MGX peer comparison, page-3

I have compiled a peer comparison as follows:


I have gone through last five year announcements for MGX, couldn't find separate cash unit cost for Extension Hill mine, only see "low cost", "strong cash generator". That will be much appreciated If anyone can provide the cash unit cost for Extension Hill mine.
Per the 2014 annual report, MGX paid $22m for the 2013 income tax and $32.9m income PAYG instalments for the 2014 financial year ($32.9m should be for the Three PAYG instalment), So, there was approx. $11m income tax PAYG instalment for the June 2014 quarter paid by 28 July 2014, which should be refundable. (because there was $10m income tax refundable on the 2014 Balance Sheet). I reasonably guess there was one PAYG instalment for September 2014 quarter, as Iron ore spot price mainly plummet started October 2014. Therefore, there would be totaling $32m income tax refundable.