Starting to get silly here
Take off production cost. $386 - $85 take off $41 for shipping === USD 260 margin === AUD 361 margin.
Let us say a miserable million tonnes 2022 (predicted 1.6 million) === AUD 361 million profit from BBM production.

COKING COAL DAILY: Prices strong in China amid supply tightness

Seaborne coking coal prices maintained their upward trend in the cfr China market amid continuous supply tightness on Tuesday August 24. The fob market increased amid stable buying interest, sources said.

Fastmarkets indices
Premium hard coking coal, cfr Jingtang: $386.83 per tonne, up $5.10 per tonne
Hard coking coal, cfr Jingtang: $356.68 per tonne, up $3.78 per tonne
Premium hard coking coal, fob DBCT: $234.09 per tonne, up $6.34 per tonne
Hard coking coal, fob DBCT: $200.91 per tonne, up $2 per tonne