Interacting with the dune fractures grants players Runecrafting or Mining experience. Free players are able to redeem bonus experience in these two skills, but only from sand dunes. There are two types of dunes: A large dune, found north of the Lumbridge Crater, and small dunes, found at various places throughout Gielinor. Small dunes give 20% more experience than large dunes. However, their locations vary every 15 minutes while the large dune is always found near the Lumbridge Crater. This uses bonus experience, even in free servers, unless the player is in Ironman Mode.