Mining firms tap renewable energy to extract gold, gems

Posted: December 10, 2012 at 2:32 a.m.

The four windmills dug into northern Canada’s tundra that power Rio Tinto’s $5.2 billion Diavik diamond mine are the world’s first designed to work in gusts as cold as 40 degrees below zero.

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Business, Pages 12 on 12/10/2012