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INVESTMENTS - Activity in Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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