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Supplemental Financial Information (Tables)

6 Months Ended

Jun. 30, 2025

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of Other Long Term Assets

The following table summarizes the components of Prepaid expenses and other current assets and Other long-term assets, net as presented in the Condensed Consolidated Balance Sheets:

						As of
(in thousands)						June 30, 2025						December 31, 2024
Prepaid expenses and other current assets:
Prepaid expenses						$	4,309					$	2,021
Prepaid lender fees, net (1)						1,571						982
Prepaid income taxes and income tax refunds						159						233
Other						1,343						1,414
Total prepaid expenses and other current assets						$	7,382					$	4,650
Other long-term assets, net:
Spare parts, net						$	11,678					$	11,178
Right of use assets, operating leases, net						9,516						9,312
Intangible assets, net						7,376						7,569
Mine development costs, net						6,851						7,010
Upfront Customer Consideration (2)						5,205						5,459
Mine reclamation asset, net						1,562						1,620
Other						2,601						2,581
Total other long-term assets, net						$	44,789					$	44,729

(1) Represents legal and administrative costs incurred to obtain the Revolving Credit Facility. This asset is being amortized on a straight-line basis over the five-year contractual period of the Revolving Credit Facility.

(2) Represents remaining balance on consideration paid to a customer under a long-term supply contract executed in 2020. This asset is being amortized as a reduction to revenue on a straight-line basis over the expected 15-year contractual period of the contract.

Schedule of Other Liabilities

The following table details the components of Other current liabilities and Other long-term liabilities as presented in the Condensed Consolidated Balance Sheets:

						As of
(in thousands)						June 30, 2025						December 31, 2024
Other current liabilities:
Current portion of operating lease obligations						$	2,560					$	2,081
Sales, use and other taxes payable						1,485						2,325
Current portion of mine reclamation liability						1,037						1,037
Other (1)						5,268						2,741
Total other current liabilities						$	10,350					$	8,184
Other long-term liabilities:
Operating lease obligations, long-term						$	7,186					$	7,460
Mine reclamation liabilities						5,413						5,242
Other						265						367
Total other long-term liabilities						$	12,864					$	13,069

(1) Included in Other current liabilities as of June 30, 2025 and December 31, 2024 is $1.7 million for the Tinuum Group Obligation as discussed in Note 6.

Schedule of Change in Asset Retirement Obligation

The Mine reclamation liabilities represent AROs. Changes in the AROs were as follows:

						As of
(in thousands)						June 30, 2025						December 31, 2024
Asset retirement obligations, beginning of period						$	6,279					$	6,163
Accretion						254						666
Liabilities settled						(83)						(77)
Changes due to scope and timing of reclamation						—						(473)
Asset retirement obligations, end of period						6,450						6,279
Less current portion						1,037						1,037
Asset retirement obligations, long-term						$	5,413					$	5,242

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- Definition

Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs.

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Tabular disclosure of other liabilities.

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- Definition

Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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