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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Segment Reporting
Long-lived Assets	$ 445,624	$ 539,150
Revenue	104,789	117,019	$ 128,175
Investment in MSC	108,326	110,183
Lease assets	800
MSC
Operating Segment Reporting
Investment in MSC	108,326	110,183	127,814
Bank of Nova Scotia | Customer
Operating Segment Reporting
Revenue	$ 33,000	$ 67,000	$ 103,600
Gold and silver sales, percentage	32.00%	64.00%	89.00%
Asahi Refining Inc. | Customer
Operating Segment Reporting
Revenue	$ 4,900	$ 123,500
Gold and silver sales, percentage	4.00%	96.00%
USA
Operating Segment Reporting
Long-lived Assets	$ 46,801	$ 135,854
Revenue	48,884	43,847
Canada
Operating Segment Reporting
Long-lived Assets	78,986	77,147
Revenue	41,452	50,058	$ 62,024
Mexico
Operating Segment Reporting
Long-lived Assets	20,021	23,551
Revenue	14,453	23,114	$ 66,151
Argentina
Operating Segment Reporting
Long-lived Assets	299,816	302,598
Argentina | MSC
Operating Segment Reporting
Investment in MSC	$ 108,300	$ 110,200

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