Mosman revealed the STP-EPA-0071 application had failed to meet requirements related to the Native Title Act which deal with heritage clearance, land access and other traditional land owner issues.

As a result, Mosman said it would now withdraw from the application and seek to cancel its 25% involvement in the project.

"It is very disappointing that the joint venture parties have not been able to secure the title after over two years of negotiations but, given market conditions, Mosman's primary focus remains making progress on its core assets in its portfolio and in other advanced project opportunities,” Mosman executive chairman John W Barr said.