Ramaco Resources (METC) reported a Q1 loss late Monday of $0.30 per class A diluted share, widening from the loss of $0.19 a year earlier.
Analysts polled by FactSet expected a loss of $0.21.
Revenue for the three months ended March 31 fell to $121.6 million from $134.7 million a year earlier.
Analysts surveyed by FactSet expected $129.7 million.
Shares of Ramaco Resources were down nearly 7% in after-hours trading.