Short-term and Other Investments	6 Months Ended
Jun. 30, 2021
Short-term and Other Investments
Short-term and Other Investments	3. Short-term and Other Investments Short-term investments As of June 30, 2021 and December 31, 2020, the amortized cost basis of our short-term investments was $nil and $400, respectively, which approximated fair value. Short-term investments at December 31, 2020 were comprised of U.S. government treasury securities and certificates of deposit, which had maturity dates on the date of purchase greater than 90 days but less than one year. Investments with maturity dates of 90 days or less were included in cash and cash equivalents. Other investments The Company’s investment in 1,333,334 common shares of Nusantara Resources Limited shares (“Nusantara Shares”) was recorded at fair value in the Unaudited Condensed Consolidated Balance Sheet at June 30, 2021 and December 31, 2020. Vista also held common shares of Midas Gold Corp. (“Midas Gold Shares”) during a portion of 2020; all Midas Gold Shares were sold prior to 2021. The fair value of other investments was $340 and $293 at June 30, 2021 and December 31, 2020, respectively. Changes in fair value of the Nusantara Shares and Midas Gold Shares, representing unrealized gains (losses), were recorded in the Unaudited Condensed Consolidated Statements of Income/(Loss) in the period in which the changes occurred. No other investments were sold during the three and six months ended June 30, 2021. Realized gains were recorded upon sale of other investments. During the three months ended June 30, 2020, the Company sold 1,572,500 Midas Gold Shares for net proceeds of $654, at a gain of $135 based on the most recent measurement period of March 31, 2020. During the six months ended June 30, 2020, the Company sold 2,214,500 Midas Gold Shares for net proceeds of $954, at a gain of $120 based on the most recent measurement periods of March 31, 2020 and December 31, 2019.

Short-term and Other Investments

6 Months Ended

Jun. 30, 2021

3. Short-term and Other Investments

Short-term investments

As of June 30, 2021 and December 31, 2020, the amortized cost basis of our short-term investments was $nil and $400, respectively, which approximated fair value. Short-term investments at December 31, 2020 were comprised of U.S. government treasury securities and certificates of deposit, which had maturity dates on the date of purchase greater than 90 days but less than one year. Investments with maturity dates of 90 days or less were included in cash and cash equivalents.

Other investments

The Company’s investment in 1,333,334 common shares of Nusantara Resources Limited shares (“Nusantara Shares”) was recorded at fair value in the Unaudited Condensed Consolidated Balance Sheet at June 30, 2021 and December 31, 2020. Vista also held common shares of Midas Gold Corp. (“Midas Gold Shares”) during a portion of 2020; all Midas Gold Shares were sold prior to 2021. The fair value of other investments was $340 and $293 at June 30, 2021 and December 31, 2020, respectively.

Changes in fair value of the Nusantara Shares and Midas Gold Shares, representing unrealized gains (losses), were recorded in the Unaudited Condensed Consolidated Statements of Income/(Loss) in the period in which the changes occurred. No other investments were sold during the three and six months ended June 30, 2021. Realized gains were recorded upon sale

of other investments. During the three months ended June 30, 2020, the Company sold 1,572,500 Midas Gold Shares for net proceeds of $654, at a gain of $135 based on the most recent measurement period of March 31, 2020. During the six months ended June 30, 2020, the Company sold 2,214,500 Midas Gold Shares for net proceeds of $954, at a gain of $120 based on the most recent measurement periods of March 31, 2020 and December 31, 2019.