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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.

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