From the ABC:
The Nationals’ proposed tax increase on the two biggest iron ore miners would pose sovereign risk issues, WA’s State Development Minister says, as Labor continues to seek to drive a wedge between the two government alliance parties.
The Minister, Bill Marmion, said any changes to state agreements that were not made cooperatively would pose sovereign risk concerns, in response to questions about the Nationals’ proposal to increase the production levy on BHP Billiton and Rio Tinto.