In the season premiere, Freddy and Juan face off at a hard rock mine spanning three elevations at 4,000 feet in the Cascades. Battling impenetrable rock, the guys devise an innovative 180-foot chute featuring a spiral concentrator in their first-ever Washington state rescue. 

When Freddy and Juan get an SOS from an Oregon couple's mine, they must unravel an underground mystery buried beneath a dried riverbed. Facing misleading dredge tailings and a faulty homemade wash plant, the guys call in all-new tech as a final hope.