The Tiberium Refinery is a GDI facility that refines harvested Tiberium and processes it into credits. Each new refinery comes with a Harvester, which automatically begins harvesting from the nearest Tiberium field.
The refinery converts the Harvester's loads of Tiberium into credits for the player. It also stores a certain amount of Tiberium. Once a refinery is full, silos must be created in order to store excess Tiberium. If there is no available storage capacity at a refinery or silos, the excess Tiberium will be lost.