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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Current assets:    
Cash and cash equivalents $ 12,663 $ 7,232
Restricted cash 22,819 4,921
Accounts receivable 24,763 15,438
Inventory 28,006 36,685
Parts and supplies 44,002 39,104
Prepaid expenses 4,293 1,478
Total current assets 136,546 104,858
Property, plant and equipment:    
Land and mineral rights 69,961 70,307
Buildings and equipment 454,040 429,857
Mine development 99,852 92,458
Finance lease right-of-use assets 13,034 13,034
Total property, plant and equipment 636,887 605,656
Less - accumulated depreciation, depletion and amortization (370,903) (347,952)
Total property, plant and equipment, net 265,984 257,704
Equity method investments 2,713 2,607
Other assets 4,218 3,951
Total assets 409,461 369,120
Current liabilities:    
Current portion of bank debt, net 42,698 4,095
Accounts payable and accrued liabilities 44,010 44,298
Current portion of lease financing 7,395 6,912
Contract liabilities - current 113,244 97,598
Total current liabilities 207,347 152,903
Long-term liabilities:    
Bank debt, net   37,394
Long-term lease financing 3,140 8,749
Asset retirement obligations 16,268 14,957
Contract liabilities - long-term 34,362 49,121
Other 2,156 1,711
Total long-term liabilities 55,926 111,932
Total liabilities 263,273 264,835
Commitments and contingencies (Note 16)
Stockholders' equity:    
Preferred stock, $.10 par value, 10,000 shares authorized; none issued
Common stock, $.01 par value, 100,000 shares authorized; 42,978 and 42,621 issued and outstanding, as of September 30, 2025 and December 31, 2024, respectively 430 426
Additional paid-in capital 189,086 189,298
Retained deficit (43,328) (85,439)
Total stockholders' equity 146,188 104,285
Total liabilities and stockholders' equity $ 409,461 $ 369,120