Season 4

1. Episode 1

In Mintabie, South Australia, The Tunnel Rats are under extra pressure as rival miners close in on their claim. In Sheepyards, NSW, The Bushmen must brave an abandoned mine to remove a dead animal. Meanwhile, rookie prospectors The Poms seek a prize opal to kickstart their mining career.

2020-02-06 • 45 min

2. Episode 2

The Bushmen face off against a miner who has illegally dug on their claim.

2020-02-13 • 45 min

3. Episode 3

The Tunnel Rats deal with an unexploded bomb and hazardous gases; The Bros attempt to fit their equipment into a new mine; The Poms make their first trip underground.

2020-02-20 • 45 min

4. Episode 4

In Opalton, Boulder Boys Aaron and Ron's excavator has a close call.

2020-02-27 • 45 min

5. Episode 5

The Bushmen take a big risk, trying out a new mining method deep below the ground, and injury slows down progress for The Bros and The Poms are struggling to find their first piece of opal.

2020-03-05 • 45 min

6. Episode 6

The Boulder Boys, who are within reach of their $100,000 season target, chase old leads that could see them strike it rich and The Bushmen face a disaster underground.

2020-03-12 • 45 min

7. Episode 7

A violent summer storm sees The Young Guns race to save their only claim from a flood; meanwhile The McFarlanes must build a drill from spare parts.

2020-03-19 • 45 min

8. Episode 8

Tunnel Rats Bayden Pearse and Leese Grobe get the lifeline they desperately need. Meanwhile, Pete Cooke and Sam Westra are on the last dig of their season, and 20-year-old Sam must decide whether to quit opal mining for good.

2020-03-26 • 45 min

9. Episode 9

The Australian outback's wildest treasure hunters face even bigger challenges in their quest to strike it rich, as they seek the legendary queen of gems: the opal.

2020-04-02 • 45 min

10. Episode 10

Following six teams across Australia as they search for the country's most iconic gemstone.

2020-04-09 • 45 min

11. Episode 11

2020-04-16 • 45 min

12. Episode 12

2020-04-23 • 45 min