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Consolidated statements of cash flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities      
Loss for the year $ (11,654) $ 64,435 $ (327,814)
Proceeds from sales 1,216,294 1,197,523 1,003,422
Tax recovery 106,656 102,548 117,661
Dividends received 46,792 9,823 142,340
Proceeds from insurance claim 38,793 0 0
Royalty received 20,013 21,565 25,961
Interest received 2,383 3,169 2,140
Payments to suppliers and third parties (861,282) (872,467) (672,419)
Payments to employees (151,602) (160,891) (138,113)
Income tax paid (30,898) (38,121) (35,401)
Interest paid (27,699) (30,402) (34,138)
Payments of mining royalties (13,190) (20,165) (20,052)
Adjustments to reconcile profit after income tax to net cash flows from operating activities:      
Reversal of the write-down of ore on leach pads to realizable value 119 0 7,581
Net (increase) decrease in operating liabilities:      
Net cash and cash equivalents provided by operating activities 346,260 212,582 391,401
Investing activities      
Proceeds from sale of mining concessions, development costs, property, plant and equipment 2,240 1,962 7,180
Additions to mining concessions, development costs, property, plant and equipment (111,270) (259,507) (366,834)
Payments for acquisition of other assets (8,529) (5,405) (5,222)
Proceeds from collection of loan to an associate 0 124,800 0
Net cash and cash equivalents used in investing activities (117,559) (138,150) (364,876)
Financing activities      
Proceeds from bank loans 95,000 341,215 200,500
Payments of bank loans (95,000) (300,000) (442,957)
Proceeds from financial obligations 0 80,000 275,210
Payments of financial obligations (45,222) (32,599) (33,476)
Dividends paid to controlling shareholders (22,860) (22,099) (7,621)
Dividends paid to non-controlling shareholders (5,560) (6,036) (7,400)
Increase of restricted bank accounts (410) (285) (2,087)
Purchase of treasury share 0 0 (1,210)
Acquisition of non-controlling interest 0 (621) (5,459)
Net cash and cash equivalents provided by (used in) financing activities (74,052) 59,575 (24,500)
Increase in cash and cash equivalents for the year, net 154,649 134,007 2,025
Cash and cash equivalents at beginning of year 214,551 80,544 78,519
Cash and cash equivalents at year-end 369,200 214,551 80,544
Financing and investing activities not affecting cash flows:      
Changes in mine closures plans 42,874 10,594 34,532
Contingent consideration liability 1,815 1,773 2,349
Accounts receivable from sale of assets 2,715 5,371 5,204
Minera Yanacocha SRL and subsidiary [Member]      
Operating activities      
Loss for the year (81,517) (175,454) (1,043,752)
Adjustments to reconcile profit after income tax to net cash flows from operating activities:      
Impairment loss 0 0 889,499
Depreciation and amortization 156,212 87,783 140,712
Deferred income tax (1,071) 0 0
Unwinding of discount of the provision for reclamation 36,015 21,769 14,104
Unwinding of discount of debt instruments 735 0 0
Write-off of fixed assets 0 1,368 14,036
Loss (gain) for fixed asset sales 624 (603) (311)
Write-down of ore on leach pads to realizable value 90,365 77,385 100,179
Reversal of the write-down of ore on leach pads to realizable value (63,778) (99,219) (106,103)
Allowance for obsolescence of materials and supplies 439 1,804 (609)
Net (increase) decrease in operating assets:      
Trade and other receivables (7,580) (7,345) (14,586)
Prepaid Income Tax 12,706 (13,770) (18,175)
Value added tax credit 13,856 29,543 7,414
Inventories and Stockpiles and ore on leach pads 7,120 103,334 99,237
Prepaid expenses (345) (71) 180
Financial assets at fair value 0 (5,000) 0
Net (increase) decrease in operating liabilities:      
Trade and other payables 3,196 17,346 (10,654)
Income tax payable 0 0 (12,346)
Adjustments for provisions 14,090 77,296 91,842
Adjustments for reclamation liabilities paid (19,842) (21,376) (10,467)
Net cash and cash equivalents provided by operating activities 161,225 94,790 140,200
Investing activities      
Proceeds from sale of mining concessions, development costs, property, plant and equipment 4,821 2,235 471
Additions to mining concessions, development costs, property, plant and equipment (117,636) (51,624) (106,908)
Restricted cash (48,127) 0 0
Net cash and cash equivalents used in investing activities (160,942) (49,389) (106,437)
Financing activities      
Purchase of treasury share 0 (47,911) 0
Dividends declared and paid 0 0 (300,000)
Proceeds From Sale Of Shares 47,911 0 0
Net cash and cash equivalents provided by (used in) financing activities 47,911 (47,911) (300,000)
Increase in cash and cash equivalents for the year, net 48,194 (2,510) (266,237)
Cash and cash equivalents at beginning of year 675,014 677,524 943,761
Cash and cash equivalents at year-end 723,208 675,014 677,524
Transactions with no effects in cash flows:      
Addition of asset retirement and mine closure 27,275 97,326 351,798
Sociedad Minera Cerro Verde S.A.A. [Member]      
Operating activities      
Loss for the year 119,710 349,881 340,907
Interest paid (47,442) (50,510) (64,325)
Income tax (430,810) (282,273) (68,557)
Adjustments to reconcile profit after income tax to net cash flows from operating activities:      
Depreciation and amortization 512,298 456,467 472,997
Accretion on remediation and mine closure provision 4,322 4,595 4,391
Income tax expense 366,998 486,043 263,082
Net loss on sale of Property, Plant and Equipment 964 185 982
Mining royalty dispute 323,096 295,773 0
Other accounts payable 48,130 49,915 70,939
Net (increase) decrease in operating assets:      
Trade and other receivables 67,475 (38,922) (161,335)
Other accounts receivable 1,954 (5,776) 2,008
Inventories and Stockpiles and ore on leach pads (49,371) 32,101 (11,341)
Other non-financial assets (76,186) 226,969 113,355
Net (increase) decrease in operating liabilities:      
Provisions related to benefits to employees (50,440) 33,258 27,503
Other provisions (11,561) 70,648 (60,863)
Trade and other payables 29,419 (13,663) 16,229
Net cash and cash equivalents provided by operating activities 808,556 1,614,691 945,972
Investing activities      
Proceeds from sale of mining concessions, development costs, property, plant and equipment 109 37 235
Additions to mining concessions, development costs, property, plant and equipment (280,183) (152,769) (421,610)
Stripping activity asset (177,327) (153,623) (61,261)
Other inflows (outflows) of cash, classified as investing activities 0 0 3,832
Net cash and cash equivalents used in investing activities (457,401) (306,355) (478,804)
Financing activities      
Proceeds from bank loans 0 233,333 350,000
Proceeds from shareholders loans     0
Payments of bank loans (250,000) (353,333) (793,000)
Payments of shareholders loans 0 (606,014)  
Debt issuance costs 0 (12,085) 0
Amortization of leasing 0 (161) (169)
Dividends declared and paid (200,000) 0 0
Net cash and cash equivalents provided by (used in) financing activities (450,000) (738,260) (443,169)
Increase in cash and cash equivalents for the year, net (98,845) 570,076 23,999
Cash and cash equivalents at beginning of year 600,027 29,951 5,952
Cash and cash equivalents at year-end 501,182 600,027 29,951
Non cash transactions      
Increase decrease in provision for remediation and mine closure $ 32,017 $ 3,710 $ 16,091