One of the floors in Semitt Falls has a stone room where workers from the nearby town of Salamand are kept prisoner by Palamecia. The thief Paul explains their plight and how they, along with Josef's daughter Nelly, were forced to mine Semitt Falls for Mythril. The slaves, including Nelly, are released by Firion and return to Salamand. Firion and his allies venture further within the cave to defeat the Sergeant and retrieve the Mythril.
The Semitt Falls is mentioned as one of the wonders in Final Fantasy Tactics. It bears the following description:
A site of significance for the ancient Palamecian Empire. Mythril was mined beneath these majestic falls, while extacium—a fuel used by the airships of the day—could be gleaned from their magickal waters.