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Investments (Tables) | 3 Months Ended
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Mar. 31, 2020
Investment in Marketable Securities [Abstract] |
Investments | The Company makes strategic investments in equity and debt securities of silver and gold exploration, development and royalty and streaming companies.
| At March 31, 2020
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 10,463 |  |  | $ | — |  |  | $ | 11,546 |  |  | $ | 22,009 |
Integra Resources Corp. | 5,000 |  |  | (1,463 | ) |  | — |  |  | 3,537 |
Rockhaven Resources Ltd. | 2,064 |  |  | (1,101 | ) |  | — |  |  | 963 |
Other | 1,304 |  |  | (987 | ) |  | — |  |  | 317 |
Equity securities | $ | 18,831 |  |  | $ | (3,551 | ) |  | $ | 11,546 |  |  | $ | 26,826 |
| At December 31, 2019
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 10,463 |  |  | $ | — |  |  | $ | 17,725 |  |  | $ | 28,188 |
Integra Resources Corp. | 5,000 |  |  | — |  |  | 355 |  |  | $ | 5,355 |
Rockhaven Resources, Ltd. | 2,064 |  |  | (376 | ) |  | — |  |  | 1,688 |
Other | 1,304 |  |  | (889 | ) |  | — |  |  | 415 |
Equity securities | $ | 18,831 |  |  | $ | (1,265 | ) |  | $ | 18,080 |  |  | $ | 35,646 |

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