Over a period of some years, there has been confirmation of some 50M tonnes of bauxite in the Taralga and Mt Rae areas
http://www.australianbauxite.com.au/site_folders/232/File/ASX%20Releases/30%20metres%20True%20Thickness%20Bauxite%20confirmed%20at%20Taralga%20NSW.pdf
If mined, it would be railed to Port Kembla for export. Presumably, parts of the old Crookwell branch might be rebuilt. I don't know how the Wollondilly River bridge might fare with 25t axle loads though...! Has anyone more recent information on this project, as some announcements and comments do seem to stretch back some time.