its by the road near the bottom of the island,south,
there is no metal but there is a treasure map in the ground
i know linberck says that there is but trust me there isn't
you collect the rare materials first and go see zuaz ISLE ABOVE THE ISLE OF GUST
OK. The first time its an hourglass* and the second it is the tri-force**. *You know! A figure 8 with triangles instead of Os. **A large triangle with a smaller upside down triangle inside. (pic in Zauz's house; on a hidden island NW of bannan island) In return 4 this answer, if u r on the 1st time try writing #2 on the door.
Zauz is a blacksmith just south of the Isle of Gust if you met him before finishing the ghost ship then learn this. you are going to have to visit him again and ummm do something with him no he`s not just a dumb old guy after completing the ghost ship sail south of the isle of gust and after a little conversation you`ll be kissing the game card for something but right now you should focus on saving tetra and being done with the ghost ship eventually youll find out.