If there was some way mining could use an SBAS/WAAS to reduce costs of running mines (a hot topic at the moment) this would be a powerful ally to have in the advocacy for Australia implementing a SBAS/WAAS.
Having done a short stint at BHP a few years ago, I can assure you they are not waiting for anyone. The plan is to survey their own locations around the mine, get off-the-shelf GBAS equipment and get on with it.
Probably costs them a couple of million, but as they are saving millions each year by using autonomous vehicles, it's a no-brainer.