Deep underground in the South Australian outback beneath an arid orange-dirt plain speckled with saltbush, lies an enormous mass of copper.

It’s shaped a bit like a giant carrot and is one of the largest undeveloped deposits of the precious metal in Australia. Think of all the copper pots and pans, hanging lamps, wiring and pipes that could be made if the ore was mined, processed and sold. Oz Minerals plans…