OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Operating Segment Reporting
Long-lived Assets	$ 448,326		$ 448,326		$ 440,315
Revenue	30,647	$ 40,706	56,189	$ 64,446
Investment in MSC	92,066		92,066		90,961
Total which excludes Company's ROU office lease asset	400		400
Minera Santa Cruz S.A.
Operating Segment Reporting
Revenue	70,827	70,396	111,530	123,699
Investment in MSC	92,066		92,066		90,961	$ 108,326
UNITED STATES
Operating Segment Reporting
Long-lived Assets	38,600		38,600		37,877
Revenue	9,996	26,343	21,739	39,236
Canada
Operating Segment Reporting
Long-lived Assets	99,185		99,185		93,294
Revenue	20,246	12,178	33,141	20,739
MEXICO
Operating Segment Reporting
Long-lived Assets	26,558		26,558		26,561
Revenue	405	$ 2,185	1,309	$ 4,471
ARGENTINA
Operating Segment Reporting
Long-lived Assets	283,983		283,983		282,583
ARGENTINA | Minera Santa Cruz S.A.
Operating Segment Reporting
Investment in MSC	$ 92,100		$ 92,100		$ 90,900