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In page South Australia:

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The Olympic Dam mine near Roxby Downs in northern South Australia is the largest deposit of uranium in the world, possessing more than a third of the world's low-cost recoverable reserves and 70% of Australia's. The mine, owned and operated by BHP Billiton, presently accounts for 9% of global uranium production.[1][2] The Olympic Dam mine is also the world's fourth-largest remaining copper deposit, and the world's fifth largest gold deposit.[3] There was a proposal to vastly expand the operations of the mine, making it the largest open-cut mine in the world,[4] but in 2012 the BHP Billiton board decided not to go ahead with it at that time due to then lower commodity prices.[5]