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PLANT AND EQUIPMENT, MINE DEVELOPMENT AND CONSTRUCTION IN PROGRESS - Construction-in-progress (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Construction in progress |  |
Construction-in-progress | $ 8,178 | $ 2,812
Gold Bar project |  |
Construction in progress |  |
Construction-in-progress | 6,011 |
Black Fox |  |
Construction in progress |  |
Construction-in-progress | 67 |
El Gallo 2 project |  |
Construction in progress |  |
Construction-in-progress | $ 2,100 | $ 2,812

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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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