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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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