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Consolidated statements of profit or loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating income      
Net sales of goods $ 1,223,942 $ 1,015,670 $ 846,269
Net sales of services 29,697 28,782 50,839
Royalty income 20,739 24,339 32,414
Total operating income 1,274,378 1,068,791 929,522
Operating costs      
Cost of sales of goods, excluding depreciation and amortization (627,433) (497,812) (513,490)
Cost of services, excluding depreciation and amortization (12,954) (10,754) (59,612)
Exploration in operating units (94,928) (96,149) (89,699)
Depreciation and amortization (213,722) (192,647) (232,583)
Mining royalties (31,217) (27,611) (27,188)
Total operating costs (980,254) (824,973) (922,572)
Gross profit 294,124 243,818 6,950
Operating expenses, net      
Administrative expenses (83,597) (81,692) (84,372)
Exploration in non-operating areas (18,262) (26,589) (30,610)
Selling expenses (24,088) (21,733) (19,365)
Impairment loss of long-lived assets (21,620) 0 (3,803)
Provision for contingencies and others (13,879) (565) (395)
Write-off of stripping activity asset (13,573) 0 0
Other operating expenses (13,589) 18,957 (5,340)
Total operating expenses, net (188,608) (111,622) (143,885)
Operating profit (loss) 105,516 132,196 (136,935)
Other income (expense), net      
Share in the results of associates under equity method 13,207 (365,321) (173,375)
Finance income 5,517 6,830 11,026
Finance costs (34,623) (31,580) (27,572)
Net gain (loss) from currency exchange difference 2,928 2,638 (13,693)
Total other income (expenses), net (12,971) (387,433) (203,614)
Profit (loss) before income tax 92,545 (255,237) (340,549)
Income tax      
Current (23,837) (39,444) (14,222)
Deferred 5,825 (14,060) (541)
Profit (loss) from continuing operations 74,533 (308,741) (355,312)
Income tax (expense) benefit 18,012 53,504 14,763
Discontinued operations      
Loss from discontinued operations (10,098) (19,073) (20,233)
Profit (loss)for the year 64,435 (327,814) (375,545)
Attributable to:      
Owners of the parent 60,823 (323,492) (317,210)
Non-controlling interest 3,612 (4,322) (58,335)
Loss for the year $ 64,435 $ (327,814) $ (375,545)
Basic and diluted profit (loss) per share attributable to equity holders of the parent, stated in U.S. dollars $ 0.24 $ (1.27) $ (1.25)
Profit (loss) for continuing operations, basic and diluted per share attributable to equity holders of the parent, expressed in US dollars $ 0.28 $ (1.2) $ (1.17)
Other comprehensive income to be reclassified to profit or loss in subsequent periods      
Total comprehensive loss for the year $ 45,149 $ (333,204) $ (376,087)
Minera Yanacocha SRL and subsidiary [Member]      
Operating income      
Net sales of goods 645,176 761,193 1,031,174
Other operating income 21,870 17,713 10,625
Total operating income 667,046 778,906 1,041,799
Operating costs      
Cost of sales of goods, excluding depreciation and amortization (746,918) (776,394) (758,033)
Other operating costs (2,062) (2,951) (2,524)
Total operating costs (748,980) (779,345) (760,557)
Gross profit (81,934) (439) 281,242
Operating expenses, net      
Administrative expenses (4,760) (8,780) (20,028)
Selling expenses (3,921) (3,695) (3,534)
Impairment loss of long-lived assets 0 (889,499) 0
Other operating expenses (63,514) (71,496) (82,846)
Total operating expenses, net (72,195) (973,470) (106,408)
Operating profit (loss) (154,129) (973,909) 174,834
Other income (expense), net      
Finance income 5,831 2,132 673
Finance costs (23,766) (15,107) (22,734)
Net gain (loss) from currency exchange difference 3,636 (13,741) (251)
Total other income (expenses), net (14,299) (26,716) (22,312)
Profit (loss) before income tax (168,428) (1,000,625) 152,522
Income tax      
Income tax (expense) benefit (7,026) (43,127) (602,717)
Discontinued operations      
Profit (loss)for the year (175,454) (1,043,752) (450,195)
Attributable to:      
Loss for the year (175,454) (1,043,752) (450,195)
Other comprehensive income to be reclassified to profit or loss in subsequent periods      
Changes in the fair value of available-for-sale financial asset, net of tax effect (3,244) 651 (757)
Total comprehensive loss for the year (178,698) (1,043,101) (450,952)
Sociedad Minera Cerro Verde S.A.A. [Member]      
Operating income      
Net sales of goods 3,202,931 2,384,154 1,115,617
Operating costs      
Cost of sales of goods, excluding depreciation and amortization (1,768,238) (1,553,040) (862,004)
Gross profit 1,434,693 831,114 253,613
Operating expenses, net      
Selling expenses (141,669) (131,391) (56,215)
Other operating expenses (258,826) (24,107) (26,739)
Other operating income     139
Total operating expenses, net (400,495) (155,498) (82,815)
Operating profit (loss) 1,034,198 675,616 170,798
Other income (expense), net      
Finance income 5,350 954 512
Finance costs (216,912) (80,438) (16,010)
Net gain (loss) from currency exchange difference 13,288 7,857 (75,770)
Total other income (expenses), net (198,274) (71,627) (91,268)
Profit (loss) before income tax 835,924 603,989 79,530
Income tax      
Income tax (expense) benefit (486,043) (263,082) (46,246)
Discontinued operations      
Profit (loss)for the year 349,881 340,907 33,284
Attributable to:      
Loss for the year $ 349,881 $ 340,907 $ 33,284
Basic and diluted profit (loss) per share attributable to equity holders of the parent, stated in U.S. dollars $ 1 $ 0.974 $ 0.095