Handwritten clues left by Leif's late father help the Mooka Boys hunt for an abandoned mine. The Blacklighters battle choking dust on their dry claim. The Tarantos make emergency repairs on their bulldozer.

The Bushmen gamble the last of their cash on a 50-year-old exploration rig. The Cheals, desperate for a big opal find, close in on a promising pocket against turbulent weather. The Mooka boys battle scorpions to reach an abandoned mine in uninhabited and hostile terrain.