Take not just Chile, with its revisions to fiscal policies for miners, but Peru, a country long considered crucial to the next wave of copper production, where the mining sector has been battered during lengthy social unrest. Rio in late March agreed to sell a controlling stake in its Peruvian mine La Granja to First Quantum.

“What the market never predicted was how difficult South America would become,” said Radclyffe. “The uncertainty out of both Chile and now ongoing in Peru, that’s just added an extra level of complexity that the market never expected, and that hasn’t really been resolved.”

Eoin Treacy's view

The classic basis for a big bull market in commodities is supply inelasticity meets rising demand.

The promise of a big bull market in copper is heavy on the supply inelasticity argument. I think everyone understands, there is limited supply and sufficient increases to meet the expected demand from renewables is not feasible.