(2ND OF 2 FIRES - 1ST FIRE ON 2/4/06.) Contractor baling hay in reclaimed area E. Apparent mechanical failure on hay baler 567 resulted in an overheating condition which ignited grass. Fire consumed 7.35 acres of reclaimed vegetation with total burn time of 1.5 hours. Extinguished by mine fire brigade and SMEC power plant fire brigade.