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Cost of Sales (Schedule of Cost of Sales) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items] |  |
Direct mining costs | $ 93,663 | $ 78,621
Salaries and benefits | 11,299 | 10,096
Workers' Participation | 7,350 | 5,715
Depletion and depreciation | 42,104 | 32,717
Royalties | 4,135 | 2,500
Cost of sales | 158,551 | 129,649
Caylloma M&I Property [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Direct mining costs | 35,476 | 32,047
Salaries and benefits | 6,013 | 5,399
Workers' Participation | 1,545 | 973
Depletion and depreciation | 9,175 | 7,958
Royalties | 1,283 | 873
Cost of sales | 53,492 | 47,250
San Jose M&I Property [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Direct mining costs | 58,187 | 46,574
Salaries and benefits | 5,286 | 4,697
Workers' Participation | 5,805 | 4,742
Depletion and depreciation | 32,929 | 24,759
Royalties | 2,852 | 1,627
Cost of sales | $ 105,059 | $ 82,399

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_103&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of expense arising from royalties. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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