Sometimes it may remove items with mediocre rather than very low Long Term Importance as well, if it judges they can easily be regenerated via inference from other items in memory.
When items are removed, they may be deleted irretrievably, or they may be stored on disk (i.e. in Very Long Term Memory).
Mind Ontology Links
Supercategory: MindOntology:Concretely Implemented OpenCog Structure