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Revenue from sales (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue from sale of gold | $ 411,926 | $ 511,434 | $ 440,603
Royalty expense | (21,526) | (31,217) | (27,611)
Revenue from sale of goods | 1,122,995 | 1,223,942 | 1,015,670
America [member] |  |  |
Revenue from sale of goods | 370,624 | 471,863 | 397,795
Minera Yanacocha SRL and subsidiary [member] |  |  |
Revenue from sale of gold | 658,653 | 670,905 | 791,766
Revenue from sale of goods | 635,393 | 645,176 | 761,193
Minera Yanacocha SRL and subsidiary [member] | Peruvian government [member] |  |  |
Royalty expense | (2,875) | (4,990) | (6,234)
Minera Yanacocha SRL and subsidiary [member] | S.M.R.L. Chaupiloma Dos de Cajamarca [member] |  |  |
Royalty expense | (20,385) | (20,739) | (24,339)
Minera Yanacocha SRL and subsidiary [member] | America [member] |  |  |
Revenue from sale of gold | 139,989 | 179,018 | 233,043
Minera Yanacocha SRL and subsidiary [member] | Switzerland [Member] |  |  |
Revenue from sale of gold | $ 518,664 | $ 491,887 | $ 558,723

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