v3.25.4

Mineral Property (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2025
Mineral Properties |
Investment in mineral property |
(in thousands) |  | December 31, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
Exploration |  |  |  |  |  |
Lik Project (Alaska – US) |  | $ | 15,611 |  |  | $ | 15,611 |
Golden Crest Project (South Dakota – US) |  |  | 1,078 |  |  |  | 1,078 |
Cat Creek Project (Colorado – US) |  |  | 12 |  |  |  | 12 |
Bright Angel Project (Colorado – US) |  |  | 31 |  |  |  | - |
Total exploration mineral properties |  | $ | 16,732 |  |  | $ | 16,701 |
Exploration expense |
|  | For the year ended December 31, |
(in thousands) |  | 2025 |  |  | 2024 |
Geologic and field expenses |  | $ | 2,600 |  |  | $ | 3,939 |
Administrative |  |  | 247 |  |  |  | 209 |
Total exploration expense |  | $ | 2,847 |  |  | $ | 4,148 |

X
- References No definition available. + Details
Name: | srt_ExtractiveIndustriesAbstract
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
Name: | us-gaap_PropertyPlantAndEquipmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | xpl_MineralPropertyExplorationExpenseTableTextBlock
Namespace Prefix: | xpl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration