The firm is reviewing data on the mine in the Surat Basin of southeast Queensland state ahead of a deadline for non-binding, preliminary offers on 23 April.
Wilkie Creek produces around 2 million metric tons of thermal coal for export to Asia annually and has a resource of more than 500 million tons.
An information memorandum on the coal mine was sent to potential bidders late last month.
Peabody hired UBS earlier this year to advise on the sale of Wilkie Creek, which it considers to be non-core following its A$4.9bn ($5.09bn)acquisition of Macarthur Coal last year.
