Charting the journeys of entrepreneur Todd Hoffma, gold-mining prodigy Parker Schnabel and "King of the Klondike" Tony Beets as they embark on their gold-mining seasons.

It's a new season for the gold miners of the Yukon, and Rick Ness has parted ways with former boss Parker Schnabel, setting up his own mining outfit.

The pressure is on for the miners, as a slow start to the season is compounded by a host of mechanical problems. Tony continues to make life difficult for Parker.

Disaster strikes when Rick fires up his wash plant for the first time; Parker tries a risky plan, and he must choose a new foreman to replace Rick; Tony must transport his tug Kid Commando to the dock for a crucial stability test.

Rick drafts a Gold Rush vet and former member of team Hoffman to save his season. Tony and Monica fire up their wash plant as they start to battle Parker to beat him to the gold.

New mine boss Rick is buckling under debt and if he's going to prove himself to his crew he needs to get his first gold weigh; Parker attempts a treacherous river crossing; Tony Beets hits a snag removing a massive piece of his dredge.

Parker hires a new driver that isn't as experienced as he claims. Elsewhere, one of Tony's dredges sinks into a pond, and he clashes with son Kevin over how to rescue it.

Heavy rainfall for several days causes problems for Parker and Rick. Elsewhere, Tony's second dredge upriver proves more difficult than expected.

Rick Ness and his father, Rick Senior, battle together to open a new cut; Parker struggles with mechanical breakdowns, and a crew member suffers a terrible injury; Tony races to dismantle the final sections of his million-dollar dredge.

The flu brings Parker's operation to its knees, and it's up to foreman Dean to keep the claim running; Rick's mechanic, Carl, behaves strangely and reveals shocking news; Tony hits rock bottom as his entire operation grinds to a halt.

Rick is forced to ask Tony for help. Parker runs a 24-hour test of his ground and suffers another washplant failure. Tony hauls the final piece of his million-dollar second dredge from Thistle Creek and prepares to rebuild it.

Rick discovers he's been losing gold after Freddy Dodge points out a major flaw in his wash plant; with his excavator down, Parker risks moving his wash plant with a dozer.

Parker leaves Brennan in charge of one section of the mine, with mixed results; Rick damages his water pipe with some careless excavation work.

The Beets family celebrates as Monica gets married; while Tony is happy for his daughter, he is also stressed to be taking time off while behind on his gold target.Zee has kidney stones and goes to Fairbanks.

Parker and Mitch go for a boat ride that results in Mitch getting injured. With the parts of the second dredge finally in position, Tony has problems reconstructing it.

Experts step in to help the miners of Gold Rush with technology, ingenuity and mechanical innovation to find the most prized element in human history.

Tony and his family attempt a dangerous crane operation. Rick fights frozen ground to keep his season alive and Parker, in a desperate bid to get every last ounce of gold from his ground, pushes wash plant Sluicifer beyond the limit.

In an attempt to get dredge two running before the end of season, Tony shuts down dredge one. Brennan takes a risk and keeps Big Red running after signs of damage.

Parker's parents visit and offer help; Rick continues to battle frozen ground to reach his goal; shocking news forces Tony to make a drastic decision about his season.

Winter has arrived, shutting down Rick's sprinkler system and leaving his cut frozen. Elsewhere, moving Big Red to the new pay dirt he discovered proves a difficult job for Parker.

Rick desperately tries to get the last 27 ounces he needs to hit his target. Meanwhile, Tony finds out his dredge is short 30 buckets.