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MARKETABLE SECURITIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Investments [Line Items] |  |  |
Net proceeds from sales of marketable securities | $ (97,098) | $ (3,308) | [1]
Marketable Securities [Roll Forward] |  |  |
Balance, beginning of year | 66,453 | 29,542 |
Additions | 35,132 | 6,112 |
Disposals | (97,098) | (3,534) |
Fair value adjustments | 22,261 | 34,333 |
Balance, end of year | $ 26,748 | $ 66,453 |
SilverCrest Metal Inc. |  |  |
Investments [Line Items] |  |  |
Percentage of voting equity interests sold | 100.00% |  |
Net proceeds from sales of marketable securities | $ (97,100) |  |
Gains on disposals of investments | $ 38,000 |  |
[1] | See note 2(r)

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