1. 80% foreign owned is completely wrong. It's not that high at all. In any respect, all companies in Australia pay the Australian company tax rate on profits from their operations here. Sure, some use transfer pricing & offshore accounts to minimise tax but the big mining companies still pay a lot of tax. So does Woolies, Coles, the banks etc.
2. Do you think it's purely the mining export boom that is causing the AUD to be so high? Don't think rampant money printing by the US and Euro central banks has anything to do with it? Currency peg by China and other developed countries?
Open your eyes a bit. Don't swallow the ALP line, or the LNP line for that matter. Work it out for yourself.