Abstract: An aggregate material processing plant (1) has an input hopper (5) communicating with a screen box (8) which provides three material separations. The finest material is delivered through a longitudinal conveyor (11). The two other grades are delivered to hoppers (12) (13) which feed lateral conveyors (20). Each lateral conveyor (20) has a head section (22) which pivots relative to a tail section (21) about an axis which is perpendicular to the plane of the conveyor belt (27). In addition, part of the tail section (21) pivots about an axis which extends longitudinally so that whole conveyor can be mounted in the transport position within the lateral confines of the chassis and the height of other parts of the plant.