your right, it's not uncommon to join mines. for instance appin and douglas are now one pit. the name kemira came about when mt kembla mine and mt keira mine joined together.
yeah NRE own south bulli and wongawilli (west dapto way), but it's not possible to join them. the land has been rehabilitated and has been closed for many years. kemira has been sealed and there is no pittop left at all. even just to look inside would be a massive audeal as all the portals and shafts have been sealed and the place is probably full of either gas or water.
anyway back to the issue at hand, i wouldn't panic too much just yet
yeah NRE own south bulli and wongawilli (west dapto way), but it's not possible to join them. the land has been rehabilitated and has been closed for many years. kemira has been sealed and there is no pittop left at all. even just to look inside would be a massive audeal as all the portals and shafts have been sealed and the place is probably full of either gas or water.
anyway back to the issue at hand, i wouldn't panic too much just yet