With 50% royalty rebate (reported to be worth $2.5/t) and diesel price plunging further since Nov and freight rate dropping dramatically, it looks like AGO may be able to get all in cost (before interest, taxes and depreciation) to about $AUD 61 / tonne.
It looks like AGO is receiving about $AUD 65/tonne when 62% Fe spot is $us 68 or $aud 83.5.