Note 10 - Self-Insurance

3 Months Ended

Mar. 31, 2023

Notes to Financial Statements

Self Insurance [Text Block]

(10) SELF-INSURANCE

We self-insure our underground mining equipment. Such equipment is allocated among seven mining units dispersed over ten miles. The historical cost of such equipment was approximately $285 million and $280 million as of March 31, 2023, and December 31, 2022, respectively.

Restricted cash of $3.9 million and $3.4 million as of March 31, 2023, and December 31, 2022, respectively, represents cash held and controlled by a third party and is restricted for future workers’ compensation claim payments and cash collateral to provide power in the MISO grid.