It expects to fetch between $755 million to $1.1 billion for the nine trains, which carry coal from mines in NSW to port operations on Australia's eastern seaboard.
Chinese import price for 62% iron content fines at the port of Qinqdao rose 6.7% to $59.38 a tonne, the largest one-day percentage increase since April 21.
The company said financial losses at the mine threaten the viability of the rest of the Cooke operations, which include four mines and three processing plants.