Walker Brothers Quarries	Georgian Aggregates
Vineland Quarries and Crushed Stone	Duntroon Quarry
Ridgemount Quarries	Orillia (Severn) Quarry
Spring Creek Aggregates	Edgar Pit
Norjohn Contracting	Georgian Construction
Walker Brothers Asphalt	Duntroon Asphalt Plant
	Hanover Asphalt Plant