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Mineral Properties

6 Months Ended

Jun. 30, 2025

2. Mineral Properties

The following table details Solitario’s capitalized mineral properties:

(in thousands)	June 30,		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
Total exploration mineral properties	$	16,701	$	16,701

Solitario’s mineral properties at June 30, 2025 and December 31, 2024 consist of use rights related to its exploration properties. The amounts capitalized as mineral properties include initial concession and lease or option acquisition costs. None of Solitario’s exploration properties have production (are operating) or have established proven or probable reserves. Solitario’s mineral properties represent interests in properties that Solitario believes have exploration and development potential.

Exploration expense

The following items comprised exploration expense:

(in thousands)	Three months ended June 30,				Six months ended June 30,
	2025		2024		2025		2024
Geologic and field expenses	$	620	$	394	$	782	$	651
Administrative		51		93		128		190
Total exploration costs	$	671	$	487	$	910	$	841

Asset Retirement Obligation and Reclamation Liabilities

Solitario recorded an asset retirement obligation of $125,000 upon the acquisition of the Lik Project 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 Solitario and its joint venture partner, Teck, and is supported by a permitting bond required by the State of Alaska, for which Solitario has retained a reclamation bond insurance policy in the event Solitario or 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 completion of reclamation is not expected to occur until the end of the related 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.

As of June 30, 2025 and December 31, 2024, Solitario has no reclamation liability at its Florida Canyon Project as Nexa is responsible for the costs at the Florida Canyon Project, including reclamation, if any. In addition, the activities to date at Solitario’s Cat Creek Project of staking claims and mapping, soil and rock sampling, and assaying have not created any material environmental or other disturbances.

Solitario is also involved in certain matters concerning its 2025 and 2024 drilling programs remediation at its Golden Crest Project. Generally, the bulk of remediation at the Golden Crest Project associated with its 2025 and 2024 drilling programs are carried out concurrently with drilling activities, with only ongoing contouring and reseeding of drill sites remaining as of June 30, 2025 related to the 2024 drilling program. As the 2025 drilling program was initiated in June 2025, there have not been any material on-going (non-concurrent) reclamation liabilities related to the 2025 drilling program as of June 30, 2025. At June 30, 2025 and December 31, 2024, Solitario has a reclamation liability of $20,000, included in asset retirement and reclamation liabilities related to the Golden Crest Project.