,486)
Balance as of December 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 13,189 7,171
Additions 5,511 6,018
Adjustments and reclassifications 0 (16,091)
Sales and disposals   0
Transfer/Other changes 0 0
Balance as of December $ 18,700 $ 13,189
[1] As of December 31, 2017 construction in progress relates to the tailing cyclone relocation (US$47.5 million), mine maintenance truck shop (US$38.4 million) and the purchase of used Komatsu 930E haul trucks from PT Freeport Indonesia (related party) (US$17.1 million).
[2] 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.