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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, 2019 | Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items] |  |
Direct mining costs | $ 101,734 | $ 99,648
Salaries and benefits | 15,040 | 13,192
Workers' Participation | 6,011 | 6,164
Depletion and depreciation | 44,358 | 44,473
Royalties | 4,135 | 3,248
Impairment of inventories | 1,328 |
Cost of sales | 172,606 | 166,725
Depletion and depreciation, right-of-use | 2,262 | 0
Caylloma M&I Property [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Direct mining costs | 35,712 | 38,788
Salaries and benefits | 7,557 | 7,303
Workers' Participation | 717 | 1,726
Depletion and depreciation | 13,621 | 12,222
Royalties | 750 | 218
Impairment of inventories | 93 |
Cost of sales | 58,450 | 60,257
San Jose M&I Property [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Direct mining costs | 66,022 | 60,860
Salaries and benefits | 7,483 | 5,889
Workers' Participation | 5,294 | 4,438
Depletion and depreciation | 30,737 | 32,251
Royalties | 3,385 | 3,030
Impairment of inventories | 1,235 |
Cost of sales | $ 114,156 | $ 106,468

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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 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_103&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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