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Revenue from sales (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue from sale of gold | $ 511,434 | $ 440,603 | $ 419,541
Royalty expense | (31,217) | (27,611) | 27,188
Revenue from sale of goods | 1,223,942 | 1,015,670 | 846,269
America [member] |  |  |
Revenue from sale of goods | 464,000 | 410,154 | 419,359
Minera Yanacocha SRL and subsidiary [member] |  |  |
Revenue from sale of gold | 670,905 | 791,766 | 1,070,021
Revenue from sale of goods | 645,176 | 761,193 | 1,031,174
Minera Yanacocha SRL and subsidiary [member] | Peruvian government [member] |  |  |
Royalty expense | (4,990) | (6,234) | (6,433)
Minera Yanacocha SRL and subsidiary [member] | S.M.R.L. Chaupiloma Dos de Cajamarca [member] |  |  |
Royalty expense | (20,739) | (24,339) | (32,414)
Minera Yanacocha SRL and subsidiary [member] | Suiza [member] |  |  |
Revenue from sale of gold | 491,887 | 558,723 | 754,335
Minera Yanacocha SRL and subsidiary [member] | America [member] |  |  |
Revenue from sale of gold | $ 179,018 | $ 233,043 | $ 315,686

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