With the team's time in New Zealand running out, Kate offers the team some extra gold to help them make their jewelery. But it's buried somewhere on a nearby mountainside - so the scientists will need cunning to work out exactly where. Meanwhile Kathy searches for gold on a beach, and the two Mikes work out how to extract the gold from rocks collected earlier in the series.
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Ready to Watch Rough Science, Season 3, Episode 5?