Pallet accumulation conveyors are powered through a mechanical clutch. Common applications include farm equipment, winches, sheaves, conveyors, and pulleys. They are also used around the farmyard to run chippers, grain augers, and conveyors. Receptacles may be as simple as chutes, or gravity conveyors, or powered conveyors. Large, heavy loads are moved by chain driven live roller conveyors. Mining at this scale requires the use of draglines, trucks, conveyors, hydraulic jacks and shearers. Silos can be unloaded into rail cars, trucks or conveyors. Containers handled by means of lifting gear, such as cranes, overhead conveyors, etc. Many of the heavy duty roller conveyors can move as fast as . Vertical lift conveyors can be manually or automatically loaded and controlled. Vertical reciprocating conveyors (or VRC) are another type of unit handling system. "Nassau" had 1,400 compartments, nine elevators and two horizontal conveyors. All other machines can operate faster and are connected by conveyors. Some dredges also self-offload using drag buckets and conveyors. The oranges then go through roller conveyors, which expose all sides of the fruit.