Rune essence mine

Rune essence mine is a place where Rune essence can be mined. The members' version of the rune essence called Pure essence can also be traded in free-to-play. The mine is discovered during Rune Mysteries quest and can be reached by talking to NPCs who know the right teleportation spell.

Entering
The two NPCs who know the spell are Aubury in east Varrock and a mage in the Wizards' Tower.