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Commitments and contingencies (Details 3) - Minera Yanacocha SRL and subsidiary [member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Letters of guarantee outstanding, amount |  | $ 503,729 | $ 428,000
BBVA Continental [member] |  |  |
Letters of guarantee outstanding, amount |  | 190,000 | 120,000
Banco de Credito del Peru [member] |  |  |
Letters of guarantee outstanding, amount | [1] | 123,729 | 188,000
Scotiabank [member] |  |  |
Letters of guarantee outstanding, amount |  | $ 190,000 | $ 120,000
[1] | Letters of guarantee of Banco de Credito del Peru include US$6,321,000 and US$7,626,000 related to San Jose Reservoir Trust in 2017 and 2016, respectively.

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- Definition The outstanding amount of letters of credit showed by the entity in accordance with the Mine Closure Regulation. + References No definition available. + Details
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- Details
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