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Property, plant and equipment (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance S/ 2,273,048  
End balance 2,208,553 S/ 2,273,048
Cost [Member] | Mining Concessions [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 76,808 79,217
Additions 484
Capitalized interests  
Disposals
Transfers 136
Assets held for distribution   (3,029)
End balance 76,808 76,808
Cost [Member] | Mine Development [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 41,585 125,127
Additions 2,260 4,944
Capitalized interests  
Disposals
Transfers 1,402 1,473
Assets held for distribution   (89,959)
End balance 45,247 41,585
Cost [Member] | Land [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 219,345 219,240
Additions 9,186 44
Capitalized interests  
Disposals
Transfers 27 61
Assets held for distribution  
End balance 228,558 219,345
Cost [Member] | Buildings And Other Construction [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 657,548 436,670
Additions 232
Capitalized interests  
Disposals (1,171)
Transfers 20,328 240,992
Assets held for distribution   (20,114)
End balance 676,937 657,548
Cost [Member] | Machinery, Equipment And Related Spare Parts [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 1,436,384 986,642
Additions 12,696 13,297
Capitalized interests  
Disposals (614) (13,661)
Transfers 142,593 515,631
Assets held for distribution   (65,525)
End balance 1,591,059 1,436,384
Cost [Member] | Furniture And Accessories [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 30,513 31,097
Additions 88 109
Capitalized interests  
Disposals (17) (9)
Transfers 817 19
Assets held for distribution   (703)
End balance 31,401 30,513
Cost [Member] | Transportation Units [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 119,708 125,286
Additions 10,511 2,651
Capitalized interests  
Disposals (8,213) (7,020)
Transfers 312 502
Assets held for distribution   (1,711)
End balance 122,318 119,708
Cost [Member] | Computer Equipment And Tools [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 53,501 53,014
Additions 1,350 1,803
Capitalized interests  
Disposals (178) (18)
Transfers 3,740 1,307
Assets held for distribution   (2,605)
End balance 58,413 53,501
Cost [Member] | Mine Rehabilitation Costs [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 6,063 4,575
Additions 1,488
Capitalized interests  
Disposals
Transfers 26
Assets held for distribution  
End balance 6,089 6,063
Cost [Member] | Capitalized Interests [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 64,904 61,595
Additions
Capitalized interests   3,309
Disposals
Transfers
Assets held for distribution  
End balance 64,904 64,904
Cost [Member] | Works In Progress And Units In Transit [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 184,653 890,746
Additions 32,280 82,362
Capitalized interests  
Disposals (397) (871)
Transfers (173,664) (758,749)
Assets held for distribution   (28,835)
End balance 42,872 184,653
Cost [Member] | Total [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 2,891,012 3,013,209
Additions 68,603 107,182
Capitalized interests   3,309
Disposals (10,590) (21,579)
Transfers (4,419) 1,372
Assets held for distribution   (212,481)
End balance 2,944,606 2,891,012
Accumulated Depreciation [Member] | Mining Concessions [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 12,119 12,233
Additions 72
Disposals
Transfers  
Assets held for distribution   (186)
End balance 12,119 12,119
Accumulated Depreciation [Member] | Mine Development [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 9,753 9,457
Additions 506 296
Disposals
Transfers (509)  
Assets held for distribution  
End balance 9,750 9,753
Accumulated Depreciation [Member] | Land [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance
Additions
Disposals
Transfers  
Assets held for distribution  
End balance
Accumulated Depreciation [Member] | Buildings And Other Construction [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 68,945 52,366
Additions 17,482 17,194
Disposals (633)
Transfers  
Assets held for distribution   (615)
End balance 85,794 68,945
Accumulated Depreciation [Member] | Machinery, Equipment And Related Spare Parts [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 296,918 229,014
Additions 85,937 76,322
Disposals (221) (4,613)
Transfers  
Assets held for distribution   (3,805)
End balance 382,634 296,918
Accumulated Depreciation [Member] | Furniture And Accessories [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 27,204 26,605
Additions 728 852
Disposals (17) (3)
Transfers  
Assets held for distribution   (250)
End balance 27,915 27,204
Accumulated Depreciation [Member] | Transportation Units [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 64,710 57,983
Additions 12,966 11,104
Disposals (4,697) (2,866)
Transfers  
Assets held for distribution   (1,511)
End balance 72,979 64,710
Accumulated Depreciation [Member] | Computer Equipment And Tools [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 39,472 37,296
Additions 3,629 3,572
