Patrick Gundersen confronts over forty degrees Celsius temperatures to recover Australia's biggest ever, million-dollar Amethyst cluster as the Rockhounds also face searing tropical heat while in stark contrast, Pete and Kyle struggle in frigid conditions to extract a hundred-thousand-dollar Crocoite crystal.

Hugh and Jarrin need an eleventh-hour miracle to keep their mining operation alive, Patrick and Kirsty are desperate for an $80,000 payday of high-grade crystals while veteran prospector Terry sets up a makeshift forge and overcomes extreme temperatures in his hunt for the oldest mineral on earth.