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Mineral Properties, Plant and Equipment - Additional Information (Details) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 18, 2018 | Jan. 31, 2018 | Jul. 11, 2016 | May 08, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Additions |  |  |  |  | $ 148,102 | $ 200,837
Transfers to mineral reserves |  |  |  |  | 38,100 | 78,300
Gain on sale of assets, after taxes |  |  | $ 600 |  |  |
Reversals of impairment |  |  |  |  | 61,554 | 0
Dolores mine [member] | Mining assets [member] | Gross carrying amount [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Additions |  |  |  |  | 88,500 | 106,600
La Colorada mine [member] | Mining assets [member] | Gross carrying amount [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Additions |  |  |  |  | 20,300 | 52,900
Calcatreu project [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Reversals of impairment |  |  |  |  | 1,317 | 0
Deferred Stripping Costs [member] | Dolores mine [member] | Mining assets [member] | Gross carrying amount [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Additions |  |  |  |  | 19,700 | 18,500
Pulp Agglomeration Construction Costs [member] | Dolores mine [member] | Mining assets [member] | Gross carrying amount [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Additions |  |  |  |  | 20,500 | 40,500
Underground Development Costs [member] | Dolores mine [member] | Mining assets [member] | Gross carrying amount [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Additions |  |  |  |  | 28,400 | 17,200
Underground Development Costs [member] | La Colorada mine [member] | Mining assets [member] | Gross carrying amount [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Additions |  |  |  |  | 1,800 | 2,900
Powerline Construction Costs [member] | Dolores mine [member] | Mining assets [member] | Gross carrying amount [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Additions |  |  |  |  |  | 6,800
Powerline Construction Costs [member] | La Colorada mine [member] | Mining assets [member] | Gross carrying amount [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Additions |  |  |  |  | 3,400 | 6,100
Pad 3 Construction Additions [member] | Dolores mine [member] | Mining assets [member] | Gross carrying amount [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Additions |  |  |  |  | $ 1,000 | 1,600
Shaft Construction Costs [member] | La Colorada mine [member] | Mining assets [member] | Gross carrying amount [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Additions |  |  |  |  |  | 19,300
Sulfide Plant Construction Costs [member] | La Colorada mine [member] | Mining assets [member] | Gross carrying amount [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Additions |  |  |  |  |  | $ 12,800
Shalipayco S.A.C. [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Gains on disposals of investments |  |  |  | $ 18,300 |  |
Proportion of ownership interest in associate sold |  |  |  | 75.00% |  |
Proceeds from sales of investments in stock |  |  |  | $ 15,000 |  |
Net smelter returns royalty receivable (percent) |  |  |  | 1.00% |  |
Proceeds from sales of investment property |  |  |  | $ 3,300 |  |
Gain on sale of assets, before tax |  |  | $ (6,600) |  |  |
Other disposals of assets [member] | Minera Aquiline Argentina SA [Member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Percent of shares of Minera Aquiline Argentina SA sold (percent) |  | 100.00% |  |  |  |
Consideration for held-for-sale assets sold |  | $ 15,000 |  |  |  |
Proceeds from disposal of non-current assets or disposal groups classified as held for sale and discontinued operations | $ 10,000 | $ 5,000 |  |  |  |

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