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Investments (Tables) | 3 Months Ended
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Mar. 31, 2021
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, 2021
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Integra Resources Corp. | $ | 7,500 |  |  | $ | — |  |  | $ | 707 |  |  | $ | 8,207 |
Other | 2 |  |  | — |  |  | — |  |  | 2 |
Equity securities | $ | 7,502 |  |  | $ | — |  |  | $ | 707 |  |  | $ | 8,209 |
| At December 31, 2020
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 166 |  |  | $ | — |  |  | $ | 875 |  |  | $ | 1,041 |
Integra Resources Corp. | 7,500 |  |  | — |  |  | 4,401 |  |  | 11,901 |
Other | 2 |  |  | (1) |  |  | — |  |  | 1 |
Equity securities | $ | 7,668 |  |  | $ | (1) |  |  | $ | 5,276 |  |  | $ | 12,943 |

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