Offloading apparatus (30) for a composting cage comprising an enclosure (10), which maybe divided into a plurality of compartments, for receipt of material to be composted is mounted below the enclosure (10) and is capable of travelling there below in order to extract compost from the base of the enclosure. The offloading apparatus (30) comprises an elongate cutter (40) in the form of a motor driven endless chain on which cutting teeth (42) are mounted, and respective winch assemblies (50) mounted adjacent each side of the enclosure (10). Each winch assembly (50) comprises a motor driven winch (54), a pulley (56) mounted to an adjustable tensioning assembly (58) at a spacing from the winch (54), and a winch cable (51) extending from the winch (54) around the pulley (56) and back again to the winch (54). The cutter (40) extends below the enclosure (10) between the respective winch assemblies (50) in such a manner as to be movable by said winch assembles (50) in a direction substantially perpendicular to its own elongate axis.