Geophysical exploration for iron ore in the Middleback …
Australia's principal source of iron ore. BHP began mining high-grade iron ore at the turn of the 19th century and to date approximately 200 Mt of iron ore have been extracted, mainly to feed the nearby smelter at Whyalla. In 2000, mining operations were transferred to OneSteel Ltd, who continue to mine and produce steel from the region.
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