Not all anodes sent to the refinery are able to be refined due mainly to improperly balanced chemical makeup. When one is found it is returned to the smelter to be reprocessed in a relatively small shaft furnace for recycling along with spent anodes (image 245). Kennecott is constantly looking for more efficient methods to draw as much out of the value stream as possible. Approximately 99.96% of the value in the raw ore is extracted and becomes part of a revenue generating end product.