After a near-catastrophic cave-in at Shane Dohnt's crocoite mine, Kyle Archer and his team must work an abandoned drive reclaimed by rainforest, while Frankie and Ebriony's grassland garnet expedition is cut short by bushfires. Their second sapphire mine still offline, The Rubyvale Boys send Shayne underground for any hope of reaching season target.

Amidst season-ending rain, Jarrin and Hugh hunt for anything and everything in the walls of their tired mine, while Patrick Gundersen's hopes of hitting season target lie within a massive column of potentially crystal-bearing rock. Desperate for cash, The Neils return to ‘Topaz Mountain', risking life and limb against deadly boulders.