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Other Investments | 12 Months Ended
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Dec. 31, 2020
Other Investments |
Short-term and Other Investments | 3. Other Investments ​ Short-term investments ​ As of December 31, 2020 and 2019, the amortized cost basis of our short-term investments was $400 and $3,260, respectively. The amortized cost basis approximates fair value at December 31, 2020 and 2019. Short-term investments at December 31, 2020 and 2019 are comprised of U.S. Government treasury bills and/or notes, all of which have maturity dates greater than 90 days but less than one year. ​ Other investments ​ Investments in marketable securities are recorded at fair value in the Consolidated Balance Sheets. Subsequent changes in fair value are recorded in the Consolidated Statements of Income/(Loss) in the period in which they occur. During the year ended December 31, 2019, the Company sold 920,500 common shares of Midas Gold Corp. (“Midas Gold Shares”) for net proceeds of $413 at a loss of $2 compared to the most recent measurement period. Cumulative realized loss since acquisition of these Midas Gold Shares was $1,975, of which $1,973 was recognized in previous periods as unrealized loss, net. We held 6,882,115 shares of Midas Gold at December 31, 2019. During the year ended December 31, 2020, the Company sold all of its remaining Midas Gold Shares for net proceeds of $5,788 at a gain of $2,574 compared to the most recent measurement periods. Cumulative realized loss since acquisition of the Midas Gold Shares in April 2011 was $11,841, of which $14,415 was recognized in previous periods as unrealized loss, net. The Company held 1,333,334 shares of Nusantara Resources Limited (“Nusantara Resources”) as of December 31, 2020 and December 31, 2019. ​ The following table summarizes our investments in marketable securities as of December 31, 2020 and 2019. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2020 |  | December 31, 2019 | ​
Fair value at beginning of period | ​ | $ | 3,676 | ​ | $ | 5,462 | ​
Midas Gold Shares sold | ​ | ​ | (5,788) | ​ | ​ | (415) | ​
Nusantara Resources shares | ​ | ​ | — | ​ | ​ | 272 | ​
Unrealized gain/(loss) | ​ | ​ | 2,405 | ​ | ​ | (1,643) | ​
Fair value at end of period | ​ | $ | 293 | ​ | $ | 3,676 | ​
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