World’s largest miner BHP Billiton (ASX, NYSE:BHP) (LON:BLT) has made a bold bet on copper and it’s starting by finding a way to boost output for the red metal from its Olympic Dam, Australia’s biggest underground mine, even before a proposed and long-awaited mega-expansion of the operation takes place.

While the company will take another three years before deciding if heap leaching technology will ultimately allow a big expansion of the mine, the fifth largest copper deposit in the world, and the No.1 uranium deposit, BHP wants to up output for the industrial metal from the mine by 40% over the next year.

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