Disposals (335) (7)
Transfers  
Assets held for distribution   (1,389)
End balance 42,766 39,472
Accumulated Depreciation [Member] | Mine Rehabilitation Costs [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 1,432 1,432
Additions 2
Disposals
Transfers  
Assets held for distribution  
End balance 1,434 1,432
Accumulated Depreciation [Member] | Capitalized Interests [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 1,417 14
Additions 1,519 1,403
Disposals
Transfers  
Assets held for distribution  
End balance 2,936 1,417
Accumulated Depreciation [Member] | Works In Progress And Units In Transit [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance
Additions
Disposals
Transfers  
Assets held for distribution  
End balance
Accumulated Depreciation [Member] | Total [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 521,970 426,400
Additions 122,769 110,815
Disposals (5,903) (7,489)
Transfers (509)  
Assets held for distribution   (7,756)
End balance 638,327 521,970
Accumulated Impairment [Member] | Mining Concessions [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 41,213  
Additions 1,645  
End balance 42,858 41,213
Accumulated Impairment [Member] | Mine Development [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 24,048  
Additions  
End balance 24,048 24,048
Accumulated Impairment [Member] | Land [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 258  
Additions  
End balance 258 258
Accumulated Impairment [Member] | Buildings And Other Construction [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 13,837  
Additions  
End balance 13,837 13,837
Accumulated Impairment [Member] | Machinery, Equipment And Related Spare Parts [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 12,166  
Additions  
End balance 12,166 12,166
Accumulated Impairment [Member] | Furniture And Accessories [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 168  
Additions 33  
End balance 201 168
Accumulated Impairment [Member] | Transportation Units [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 26  
Additions  
End balance 26 26
Accumulated Impairment [Member] | Computer Equipment And Tools [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 400  
Additions 54  
End balance 454 400
Accumulated Impairment [Member] | Mine Rehabilitation Costs [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 3,143  
Additions  
End balance 3,143 3,143
Accumulated Impairment [Member] | Capitalized Interests [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance  
Additions  
End balance
Accumulated Impairment [Member] | Works In Progress And Units In Transit [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 735  
Additions  
End balance 735 735
Accumulated Impairment [Member] | Total [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 95,994  
Additions 1,732  
End balance 97,726 95,994
Carrying Amount [Member] | Mining Concessions [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 23,476  
Total Assets held for distribution 2,843  
End balance 21,831 23,476
Carrying Amount [Member] | Mine Development [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 7,784  
Total Assets held for distribution 89,959  
End balance 11,449 7,784
Carrying Amount [Member] | Land [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 219,087  
Total Assets held for distribution  
End balance 228,300 219,087
Carrying Amount [Member] | Buildings And Other Construction [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 574,766  
Total Assets held for distribution 19,499  
End balance 577,306 574,766
Carrying Amount [Member] | Machinery, Equipment And Related Spare Parts [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 1,127,300  
Total Assets held for distribution 61,720  
End balance 1,196,259 1,127,300
Carrying Amount [Member] | Furniture And Accessories [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 3,141  
Total Assets held for distribution 453  
End balance 3,285 3,141
Carrying Amount [Member] | Transportation Units [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 54,972  
Total Assets held for distribution 200  
End balance 49,313 54,972
Carrying Amount [Member] | Computer Equipment And Tools [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 13,629  
Total Assets held for distribution 1,216  
End balance 15,193 13,629
Carrying Amount [Member] | Mine Rehabilitation Costs [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 1,488  
Total Assets held for distribution  
End balance 1,512 1,488
Carrying Amount [Member] | Capitalized Interests [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 63,487  
Total Assets held for distribution  
End balance 61,968 63,487
Carrying Amount [Member] | Works In Progress And Units In Transit [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 183,918  
Total Assets held for distribution 28,835  
End balance 42,137 183,918
Carrying Amount [Member] | Total [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 2,273,048  
Total Assets held for distribution 204,725  
End balance S/ 2,208,553 S/ 2,273,048