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What's your favourite metal?

At the end of a radio discussion about ‘critical’ metals a while back, I was asked to name my favourite metal.

What's your favourite metal? What's your favourite metal? What's your favourite metal? What's your favourite metal? What's your favourite metal?

Commentators seem obsessed with the next hot commodity, rather than what offers sustained value over the cycle

Unprepared for the question, I nominated cobalt, and explained that it was the challenge to global supplies of cobalt resulting from the invasion of the Shaba Province in Zaire (now Katanga in D...