The Yuna Bore mine was once known for two strange treasures: Quesh venom and bones. The first miners found a fossil bed containing remains of Quesh's prehistoric creatures, preserved by rising silt and venom deposits after the big Quake. Since the Republic was only interested in the Quesh venom, the miners were free to recover the bones, ship them offworld and sell them to collectors and paleontologists on Coruscant.
This turned out to be immensely profitable. Many miners were able to buy out their contracts on profits from the fossils alone. Even today, with the fossil bed cleared, the Yuna Bore remains productive, as the miners' attempts to discover more bones have driven the tunnels on well ahead of schedule.