The last time Rio Tinto and Glencore were caught in merger talks, it was all about iron ore. Australia, and the Pilbara, were at the heart of it. A decade later, it can only be about copper: copper, copper and more copper. Big miners globally want more copper.
Glencore produces 1 million tonnes a year, Rio Tinto 800,000 tonnes. Combining the two would give a new owner 7 per cent of global supply.