Harbour indicated the latest offer would be funded by $7.75 billion of debt to be underwritten by JPMorgan Chase and Morgan Stanley, with the balance in equity from Harbour, other EIG managed funds and Mercuria Global Energy.
BHP and Esso Australia each hold a 50 percent share.
The financing delay is the latest hurdle for Adani, adding pressure to its ambition to deliver the first coal production from the mine by 2020.
Snowy Hydro has begun talks with global infrastructure funds and banks over financing options.
By buying Exxon’s stake Woodside will control 75 percent of a permit containing the majority of the Scarborough gas field.
The company is seeking A$2 billion to A$3 billion from lenders, including from banks in China, for the first phase of developing the Carmichael mine.
Mineral Resources said the acquisition would fit with its strategy of securing gas assets.
The challenge may be another setback for Glencore’s ambitions to control Rio’s assets