INVESTMENTS - Activity in Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments rollforward
Opening balance	$ 1,295	$ 1,806
Additions/transfers during the period	34,157		$ 1,778
Disposals/transfers during period	(162)
Unrealized gain on securities held	20,542	(511)	28
Foreign exchange loss on securities held	(9,858)
McEwen Copper deconsolidation	(44,231)
Ending balance	1,743	1,295	1,806
Marketable equity securities
Investments rollforward
Opening balance	1,133	1,644
Additions/transfers during the period	34,157		1,616
Unrealized gain on securities held	20,542	(511)	28
Foreign exchange loss on securities held	(9,858)
McEwen Copper deconsolidation	(44,231)
Ending balance	1,743	1,133	1,644
Warrants
Investments rollforward
Opening balance	162	162
Additions/transfers during the period			162
Disposals/transfers during period	$ (162)
Ending balance		$ 162	$ 162