UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
ASSETS
Cash and cash equivalents	$ 52,657	$ 72,833
Prepaid profit sharing	9,580	0
Deposits with vendors	0	9,394
Inventories	59,890	94,608
Assets held for sale	15,359	14,159
Prepaid insurance	8,003	1,740
Other current assets	27,044	16,505
Total current assets	207,717	264,738
Property, plant and equipment, net	274,112	259,457
Intangibles, net	4,901	5,475
Mining supplies inventory	34,548	0
Deferred income taxes	21,126	14,641
Operating lease right-of-use assets	8,469	9,661
Equity securities	18,109	18,663
Other non-current assets	31,025	25,768
Total assets	637,633	631,687
LIABILITIES AND EQUITY
Current maturities of long-term debt	4,644	4,179
Asset retirement obligations	9,595	9,747
Accrued payroll	17,810	22,663
Excess funding liability	5,450	0
Other current liabilities	9,022	8,752
Total current liabilities	67,892	64,888
Long-term debt	25,518	25,335
Long-term revolving credit agreements	50,000	70,000
Operating lease liabilities	7,687	9,042
Asset retirement obligations	38,707	39,780
Pension and other postretirement obligations	4,483	4,787
Other long-term liabilities	16,944	12,908
Total liabilities	211,231	226,740
Common stock:
Capital in excess of par value	40,016	34,340
Retained earnings	388,652	373,363
Accumulated other comprehensive loss	(9,726)	(10,052)
Total stockholders' equity	426,402	404,947
Total liabilities and equity	637,633	631,687
Unconsolidated Subsidiaries
ASSETS
Investments in unconsolidated subsidiaries	18,560	14,137
Equity method investment in Eiger Resources	18,560	14,137
Eiger, LLC
ASSETS
Investments in unconsolidated subsidiaries	19,066	19,147
Equity method investment in Eiger Resources	19,066	19,147
Nonrelated Party
ASSETS
Trade accounts receivable and accounts receivable from affiliates	30,889	49,706
LIABILITIES AND EQUITY
Accounts payable and accounts payable to affiliates	20,447	17,721
Affiliated Entity
ASSETS
Trade accounts receivable and accounts receivable from affiliates	4,295	5,793
LIABILITIES AND EQUITY
Accounts payable and accounts payable to affiliates	924	1,826
Class A Common Stock
Common stock:
Common stock	5,896	5,730
Class B Common Stock
Common stock:
Common stock	$ 1,564	$ 1,566