"This is of far greater significance than super-rich miners (the majority of whose profits go overseas anyway"
WRONG!!!!!!!
Although lots of dividends do go overseas to RIO and BHP foreign shareholders, these companies create so much spin-off wealth, jobs and money we should be CUTTING tax on the sector not increasing it.
You already own a part of them, as nearly every superannution fund would have shares in the big miners.
Mr Swan predicts 9 billion a year in extra tax. That's assuming prices stay high, which they won't. Not forever.