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Summary of significant differences between accounting principles followed by the Company and U.S. Generally Accepted Accounting Principles (Details textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Summary of significant differences between accounting principles followed by the Company and U.S. Generally Accepted Accounting Principles [Line Items] |  |  |
Impairment loss |  | $ 21,620 | $ 0
Recognition of Provisions Terms | For the purposes of IAS 37, “probable” is defined as more likely than not and refers to a probability of greater than 50%. |  |
Bottom of range [member] |  |  |
Disclosure of Summary of significant differences between accounting principles followed by the Company and U.S. Generally Accepted Accounting Principles [Line Items] |  |  |
Percentage of Events Likely To Occur | 70.00% |  |
Top of range [member] |  |  |
Disclosure of Summary of significant differences between accounting principles followed by the Company and U.S. Generally Accepted Accounting Principles [Line Items] |  |  |
Percentage of Events Likely To Occur | 80.00% |  |
Yanacocha mine [Member] |  |  |
Disclosure of Summary of significant differences between accounting principles followed by the Company and U.S. Generally Accepted Accounting Principles [Line Items] |  |  |
Impairment loss |  |  | 889,000
Yanacocha mine [Member] | US GAAP [Member] |  |  |
Disclosure of Summary of significant differences between accounting principles followed by the Company and U.S. Generally Accepted Accounting Principles [Line Items] |  |  |
Impairment loss |  |  | $ 973,000

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