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Demonstration Plant (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Demonstration plant |  |
Plant operating expense | $ 855 | $ 1,466
Personnel |  |
Demonstration plant |  |
Plant operating expense | 645 | 1,013
Reagents |  |
Demonstration plant |  |
Plant operating expense | 22 | 13
Repairs and maintenance |  |
Demonstration plant |  |
Plant operating expense | 31 | 10
Supplies |  |
Demonstration plant |  |
Plant operating expense | 98 | 292
Testwork |  |
Demonstration plant |  |
Plant operating expense | 3 | 102
Office trailer rental |  |
Demonstration plant |  |
Plant operating expense | 7 | 17
Other |  |
Demonstration plant |  |
Plant operating expense | $ 49 | $ 19

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