It is believed Enex is currently preparing its float and a prospectus will hit the market in the first half of August.
Analysts working on the Glencore IPO include ABN Amro, Rothschild, Salomon Smith Barney and JP Morgan.
Formally Glencore Coal Holdings, the company has an interest in 11 operating coalmines and was Australia's second largest thermal coal producer in 2000, producing 12% of the nation's exported coal.
It is believed Glencore International plans to sell 60-70% of Enex, maintaining a majority interest in the coalminer.
Analysts have suggested Glencore will have little difficulty raising the funds given the current sentiment in Australia for energy stocks, with Macarthur Coal recently listing at a 39% premium.