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Mineral Properties | 6 Months Ended
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Jun. 30, 2023
Mineral Properties |
Mineral Properties | 2. Mineral Properties The following table details Solitario’s investment in Mineral Properties:
(in thousands) |  | June 30, |  |  | December 31, |
|  | 2023 |  |  | 2022 |
Exploration |  |  |  |  |  |
Lik project (Alaska – US) |  | $ | 15,611 |  |  | $ | 15,611 |
Golden Crest (South Dakota – US) |  |  | 1,035 |  |  |  | 1,035 |
Total exploration mineral properties |  | $ | 16,646 |  |  | $ | 16,646 |
All exploration costs on our exploration properties, none of which have proven and probable reserves, including any additional costs incurred for subsequent lease payments or exploration activities related to our projects, are expensed as incurred. During the three and six months ended June 30, 2023, Solitario advanced $350,000 to Teck for planned 2023 exploration expenditures at the Lik project, of which $332,000 was in prepaid expenses at June 30, 2023. Exploration expense The following items comprised exploration expense:
(in thousands) |  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Geologic and field expenses |  | $ | 503 |  |  | $ | 814 |  |  | $ | 735 |  |  | $ | 1,008 |
Administrative |  |  | 52 |  |  |  | 137 |  |  |  | 95 |  |  |  | 169 |
Total exploration costs |  | $ | 555 |  |  | $ | 951 |  |  | $ | 830 |  |  | $ | 1,177 |
Asset Retirement Obligation In connection with the acquisition of its interest in the Lik project in 2017, Solitario recorded an asset retirement obligation of $125,000 for Solitario’s estimated reclamation cost of the existing disturbance at the Lik project. This disturbance consists of an exploration camp including certain drill sites and access roads at the camp. The estimate was based upon estimated cash costs for reclamation as determined by the permitting bond required by the State of Alaska for which Solitario has purchased a reclamation bond insurance policy in the event Solitario or its 50% partner, Teck, do not complete required reclamation. Solitario has not applied a discount rate to the recorded asset retirement obligation as the estimated time frame for reclamation is not currently known, as reclamation is not expected to occur until the end of the Lik project life, which would follow future development and operations, the start of which cannot be estimated or assured at this time. Additionally, no depreciation will be recorded on the related asset for the asset retirement obligation until the Lik project goes into operation, which cannot be assured.

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