Facthunter - do you mean airleg mining? I don't have current stats for airleg mining. But mining is one of Australia's safest industries., has been for a couple of decades.
OME - Re the geology - the rock at Ballarat is Ordovician sediment. It is slates, shales and sandstone, but quite strongly weathered to weaken it. There are many faults, some known as "leatherjackets" because they look like leather. The rock is weak and broken compared to most of the mines I have worked on, even others in Central Victoria. It would not be safe to stand under unsupported ground, so the miners work forward putting in rockbolts and mesh from a safe position. That is, you stand under the mesh while boring the rockbolt holes and installing the mesh out ahead. It is a highly skilled business.