New Zealand used to be full of gold, but it was thought that miners had cleared it out years ago.
The Central Otago hills are teeming with it. It's like playing Lotto, except for free. All you need is time, and a pan of course.
Some places used to not be economic to mine, but that has changed with modern technology.
Watch the Seven Sharp report above to find out how a once-dead industry has come back to life.