NOTE 6—ACCRUED LIABILITIES AND OTHER LONG-TERM LIABILITIES

Accrued liabilities consisted of the following:

Self-Insurance—The Company is self-insured for certain losses relating to workers’ compensation claims and occupational disease obligations under the Federal Mine Safety and Health Act of 1969, as amended, as well as for employee medical expenses. The Company purchases insurance coverage to reduce its exposure to significant levels of these claims. Self-insured losses are accrued based upon estimates of the aggregate liability for uninsured claims incurred as of the balance sheet date using claims data and actuarial assumptions and, therefore, are subject to uncertainty due to a variety of factors.

The estimated aggregate liability for these items totaled $8.6 million and $8.3 million as of September 30, 2025 and December 31, 2024, respectively. Of the aggregate liability, the amounts included in Other long-term liabilities were $6.3 million and $5.2 million at September 30, 2025 and December 31, 2024, respectively.

Funds held in escrow for potential future workers’ compensation claims are considered restricted cash and have been included in prepaid expenses and other on the condensed consolidated balance sheets. Restricted cash balances were $0.8 million at September 30, 2025 and December 31, 2024.