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Why process one million tonnes of rock to make just 3.8 kilos of iridium?

Michael Allan McCrae | August 03, 2013 | 6:00 pm Precious Metals Gold 

Professor Martyn Poliakoff, host of the excellent series Periodic Table of Videos, is still in the Johnson Matthey labs and this time showing off a 3.8 kilogram iridium bar. "Iridium is the densest metal that exists. It has one of...

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