As sinkholes appear in Ballarat, experts warn of unmapped gold rush shafts hidden from detection abc.net.au - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from abc.net.au Daily Mail and Mail on Sunday newspapers.
Sinkholes close to Ballarat primary school raise concerns, geologists say historic goldmine the cause abc.net.au - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from abc.net.au Daily Mail and Mail on Sunday newspapers.