Goldman Sachs predicts "structural bull market" for commodities similar to 2000s as rising demand, green energy investment combine with chronic undersupply.

They have set up a special committee to conduct an independent review into the project's cost overruns and delays.

On the Comex market, copper for delivery in December gained 2.85% to $3.4040 a pound ($7,488 a tonne) by mid-afternoon in New York.