A Vertical Blender consists of a cone-shaped vessel and a screw auger agitator that rotates while orbiting around the vessel’s perimeter. The auger gently lifts batch material upward as it turns on its axis while the orbital arm slowly moves it around the vessel. Materials in the upper most level gradually cascade back down into the region opposite the moving screw. Because of the geometry of the cone, a Ross Vertical Blender can operate efficiently with batches as small as 10% of the maximum working capacity, and allows for complete discharge of the blended material.