Self-Insurance

6 Months Ended

Jun. 30, 2017

Self-Insurance [Abstract]

Self-Insurance

(5)Self-Insurance

We self-insure our underground mining equipment.  Such equipment is allocated among ten mining units spread out over 18 miles.  The historical cost of such equipment is approximately $253 million.

Restricted cash of $3.3 million represents cash held and controlled by a third party and is restricted for future workers’ compensation claim payments.