Couple points jumped out: previous 4C mentioned $5million for the final payment for the mine this past quarter, so I would exclude that given its a once off. But yes still an outflow from a cashflow perspective.
Also I think you have over estimated costs. The $145 estimate from the 16 August presentation is FOB which I understand to mean per tonne of saleable coal, rather than ROM. https://en.wikipedia.org/wiki/FOB_(shipping).
Would be good to get more info on how costs are tracking and estimates for the future. The IPO predicted them to be much lower but as you say its ramping up.
