The Bristol-based coal operator says the closures of deep mines 44, 37 and 25 will affect 96 employees.
Alpha says it also will reduce operations at deep mines 41 and 26 in Dickenson County.
Alpha subsidiary Paramount Coal Company operates all five mines.
Multiple media outlets report that Alpha announced the cuts on Monday. The company attributed the decision to the supply of coal exceeding demand.
Alpha filed for Chapter 11 bankruptcy on Aug. 3.