Some interesting articles. The tax effect is not being felt only in Carpentaria-land:
http://www.abc.net.au/news/stories/2010/05/04/2890119.htm
http://au.news.yahoo.com/thewest/a/-/mp/7160141/tax-gives-rio-get-out-clause/
http://www.brisbanetimes.com.au/national/miner-shifts-to-africa-ahead-of-new-tax-20100504-u6r4.html