Mountains of slag all over the world are a Kiwi company’s idea of great riches.

The waste from mines is dumped into mounds so big that they can generate their own weather patterns — but New Zealand company Avertana says they can each be worth half a billion dollars.

Avertana is a start-up company that has received a kickstart from a new fund set up by The Icehouse innovation hub and its investors ICE Angels.

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