Hallador Energy Co. unit Sunrise Coal LLC temporarily idled production at its Carlisle coal mine in Sullivan County, Ind., citing weak market conditions that led to oversupply in the domestic market.

The move led to the dismissal of 90 full-time employees, according to a Jan. 20 release.

The company said it will shift production to its lower-cost operations at Oaktown, Ind., while slashing its 2020 sales guidance to 7.0 million tons from the 8.2 Mt guided in March 2019.

Hallador said any impairment as a result of Carlisle's suspension is being assessed and will be included in its annual earnings report, slated for release in early March.