Coal miner cited the subdued met coal market as reason for the decision.
US miner cited "especially adverse market conditions" as the reason for decisions for both mines.
Shutdown due to COVID-19 had been ongoing since late March.
Coal industry slump cited for regional OEM closure
Agency data shows 42% reduction in employment since 2011
New West Virginia mine should be online in 2021
Leer South in West Virginia, US, to be near-twin of existing Leer longwall operation