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MINERAL PROPERTY INTERESTS AND PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |
Subtotal | $ 482,153 | $ 459,006
Less: accumulated depreciation | (57,316) | (35,127)
Net carrying value | 424,837 | 423,879
Mineral property interests |  |
Property, Plant and Equipment [Line Items] |  |
Subtotal | 338,085 | 326,086
Land |  |
Property, Plant and Equipment [Line Items] |  |
Subtotal | 8,745 | 8,699
Construction in process |  |
Property, Plant and Equipment [Line Items] |  |
Subtotal | 3,520 | 74,643
Plant and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Subtotal | 131,803 | 49,578
Operating Leases |  |
Property, Plant and Equipment [Line Items] |  |
Subtotal | 1,167 |
Less: accumulated depreciation | (441) |
Net carrying value | 726 |
Finance Leases |  |
Property, Plant and Equipment [Line Items] |  |
Subtotal | 8,048 |
Less: accumulated depreciation | (864) |
Net carrying value | 7,184 |
Gold Bar mine | Construction in process |  |
Interest expense |  |
Interest Expense, Debt | $ 1,400 | $ 800

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