Hey just starting. On the earth resources website page that links to GeoVic 3 there is a link to a help sheet that has good help for it. I do know that it is the middle dropdown tab on top of the left column where the visible features are displayed. The overlay I use is labelled gold prospecting...
GeoVic website by the government is really good for finding shafts, particularly in Ballarat where most have been documented. All of the open shafts and adits etc at Black Hill are on there to the exact location.