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v3.23.1

Identifiable net assets (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 699,599 | $ 701,084
Cash | 173,884 | 178,294
Asset Management [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 39,202 | 26,053
Mining Properties [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 48,501 | 48,494
Development [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 181,592 | 188,834
Stabilized Joint Venture [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 254,932 | 257,535
Unallocated Corporate Assets [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 1,488 | $ 1,874

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