If TIG intends to mine 750K ton for 2019 calendar year then it...

If TIG intends to mine 750K ton for 2019 calendar year then it should have at least that much of saleable coal at the port for this shipping season because TIG had 200K ton stockpiled at the port & 67K ton stockpiled at mine ( total 267K ton) at 31st Dec 2018.
IMO, these 2 x 500 ton barges should take 2019 sales  close on 700K ton..
agent's suggestion of a floating platform seems an excellent solution  to  lifting sales to 2 mil t/p/a at affordable capex.

The quickest strategy for opening up Aamam to 10 mil t/p/a would be a Chinese 50/50 JV IMO. The Chinese are capable of building the 12 mos port and railway within 2 years Once this is up and going a 50% TIG interest would yield. 5 mil ton p/a @ say $80 npat/ton would be $400 mil or a share value of $2.20 at a P/E of 10.

We have 17 trucks capable of delivering 60K ton/mo working one shift to the port.
This could double by working 2 shifts to 120K ton/mo.
3 axle dog trailers fitted to each unit could lift that by 60% (1.92 mil T/P/A) 

The cost of these trailers complete with Scania fitting kits (hydraulics to real & towbars & electrics) is about $70K FOB Brisbane (no GST)
or $1.19 mil AUD for the 17 units.