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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, 2018 | Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items] |  |
Direct mining costs | $ 99,648 | $ 93,663
Salaries and benefits | 13,192 | 11,299
Workers' Participation | 6,164 | 7,350
Depletion and depreciation | 44,473 | 42,104
Royalties | 3,248 | 4,135
Cost of sales | 166,725 | 158,551
Caylloma M&I Property [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Direct mining costs | 38,788 | 35,476
Salaries and benefits | 7,303 | 6,013
Workers' Participation | 1,726 | 1,545
Depletion and depreciation | 12,222 | 9,175
Royalties | 218 | 1,283
Cost of sales | 60,257 | 53,492
San Jose M&I Property [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Direct mining costs | 60,860 | 58,187
Salaries and benefits | 5,889 | 5,286
Workers' Participation | 4,438 | 5,805
Depletion and depreciation | 32,251 | 32,929
Royalties | 3,030 | 2,852
Cost of sales | $ 106,468 | $ 105,059

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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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