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Consolidated statements of changes in equity - USD ($)
Capital stock, net of treasury shares [member]
Minera Yanacocha SRL and subsidiary [Member]
Capital stock, net of treasury shares [member]
Sociedad Minera Cerro Verde Saa [Member]
Capital stock, net of treasury shares [member]
Other reserves of equity [member]
Minera Yanacocha SRL and subsidiary [Member]
Other reserves of equity [member]
Other capital contributions
Sociedad Minera Cerro Verde Saa [Member]
Retained Earnings [Member]
Minera Yanacocha SRL and subsidiary [Member]
Retained Earnings [Member]
Sociedad Minera Cerro Verde Saa [Member]
Retained Earnings [Member]
Equity attributable to owners of parent [member]
Non-controlling interests [member]
Additional Paid-in Capital [Member]
Minera Yanacocha SRL and subsidiary [Member]
Additional Paid-in Capital [Member]
Legal reserve [member]
Miscellaneous other reserves [member]
Sociedad Minera Cerro Verde Saa [Member]
Miscellaneous other reserves [member]
Investment Share [Member]
Minera Yanacocha SRL and subsidiary [Member]
Sociedad Minera Cerro Verde Saa [Member]
Total
Balance at Dec. 31, 2017 $ 398,216,000 $ 990,659,000 $ 750,497,000 $ (1,505,000) $ (13,888,000) $ 0 $ 310,089,000 $ 4,000,371,000 $ 1,728,847,000 $ 2,848,037,000 $ 215,590,000 $ (47,685,000) $ 218,450,000 $ 163,071,000 $ 198,132,000 $ 269,000 $ 791,000 $ 659,115,000 $ 5,189,162,000 $ 3,063,627,000
Balance (in shares) at Dec. 31, 2017     253,715,190                                  
Effect of new standards     $ 0   0       (1,160,000) (1,160,000) (179,000)   0 0   0 0     (1,339,000)
Reclassification of stock-based compensation   0       8,147,000   0             0       8,147,000  
Net profit (loss) 0 0 0 0 0 0 (81,517,000) 119,710,000 (13,445,000) (13,445,000) 1,791,000 0 0 0 0 0 0 (81,517,000) 119,710,000 (11,654,000)
Other comprehensive income (loss) for the year 0   0 (91,000) 13,185,000   0   0 13,185,000 9,416,000 0 0 0   0 0 (91,000)   22,601,000
Total other comprehensive income (loss) 0   0 (91,000) 13,185,000   (81,517,000)   (13,445,000) (260,000) 11,207,000 0 0 0   0 0 (81,608,000)   10,947,000
Proceeds from sale of shares, note 14 19,471,000     0     0         28,440,000           47,911,000    
Treasury shares reduction, note 15(a) (19,711,000)     0     0         19,711,000           0    
Dividends declared and paid, note 17(d)   0 0   0 0   (200,000,000) (22,860,000) (22,860,000) (5,560,000)   0 0 0 0 0   (200,000,000) (28,420,000)
Change in investments, note 18(a)     0   0       (16,633,000) (16,633,000) 0   0 0   0 0     (16,633,000)
Stock-based compensation   0       713,000   0             0       713,000  
Expired dividends, note 17(c)     0   0       0 44,000 0   0 44,000   0 0     44,000
Acquisition of debt instruments, note 14 (19,471,000)     0     0         (22,224,000)           (41,695,000)    
Balance at Dec. 31, 2018 378,505,000 990,659,000 $ 750,497,000 (1,596,000) (703,000) 8,860,000 228,572,000 3,920,081,000 1,675,909,000 2,808,328,000 221,237,000 (21,758,000) 218,450,000 163,115,000 198,132,000 269,000 791,000 583,723,000 5,117,732,000 3,029,565,000
Balance (in shares) at Dec. 31, 2018     253,715,190                                  
As of January 1,   990,659,000 $ 750,497,000   (703,000) 8,147,000   4,000,371,000 1,674,749,000 2,807,168,000 221,058,000   218,450,000 163,115,000 198,132,000 269,000 791,000   5,197,309,000 3,028,226,000
Net profit (loss) 0 0 0 0 0 0 (95,257,000) 390,377,000 (12,208,000) (12,208,000) (16,251,000) 0 0 0 0 0 0 (95,257,000) 390,377,000 (28,459,000)
Other comprehensive income (loss) for the year 0   0 1,246,000 (608,000)   0   0 (608,000) (1,629,000) 0 0 0   0 0 1,246,000   (2,237,000)
Total other comprehensive income (loss) 0   0 1,246,000 (608,000)   (95,257,000)   (12,208,000) (12,816,000) (17,880,000) 0 0 0   0 0 (94,011,000)   (30,696,000)
Dividends declared and paid, note 17(d)   0 0   0 0   (150,000,000) (22,098,000) (22,098,000) (6,500,000)   0 0 0 0 0   (150,000,000) (28,598,000)
Change in investments, note 18(a)     0   0       (785,000) (785,000) 0   0 0   0 0     (785,000)
Stock-based compensation   0       1,214,000   0             0       1,214,000  
Expired dividends, note 17(c)     0   0       0 53,000 0   0 53,000   0 0     53,000
Balance at Dec. 31, 2019 378,505,000 990,659,000 $ 750,497,000 (350,000) (1,311,000) 10,074,000 133,315,000 4,160,458,000 1,639,658,000 2,771,522,000 196,678,000 (21,758,000) 218,450,000 163,168,000 198,132,000 269,000 791,000 489,712,000 5,359,323,000 2,968,200,000
Balance (in shares) at Dec. 31, 2019     253,715,190                                  
Net profit (loss) 0 0 $ 0 0 0 0 (165,449,000) 274,544,000 (135,718,000) (135,718,000) (14,621,000) 0 0 0 0 0 0 (165,449,000) 274,544,000 (150,339,000)
Other comprehensive income (loss) for the year 0   0 123,000 (8,215,000)   0   0 (8,215,000) (4,520,000) 0 0 0   0 0 123,000   (12,735,000)
Total other comprehensive income (loss) 0   0 123,000 (8,215,000)   (165,449,000)   (135,718,000) (143,933,000) (19,141,000) 0 0 0   0 0 (165,326,000)   (163,074,000)
Dividends declared and paid, note 17(d)     0   0       0 0 (5,140,000)   0 0   0 0     (5,140,000)
Other changes in equity     0   0       (155,000) (155,000) 0   0 0   0 0     (155,000)
Stock-based compensation   0       1,461,000   0             0       1,461,000  
Expired dividends, note 17(c)     0   0       0 26,000 0   0 26,000   0 0     26,000
Balance at Dec. 31, 2020 $ 378,505,000 $ 990,659,000 $ 750,497,000 $ (227,000) $ (9,526,000) $ 11,535,000 $ (32,134,000) $ 4,435,002,000 $ 1,503,785,000 $ 2,627,460,000 $ 172,397,000 $ (21,758,000) $ 218,450,000 $ 163,194,000 $ 198,132,000 $ 269,000 $ 791,000 $ 324,386,000 $ 5,635,328,000 $ 2,799,857,000
Balance (in shares) at Dec. 31, 2020     253,715,190                                 350,056,012