Alpha Metallurgical Resources (AMR) reported a Q1 loss Friday of $2.60 per diluted share, swinging from net income of $9.59 a year earlier.
One analyst polled by FactSet expected a loss of $0.59.
Revenue for the quarter ended March 31 was $532.0 million, down from $864.1 million a year earlier.
Two analysts surveyed by FactSet expected $573.2 million.
Shares of the coal producer were down more than 8% in recent premarket activity.
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