Abstract: The screening assembly includes a tilted upwardly movable belt conveyor over which is mounted a rotatable cylindrical drum axially oriented in the direction of the belt conveyor. A mixed soil receiving bucket mounted over the conveyor upstream of the cylindrical drum. The bucket is also transports a mixture of soil and debris towards the cylindrical drum. The cylindrical drum while rotating allows the soil to drop on the belt conveyor while the debris are rejected at the lower end of the drum. The assembly particularly makes use of a screening drum which includes a cylindrical meshed screen supported by two end rings at both ends of the meshed screen. The drum is rotated by a pair of driving wheels located under each of the rings. One of the rings includes an outer radial flange which is adapted to abut on a pair of wheels for preventing the tilted drum from sliding downwardly.