NEW YORK (TheStreet) -- Rio Tinto (RTP) is expanding two of its mines in Australia, yet another indication that a mining tax widely feared three months ago has all but evaporated in the wake of a political shakeup Down Under.Rio Tinto said this week that it will invest more than $800 million to expand its Argyle diamond mine in the state of Western Australia. It's also awaiting word on whether the state government of Queensland will approve the expansion of a bauxite coal mine, called Weipa, which would include the construction of a new port and two processing facilities.
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