A $100 million expansion of Australia's deepest gold mine is nearing completion, as the precious metal continues to trade at record levels. The project to extend the life of the Gwalia underground mine in Western Australia's northern Goldfields has been ongoing since 2017. Kilometres of new ventilation have been installed by sinking large new shafts to send chilled air from the surface to the miners working below. Craig Jetson, managing director of Melbourne-based gold miner St Barbara, said the final ventilation shaft should be completed next month. The shaft has reached a depth of 480 metres and has another 37 ... (full story)