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MARKETABLE SECURITIES | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Detailed Information About Marketable Securities [Abstract] |
MARKETABLE SECURITIES | MARKETABLE SECURITIES
| December 31, 2020 | December 31, 2019
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 |
Purchases and sales of marketable securities are accounted for as of the trade date. During the year ended December 31 2020, the Company sold 100% of its equity position in SilverCrest Metals Inc. and other securities for gross proceeds of $97.1 million, being the fair value of the investments at the dates of disposals. On disposal, the cumulative gain recognized in AOCI was $38.0 million (pre-tax).

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